Filter batch test fixture based on omnidirectional soft positioning

Abstract

This invention discloses a filter batch testing fixture based on omnidirectional soft positioning, belonging to the field of filter manufacturing technology. The filter housing has outwardly protruding mounting ears at both ends of its bottom. The filter batch testing fixture includes a base plate, a middle plate, a top plate, a first soft pad, a second soft pad, and soft washers. The base plate has multiple filter mounting positions, with multiple first soft pads placed on top of these positions. Each first soft pad has a second soft pad positioned above both ends. The middle plate has an annular mounting groove, with multiple soft washers placed within it. The top plate has an annular protrusion at its bottom, with the lower parts of the protrusions placed within the annular mounting grooves and pressing down on the corresponding soft washers. This invention achieves omnidirectional soft positioning of the filter in both vertical and circumferential directions, avoiding damage to the filter surface coating, improving product aesthetics and yield, and simultaneously increasing assembly and disassembly efficiency.

Description

Technical Field

[0001] This invention belongs to the field of filter manufacturing technology, specifically relating to a filter test fixture, and more particularly to a filter batch test fixture based on omnidirectional soft positioning. Background Technology

[0002] Filters are used to filter electrical signals and are widely used in various electronic devices. Because they are often used in environments with high temperatures and vibrations, the performance requirements for these products are high, so multiple tests are conducted before they leave the factory. Figure 1 As shown, a common filter has two ends of the bottom of the filter housing 4 that protrude outward to form mounting ears 1. The mounting ears 1 are provided with filter mounting through holes 2. The outer ends of multiple pins 3 are located at the upper end of the filter housing 4. Both the filter housing 4 and the mounting ears 1 are metal and their surfaces are plated with nickel.

[0003] During testing, the filter housing 4 is first installed on the test plate, and then the test plate is installed on the test equipment (such as vibration equipment). The traditional way to install the filter housing 4 on the test plate is to fix the mounting ear plate 1 to the test plate by passing multiple screws (usually four) through multiple filter mounting through holes 2. This traditional installation method has the following drawbacks: there is direct contact between the screws and the mounting ear plate 1, and between the mounting ear plate 1 and the test plate. During the installation and disassembly process, the surface coating of the mounting ear plate 1 and the filter housing 4 is easily scratched. Especially in vibration tests, the surface coating is more likely to be damaged, resulting in damage to the product appearance and a reduction in the pass rate. At the same time, each filter requires four screws to install. When batch testing is carried out, many screws need to be installed, and installation and disassembly require a lot of time, which is time-consuming, labor-intensive and inefficient. Summary of the Invention

[0004] The purpose of this invention is to provide a filter batch testing fixture based on omnidirectional soft positioning that does not damage the surface coating and has high assembly and disassembly efficiency in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A batch testing fixture for filters based on omnidirectional soft positioning is disclosed. The filter housing has two outwardly protruding mounting ears at its bottom ends, each with a filter mounting through-hole. The fixture includes a base plate, a middle plate, a top plate, a first soft pad, a second soft pad, and soft washers. The base plate has multiple filter mounting positions for mounting the filters. Multiple first soft pads are positioned on top of corresponding filter mounting positions and can be laterally positioned. Each first soft pad has an upwardly protruding upper positioning protrusion near both ends, corresponding to and fitting within the corresponding filter mounting through-hole. The second soft pad has the same shape as the mounting ears but is no larger. Each first soft pad has a second soft pad above both ends. The base plate has multiple vertical guide posts and multiple vertical connecting screw holes near its edge. The middle plate has multiple vertical guide posts corresponding to the multiple filter mounting positions. The middle plate has a series of through holes, each corresponding to one of the through holes through which the filter housing passes. The upper surface of the middle plate has annular mounting grooves with open tops near these through holes. Multiple annular soft washers are placed within these grooves. The middle plate has multiple vertical guide holes and connecting holes near its edge. The horizontal top plate has multiple vertical through holes, each corresponding to one of the through holes, for the filter housing to pass through. The lower surface of the top plate has downward-facing through holes near these holes. The raised annular protrusions have their lower parts placed in the annular mounting grooves and pressing down on the corresponding soft washers, allowing the inner wall of the soft washers to extend inward in a circumferential direction. The top plate has multiple vertical top plate guide holes and multiple vertical top plate connecting holes near its edge. Multiple guide posts pass through the multiple middle plate guide holes and multiple top plate guide holes sequentially from bottom to top. Multiple connecting screws pass through the multiple top plate connecting holes and multiple middle plate connecting holes sequentially from top to bottom and then connect to the multiple connecting screw holes.

[0007] Preferably, in order to achieve a better positioning effect on the outer peripheral wall of the filter housing, a positioning retaining ring protruding inward in the inner peripheral direction is provided on the inner wall of the annular protrusion near the lower end. The upper part of the soft washer near the outer peripheral edge extends inward in the inner peripheral direction and upward to form a positioning soft ring. The positioning soft ring is located above the part between the inner wall of the annular mounting groove and the hole wall of the corresponding middle plate through hole and below the positioning retaining ring.

[0008] Preferably, in order to further improve the positioning effect on the outer peripheral wall of the filter housing, the lower end of the annular protrusion is provided with a top plate annular conical surface that slopes from bottom to top and from outside to inside. The upper part of the connection between the upper surface of the soft washer and the upper surface of the positioning soft ring is the soft washer annular conical surface. The top plate annular conical surface and the soft washer annular conical surface have the same taper and are in contact with each other.

[0009] Preferably, in order to facilitate the installation of the filter and the lateral positioning of the first pad, a plurality of filter mounting positions protrude upward to form mounting bosses. The upper ends of the mounting bosses are provided with vertical positioning blind holes, and the lower part of the first pad is provided with a plurality of downwardly protruding lower positioning protrusions. The plurality of lower positioning protrusions are respectively placed in the plurality of corresponding positioning blind holes.

[0010] Preferably, in order to reliably control the compression of the first and second soft pads to achieve more reliable vertical clamping and positioning of the filter mounting ear plate, the outer peripheral edge of the base plate is provided with an upwardly protruding base plate ring. The upper surface of the base plate ring is higher than the upper surface of the mounting boss but lower than the upper surface of the first soft pad when it is in its normal state. The lower surface of the middle plate is provided with upwardly recessed inverted "L" shaped grooves near the two ends of the multiple middle plate through holes. The multiple second soft pads are respectively placed in the multiple corresponding inverted "L" shaped grooves.

[0011] Preferably, in order to ensure that the second pad does not conflict with the upper positioning protrusion when compressed, the second pad is provided with a vertical clearance hole at the position corresponding to the upper positioning protrusion.

[0012] Preferably, in order to achieve better elasticity and compression effect, both the first and second soft pads are silicone pads, and the soft pad ring is a silicone ring.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention, through the design of a base plate, middle plate, top plate, first soft pad, second soft pad, and soft washer that cooperate with each other, allows the filter to be placed on the first soft pad during use, achieving lateral positioning between the filter mounting lug and the base plate. Guide posts are used to achieve lateral positioning of the middle plate and top plate during installation, ensuring that only the first soft pad, second soft pad, and soft washer contact the filter during installation. The middle plate and base plate provide vertical positioning for the mounting lug and filter. The soft washer, by compressing the top plate, deforms inward and provides circumferential positioning for the filter. Ultimately, this invention achieves comprehensive vertical and circumferential soft positioning of the filter, avoiding damage to the filter's surface coating during installation and removal, improving product aesthetics and yield. Furthermore, because only a few connecting screws are needed to position and install multiple filters (e.g., 20), it improves installation and removal efficiency and reduces labor and time costs. Attached Figure Description

[0015] Figure 1 This is a perspective view of a filter according to the present invention;

[0016] Figure 2 This is a three-dimensional exploded view of the filter batch test fixture based on omnidirectional soft positioning described in this invention before assembly;

[0017] Figure 3 This is a three-dimensional view of the assembled filter batch test fixture based on omnidirectional soft positioning described in this invention.

[0018] Figure 4 This is a front sectional view of the assembly process when the filter batch test fixture based on omnidirectional soft positioning described in this invention is applied.

[0019] Figure 5 yes Figure 4 Enlarged image of the letter "A" in the image;

[0020] Figure 6 This is a front sectional view of the filter batch test fixture based on omnidirectional soft positioning described in this invention after assembly. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] like Figure 1 As shown, the bottom ends of the filter housing 4 of the present invention protrude outward to form mounting ears 1, and the mounting ears 1 are provided with filter mounting through holes 2, such as... Figures 2-6As shown, the filter batch testing fixture based on omnidirectional soft positioning of the present invention includes a base plate 23, a middle plate 12, a top plate 5, a first soft pad 18, a second soft pad 17, and soft washers 11. The horizontal base plate 23 has multiple (20 in the figure) filter mounting positions (refer to the mounting boss 21 below) for mounting the filters. Multiple horizontal first soft pads 18 are respectively placed on top of the corresponding filter mounting positions and can be laterally positioned. The upper surface of the first soft pads 18 has upwardly protruding upper positioning protrusions 19 near both ends. The multiple upper positioning protrusions 19 and multiple... Each filter mounting through hole 2 corresponds to a specific filter mounting through hole 2 and can be placed within the corresponding filter mounting through hole 2. The shape of the second horizontal soft pad 17 is consistent with that of the mounting ear plate 1 and its size is not larger than that of the mounting ear plate 1. Each first soft pad 18 has a second soft pad 17 above each of its two ends. The top of the base plate 23 has multiple (4 in the figure) vertical guide posts 25 and multiple (9 in the figure) vertical connecting screw holes 22 near the edge. The horizontal middle plate 12 has multiple (20 in the figure) vertical middle plate through holes 16 that correspond one-to-one with the multiple filter mounting positions and are used for the filter housing 4 to pass through. On the upper part of plate 12, near the multiple middle plate through holes 16, there are annular mounting grooves 14 with open tops. Multiple annular soft washers 11 are placed in the multiple annular mounting grooves 14. On the middle plate 12, near the edge, there are multiple (4 in the figure) vertical middle plate guide through holes 13 and multiple (9 in the figure) vertical middle plate connecting through holes 15. On the horizontal top plate 5, there are multiple (20 in the figure) vertical top plate through holes 9, which correspond one-to-one with the multiple middle plate through holes 16 and are used for the filter housing 4 to pass through. On the lower part of the top plate 5, near the multiple top plate through holes 9, there are downward protruding annular protrusions. Part 26, the lower part of multiple annular protrusions 26 are respectively placed in multiple annular mounting grooves 14 and press down the corresponding soft washers 11, allowing the inner wall of the soft washers 11 to extend inward circumferentially. The top plate 5 has multiple (4 in the figure) vertical top plate guide holes 6 and multiple (9 in the figure) vertical top plate connecting holes 8 near its edge. Multiple guide posts 25 pass through multiple middle plate guide holes 13 and multiple top plate guide holes 6 sequentially from bottom to top. Multiple connecting screws 7 pass through multiple top plate connecting holes 8 and multiple middle plate connecting holes 15 sequentially from top to bottom and then connect to multiple connecting screw holes 22. The length of the guide posts 25 is determined according to needs. The length shown in the figure is shorter, which is more convenient for experimental operation. However, in order to achieve better guidance during the installation of the middle plate 12 and the top plate 5, the length of the guide posts 25 can be increased, so that the middle plate 12 and the top plate 5 are located at... Figure 3 and Figure 6 When the filter housing 4 is positioned above the guide post 15, it is connected to ensure that it is laterally limited throughout the entire installation process of the middle plate 12 and the top plate 5, and will not come into contact with the outer wall of the filter housing 4.

[0023] like Figures 2-6 As shown, the present invention also discloses the following more optimized specific structures:

[0024] In order to achieve a better positioning effect on the outer peripheral wall of the filter housing 4, a positioning retaining ring 10 protruding inward in the inner peripheral direction is provided on the inner wall of the annular protrusion 26 near the lower end. The upper part of the soft pad 11 near the outer peripheral edge extends inward in the inner peripheral direction and upward to form a positioning soft ring 28. The positioning soft ring 28 is located above the part between the inner groove wall of the annular mounting groove 14 and the hole wall of the corresponding middle plate through hole 16 and below the positioning retaining ring 10.

[0025] To further improve the positioning effect on the outer peripheral wall of the filter housing 4, the lower end of the annular protrusion 26 is provided with a top plate annular conical surface 27 that slopes from bottom to top and from outside to inside. The upper part of the connection between the upper surface of the soft washer 11 and the upper surface of the positioning soft ring 28 is a soft washer annular conical surface 29. The top plate annular conical surface 27 and the soft washer annular conical surface 29 have the same taper and are in contact with each other.

[0026] To facilitate the installation of filters and the lateral positioning of the first pad 18, multiple filter mounting positions protrude upward to form mounting bosses 21. The upper ends of the mounting bosses 21 are provided with vertical positioning blind holes 20. The lower part of the first pad 18 is provided with multiple downward protruding lower positioning protrusions 31, which are respectively placed in the multiple corresponding positioning blind holes 20.

[0027] In order to reliably control the compression of the first soft pad 18 and the second soft pad 17 to more reliably clamp and position the mounting ear plate 1 of the filter, the outer peripheral edge of the base plate 23 is provided with an upwardly protruding base plate ring 24. The top of the base plate ring 24 is higher than the top of the mounting boss 21 and lower than the top of the first soft pad 18 when it is in its normal state. The bottom of the middle plate 12 is provided with upwardly recessed inverted "L" shaped grooves (not marked in the figure) near the two ends of the multiple middle plate through holes 16. The multiple second soft pads 17 are respectively placed in the multiple inverted "L" shaped grooves that correspond one-to-one.

[0028] To ensure that the second pad 17 does not conflict with the upper positioning protrusion 19 when compressed, a vertical clearance through hole 30 is provided on the second pad 17 at the position corresponding to the upper positioning protrusion 19.

[0029] To achieve better elasticity and compression, both the first soft pad 18 and the second soft pad 17 are silicone pads, and the soft pad ring 11 is a silicone ring.

[0030] like Figures 2-6As shown, in application, first place the base plate 23 on the worktable, then place multiple (20 in the figure) first soft pads 18 on top of multiple mounting bosses 21, and place multiple lower positioning protrusions 31 into corresponding positioning blind holes 20, thus achieving lateral positioning installation of the first soft pads 18; then place multiple (20 in the figure) filters to be tested on top of multiple first soft pads 18, and place multiple upper positioning protrusions 19 into the filter mounting through holes 2 on the mounting ear plates 1 at the bottom of the corresponding filter housing 4, thus achieving lateral positioning installation of multiple filters. Then, multiple second soft pads 17 are placed on top of multiple mounting ear plates 1; multiple soft washers 11 are placed in multiple annular mounting grooves 14; then, the middle plate 12 is placed on top of the base plate 23 from top to bottom, during which multiple guide posts 25 pass through multiple middle plate guide holes 13 from bottom to top, and multiple filter housings 4 pass through multiple middle plate through holes 16 from bottom to top. Under the action of the guide posts 25, the hole walls of the middle plate through holes 16 will not contact the outer walls of the filter housings 4; then, the top plate 5 is placed on top of the middle plate 12 from top to bottom, during which multiple guide posts 25 pass through multiple annular mounting grooves 14 from bottom to top. The filter housings 4 pass through multiple top plate guide holes 6 from bottom to top, and under the action of the guide post 25, the hole walls of the top plate through holes 9 do not contact the outer walls of the filter housings 4. The lower parts of the multiple annular protrusions 26 are respectively placed in multiple annular mounting grooves 14 and press down on the corresponding soft washers 11. Then, multiple connecting screws 7 pass through multiple top plate connecting through holes 8 and multiple middle plate connecting through holes 15 from top to bottom and are connected to multiple connecting screw holes 22. The multiple connecting screws 7 are gradually tightened. During this process, the middle plate 12 gradually presses down on the multiple mounting ear plates 1. The filter is vertically positioned by being tightly attached to the base plate 23. However, the force is transmitted through the first soft pad 18 and the second soft pad 17, so it does not directly contact the mounting ear plate 1, thus avoiding damage to the surface plating of the mounting ear plate 1. The soft washer 11 is pressed downward by the corresponding annular protrusion 26. Under the inclined contact action of the top plate annular conical surface 27 and the soft washer annular conical surface 29, and under the action of the positioning retaining ring 10, the positioning soft ring 28 of the soft washer 11 will inevitably extend inward and make close contact with the outer wall of the corresponding filter housing 4 when it is simultaneously pressed by the top plate annular conical surface 27 and the positioning retaining ring 10. Figure 6 As shown, this achieves the circumferential positioning function of multiple filter housings 4, and ultimately realizes the vertical and circumferential all-round soft positioning function of the filter. Then, the base plate 23 is installed on the test equipment, and various tests can be carried out.

[0031] When disassembling after the test, remove the top plate 5, middle plate 12 and second soft pad 17 in reverse order to remove the filter. The filter surface plating will not be damaged during the assembly and disassembly process, which improves the product's appearance and pass rate.

[0032] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A filter batch testing fixture based on omnidirectional soft positioning, wherein the bottom ends of the filter housing of the filter protrude outward to form mounting lugs, and the mounting lugs are provided with filter mounting through holes, characterized in that: The filter batch testing fixture based on omnidirectional soft positioning includes a base plate, a middle plate, a top plate, a first soft pad, a second soft pad, and soft washers. The horizontally oriented base plate has multiple filter mounting positions for installing the filters. Multiple horizontally oriented first soft pads are placed on top of corresponding filter mounting positions and can be laterally positioned. Each first soft pad has an upwardly protruding upper positioning protrusion near both ends, corresponding to and fitting into the corresponding filter mounting through holes. The shape of the horizontally oriented second soft pad is the same as the mounting ear plate, but its size is no larger. Each first soft pad has a second soft pad above both ends. The top of the base plate has multiple vertical guide posts and multiple vertical connecting screw holes near the edge. The horizontally oriented middle plate has multiple vertical through holes corresponding to the filter mounting positions and for the filter housing to pass through. The top of the middle plate has multiple vertical guide posts and connecting screw holes near the edge. The middle plate has annular mounting grooves with open tops at the positions of the through holes. Multiple annular soft washers are placed in the multiple annular mounting grooves. The middle plate has multiple vertical middle plate guide through holes and multiple vertical middle plate connecting through holes near the edge. The horizontal top plate has multiple vertical top plate through holes that correspond one-to-one with the multiple middle plate through holes and are used for the filter housing to pass through. The bottom of the top plate has downward-protruding annular protrusions near the multiple top plate through holes. The lower parts of the multiple annular protrusions are placed in the multiple annular mounting grooves and press down on the corresponding soft washers, allowing the inner wall of the soft washers to extend inward in the circumferential direction. The top plate has multiple vertical top plate guide through holes and multiple vertical top plate connecting through holes near the edge. Multiple guide posts pass through the multiple middle plate guide through holes and multiple top plate guide through holes from bottom to top. Multiple connecting screws pass through the multiple top plate connecting through holes and multiple middle plate connecting through holes from top to bottom and are connected to the multiple connecting screw holes.

2. The filter batch testing fixture based on omnidirectional soft positioning according to claim 1, characterized in that: A positioning retaining ring is provided on the inner wall of the annular protrusion near the lower end, protruding inward in a circumferential direction. The upper part of the soft washer near the outer peripheral edge extends inward and upward to form a positioning soft ring. The positioning soft ring is located above the part between the inner wall of the annular mounting groove and the corresponding hole wall of the middle plate through hole and below the positioning retaining ring.

3. The filter batch testing fixture based on omnidirectional soft positioning according to claim 2, characterized in that: The lower end of the annular protrusion is provided with a top plate annular conical surface that slopes from bottom to top and from outside to inside. The upper part of the connection between the top of the soft washer and the top of the positioning soft ring is the soft washer annular conical surface. The top plate annular conical surface and the soft washer annular conical surface have the same taper and are in contact with each other.

4. The filter batch testing fixture based on omnidirectional soft positioning according to claim 1, 2 or 3, characterized in that: Multiple filter mounting positions protrude upward to form mounting bosses. The upper ends of the mounting bosses are provided with vertical positioning blind holes. The lower part of the first soft pad is provided with multiple downward-protruding lower positioning protrusions. The multiple lower positioning protrusions are respectively placed in the multiple positioning blind holes that correspond one-to-one.

5. The filter batch testing fixture based on omnidirectional soft positioning according to claim 4, characterized in that: The outer periphery of the base plate is provided with an upwardly protruding base plate ring. The top of the base plate ring is higher than the top of the mounting boss and lower than the top of the first soft pad when it is in its normal state. The bottom of the middle plate is provided with upwardly recessed inverted "L" shaped grooves near the two ends of the multiple middle plate through holes. The multiple second soft pads are respectively placed in the multiple inverted "L" shaped grooves that correspond to each other.

6. The filter batch testing fixture based on omnidirectional soft positioning according to claim 1, 2 or 3, characterized in that: The second soft pad has a vertical clearance hole at the position corresponding to the upper positioning protrusion.

7. The filter batch testing fixture based on omnidirectional soft positioning according to claim 1, 2 or 3, characterized in that: Both the first and second soft pads are silicone pads, and the soft pad ring is a silicone ring.

Images