A PCB electronic component resistance test system for environmental protection equipment

Abstract

The invention belongs to the technical field of PCB electronic component testing, and particularly relates to a PCB electronic component resistance testing system for environmental protection equipment, comprising a feeding module, wherein the feeding module adopts a conveyor belt assembly to convey the PCB electronic components to be tested to the bottom of the testing module, and the testing module comprises a testing box, a probe contact mechanism and a needle driving mechanism, wherein the testing box is suspended and fixed above the feeding module, and a probe contact mechanism is installed in the testing box in a lifting manner, and a needle driving mechanism is arranged above the probe contact mechanism, and the needle driving mechanism is used for respectively conducting connection between a test needle of the needle driving mechanism and a plurality of test probes on the probe contact mechanism; the invention does not cause wear or damage to the PCB board due to frequent contact between the test needle and the PCB board, and can also improve the accuracy of resistance testing of the PCB board.

Description

Technical Field

[0001] The invention belongs to the technical field of PCB electronic component testing, and in particular relates to a PCB electronic component resistance testing system for environmental protection equipment. Background Art

[0002] Electronic component assembly PCB board is the general term for component devices, assembly PCB board, can also be called circuit board, circuit board.

[0003] Since there are many locations for resistance testing on PCB electronic components, most of the existing testing equipment performs resistance testing by moving the test needle 58 to contact the test hole on the PCB electronic component. Since there are many points that need to be tested, the test needle needs to frequently contact the PCB board. Since the test needle frequently contacts the PCB board with a certain pressure, it is not only easy to damage the PCB board, but also easy to cause wear on the surface of the PCB board, which can easily reduce the accuracy and efficiency of resistance testing on the PCB board. Summary of the invention

[0004] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention is a PCB electronic component resistance testing system for environmental protection equipment, comprising a feeding module, wherein the feeding module adopts a conveyor belt assembly to convey the PCB electronic components to be tested to the bottom of the testing module, wherein the testing module comprises a testing box, a probe contact mechanism and a needle driving mechanism, wherein the testing box is suspended and fixed above the feeding module, and a probe contact mechanism is installed in the testing box for lifting, and a needle driving mechanism is arranged above the probe contact mechanism, and a test needle of the needle driving mechanism is conductively connected with a test probe on the probe contact mechanism.

[0006] Furthermore, the probe contact mechanism includes a square frame, a connecting corner block, a probe plate, a metal probe and a lifting cylinder. The square frame is suspended in the test box, and at least four connecting corner blocks are fixed on the outer frame of the square frame. A probe plate is installed on the square frame, and a plurality of metal probes are installed in a probe plate matrix. Each of the connecting corner blocks is connected to the piston rod of a vertically arranged lifting cylinder, and the top of the test box is fixed to the top end of the cylinder body of the vertical lifting cylinder. The plurality of metal probes respectively contact the test holes of the PCB electronic components to be tested.

[0007] Furthermore, the probe contact mechanism also includes an insulating plate, a clamping plate, a limiting column and a buffer gasket. The upper surface of the probe plate is connected to the insulating plate, and the size of the insulating plate is larger than the size of the probe plate. The upper surface of the square frame forms a square groove, and the insulating plate is inserted into the square groove. The clamping plate is attached to the upper surface of the square frame, and the lower surface of the clamping plate is provided with a square card slot upward. The thickness of the clamping plate is equal to the sum of the depths of the square groove and the square card slot. The top end surface of the metal probe extends out of the top end surface of the clamping plate and is flush with the top end surface of the clamping plate. The insulating plate and the square card slot have corresponding limiting slot holes at the bottom. A limiting column is formed on the needle body of the metal probe, and the limiting column is inserted into the limiting slot hole. Buffer gaskets are provided at the bottom and top of the limiting slot hole, and the buffer gasket is sleeved on the needle body of the metal probe.

[0008] Furthermore, the four connecting corner blocks are respectively fixed at the four corners of the square frame, and the thickness of the connecting corner blocks is greater than the thickness of the square frame. The four corners of the square frame and the clamping plate are all arc corners, and the joints between the connecting corner blocks and the corners are also arc settings, and each of the connecting corner blocks is provided with a locking assembly.

[0009] Further, the locking assembly includes a threaded rod, a clamping strip, a clamping washer, a nut and a connecting screw. A plug-in hole is formed on the upper surface of the connecting angle block, and a threaded rod is vertically inserted in the plug-in hole. The clamping strip is sleeved on the threaded rod, and the lower surface of the clamping strip is attached to the clamping plate. A clamping washer and a nut are sequentially attached to the upper surface of the clamping strip, and the clamping washer and the nut are both sleeved on the threaded rod. A threaded through hole is opened upward on the lower surface of the connecting angle block, and the threaded through hole is opened upward to the inside of the threaded rod. A connecting screw is threadedly connected to the inner thread of the threaded through hole, and the nail head of the connecting screw is located on the lower surface of the connecting angle block.

[0010] Furthermore, the needle driving mechanism includes a supporting block, a transmission screw, a suspended slider, a suspended strip, a supporting ear block, a double-rotation screw, a mounting block and a test needle. The symmetrical supporting blocks are also suspended at the front and rear walls inside the test box through symmetrical lifting cylinders, and a transmission screw is rotatably installed between the two. A suspended slider is sleeved on the transmission screw through a screw nut. A suspended strip is fixed horizontally on the left and right sides of the lower surface of the suspended slider, and supporting ear blocks are fixed at both ends of the suspended strip. A double-rotation screw is rotatably installed between the symmetrical supporting ear blocks, and mounting blocks are symmetrically sleeved on the double-rotation screw through symmetrical screw nuts. A test needle is detachably installed on the lower surface of each mounting block.

[0011] Furthermore, the symmetrical sides of the symmetrical conveyor belt assembly are provided with movement grooves, and the movement grooves are symmetrical.

[0012] Furthermore, the front side of the test box is made of transparent glass, and the front side panel of the test box is detachable.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention installs a probe board in a lifting square frame, and a plurality of metal probes are installed in a rectangular array on the probe board. Therefore, the square frame descends vertically, and then the plurality of metal probes installed in a matrix on the probe board will respectively contact the test holes to be tested opened on the PCB board, and then the needle driving mechanism drives the test needle to slide above the probe board and contact the top ends of the metal probes at different points respectively. The metal probes can play a role of conductive connection, and thus there is no need for the test needle with a certain pressure to frequently contact the PCB board, causing damage or wear to the PCB board; at the same time, other metal probes that are not conductively connected with the test needle can play a role of contact and compression on the PCB board, preventing the test needle from sliding or tilting on the conveyor belt assembly when the top ends of the plurality of metal probes are connected for resistance testing, thereby affecting the stability of the resistance test of the PCB board.

[0015] 2. According to the present invention, the square card slot on the pressing plate can press and fix the insulating plate to the square frame through the cooperation of the pressing plate and the locking assembly, and then the nut is twisted to drive the pressing washer to move downward along the threaded rod, so that the nut can lock and fix the pressing strip to the upper surface of the pressing plate, so that the pressing plate can be safely and firmly installed on the square frame, thereby realizing the limit fixation of multiple metal probes, preventing the metal probes from tilting or shaking when contacting the PCB board, and the buffer washer placed in the limit slot can play an elastic buffering role for the metal probes, preventing the surface of the PCB board from being damaged due to the rigid installation of the metal probes when the multiple metal probes descend and contact the PCB board.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure disclosed in the present invention;

[0019] Figure 2 It is a schematic diagram of the internal structure of the test box disclosed in the present invention;

[0020] Figure 3 It is a structural diagram of the probe contact mechanism disclosed in the present invention;

[0021] Figure 4 A cross-sectional view of the compression plate disclosed in the present invention;

[0022] Figure 5 It is a structural diagram of the locking assembly disclosed in the present invention;

[0023] Figure 6 It is a cross-sectional view of the connecting corner block disclosed in the present invention;

[0024] Figure 7 The structure diagram of the watch hand driving mechanism disclosed in the present invention.

[0025] In the figure: 1. conveyor belt assembly; 2. test box; 3. probe contact mechanism; 31. square frame; 311. square groove; 32. connecting corner block; 321. plug-in hole; 322. threaded through hole; 33. probe plate; 34. metal probe; 35. lifting cylinder; 36. insulating plate; 37. clamping plate; 371. square slot; 372. limit slot; 38. limit column; 39. buffer washer; 4. locking assembly; 41. threaded rod; 42. clamping strip; 43. clamping washer; 44. nut; 45. connecting screw; 5. needle driving mechanism; 51. supporting block; 52. transmission screw; 53. suspended slider; 54. suspended strip; 55. supporting ear block; 56. double-rotation screw; 57. mounting block; 58. test needle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] See also Figure 1-Figure 7As shown, the present invention is a PCB electronic component resistance test system for environmental protection equipment, 1. It includes a feeding module, the feeding module uses a conveyor belt assembly 1 to convey the PCB electronic components to be tested to the bottom of the test module, the test module includes a test box 2, a probe contact mechanism 3 and a needle drive mechanism 5, the test box 2 is suspended and fixed above the feeding module, and the probe contact mechanism 3 is lifted and installed in the test box 2, the needle drive mechanism 5 is arranged above the probe contact mechanism 3, and the test needle 58 of the needle drive mechanism 5 is conductively connected with the test probe on the probe contact mechanism 3;

[0029] Specifically, when the resistance test of the PCB board needs to be performed, the PCB board to be tested is placed on the conveyor belt assembly 1 of the loading module, and the conveyor belt assembly 1 will convey the PCB board to the bottom of the test box 2 made of transparent glass. Then, the probe contact mechanism 3 will descend in the test box 2, so that the metal probes 34 installed in a matrix will be respectively inserted into or contacted with the test holes of the PCB board directly below. Then, the needle driving mechanism 5 is controlled to enable the two test needles 58 to slide above the probe contact mechanism 3 and be conductively connected with the corresponding metal probes 34 that need to be tested for resistance, so that the test module can perform resistance test on the points on the PCB board that need to be tested for resistance. The test needle 58 is then driven by the needle driving mechanism 5 to continuously control the sliding movement of the test needle 58 or adjust the distance between the two test needles 58 so as to make it contact with the metal probes 34 of other matrix designs, thereby facilitating resistance testing of other points of the PCB board. This can not only improve the accuracy of resistance testing of PCB electronic components, but also because the metal probes 34 of matrix design are always in contact with the PCB board, only the test needle 58 continuously slides and contacts with the top of the metal probes 34 at different positions to perform conductive connection resistance testing. Therefore, the test needle 58 will not be worn or damaged due to frequent contact with the PCB board, and the accuracy of resistance testing of the PCB board can also be improved.

[0030] In this embodiment, the probe contact mechanism 3 includes a square frame 31, a connecting corner block 32, a probe plate 33, a metal probe 34 and a lifting cylinder 35. The square frame 31 is suspended in the test box 2, and at least four connecting corner blocks 32 are fixed on the outer frame of the square frame 31. A probe plate 33 is installed on the square frame 31, and a plurality of metal probes 34 are installed in a matrix on the probe plate 33. Each of the connecting corner blocks 32 is connected to the piston rod of a vertically arranged lifting cylinder 35, and the top of the cylinder body of the vertical lifting cylinder 35 is fixed with the top of the test box 2. The plurality of metal probes 34 are respectively in contact with the test holes of the PCB electronic components to be tested.

[0031] Specifically, when the PCB board to be tested is transported to the bottom of the test box 2, the piston rods of the multiple lifting cylinders 35 are synchronously extended, so that they drive the square frame 31 to descend vertically through the connecting corner block 32, and then the multiple metal probes 34 installed in a matrix on the probe plate 33 will respectively contact the test holes to be tested opened on the PCB board, and then the needle driving mechanism 5 drives the test needle 58 to slide above the probe plate 33 and contact the top surfaces of the metal probes 34 at different points, and the metal probes 34 can play a role of conductive connection, so there is no need for the test needle 58 with a certain pressure to frequently contact the PCB board, causing damage or wear to the PCB board; at the same time, other test needles that are not conductively connected to the test needle 58 The metal probes 34 can play a contact and pressing role on the PCB board to prevent the test needles 58 from slipping or tilting on the conveyor belt assembly 1 when the resistance test is carried out on the top surfaces of multiple metal probes 34, thereby affecting the stability of the PCB board resistance test, and there is no need to set a clamping mechanism separately on the conveyor belt assembly 1 to clamp the PCB board; and when the PCB board test is completed, the piston rod of the lifting cylinder 35 contracts, so that it drives the probe board 33 and the metal probes 34 to move upward through the square frame 31, so that the multiple metal probes 34 are out of contact with the PCB board, thereby facilitating the conveyor belt assembly 1 to continue to transport the PCB board to be tested to the bottom of the test box 2 for resistance testing.

[0032] In this embodiment, the probe contact mechanism 3 also includes an insulating plate 36, a clamping plate 37, a limiting column 38 and a buffer gasket 39. The upper surface of the probe plate 33 is connected to the insulating plate 36, and the size of the insulating plate 36 is larger than the size of the probe plate 33. The upper surface of the square frame 31 forms a square groove 311, and the insulating plate 36 is inserted into the square groove 311. The clamping plate 37 is attached to the upper surface of the square frame 31, and the lower surface of the clamping plate 37 is upwardly opened with a square card slot 371. The thickness of the clamping plate 37 is The depth of the square groove 311 and the square card slot 371 is equal to the sum of the depths of the square groove 311 and the square card slot 371. The top surface of the metal probe 34 extends out of the top surface of the pressing plate 37 and is flush with the top surface of the pressing plate 37. The insulating plate 36 and the bottom of the square card slot 371 are correspondingly provided with a limiting slot hole 372. A limiting column 38 is formed on the needle body of the metal probe 34, and the limiting column 38 is inserted into the limiting slot hole. The bottom and top of the limiting slot hole 372 are both provided with a buffer washer 39, and the buffer washer 39 is sleeved on the needle body of the metal probe 34.

[0033] Specifically, when it is necessary to replace the metal probe 34 that has been worn out after long-term use, or to remove the unnecessary metal probe 34, the pressing plate 37 is first removed from the square frame 31, so that the square card slot 371 is disengaged from the insulating plate 36, and the limiting slot 372 located in the square card slot 371 is disengaged from the upper limiting column 38, and then the insulating plate 36 is pulled out of the square groove 311 of the square frame 31. At this time, the probe plate 33 will drive multiple metal probes 34 to be taken out from the square frame 31, and then the metal probes 34 that need to be replaced or removed are removed from the limiting slots 372 corresponding to the insulating plate 36. 72, and then the replaced probe plate 33 is further inserted into the square frame 31, the insulating plate 36 can support the probe plate 33, and the clamping plate 37 can clamp and fix the insulating plate 36 to the square frame 31, and at the same time, through the cooperation of the limiting column 38 and the limiting slot 372, the multiple metal probes 34 can be detachably installed on the probe plate 33, and the buffer gasket 39 placed in the limiting slot 372 can play a role of elastic buffering for the metal probes 34, so as to prevent the rigid installation of the metal probes 34 from damaging the surface of the PCB board when the multiple metal probes 34 descend and contact the PCB board.

[0034] In this embodiment, the four connecting corner blocks 32 are respectively fixed at the four corners of the square frame 31, and the thickness of the connecting corner blocks 32 is greater than the thickness of the square frame 31. The four corners of the square frame 31 and the pressing plate 37 are all arc corners, and the joints between the connecting corner blocks 32 and the corners are also arc settings. Each of the connecting corner blocks 32 is provided with a locking assembly 4;

[0035] Specifically, the four connecting corner blocks 32 are respectively fixed to the four corners of the square frame 31, so as to provide stable suspension support for the square frame 31; and the thickness of the four connecting corner blocks 32 is greater than that of the square frame 31, so that when the clamping plate 37 is attached to the upper surface of the square frame 31, the connecting corner blocks 32 can play a role of vertical guiding and limiting the clamping plate 37, thereby preventing the clamping plate 37 from being misplaced or tilted down above the square frame 31, causing the limiting slot hole 372 on the clamping plate 37 to be unable to accurately correspond to the limiting column 38, thereby affecting the clamping plate 37 from accurately clamping and fixing the insulating plate 36 to the square frame 31, thereby affecting the accurate installation and use of the metal probe 34; and the locking assembly 4 on the connecting corner block 32 will stably and firmly lock the clamping plate 37 on the square frame 31.

[0036] In this embodiment, the locking assembly 4 includes a threaded rod 41, a clamping strip 42, a clamping washer 43, a nut 44 and a connecting screw 45. The upper surface of the connecting angle block 32 is formed with a plug-in hole 321, and the threaded rod 41 is vertically inserted in the plug-in hole 321. The threaded rod 41 is sleeved with the clamping strip 42, and the lower surface of the clamping strip 42 is attached to the clamping plate 37. The upper surface of the clamping strip 42 is sequentially attached with a clamping washer 43 and a nut 44, and the clamping washer 43 and the nut 44 are both sleeved on the threaded rod 41. The lower surface of the connecting angle block 32 is upwardly opened with a threaded through hole 322, and the threaded through hole 322 is upwardly opened to the inside of the threaded rod 41. The threaded through hole 322 is threadedly connected to the connecting screw 45, and the nail head of the connecting screw 45 is located on the lower surface of the connecting angle block 32.

[0037] Specifically, when the clamping plate 37 is connected to the arc-shaped surface guide limit of the corner block 32 and is fitted to the square frame 31, the clamping strip 42 is pushed upward and rotated to make the clamping strip 42 fit to the upper surface of the clamping plate 37, and then the nut 44 is twisted to drive the clamping washer 43 to move downward along the threaded rod 41, so that the nut 44 can lock and fix the clamping strip 42 to the upper surface of the clamping plate 37, so that the clamping plate 37 can be safely and firmly installed on the square frame 31, realizing the limit fixation of multiple metal probes 34, and preventing the metal probes 34 from being entangled with When the PCB board is in contact, the metal probe 34 becomes skewed or shakes; the nut 44 is twisted in the reverse direction to loosen the clamping strip 42, and the clamping strip 42 is moved to break away from the clamping plate 37, thereby facilitating the removal of the clamping plate 37 from the square frame 31; and the connecting screw 45 on the lower surface of the connecting angle block 32 is twisted to withdraw it from the threaded through hole 322 opened at the bottom end of the threaded rod 41, thereby facilitating the removal and separation of the square frame 31 from the threaded rod 41, and the clamping strip 42 that has been worn out after long-term use can also be removed and replaced.

[0038] In this embodiment, the needle driving mechanism 5 includes a support block 51, a transmission screw 52, ​​a suspended slider 53, a suspended strip 54, a support ear block 55, a double-rotation screw 56, a mounting block 57 and a test needle 58. The symmetrical support block 51 is also suspended at the front and rear walls of the test box 2 through a symmetrical lifting cylinder 35, and a transmission screw 52 is rotatably installed between the two. The transmission screw 52 is sleeved with a suspended slider 53 through a screw nut. The lower surface of the suspended slider 53 is horizontally fixed with a suspended strip 54, and the two ends of the suspended strip 54 are fixed with support ear blocks 55. A double-rotation screw 56 is rotatably installed between the symmetrical support ear blocks 55, and a mounting block 57 is symmetrically sleeved on the double-rotation screw 56 through a symmetrical screw nut. A test needle 58 is detachably installed on the lower surface of each mounting block 57.

[0039] Specifically, the lifting cylinder 35 on the upper surface of the supporting block 51 drives the transmission screw 52 to rise or fall, and then drives the symmetrical test needles 58 below the suspended strip 54 to rise or fall through the suspended slider 53, so that the test needles 58 can accurately contact the top end of the metal probe 34, and the double-rotation screw 56 is driven by a servo motor fixed on the outer end face of one of the supporting ear blocks 55, so that the symmetrical mounting blocks 57 will drive the test needles 58 to move away from or close to each other, so that the bottom end of the test needle 58 can contact the top surface of the rectangular array metal probe 34, thereby realizing resistance testing of different points on the PCB board.

[0040] In this embodiment, the symmetrical conveyor belt assembly 1 is provided with movable grooves on the symmetrical sides, and the movable grooves are symmetrical; specifically, the movable grooves provided on the conveyor belt assembly 1 facilitate placing the PCB board directly under the stable conveyor belt test box 2 for resistance testing.

[0041] In this embodiment, the front side of the test box 2 is made of transparent glass, and the front side panel of the test box 2 is detachable.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A PCB electronic component resistance test system for environmental protection equipment, characterized in that: The invention comprises a loading module, wherein the loading module adopts a conveyor belt assembly (1) for conveying PCB electronic components to be tested to the bottom of the test module, wherein the test module comprises a test box (2), a probe contact mechanism (3) and a needle drive mechanism (5), wherein the test box (2) is suspended and fixed above the loading module, and a probe contact mechanism (3) is installed in the test box (2) in a lifting manner, and a needle drive mechanism (5) is arranged above the probe contact mechanism (3), and a test needle (58) of the needle drive mechanism (5) is electrically connected to a test probe on the probe contact mechanism (3); The probe contact mechanism (3) comprises a square frame (31), a connecting corner block (32), a probe plate (33), a metal probe (34) and a lifting cylinder (35); the square frame (31) is suspended in the test box (2), and at least four connecting corner blocks (32) are fixed on the outer frame of the square frame (31); a probe plate (33) is installed on the square frame (31), and a plurality of metal probes (34) are installed in a matrix on the probe plate (33); each of the connecting corner blocks (32) is connected to a piston rod of a vertically arranged lifting cylinder (35), and the top of the cylinder body of the vertical lifting cylinder (35) is fixed to the top of the test box (2); and the plurality of metal probes (34) are respectively in contact with the test holes of the PCB electronic components to be tested.

2. A PCB electronic component resistance testing system for environmental protection equipment according to claim 1, characterized in that: The probe contact mechanism (3) also includes an insulating plate (36), a clamping plate (37), a limiting column (38) and a buffer gasket (39); the upper surface of the probe plate (33) is connected to the insulating plate (36), and the size of the insulating plate (36) is larger than the size of the probe plate (33); the upper surface of the square frame (31) forms a square groove (311), and the insulating plate (36) is inserted into the square groove (311); the clamping plate (37) is attached to the upper surface of the square frame (31), and the lower surface of the clamping plate (37) is provided with a square card slot (371) facing upward; the thickness of the clamping plate (37) is The depth of the square groove (311) and the square clamping groove (371) is equal to the sum of the depths of the square groove (311) and the square clamping groove (371); the top end surface of the metal probe (34) extends out of the top end surface of the clamping plate (37) and is flush with the top end surface of the clamping plate (37); the insulating plate (36) and the bottom of the square clamping groove (371) are correspondingly provided with a limiting slot hole (372); a limiting column (38) is formed on the needle body of the metal probe (34), and the limiting column (38) is inserted into the limiting slot hole; the bottom and top of the limiting slot hole (372) are both provided with a buffer gasket (39), and the buffer gasket (39) is sleeved on the needle body of the metal probe (34).

3. A PCB electronic component resistance testing system for environmental protection equipment according to claim 2, characterized in that: The four connecting corner blocks (32) are respectively fixed at the four corners of the square frame (31), and the thickness of the connecting corner blocks (32) is greater than the thickness of the square frame (31). The four corners of the square frame (31) and the pressing plate (37) are all arc corners, and the joints between the connecting corner blocks (32) and the corners are also arc-shaped. A locking assembly (4) is provided on each of the connecting corner blocks (32).

4. A PCB electronic component resistance testing system for environmental protection equipment according to claim 3, characterized in that: The locking assembly (4) comprises a threaded rod (41), a clamping strip (42), a clamping washer (43), a nut (44) and a connecting screw (45); a plug hole (321) is formed on the upper surface of the connecting angle block (32), and a threaded rod (41) is vertically inserted into the plug hole (321); the threaded rod (41) is sleeved with the clamping strip (42), and the lower surface of the clamping strip (42) is attached to the clamping plate (37); the upper surface of the clamping strip (42) is A compression washer (43) and a nut (44) are sequentially attached to the surface, and the compression washer (43) and the nut (44) are both sleeved on the threaded rod (41). A threaded through hole (322) is opened upward on the lower surface of the connecting angle block (32), and the threaded through hole (322) is opened upward to the inside of the threaded rod (41). A connecting screw (45) is connected to the inner thread of the threaded through hole (322), and the nail head of the connecting screw (45) is located on the lower surface of the connecting angle block (32).

5. A PCB electronic component resistance testing system for environmental protection equipment according to claim 2, characterized in that: The needle driving mechanism (5) comprises a supporting block (51), a transmission screw (52), a suspended slider (53), a suspended strip (54), a supporting ear block (55), a double-rotation screw (56), a mounting block (57) and a test needle (58). The symmetrical supporting blocks (51) are also suspended on the front and rear walls of the test box (2) through symmetrical lifting cylinders (35), and a transmission screw (52) is rotatably installed between the two. The transmission screw (52) is connected to the test needle (58) through a screw. A suspended slider (53) is sleeved on the lever nut, and a suspended long strip (54) is fixed horizontally on the left and right sides of the lower surface of the suspended slider (53), and supporting ear blocks (55) are fixed at both ends of the suspended long strip (54), and a double-rotation screw (56) is rotatably installed between the symmetrical supporting ear blocks (55), and a mounting block (57) is symmetrically sleeved on the double-rotation screw (56) through a symmetrical screw nut, and a test needle (58) is detachably installed on the lower surface of each mounting block (57).

6. A PCB electronic component resistance test system for environmental protection equipment according to claim 1, characterized in that: The symmetrical conveyor belt assembly (1) is provided with moving grooves on the symmetrical sides thereof, and the moving grooves are symmetrical.

7. A PCB electronic component resistance test system for environmental protection equipment according to claim 1, characterized in that: The front side of the test box (2) is made of transparent glass material, and the front side panel of the test box (2) is detachable.

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