A quick changeover test fixture and test machine

Abstract

This utility model discloses a quick-change test fixture and testing machine. The quick-change test fixture includes a base plate, a lifting plate, an upper mold, and a lower mold. The lower mold is mounted on the base plate, and the upper mold is mounted on the lifting plate and located directly above the lower mold. The lower mold is provided with a quick-connect connector male head, and the base plate is provided with a quick-connect connector female head. It also includes: a first clamping mechanism disposed on the lifting plate, comprising a first guide component, a first limiting component, and a locking component, used for guiding, limiting, and locking the upper mold, respectively; and a second clamping mechanism disposed on the base plate, comprising a second guide component, a rotary tensioning component, a second limiting component, and an ejection component, used for guiding, engaging, tensioning, limiting, and ejecting the lower mold, respectively. This utility model enables rapid switching between the upper and lower molds, greatly reducing changeover time and improving changeover efficiency. Simultaneously, it avoids the need for manual plugging and unplugging of connectors.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a quick-change testing fixture and testing machine. Background Technology

[0002] In the field of electronic product manufacturing, test fixtures are the core equipment for realizing the functional testing of PCB boards. Traditional test fixtures typically employ an upper and lower mold pressing structure, with signal transmission achieved by probes contacting the circuit nodes of the PCB board under test.

[0003] To meet the production needs of multiple varieties and small batches, it is necessary to constantly switch between upper and lower molds of different specifications.

[0004] However, the installation of the upper and lower molds in the existing test fixtures relies on manual positioning and bolt tightening. Each changeover requires the disassembly and reassembly of dozens of fasteners. In addition, it is necessary to manually plug and unplug the electrical component connectors of the upper and lower molds. As a result, the labor intensity is high, the changeover time is long, the changeover efficiency is low, and the normal operation of the production line is affected. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a quick-change test fixture and test machine, which can realize the rapid switching between the upper mold and the lower mold, greatly reducing the changeover time and improving the changeover efficiency. At the same time, the quick-connect male and quick-connect female heads are automatically pulled out or plugged in, which can avoid the trouble of manual plugging and unplugging.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A quick-change testing fixture includes a base plate, a lifting plate, an upper mold, and a lower mold. The lower mold is mounted on the base plate, and the upper mold is mounted on the lifting plate and located directly above the lower mold. A first floating pin plate is provided at the bottom of the upper mold, and a second floating pin plate is provided at the top of the lower mold. A quick-connect connector male is provided on the back of the lower mold, and a quick-connect connector female is provided on the base plate. The fixture is characterized by further comprising:

[0008] The first clamping mechanism is disposed on the lifting plate and includes a first guide component, a first limiting component and a locking component. The first guide component is used to guide the upper mold to enter, the first limiting component is used to limit the back of the upper mold, and the locking component is used to lock or unlock the upper mold.

[0009] The second clamping mechanism is disposed on the base plate and includes a second guide component, a rotary tensioning component, a second limiting component, and an ejection component. The second guide component is used to guide the lower mold into the base plate. The rotary tensioning component is used to clamp the lower mold and pull it back. The second limiting component is used to limit the back of the lower mold. The ejection component is used to eject the lower mold.

[0010] As a further improvement to the above technical solution, the upper mold is provided with first protrusions on both sides of the top, and the first guide assembly includes two parallel first L-shaped guide blocks. The two first L-shaped guide blocks are installed at the bottom of the lifting plate, and a first groove is formed between the first L-shaped guide blocks and the lifting plate for the first protrusions to be inserted.

[0011] As a further improvement to the above technical solution, the first limiting component includes a first support, a first limiting bolt disposed on the first support, and a first proximity switch. One end of the first limiting bolt is used to abut against the back of the upper mold for limiting.

[0012] As a further improvement to the above technical solution, the locking assembly includes a first pin and a first telescopic cylinder for driving the first pin to extend or retract. The first telescopic cylinder is installed on the top of the lifting plate. The first pin is vertically arranged. The lifting plate is provided with a through hole for the first pin to pass through. The top of the upper mold is provided with a first pin sleeve, which cooperates with the first pin.

[0013] As a further improvement to the above technical solution, a second protrusion is provided on both sides of the bottom of the lower mold, and the second guide component includes two parallel second L-shaped guide blocks. The two second L-shaped guide blocks are installed on the top of the base plate, and a second groove is formed between the second L-shaped guide blocks and the base plate for the second protrusion to be inserted.

[0014] As a further improvement to the above technical solution, the second limiting component includes a second support, a second limiting bolt disposed on the second support, and a second proximity switch. One end of the second limiting bolt is used to abut against the back of the lower mold for limiting.

[0015] As a further improvement to the above technical solution, the rotary tensioning assembly includes a third support, a rotary telescopic cylinder disposed on the third support, and a locking block disposed at the output end of the rotary telescopic cylinder. The rotary telescopic cylinder is used to drive the locking block to rotate and extend. The locking block has a cuboid structure. The back of the lower mold is provided with a rectangular hole that matches the locking block. The lower mold has an internal cavity. The quick-connect connector female head is connected to the base plate through a fourth support, which is located on one side of the third support.

[0016] As a further improvement to the above technical solution, the base plate is also provided with two photoelectric sensors. The two photoelectric sensors are respectively located at one end of the second L-shaped guide block near the rotating tensioning assembly. The photoelectric sensors are used to sense the position of the lower mold.

[0017] As a further improvement to the above technical solution, the ejection assembly includes a second telescopic cylinder and a push block, wherein the second telescopic cylinder is disposed on the third support and the push block is disposed at the telescopic end of the second telescopic cylinder.

[0018] A testing machine includes a machine base, a support, a lifting assembly, and a quick-change testing fixture as described in any one of the above, characterized in that the base plate is disposed on the machine base, the support is disposed on the base plate, the lifting assembly is disposed on the support, and the lifting assembly is used to drive the lifting plate to rise or fall.

[0019] The beneficial effects of this utility model are as follows: This utility model provides a quick-change test fixture and test machine. A first clamping mechanism is provided at the bottom of the lifting plate, and a second clamping mechanism is provided on the base plate. The first clamping mechanism is used to clamp the upper mold, and the second clamping mechanism is used to clamp the lower mold. When switching the upper mold, the old upper mold is first unlocked by the locking component, then the old upper mold is pulled out along the first guide component. Next, the new upper mold is pushed forward along the first guide component until the first limit component limits the back of the upper mold. Finally, the upper mold is locked to the bottom of the lifting plate by the locking component. When switching the lower mold, the old lower mold is first unlocked by rotating the tensioning assembly, and then the lower mold is pushed out by the ejection assembly. Simultaneously, the male and female quick-connect connectors on the back of the lower mold separate. Next, the old lower mold is pulled out along the second guide assembly, and then the new lower mold is pushed in along the second guide assembly. Then, the tensioning assembly is rotated to lock the lower mold and pull it back, with the back of the lower mold limited by the second limiting assembly. During the tensioning process, the male quick-connect connector on the back of the lower mold automatically engages with the female quick-connect connector on the base plate. This allows for rapid switching between the upper and lower molds, significantly reducing changeover time and improving efficiency. Furthermore, the automatic engagement and disengagement of the male and female quick-connect connectors avoids the inconvenience of manual insertion and removal. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a structural schematic diagram provided by an example of this utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle base plate and the lower mold;

[0023] Figure 3 yes Figure 2 Exploded view;

[0024] Figure 4 yes Figure 3 Another structural diagram from a different perspective;

[0025] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 yes Figure 1 Structural diagram of the middle support, lifting assembly, lifting plate and upper mold;

[0027] Figure 7 yes Figure 6 Enlarged view of point B in the middle;

[0028] Figure 8 yes Figure 6 A partial sectional view.

[0029] Figure label:

[0030] 1-Base plate, 11-Quick-connector female head, 12-Fourth support, 13-Second signal socket;

[0031] 2-Lifting plate, 21-Third telescopic cylinder, 22-First signal socket;

[0032] 3-Upper mold, 31-First floating pin plate, 32-First protrusion, 33-First pin sleeve, 34-First signal plug;

[0033] 4-Lower mold, 41-Second floating pin plate, 42-Quick connector male head, 43-Second protrusion, 44-Rectangular hole, 45-Second signal plug;

[0034] 5-First clamping mechanism, 51-First guide assembly, 511-First L-shaped guide block, 52-First limiting assembly, 521-First support, 522-First limiting bolt, 523-First proximity switch, 53-Locking assembly, 531-First pin, 532-First telescopic cylinder;

[0035] 6-Second clamping mechanism, 61-Second guide assembly, 611-Second L-shaped guide block, 62-Rotary tensioning assembly, 621-Third support, 622-Rotary telescopic cylinder, 623-Clamping block, 63-Second limit assembly, 631-Second support, 632-Second limit bolt, 633-Second proximity switch, 64-Ejection assembly, 641-Second telescopic cylinder, 642-Push block, 65-Photoelectric sensor;

[0036] 7-Staff;

[0037] 8-Lifting assembly. Detailed Implementation

[0038] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0039] Reference Figures 1 to 8 This utility model provides a quick-change test fixture, including a base plate 1, a lifting plate 2, an upper mold 3 and a lower mold 4. The lower mold 4 is installed on the base plate 1, the upper mold 3 is installed on the lifting plate 2 and located directly above the lower mold 4. A first floating pin plate 31 is provided at the bottom of the upper mold 3, a second floating pin plate 41 is provided at the top of the lower mold 4, a quick-connect connector male head 42 is provided on the back of the lower mold 4, and a quick-connect connector female head 11 is provided on the base plate 1. The quick-connect connector male head 42 and the quick-connect connector female head 11 are connected.

[0040] Furthermore, the bottom of the lifting plate 2 is provided with a first clamping mechanism 5. The first clamping mechanism 5 includes a first guide component 51, a first limiting component 52 and a locking component 53. The first guide component 51 is used to guide the upper mold 3 into the mold, the first limiting component 52 is used to limit the back of the upper mold 3, and the locking component 53 is used to lock or unlock the upper mold 3.

[0041] A second clamping mechanism 6 is provided on the base plate 1. The second clamping mechanism 6 includes a second guide component 61, a rotary tensioning component 62, a second limiting component 63, and an ejection component 64. The second guide component 61 is used to guide the lower mold 4 into the plate. The rotary tensioning component 62 is used to clamp the lower mold 4 and pull it back. The second limiting component 63 is used to limit the back of the lower mold 4. The ejection component 64 is used to eject the lower mold 4.

[0042] Understandably, when switching between different test fixtures, it is necessary to disassemble and install the upper mold 3 and the lower mold 4 separately.

[0043] When switching the upper mold 3, the old upper mold 3 is first unlocked by the locking component 53, then the old upper mold 3 is pulled out along the first guide component 51, and then the new upper mold 3 is pushed along the first guide component 51 until the first limit component 52 limits the back of the upper mold 3. Finally, the upper mold 3 is locked to the bottom of the lifting plate 2 by the locking component 53.

[0044] When switching the lower mold 4, the old lower mold 4 is first unlocked by rotating the tensioning component 62, and then the lower mold 4 is pushed out by the ejection component 64. At the same time, the quick-connect male head 42 on the back of the lower mold 4 is separated from the quick-connect female head 11. Then, the old lower mold 4 is pulled out along the second guide component 61. Then, the new lower mold 4 is pushed in along the second guide component 61. Next, the tensioning component 62 is rotated to lock the lower mold 4 and pull it back. The back of the lower mold 4 is limited by the second limiting component 63. At the same time, during the tightening process, the quick-connect male head 42 on the back of the lower mold 4 automatically plugs into the quick-connect female head 11 on the base plate 1.

[0045] Therefore, this utility model can realize the rapid switching between the upper mold 3 and the lower mold 4, greatly reducing the changeover time and improving the changeover efficiency. At the same time, the quick-connect connector male head 42 and the quick-connect connector female head 11 are automatically pulled out or plugged in, which can avoid the trouble of manual plugging and unplugging.

[0046] In some preferred embodiments, the upper mold 3 has a first protrusion 32 on both sides of the top, and the first guide component 51 includes two parallel first L-shaped guide blocks 511. The two first L-shaped guide blocks 511 are installed at the bottom of the lifting plate 2, and a first groove is formed between the first L-shaped guide blocks 511 and the lifting plate 2 for the first protrusion 32 to be inserted.

[0047] It is understandable that the first protrusions 32 on both sides of the upper mold 3 slide straight into the two first slide grooves, which can forcibly constrain the movement path of the upper mold 3 and prevent the upper mold 3 from deflecting and getting stuck. At the same time, the two first L-shaped guide blocks 511 provide symmetrical support force to the first protrusions 32 on both sides of the upper mold 3, preventing the upper mold 3 from detaching and improving the stability of the structure.

[0048] In some preferred embodiments, the first limiting component 52 includes a first support 521, a first limiting bolt 522 disposed on the first support 521, and a first proximity switch 523. One end of the first limiting bolt 522 is used to abut against the back of the upper mold 3 for limiting.

[0049] Understandably, the first protrusions 32 on both sides of the upper mold 3 slide straight into the two first sliding grooves until the back of the upper mold 3 abuts against one end of the first limiting bolt 522, ensuring the accurate positioning of the upper mold 3. At the same time, the back of the upper mold 3 triggers the first proximity switch 523, which transmits a signal to the locking component 53, which locks the upper mold 3.

[0050] Moreover, by rotating the first limiting bolt 522, it can be adapted to upper molds 3 of different specifications, thereby meeting the limiting requirements of different upper molds 3.

[0051] Specifically, there are two first limiting components 52. The two first limiting bolts 522 abut against the left and right parts of the back of the upper mold 3 respectively. The two first limiting bolts 522 can evenly distribute the impact load, reduce the force on a single first limiting bolt 522, and improve the service life.

[0052] Furthermore, the locking assembly 53 includes a first pin 531 and a first telescopic cylinder 532 for driving the first pin 531 to extend or retract. The first telescopic cylinder 532 is mounted on the top of the lifting plate 2. The first pin 531 is vertically arranged. The lifting plate 2 is provided with a through hole for the first pin 531 to pass through. The top of the upper mold 3 is provided with a first pin sleeve 33, which cooperates with the first pin 531.

[0053] It is understandable that by driving the first pin 531 to extend or retract through the first telescopic cylinder 532, the first pin 531 can be inserted into or removed from the first pin sleeve 33, thereby achieving the locking or unlocking of the upper mold 3. This method is highly automated, requires no manual operation, and improves the efficiency of mold changeover.

[0054] Specifically, the insertion end of the first pin 531 is provided with a first guide cone surface, which enables automatic correction. The first pin 531 and the first pin sleeve 33 are in clearance fit to avoid jamming caused by thermal expansion.

[0055] Furthermore, there are two locking components 53. Correspondingly, two first pin sleeves 33 are provided on the top of the upper mold 3. The two first pin sleeves 33 are symmetrically arranged along the central axis of the upper mold 3. The two first telescopic cylinders 532 simultaneously drive the first pins 531 to extend, so that the two first pins 531 are simultaneously inserted into the two first pin sleeves 33. Thus, the locking force is symmetrically distributed along the central axis of the upper mold 3, ensuring the stability of the locking.

[0056] In some preferred embodiments, the lower mold 4 has a second protrusion 43 on both sides of its bottom, and the second guide assembly 61 includes two parallel second L-shaped guide blocks 611. The two second L-shaped guide blocks 611 are mounted on the top of the base plate 1, and a second groove is formed between the second L-shaped guide blocks 611 and the base plate 1, into which the second protrusion 43 can be inserted.

[0057] Understandably, the second protrusions 43 on both sides of the lower mold 4 slide straight into the two second slide grooves, which can forcibly constrain the movement path of the lower mold 4 and prevent the lower mold 4 from deflecting and getting stuck.

[0058] Specifically, one end of the second slide groove has a second inclined guide portion. The inclined surface force of the second inclined guide portion automatically corrects the second protrusion 43, causing it to slide into the second slide groove along a fixed trajectory, thus ensuring the accurate positioning of the lower mold 4.

[0059] Furthermore, the second limiting component 63 includes a second support 631, a second limiting bolt 632 disposed on the second support 631, and a second proximity switch 633. One end of the second limiting bolt 632 is used to abut against the back of the lower mold 4 for limiting.

[0060] Understandably, the second protrusions 43 on both sides of the lower mold 4 slide straight into the two second slide grooves respectively. The rotating tensioning assembly 62 locks the lower mold 4 and pulls it back until the back of the lower mold 4 abuts against one end of the second limit bolt 632, ensuring the accurate positioning of the lower mold 4. At the same time, the back of the lower mold 4 triggers the second proximity switch 633, which transmits a signal to the rotating tensioning assembly 62, which keeps the lower mold 4 taut.

[0061] Furthermore, the rotary tensioning assembly 62 includes a third support 621, a rotary telescopic cylinder 622 disposed on the third support 621, and a locking block 623 disposed at the output end of the rotary telescopic cylinder 622. The rotary telescopic cylinder 622 is used to drive the locking block 623 to rotate and extend. The locking block 623 has a cuboid structure. The back of the lower mold 4 is provided with a rectangular hole 44 that matches the locking block 623. The lower mold 4 has an internal cavity. The quick-connect connector female head 11 is connected to the base plate 1 through a fourth support 12. The fourth support 12 is located on one side of the third support 621.

[0062] Understandably, the second protrusions 43 on both sides of the lower mold 4 slide straight in along the two second slide grooves until the locking block 623 enters the inner cavity of the lower mold 4 through the rectangular hole 44. The rotary telescopic cylinder 622 drives the locking block 623 to rotate 90°, so that the locking block 623 hooks onto the inner wall of the lower mold 4. Then, the rotary telescopic cylinder 622 drives the locking block 623 to retract, thereby tightening the lower mold 4, so that the quick-connect connector male head 42 on the back of the lower mold 4 is connected to the quick-connect connector female head 11. Thus, mechanical locking and electrical connection can be carried out simultaneously, greatly improving the changeover efficiency.

[0063] Specifically, there are two rotary tensioning components 62, two third supports 621 are symmetrically arranged around the center of the fourth support 12, the quick-connect connector male head 42 is located at the center of the back of the lower mold 4, and there are two rectangular holes 44 symmetrically arranged around the center of the back of the lower mold 4. After the two locking blocks 623 simultaneously enter the two rectangular holes 44, the two rotary telescopic cylinders 622 drive the two locking blocks 623 to rotate 90° respectively, so that the two locking blocks 623 hook onto the inner wall of the lower mold 4. Then, the two rotary telescopic cylinders 622 drive the two locking blocks 623 to retract, thereby tightening the lower mold 4. Therefore, the tension on both sides can be balanced in real time, so that the lower mold 4 is subjected to uniform force, ensuring that the quick-connect connector male head 42 is inserted into the quick-connect connector female head 11 with zero off-center load.

[0064] Furthermore, the base plate 1 is also provided with two photoelectric sensors 65. The two photoelectric sensors 65 are located at one end of the second L-shaped guide block 611 near the rotating tensioning assembly 62. The photoelectric sensors 65 are used to sense the position of the lower mold 4.

[0065] Understandably, when the lower mold 4 moves to the position corresponding to the photoelectric sensor 65, the two locking blocks 623 enter the two rectangular holes 44. The photoelectric sensor 65 transmits a signal to the two rotary telescopic cylinders 622. The two rotary telescopic cylinders 622 drive the two locking blocks 623 to rotate 90° respectively, so that the two locking blocks 623 hook onto the inner wall of the lower mold 4. Then, the two rotary telescopic cylinders 622 drive the two locking blocks 623 to retract, thereby tightening the lower mold 4.

[0066] In some preferred embodiments, the ejection assembly 64 includes a second telescopic cylinder 641 and a push block 642. The second telescopic cylinder 641 is disposed on the third support 621, and the push block 642 is disposed at the telescopic end of the second telescopic cylinder 641.

[0067] Specifically, there are two launch components 64, and the two telescopic cylinders are respectively mounted on the two third supports 621.

[0068] Understandably, when the lower mold 4 needs to be replaced, the two rotary telescopic cylinders 622 drive the two locking blocks 623 to rotate 90° respectively, so that the two locking blocks 623 match the rectangular hole 44. Then, the two second telescopic cylinders 641 drive the two push blocks 642 to extend. The two push blocks 642 push the old lower mold 4 forward, and at the same time, the quick-connect connector male head 42 is pulled out of the quick-connect connector female head 11. Finally, the old lower mold 4 is manually pulled out.

[0069] In some preferred embodiments, a first signal plug 34 is provided on the back of the upper mold 3. The first signal plug 34 is electrically connected to the first floating pin plate 31. A third telescopic cylinder 21 is provided on the lifting plate 2. The telescopic end of the third telescopic cylinder 21 is connected to the first signal socket 22. When the back of the upper mold 3 abuts against one end of the first limiting bolt 522, the third telescopic cylinder 21 extends to drive the first signal socket 22 to connect with the first signal plug 34, thereby achieving signal communication.

[0070] The back of the lower mold 4 is provided with a second signal plug 45, which is electrically connected to the second floating pin plate 41. The third support 621 is provided with a second signal socket 13. When the back of the lower mold 4 abuts against one end of the second limiting bolt 632, the second signal plug 45 and the second signal socket 13 are connected to achieve signal communication.

[0071] When testing the PCB board, the PCB board is placed on the second floating pin plate 41 of the lower mold 4. Then, the lifting plate 2 descends, so that the first floating pin plate 31 of the upper mold 3 contacts the PCB board, thereby enabling the conduction between the first floating pin plate 31, the PCB board, and the second floating pin plate 41, and thus enabling the PCB board to be tested.

[0072] An embodiment of this utility model also provides a testing machine, including a machine base (not shown in the attached drawings), a support 7, a lifting assembly 8, and a quick-change testing fixture as described in any of the above. The base plate 1 is mounted on the machine base, the support 7 is mounted on the base plate 1, and the lifting assembly 8 is mounted on the support 7. The lifting assembly 8 is used to drive the lifting plate 2 to rise or fall.

[0073] Understandably, when testing the PCB board, the PCB board is placed on the second floating pin plate 41 of the lower mold 4. Then, the lifting plate 2 is driven down by the lifting assembly 8. The lifting plate 2 moves the upper mold 3 closer to the lower mold 4, so that the first floating pin plate 31 of the upper mold 3 contacts the PCB board. Finally, the PCB board is tested.

[0074] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A quick-change testing fixture, comprising a base plate, a lifting plate, an upper mold, and a lower mold, wherein the lower mold is mounted on the base plate, the upper mold is mounted on the lifting plate and located directly above the lower mold, a first floating pin plate is provided at the bottom of the upper mold, a second floating pin plate is provided at the top of the lower mold, a quick-connect connector male head is provided on the back of the lower mold, and a quick-connect connector female head is provided on the base plate, characterized in that... Also includes: The first clamping mechanism is disposed on the lifting plate and includes a first guide component, a first limiting component and a locking component. The first guide component is used to guide the upper mold to enter, the first limiting component is used to limit the back of the upper mold, and the locking component is used to lock or unlock the upper mold. The second clamping mechanism is disposed on the base plate and includes a second guide component, a rotary tensioning component, a second limiting component, and an ejection component. The second guide component is used to guide the lower mold into the base plate. The rotary tensioning component is used to clamp the lower mold and pull it back. The second limiting component is used to limit the back of the lower mold. The ejection component is used to eject the lower mold.

2. The quick-change testing fixture according to claim 1, characterized in that, The upper mold has a first protrusion on both sides of its top. The first guide assembly includes two parallel first L-shaped guide blocks. The two first L-shaped guide blocks are installed at the bottom of the lifting plate. A first groove is formed between the first L-shaped guide blocks and the lifting plate, allowing the first protrusion to be inserted.

3. The quick-change testing fixture according to claim 1, characterized in that, The first limiting component includes a first support, a first limiting bolt disposed on the first support, and a first proximity switch. One end of the first limiting bolt is used to abut against the back of the upper mold for limiting.

4. The quick-change testing fixture according to claim 1, characterized in that, The locking assembly includes a first pin and a first telescopic cylinder for driving the first pin to extend or retract. The first telescopic cylinder is mounted on the top of the lifting plate. The first pin is vertically arranged. The lifting plate is provided with a through hole for the first pin to pass through. The top of the upper mold is provided with a first pin sleeve, which cooperates with the first pin.

5. A quick-change testing fixture according to claim 1, characterized in that, The lower mold has a second protrusion on both sides of its bottom. The second guide assembly includes two parallel second L-shaped guide blocks. The two second L-shaped guide blocks are installed on the top of the base plate. A second groove is formed between the second L-shaped guide blocks and the base plate, allowing the second protrusion to be inserted.

6. A quick-change testing fixture according to claim 1, characterized in that, The second limiting component includes a second support, a second limiting bolt disposed on the second support, and a second proximity switch. One end of the second limiting bolt is used to abut against the back of the lower mold for limiting.

7. A quick-change testing fixture according to claim 1, characterized in that, The rotary tensioning assembly includes a third support, a rotary telescopic cylinder mounted on the third support, and a locking block mounted on the output end of the rotary telescopic cylinder. The rotary telescopic cylinder is used to drive the locking block to rotate and extend. The locking block has a cuboid structure. The back of the lower mold is provided with a rectangular hole that matches the locking block. The lower mold has an internal cavity. The quick-connect connector female head is connected to the base plate through a fourth support, which is located on one side of the third support.

8. A quick-change testing fixture according to claim 5, characterized in that, The base plate is also provided with two photoelectric sensors, which are located at one end of the second L-shaped guide block near the rotating tensioning assembly. The photoelectric sensors are used to sense the position of the lower mold.

9. A quick-change testing fixture according to claim 7, characterized in that, The ejection assembly includes a second telescopic cylinder and a push block. The second telescopic cylinder is mounted on the third support, and the push block is mounted on the telescopic end of the second telescopic cylinder.

10. A testing machine, comprising a machine base, a support frame, a lifting assembly, and a quick-change testing fixture as described in any one of claims 1 to 9, characterized in that, The base plate is mounted on the machine platform, the bracket is mounted on the base plate, and the lifting assembly is mounted on the bracket. The lifting assembly is used to drive the lifting plate to rise or fall.

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