A PC board strength distribution testing device

Abstract

The invention discloses a PC board strength distribution testing device, which belongs to the technical field of PC board strength testing, and comprises an operating table, wherein a clamping unit for clamping a PC board is arranged on the operating table, an electric hydraulic rod is arranged on the top of the operating table, and one end of a piston rod in the electric hydraulic rod is connected with a distribution testing unit; by means of the arranged electric hydraulic rod and the distribution testing unit, it is realized that pressure strength testing can be performed on different positions of the PC board in the form of single point, multiple points and combination; before testing, the PC board is first clamped and fixed by the clamping unit, and then a plurality of adjusting rods are driven to rotate synchronously by an adjustment unit, so that pressure blocks at different positions protrude outward, so that the device can test the compressive strength of the plate under uniform pressure distribution, and can also perform comprehensive and accurate compressive strength testing on the PC board used for bearing non-uniformly distributed pressure loads or the PC board that may encounter local concentrated loads during use.

Description

Technical Field

[0001] The present invention relates to the technical field of PC board strength inspection, and in particular to a PC board strength distribution inspection device. Background Art

[0002] PC board, also known as polycarbonate board, polyester board, capron board, is resistant to weak acid. It is made of polycarbonate as the main component and adopts co-extrusion technology CO-EXTRUSION.

[0003] The strength test of PC board is an important part to ensure its quality and safety. Through the PC board strength distribution test device, the strength performance and service life of PC board can be evaluated, providing a reliable basis for the selection and application of materials.

[0004] Existing PC board strength distribution testing devices, especially those for compressive strength testing, are often limited in actual operation to applying pressure only in the middle or a single position of the PC board to evaluate its compressive performance. Although this testing method can effectively reflect the bearing capacity of the board under uniform pressure distribution, it ignores the actual application scenarios of PC boards in complex stress environments. In particular, when the PC board is designed to withstand non-uniformly distributed pressure loads, or is expected to encounter local concentrated loads during use, the current testing device is unable to fully and accurately evaluate its compressive strength under actual working conditions. Summary of the invention

[0005] The purpose of the present invention is to propose a PC board strength distribution testing device to solve the problem that when a PC board is designed to withstand non-uniformly distributed pressure loads or is expected to encounter local concentrated loads during use, the current testing device is incapable of fully and accurately evaluating its compressive strength under actual working conditions.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A PC board strength distribution inspection device comprises an operating table, on which a clamping unit for clamping the PC board is mounted, and on the top of the operating table an electric hydraulic rod is mounted, and one end of a piston rod in the electric hydraulic rod is connected to a distribution inspection unit;

[0008] The distribution inspection unit comprises an installation box, the inner bottom wall of the installation box is provided with at least one installation groove, a bottom box is fixed in the installation groove, a pressure block is slidably connected in the bottom box through a vertical slide groove, at least one adjustment rod is rotatably connected to the top of the inner wall of the installation box, and an adjustment unit for driving the adjustment rod to rotate is mounted on the outer wall of the installation box;

[0009] The adjusting rod is driven by the adjusting unit to rotate to different angles, so that the pressure blocks at different positions protrude outward from the bottom box individually, simultaneously or in combination, and then the pressure blocks are gradually pressed against the surface of the PC board through the electric hydraulic rod, thereby realizing the distribution inspection of the strength at different positions on the surface of the PC board.

[0010] As a further description of the above technical solution:

[0011] The pressure block comprises a main body block, a bottom groove is provided in the middle of the lower surface of the main body block, a pressure sensor is mounted on the bottom wall of the bottom groove, and a resistance block is mounted on the pressure sensor;

[0012] Slide blocks matched with the vertical slide grooves are fixed to the tops of both sides of the main block. The main block is slidably assembled in the bottom box through the slide blocks. A first spring is fixed on the bottom wall of the vertical slide groove, and the top of the first spring is fixed to the slide block.

[0013] As a further description of the above technical solution:

[0014] The adjusting rod comprises a shaft connected to the installation box by rotation, and at least seven push rod groups are fixed on the shaft for pushing pressure blocks at different positions out from the bottom box individually, simultaneously or in combination.

[0015] As a further description of the above technical solution:

[0016] The adjustment unit comprises two driving pulleys which are rotatably connected to the two sides of the outer wall of the installation box respectively, and a driven pulley is fixed to one end of the shaft rod which passes through the installation box, and a synchronous belt is meshed and connected to the driving pulley and the driven pulley;

[0017] A plurality of limiting slide grooves are provided in the middle of the outer wall of the installation box, two slide plates are slidably mounted in the limiting slide grooves, two tensioning shafts are rotatably connected to the outer wall of the slide plate, the two tensioning shafts are respectively in contact with the outer wall and the inner bottom wall of the synchronous belt, and the other ends of the two tensioning shafts are jointly equipped with limiting frames, and both ends of the limiting frames are fixed to the slide plate;

[0018] A limiting ring is fixed on the slide plate, a positioning rod is passed through the limiting ring, a limiting plate is fixed to one side of the outer surface of the positioning rod, a second spring is fixed between the limiting ring and the limiting plate, the second spring is sleeved on the positioning rod, a side wall of the limiting slide groove is provided with a plurality of positioning holes distributed in a linear array, one end of the positioning rod is inserted into the positioning hole, so that the position of the slide plate is fixed after sliding.

[0019] As a further description of the above technical solution:

[0020] An extension plate is fixed on both the driving pulley and the driven pulley, a knob stud is threaded through the extension plate, and a plurality of threaded holes are opened on the outer wall of the installation box;

[0021] One end of the knob stud is threadedly connected in the threaded hole, so that the driving pulley and the driven pulley are fixed on the outer wall of the installation box after being rotated.

[0022] As a further description of the above technical solution:

[0023] The operating table comprises a base, a vertical rod is fixed on the base, a top plate is fixed on the top end of the vertical rod, and the electric hydraulic rod is fixed on the top plate.

[0024] As a further description of the above technical solution:

[0025] A moving sleeve is slidably mounted on the vertical rod, the inner side of the moving sleeve is fixed to the installation box, and the installation box is slidably mounted on the vertical rod through the moving sleeve.

[0026] As a further description of the above technical solution:

[0027] The clamping unit comprises a placement seat mounted on the base, a side support seat is slidably mounted on the inner bottom wall of the placement seat, a screw rod is rotatably connected to the middle part of the inner bottom wall of the placement seat through a long groove, an internal threaded member is threadedly sleeved on the screw rod, and the top of the internal threaded member is fixed to the lower surface of the side support seat;

[0028] A support plate matched with the side support seat is fixed on one side wall of the placement seat.

[0029] As a further description of the above technical solution:

[0030] The tops of the outer walls of the side support seat and the placement seat are both provided with through grooves, in which a clamping plate is inserted, and the lower surface of the clamping plate is slidably connected to a guide sliding block through a guide sliding groove;

[0031] Positioning blocks are fixed on the outer walls of the side support seat and the placement seat, and an adjusting stud is threadedly penetrated on the positioning block. One end of the adjusting stud passes through the positioning block and is rotatably connected to the lower surface of the guide sliding block.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] Through the electric hydraulic rod and distributed inspection unit, it is possible to conduct pressure strength inspection on different positions of the PC board in single point, multi-point and combined forms. Before the inspection, the PC board is clamped and fixed by the clamping unit, and then the adjustment unit drives multiple adjustment rods to rotate synchronously, so that the pressure blocks at different positions protrude outward;

[0034] At the same time, the tensioning shaft can be moved to make the synchronous belt away from a driven pulley, so that the driven pulley can be rotated to drive the adjustment rod connected to it to rotate, so that the pressure block under the adjustment rod can protrude outward in a single point, multiple points or combination, and the pressure blocks pushed out by other adjustment rods can be combined into more forms of points.

[0035] After adjusting the required test points, the electric hydraulic rod can drive the installation box to descend, so that the protruding pressure block gradually presses against the PC board, and then the PC board is tested at multiple points. When used in combination, the device can test the compressive strength of the board under uniform pressure distribution, and can also conduct comprehensive and accurate compressive strength tests on PC boards that are used to withstand non-uniformly distributed pressure loads or PC boards that may encounter local concentrated loads during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a first viewing angle provided by an embodiment of the present invention is shown;

[0037] Figure 2 It shows a schematic structural diagram of a pressure block provided according to an embodiment of the present invention;

[0038] Figure 3 A schematic structural diagram of an adjustment rod provided in an embodiment of the present invention is shown;

[0039] Figure 4 A schematic diagram of the structure of an adjustment unit provided in an embodiment of the present invention is shown;

[0040] Figure 5 A schematic diagram of the structure of a second viewing angle provided according to an embodiment of the present invention is shown;

[0041] Figure 6 A schematic structural diagram of a clamping unit provided according to an embodiment of the present invention is shown;

[0042] Figure 7 It shows a schematic diagram of the structure inside the installation box provided according to an embodiment of the present invention;

[0043] Figure 8 A schematic structural diagram of a first viewing angle showing that an adjustment rod according to an embodiment of the present invention pushes pressure blocks at different positions to protrude outwards;

[0044] Fig. 9 A schematic structural diagram of a second viewing angle showing that the adjusting rod according to an embodiment of the present invention pushes the pressure blocks at different positions to protrude outwards;

[0045] Fig.10A schematic diagram of the structure after the PC board is fixed according to an embodiment of the present invention is shown.

[0046] Legend:

[0047] 10. Operating table; 11. Base; 12. Vertical rod; 13. Top plate; 14. Moving sleeve;

[0048] 20. Clamping unit; 21. Seat; 22. Side support seat; 23. Screw; 24. Support plate; 25. Clamping plate; 26. Guide slide; 27. Positioning block; 28. Adjusting stud;

[0049] 30. Electric hydraulic lever;

[0050] 40. Distribution inspection unit; 41. Installation box; 42. Bottom box; 43. Vertical slide groove; 44. Pressure block; 441. Main block; 442. Pressure sensor; 443. Resistance block; 45. Adjustment rod; 451. Shaft rod; 452. Push rod group; 46. Adjustment unit; 461. Active pulley; 462. Driven pulley; 463. Synchronous belt; 464. Slide plate; 465. Tensioning shaft; 466. Positioning rod; 467. Extension plate; 468. Knob stud; 469. Threaded hole; 47. First spring. DETAILED DESCRIPTION

[0051] 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. Example 1

[0052] like Figure 1 - Fig.10 As shown, the present invention provides:

[0053] A PC board strength distribution inspection device includes an operating table 10, on which a clamping unit 20 for clamping the PC board is mounted, and an electric hydraulic rod 30 is mounted on the top of the operating table 10, and one end of a piston rod in the electric hydraulic rod 30 is connected to a distribution inspection unit 40;

[0054] The operating table 10 includes a base 11, a vertical rod 12 is fixed on the base 11, a top plate 13 is fixed on the top of the vertical rod 12, an electric hydraulic rod 30 is fixed on the top plate 13, a moving sleeve 14 is slidably mounted on the vertical rod 12, the inner side of the moving sleeve 14 is fixed to the installation box 41, and the installation box 41 is slidably mounted on the vertical rod 12 through the moving sleeve 14;

[0055] Specifically, after the PC board is clamped and fixed, and the position and number of the pressure blocks 44 protruding outward are adjusted, the installation box 41 can be pushed downward by the electric hydraulic push rod 30. During the movement, under the action of the vertical rod 12 and the movable sleeve 14, the installation box 41 can always maintain vertical downward movement without deviation.

[0056] like Figure 1 , Figure 5 and Figure 6 As shown, the clamping unit 20 includes a placement seat 21 assembled on the base 11, a side support seat 22 is slidably mounted on the inner bottom wall of the placement seat 21, a screw rod 23 is rotatably connected to the middle of the inner bottom wall of the placement seat 21 through a long groove, an internal threaded member is threadedly sleeved on the screw rod 23, and the top of the internal threaded member is fixed to the lower surface of the side support seat 22, and a support plate 24 adapted to the side support seat 22 is fixed to one side wall of the placement seat 21;

[0057] The top of the outer wall of the side support seat 22 and the placement seat 21 is provided with a through groove, and a clamping plate 25 is inserted in the through groove. The lower surface of the clamping plate 25 is slidably connected with a guide slider through a guide slide groove 26. A positioning block 27 is fixed on the outer wall of the side support seat 22 and the placement seat 21. An adjusting stud 28 is threadedly penetrated on the positioning block 27. One end of the adjusting stud 28 passes through the positioning block 27 and is rotatably connected to the lower surface of the guide slider.

[0058] Specifically, when the size of the PC board to be inspected is smaller than the spacing between the side support seat 22 and the support plate 24, the screw rod 23 is rotated to make the internal thread member drive the side support seat 22 to move from the outside to the inside, gradually approaching the support plate 24. After adjusting to a suitable position, the PC board to be inspected is placed on the support plate 24 and the side support seat 22, and then the clamping plate 25 is slid inward to make the clamping plate 25 above the edge of the PC board;

[0059] At this time, the adjusting screw 28 is rotated to move the clamping plate 25 downward, gradually abutting against the surface of the PC board, and clamping and fixing the PC board. It is worth noting that a rubber pad is provided on the lower surface of the clamping plate 25, which is used to prevent slipping and reduce the wear caused by the clamping plate 25 on the PC board.

[0060] like Figure 1 , Figure 5 , Figure 7 , Figure 8 and Fig. 9 As shown, the distribution inspection unit 40 includes an installation box 41, the inner bottom wall of the installation box 41 is provided with at least one installation groove, a bottom box 42 is fixed in the installation groove, a pressure block 44 is slidably connected to the bottom box 42 through a vertical slide groove 43, at least one adjustment rod 45 is rotatably connected to the top of the inner wall of the installation box 41, and an adjustment unit 46 for driving the adjustment rod 45 to rotate is mounted on the outer wall of the installation box 41;

[0061] The adjusting rod 45 is driven by the adjusting unit 46 to rotate to different angles, so that the pressure blocks 44 at different positions protrude outward from the bottom box 42 individually, simultaneously or in combination, and then the pressure blocks 44 are gradually abutted against the surface of the PC board through the electric hydraulic rod 30, thereby realizing the distribution inspection of the strength of different positions on the surface of the PC board.

[0062] like Figure 3 , Figure 7 and Figure 8 As shown, the adjustment rod 45 includes a shaft rod 451 connected to the installation box 41 by rotation, and at least seven groups of push rod groups 452 are fixed on the shaft rod 451 for pushing the pressure blocks 44 at different positions out from the bottom box 42 individually, simultaneously or in combination.

[0063] Preferably, there are three pressure blocks 44 in each row. At this time, the number of rods in the seven different push rod groups 452 is three at most. If the pressure blocks 44 are arranged as A, B, and C from front to back, when different push rod groups 452 are rotated to press against the pressure blocks 44, A will protrude outward alone, B will protrude outward alone, C will protrude outward alone, ABC will protrude outward together, AB will protrude outward, AC will protrude outward, and BC will protrude outward. There are 7 types of outward protrusions of pressure blocks 44 in each row. In cooperation with pressure blocks 44 in other rows, more types of protrusions can be combined, so that more points on the surface of the PC board can be tested for strength alone or in combination.

[0064] like Figure 2 , Figure 5 and Fig. 9 As shown, the pressure block 44 includes a main body block 441, a bottom groove is opened in the middle of the lower surface of the main body block 441, a pressure sensor 442 is mounted on the bottom wall of the bottom groove, and an abutment block 443 is mounted on the pressure sensor 442;

[0065] Slide blocks compatible with the vertical slide grooves 43 are fixed to the tops of both sides of the main block 441. The main block 441 is slidably assembled in the bottom box 42 through the slide blocks. A first spring 47 is fixed on the bottom wall of the vertical slide groove 43, and the top of the first spring 47 is fixed to the slide block.

[0066] Specifically, when the pressure block 44 is squeezed by the push rod group 452, it gradually moves downward and then bulges outward. At this time, the first spring 47 is in a compressed state. In the process of applying pressure to the PC board through the electric hydraulic rod 30, the pressure sensor 442 can provide real-time feedback on the applied pressure. When the push rod group 452 no longer presses against the pressure block 44, the pressure block 44 is reset upward under the action of the elastic force of the first spring 47.

[0067] like Figure 4 , Figure 5, Figure 7 and Fig.10 As shown, the adjustment unit 46 includes two driving pulleys 461 rotatably connected to the outer walls of the installation box 41, and a driven pulley 462 is fixed to one end of the shaft 451 that passes through the installation box 41. The driving pulley 461 and the driven pulley 462 are meshed and connected with a synchronous belt 463.

[0068] An extension plate 467 is fixed to both the driving pulley 461 and the driven pulley 462. A knob stud 468 is threadedly passed through the extension plate 467. A plurality of threaded holes 469 are formed on the outer wall of the installation box 41.

[0069] One end of the knob stud 468 is threadedly connected to the threaded hole 469, so that the driving pulley 461 and the driven pulley 462 are fixed to the outer wall of the installation box 41 after rotation, and the threaded holes 469 in each group are distributed in the form of a ring array;

[0070] By rotating the active pulley 461, the driven pulley 462 can be driven to rotate through the synchronous belt 463, so that the multiple shafts 451 can rotate together, so that the pressure blocks 44 in different rows can protrude outward in the same condition. After adjustment, tighten the knob stud 468 to fix the positions of the active pulley 461 and the driven pulley 462, and then fix the position of the shaft 451, so that the protruding pressure block 44 can maintain this state. Example 2

[0071] like Figure 4 , Figure 5 , Figure 7 and Fig. 9 As shown, a plurality of limiting slide grooves are provided in the middle of the outer wall of the installation box 41, and two slide plates 464 are slidably mounted in the limiting slide grooves. Two tensioning shafts 465 are rotatably connected to the outer wall of the slide plate 464. The two tensioning shafts 465 are respectively in contact with the outer wall and the inner bottom wall of the synchronous belt 463. The other ends of the two tensioning shafts 465 are jointly equipped with a limiting frame. Both ends of the limiting frame are fixed to the slide plate 464, and the other end of the tensioning shaft 465 is rotatably connected to the inner wall of the limiting frame.

[0072] A limiting ring is fixed on the slide plate 464, a positioning rod 466 is inserted in the limiting ring, a limiting plate is fixed on one side of the outer surface of the positioning rod 466, a second spring is fixed between the limiting ring and the limiting plate, the second spring is sleeved on the positioning rod 466, a side wall of the limiting slide groove is provided with a plurality of positioning holes distributed in a linear array, one end of the positioning rod 466 is inserted into the positioning hole, so that the slide plate 464 is fixed in position after sliding;

[0073] Preferably, when it is necessary to rotate one of the shafts 451 separately, the upper positioning rod 466 is pulled out from the positioning hole, and then the upper slide plate 464 is pulled upward by the positioning rod 466, so that the upper tensioning shaft 465 drives the inner top wall of the synchronous belt 463 away from the driven pulley 462 at the end of the shaft 451, and then the lower positioning rod 466 is pulled out from the positioning hole into which it is inserted, and then the lower slide plate 464 is pulled downward by the positioning rod 466, so that the lower tensioning shaft 465 drives the inner top wall of the synchronous belt 463 away from the upper The driven pulley 462, when the synchronous belt 463 rotates, can drive other driven pulleys 462 to rotate, while the driven pulley 462 does not rotate. At this time, the driven pulley 462 can be rotated to drive the shaft 451 connected thereto to rotate, so that the pressure block 44 under the shaft 451 can present different protrusion modes with other pressure blocks 44, thereby forming more inspection point combinations. It is worth noting that when the push rod group 452 is perpendicular to the pressure block 44 during rotation, the pressure block 44 protrudes outward to the greatest extent;

[0074] Preferably, when the lifting range of the clamp 25 does not match the thickness of the PC board to be inspected, when performing multi-point inspection on one side of the upper surface of the board, the shaft 451 above one side of the upper surface of the board is controlled to rotate by the above-mentioned method of separately controlling the shaft 451, so that the pressure block 44 on this side presents the required protrusion combination, and at least one driven pulley 462 at the edge of the other side is rotated, so that at least one shaft 451 at the edge is rotated and rotated to a state where the pressure blocks 44 below the shaft 451 protrude outward at the same time. At this time, during the downward pressing process, the protruding pressure block 44 can press the PC board to prevent this side from warping during the detection process.

[0075] Specifically, when the PC board strength distribution inspection device is working / in use:

[0076] First, place the PC board to be inspected on the side support seat 22 and the support plate 24, then slide the clamping plate 25 inwards so that the clamping plate 25 is above the edge of the PC board, and then rotate the adjusting stud 28 to move the clamping plate 25 downwards and gradually abut against the surface of the PC board to clamp and fix the PC board to prevent displacement during the inspection process;

[0077] Then, the driving pulley 461 is rotated, and the driven pulley 462 is driven to rotate through the synchronous belt 463, so that the multiple shafts 451 are rotated together, so that the pressure blocks 44 in different rows can protrude outward in the same state and combine into the required inspection points. After adjustment, the knob stud 468 is tightened to fix the positions of the driving pulley 461 and the driven pulley 462, and then the position of the shaft 451 is fixed, so that the protruding pressure blocks 44 can maintain this state;

[0078] Then, the electric hydraulic rod 30 can drive the installation box 41 to descend, so that the protruding pressure block 44 gradually presses against the PC board, and then the PC board is inspected at multiple points. During the inspection, the data fed back by the pressure sensor 442 is used to measure the compressive strength of the PC board.

[0079] After the test, release the PC board and remove it.

[0080] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PC board strength distribution inspection device, comprising an operating table (10), characterized in that: The operating table (10) is equipped with a clamping unit (20) for clamping a PC board, the top of the operating table (10) is equipped with an electric hydraulic rod (30), and one end of a piston rod in the electric hydraulic rod (30) is connected to a distribution inspection unit (40); The distribution inspection unit (40) comprises an installation box (41), the inner bottom wall of the installation box (41) is provided with at least one installation groove, a bottom box (42) is fixed in the installation groove, a pressure block (44) is slidably connected in the bottom box (42) via a vertical slide groove (43), at least one adjustment rod (45) is rotatably connected to the top of the inner wall of the installation box (41), and an adjustment unit (46) for driving the adjustment rod (45) to rotate is mounted on the outer wall of the installation box (41); The adjusting rod (45) is driven by the adjusting unit (46) to rotate to different angles, thereby causing the pressure blocks (44) at different positions to protrude outward from the bottom box (42) individually, simultaneously or in combination, and then the pressure blocks (44) are gradually pressed against the surface of the PC board by the electric hydraulic rod (30), thereby realizing the distribution test of the strength at different positions on the surface of the PC board; The pressure block (44) comprises a main body block (441), a bottom groove is provided in the middle of the lower surface of the main body block (441), a pressure sensor (442) is mounted on the bottom wall of the bottom groove, and a resistance block (443) is mounted on the pressure sensor (442); Slide blocks adapted to the vertical slide grooves (43) are fixed to the tops of both sides of the main body block (441); the main body block (441) is slidably assembled in the bottom box (42) via the slide blocks; a first spring (47) is fixed to the bottom wall of the vertical slide groove (43); the top end of the first spring (47) is fixed to the slide blocks; The adjusting rod (45) comprises a shaft rod (451) connected to the installation box (41) by rotation, and at least seven groups of push rod groups (452) are fixed on the shaft rod (451) for pushing pressure blocks (44) at different positions out from the bottom box (42) individually, simultaneously or in combination; The adjustment unit (46) comprises two driving pulleys (461) respectively rotatably connected to two sides of the outer wall of the installation box (41); one end of the shaft (451) passing through the installation box (41) is fixed with a driven pulley (462); and a synchronous belt (463) is meshedly connected to the driving pulley (461) and the driven pulley (462); A plurality of limiting slide grooves are provided in the middle of the outer wall of the installation box (41), two slide plates (464) are slidably mounted in the limiting slide grooves, two tensioning shafts (465) are rotatably connected to the outer wall of the slide plate (464), the two tensioning shafts (465) are respectively in contact with the outer wall and the inner bottom wall of the synchronous belt (463), and the other ends of the two tensioning shafts (465) are jointly equipped with a limiting frame, and both ends of the limiting frame are fixed to the slide plate (464); A limiting ring is fixed on the slide plate (464), a positioning rod (466) is inserted into the limiting ring, a limiting plate is fixed on one side of the outer surface of the positioning rod (466), a second spring is fixed between the limiting ring and the limiting plate, the second spring is sleeved on the positioning rod (466), a side wall of the limiting slide groove is provided with a plurality of positioning holes distributed in a linear array, one end of the positioning rod (466) is inserted into the positioning hole, so that the position of the slide plate (464) is fixed after sliding.

2. A PC board strength distribution inspection device according to claim 1, characterized in that: An extension plate (467) is fixed to both the driving pulley (461) and the driven pulley (462), a knob stud (468) is threadedly passed through the extension plate (467), and a plurality of threaded holes (469) are formed on the outer wall of the installation box (41); One end of the knob stud (468) is threadedly connected to the threaded hole (469), so that the driving pulley (461) and the driven pulley (462) are rotated and fixed to the outer wall of the installation box (41).

3. A PC board strength distribution inspection device according to claim 1, characterized in that: The operating table (10) comprises a base (11), a vertical rod (12) is fixed on the base (11), a top plate (13) is fixed at the top end of the vertical rod (12), and the electric hydraulic rod (30) is fixed on the top plate (13).

4. A PC board strength distribution inspection device according to claim 3, characterized in that: A moving sleeve (14) is slidably mounted on the vertical rod (12); the inner side of the moving sleeve (14) is fixed to the installation box (41); and the installation box (41) is slidably mounted on the vertical rod (12) via the moving sleeve (14).

5. A PC board strength distribution inspection device according to claim 1, characterized in that: The clamping unit (20) comprises a placement seat (21) mounted on the base (11), a side support seat (22) being slidably mounted on the inner bottom wall of the placement seat (21), a screw rod (23) being rotatably connected to the middle portion of the inner bottom wall of the placement seat (21) via a long groove, an internal threaded member being threadedly sleeved on the screw rod (23), and a top of the internal threaded member being fixed to the lower surface of the side support seat (22); A support plate (24) adapted to the side support seat (22) is fixed to one side wall of the placement seat (21).

6. A PC board strength distribution inspection device according to claim 5, characterized in that: The tops of the outer walls of the side support seat (22) and the placement seat (21) are both provided with through grooves, a clamping plate (25) is inserted into the through groove, and a guide sliding block is slidably connected to the lower surface of the clamping plate (25) via a guide sliding groove (26); A positioning block (27) is fixed on the outer wall of the side support seat (22) and the placement seat (21), and an adjusting stud (28) is threadedly inserted into the positioning block (27). One end of the adjusting stud (28) passes through the positioning block (27) and is rotatably connected to the lower surface of the guide slider.

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