A test device and method for connecting shank load bearing capacity

Abstract

The application provides a test device for connecting handle bearing force, comprising a pressing tool, a pressing component, a connecting handle arranged between the pressing tool and the pressing component, the connecting handle comprising a central cylinder abutting against the pressing tool and a plurality of fingers abutting against the pressing component, the pressing component comprising a plurality of pressing detection assemblies, each of the plurality of pressing detection assemblies detecting the bearing force of each of the plurality of fingers, so that each pressing detection assembly can detect the bearing force of each finger independently, and the pressing component can simultaneously provide the plurality of fingers with bearing force and can simultaneously measure the bearing force of the plurality of fingers; the test device further comprises a gas-liquid transmission mechanism and a control device, the gas-liquid transmission mechanism being connected with the plurality of pressing detection assemblies, and transmitting pressure to the plurality of fingers through the plurality of pressing detection assemblies, so that the test device can simultaneously pressurize the plurality of fingers; the control device can simultaneously collect the bearing force of the plurality of fingers, can display the bearing force of the plurality of fingers in real time, and can give a warning for abnormal bearing force.

Description

Technical Field

[0001] This invention relates to the field of testing the load-bearing capacity of connecting handles, and more specifically, to a testing apparatus and method for testing the load-bearing capacity of connecting handles. Background Technology

[0002] As a structural component of the control rod assembly, the connecting handle assembly comprises three parts: a central cylinder, radial flanges, and finger rods. The central cylinder and radial flanges are integrated, and the finger rods are welded to the radial flanges. To test the welding strength of the finger rods, a test device for the load-bearing capacity of the connecting handle needs to be designed.

[0003] The current method for testing the load-bearing capacity of the connecting handle is manual pressure testing. This method can only test the force on one finger at a time and provide a test value. Furthermore, due to the dimensional deviation between the standard connecting handle and the actual test sample, it is difficult to ensure that the uniformity test performed on the standard connecting handle is applicable to the actual test sample. In addition, since only the force value of one finger can be provided at a time, it is necessary to repeat the test 16 times to complete the test of one connecting handle component, which is inefficient. Moreover, since the technical specifications have strict requirements for the uniformity of force on each finger, this testing method cannot display the force on each finger in real time, and cannot determine whether some fingers are out of tolerance during the test.

[0004] In view of the above technical problems, this invention is hereby introduced. Summary of the Invention

[0005] The main objective of this invention is to provide a digital display testing device for testing the load-bearing capacity of a connecting handle, so as to achieve simultaneous automatic measurement of the load-bearing capacity of multiple fingers of the connecting handle.

[0006] To achieve the above objectives, the present invention provides a testing device for the load-bearing capacity of a connecting handle. The testing device includes a pressing fixture and a pressing component. The pressing fixture and the pressing component are fixedly connected. The connecting handle is disposed between the pressing fixture and the pressing component. The connecting handle includes a central cylinder that abuts against the pressing fixture and multiple finger rods that abut against the pressing component. The pressing component includes multiple pressing detection components, which respectively detect the load-bearing capacity of the multiple finger rods, so that each pressing detection component can independently detect the load-bearing capacity of each finger rod. Moreover, the pressing component can simultaneously provide load-bearing capacity to multiple finger rods and can simultaneously measure the load-bearing capacity of multiple finger rods. The testing device also includes a pneumatic-hydraulic transmission mechanism and a control device. The pneumatic-hydraulic transmission mechanism is connected to the multiple pressing detection components and transmits pressure to the multiple finger rods through the multiple pressing detection components, so that the testing device can simultaneously pressurize multiple finger rods. The control device can simultaneously collect the load-bearing capacity of multiple finger rods, can display the load-bearing capacity of multiple finger rods in real time, and provide early warning for abnormal load-bearing capacity.

[0007] The following are further optimizations of the above solution by the present invention:

[0008] Furthermore, the pressure-pressuring component also includes multiple pressure regulating mechanisms, which adjust multiple pressure-pressuring detection components respectively, so that each pressure regulating mechanism can individually adjust the pressure value of each pressure-pressuring detection component.

[0009] Furthermore, the pressure regulating mechanism includes a first pressure regulating mechanism and a second pressure regulating mechanism, which have different lengths to connect with pressure detection components at different locations.

[0010] Furthermore, the pressure testing component includes a lower support pad, a pressure sensor, an upper support pad, and a hydraulic cylinder. The pressure sensor is located between the lower and upper support pads. The lower support pad abuts against the hydraulic cylinder, and the upper support pad contacts the finger rod.

[0011] Furthermore, the pressing component also includes a lower positioning plate, an upper guide plate, and a lower guide plate. The upper guide plate is equipped with an upper support pad, the lower guide plate is equipped with a lower support pad, and the lower positioning plate is provided with an oil supply channel to supply oil to multiple oil cylinders.

[0012] Furthermore, the pressure adjustment mechanism includes an ear seat, a pressure plate connected to the ear seat, a force adjustment screw, and a compression spring. The ear seat is connected to the lower guide plate, the pressure plate is connected to the pressure sensor, and the force adjustment screw is inserted into the compression spring. By adjusting the force adjustment screw, the force of the compression spring is adjusted, thereby adjusting the load-bearing capacity of the finger rod.

[0013] Furthermore, the pneumatic-hydraulic transmission mechanism uses a pneumatic source as the driving energy and a hydraulic cylinder as the actuator to pressurize multiple finger levers.

[0014] Furthermore, the pneumatic-hydraulic transmission mechanism includes a pneumatic-hydraulic booster to pressurize the hydraulic cylinder, thereby enabling the pressing of multiple finger levers.

[0015] Furthermore, the control device collects pressure from multiple pressure sensors, and the control device also includes a display device that displays the pressure from the multiple pressure sensors.

[0016] Furthermore, the testing apparatus also includes a support frame that supports the pressing components and the display device.

[0017] Furthermore, the pressing tooling is a gantry frame.

[0018] Furthermore, the gantry frame abuts against the center tube, and a total pressure sensor is installed between the center tube and the gantry frame. The total pressure sensor is used to detect the total pressure value of multiple finger rods.

[0019] Furthermore, there are 16 finger stalks, 16 pressure detection components, and 16 pressure sensors, so that each finger stalk is equipped with one pressure detection component.

[0020] According to another aspect of the present invention, a method for testing the load-bearing capacity of a connecting handle is also provided, employing the testing apparatus described in any of the above claims, comprising the following steps:

[0021] Preparation step S1: In preparation step S1, fix the connecting handle between the pressurizing component and the gantry frame, and zero the pressure of the total pressure sensor and the partial pressure sensor.

[0022] Step S2: Connect the gas source and initially adjust the gas pressure;

[0023] Gas-liquid booster start-up step S3: Start the gas-liquid booster to pressurize the oil cylinder so that the oil pressure reaches a fixed value, wherein the total pressure sensor is loaded to 2254daN±1daN;

[0024] Pressure holding step S4: Hold pressure for at least 60 seconds, and analyze 16 partial pressure sensors simultaneously. The requirement is that the force on the 16 fingers is uniformly applied with an error of 140.87 ± 4.5 daN.

[0025] Pressure data display step S5: The digital display device displays the pressure data and issues an early warning for abnormal load-bearing capacity;

[0026] End of step S6: Retract the gas-liquid inflator and remove the connecting handle.

[0027] By applying the technical solution of this invention, at least the following beneficial effects are achieved:

[0028] 1. This invention enables the connection handle load-bearing capacity testing device to perform one-time automatic testing, reducing product testing time, avoiding repetition, and allowing the device to read 16 sets of data at once, greatly improving testing efficiency.

[0029] 2. This invention can intuitively display whether the pressure value is uniform: through program settings, the pressure values ​​of all 16 finger rods can be displayed on the screen, and the pressure values ​​that exceed the tolerance can be directly displayed. It can also display the test results in real time and make a qualified judgment. Attached Figure Description

[0030] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1A schematic diagram of the structure of the digital display test device for the load-bearing capacity of the connecting handle is shown;

[0032] Figure 2 A schematic diagram of the pressing fixture and pressing components is shown;

[0033] Figure 3 A schematic diagram of the pressing component is shown;

[0034] Figure 4 A schematic diagram of the pressure testing component is shown.

[0035] Figure 5 A schematic diagram of the pressing tool is shown;

[0036] Figure 6 A schematic diagram of the pressure regulating mechanism is shown.

[0037] The above figures include the following reference numerals:

[0038] 1. Pressing fixture; 2. Connecting handle; 3. Center cylinder; 4. Finger rod;

[0039] 5. Pressing components; 6. Support frame; 7. Display device;

[0040] 11. Crossbeam; 12. Column; 13. Pressure head; 14. Top block; 15. Rotary shaft bolt;

[0041] 51. Pressure testing assembly; 52. Pressure regulating mechanism;

[0042] 511. Lower support pad; 512. Pressure sensor; 513. Upper support pad; 514. Top head; 515. Hydraulic cylinder;

[0043] 521. Ear seat; 522. Pressure plate; 523. Force adjusting screw; 524. Compression spring; 525. Fastening screw; 526. Elastic washer; 527. Pressure ring;

[0044] 53. Lower positioning plate; 54. Upper guide plate; 55. Lower guide plate. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features. The terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] This invention provides a digital display testing device for testing the load-bearing capacity of a connecting handle, thereby achieving automatic measurement of the connecting handle's load-bearing capacity. By adding a pneumatic-hydraulic transmission mechanism, the device can automatically apply pressure to 16 finger rods 4 simultaneously; by adding sensors, the device can read the force conditions of all 16 finger rods 4 and the connecting handle 2 component at once; through program settings, the pressure values ​​of all 16 finger rods 4 and the connecting handle 2 component can be displayed on the screen, and out-of-tolerance pressure values ​​can be directly displayed.

[0049] like Figures 1-5As shown, a digital display testing device for the load-bearing capacity of a connecting handle 2 is provided. The testing device includes a pressing fixture 1 and a pressing component 5. The pressing fixture 1 and the pressing component 5 are fixedly connected. The connecting handle 2 is disposed between the pressing fixture 1 and the pressing component 5. The connecting handle 2 includes a central cylinder 3 that abuts against the pressing fixture 1 and multiple finger rods 4 that abut against the pressing component 5. The pressing component 5 includes multiple pressing detection components 51, which respectively detect the load-bearing capacity of the multiple finger rods 4, so that each pressing detection component 51 can independently detect the load-bearing capacity of each finger rod 4. Moreover, the pressing component 5 can simultaneously provide load-bearing capacity to multiple finger rods 4 and can simultaneously measure the load-bearing capacity of multiple finger rods 4. The testing device also includes a pneumatic-hydraulic transmission mechanism and a control device. The pneumatic-hydraulic transmission mechanism is connected to multiple pressure testing components 51, which transmit pressure to multiple finger rods 4, allowing the testing device to pressurize multiple finger rods 4 simultaneously. The control device can simultaneously collect the load-bearing capacity of multiple finger rods 4, display the load-bearing capacity of multiple finger rods 4 in real time, and provide early warning for abnormal load-bearing capacity.

[0050] Since the connecting handle 2 includes 16 fingers 4, the aforementioned plurality of pressure detection components 51 are preferably 16 pressure detection components 51.

[0051] The automatic one-time testing of the connecting handle load-bearing capacity testing equipment reduces product testing time and avoids repetition. It eliminates the need for 16 repeated measurements by adding sensors, enabling the equipment to read 16 sets of data simultaneously, significantly improving testing efficiency. Furthermore, it allows all the pressure values ​​applied to the 16 finger rods to be displayed on the screen, and provides early warnings for out-of-tolerance pressure values, such as highlighting out-of-tolerance values ​​in red. It can also simultaneously display the test results in real time and make a pass / fail judgment.

[0052] The test apparatus for testing the load-bearing capacity of the connecting handle also includes a support frame 6, which supports the pressing component 5 and the display device 7. The profile frame is constructed of high-strength aluminum profiles and connected using matching connectors. The bottom of the profile frame is equipped with height-adjustable feet and feet that can be fixed to the ground, facilitating overall height adjustment and fixation. A stainless steel plate is installed on the top of the profile frame as the operating surface to ensure rust prevention and sufficient strength.

[0053] The pressure testing component 5 is positioned above the support frame 6 and mainly consists of a lower positioning plate 53, a pressure testing assembly 51, an upper guide plate 54, and a lower guide plate 55. The pressure testing assembly 51 includes a lower support pad 511, a pressure sensor 512, an upper support pad 513, a top head 514, and a hydraulic cylinder 515. The pressure sensor is located between the lower support pad 511 and the upper support pad 513. The lower support pad 511 abuts against the top head 514, receiving pressure from the hydraulic cylinder 515 through the top head 514. The upper support pad 513 contacts the bottom of the finger rod 4, providing positioning and support. The entire assembly can be directly removed from the top of the hydraulic cylinder 515 for convenient periodic inspection and disassembly.

[0054] The lower guide plate 55 of the pressurizing component 5 is equipped with a lower support pad 511. The lower positioning plate 53 is provided with an oil supply channel to supply oil to multiple oil cylinders 515. Moreover, the oil circuits of all oil cylinders 515 are connected, and the oil circuit input end is connected to the outlet of the gas-liquid booster, which provides pressure uniformly.

[0055] The pressure-pressuring component 5 also includes multiple pressure regulating mechanisms 52, which adjust multiple pressure-pressuring detection components 51 respectively, so that each pressure regulating mechanism 52 can individually adjust the pressure value of each pressure-pressuring detection component 51. There are 16 pressure regulating mechanisms 52, so that each pressure-pressuring detection component 51 is equipped with one pressure regulating mechanism 52.

[0056] Among them, such as Figure 2 As shown, there are 16 connecting handle fingers, 16 pressure detection components 51, and 16 corresponding pressure sensors 512.

[0057] like Figure 6 As shown, the pressure adjustment mechanism 52 includes an ear seat 521, a pressure plate 522 connected to the ear seat 521, a force adjustment screw 523, and a compression spring 524. The ear seat 521 is connected to the lower guide plate 55 via a fastening screw 525 and an elastic washer 526. The pressure plate 522 is connected to the pressure sensor 512. The force adjustment screw 523 is fitted into the compression spring 524, and the force of the compression spring 524 is adjusted by adjusting the force of the force adjustment screw 523, thereby adjusting the load-bearing capacity of the finger rod 4. A pressure ring 527 is provided below the adjusting compression spring 524, and the force of the compression spring 524 is transmitted to the pressure plate 522 through the pressure ring 527.

[0058] The pressure regulating mechanism 52 sets different lengths of the pressure plate 522 according to the position of the finger rod 4, and connects the first pressure regulating mechanism and the second pressure regulating mechanism of the pressure regulating mechanism 52 to the pressure detection component 51 at different positions according to the different lengths.

[0059] The pneumatic-hydraulic transmission mechanism uses air as the driving energy source and hydraulic cylinders 515 as the actuators. Pressure is increased by a pneumatic-hydraulic booster to pressurize 16 finger levers 4. All 16 pressing hydraulic cylinders 515 are of the same specification and model, and their oil circuits are interconnected. Using the formula F=PS, the output force F of each cylinder 515 is consistent, achieving uniform pressure. The pneumatic-hydraulic transmission mechanism also includes a pneumatic-hydraulic booster to pressurize the cylinders 515, thereby pressurizing multiple finger levers 4. A precision pressure regulating valve and air tank in the air source pipeline achieve precise pressure regulation and stabilization. The pneumatic-hydraulic transmission mechanism can output pressure to all 16 hydraulic cylinders 515 via a single pneumatic-hydraulic booster, or each hydraulic cylinder 515 can be equipped with its own pneumatic-hydraulic booster for independent pressure control.

[0060] The control device collects pressure data from multiple pressure sensors and displays the pressure data on display device 7. The control device is integrated with the equipment body, using a PLC as the main control unit to achieve centralized control of various parts of the equipment and the acquisition of equipment parameters. The touchscreen displays operation and monitoring functions such as setting up operation, parameter settings, abnormal alarms, and input / output status checks. An emergency stop button is located on the equipment operation panel; pressing the button triggers an audible and visual alarm, and the corresponding button information is displayed on the operation interface. Equipment parameters such as air source pressure, hydraulic oil pressure, and pressure from each sensor can be collected, centrally displayed, and controlled by the PLC, and can be set via the human-machine interface. All exposed live wiring terminals in the equipment or control cabinet are insulated with transparent acrylic glass or other equivalent measures. The electrical control cabinet is equipped with a panel-operated main power switch, a main power indicator light, and a prominent emergency stop button; each control circuit is equipped with a circuit breaker. A three-color indicator light and an audible alarm are provided to indicate the equipment's operating status.

[0061] The pressure-pressing fixture 1 is a gantry frame. The gantry frame abuts against the central cylinder 3. A total pressure sensor is installed between the central cylinder 3 and the gantry frame. The total pressure sensor detects the total pressure value of the 16 finger rods 4, i.e., it detects the total load-bearing capacity of the entire connecting handle. The gantry frame functions to counteract the pressing reaction force of the finger rods 4 and detect the total loading pressure. The gantry frame includes two columns 12 and a crossbeam 11. The crossbeam 11 is connected to the two columns 12 by pivot bolts 15. It is made of stainless steel and heat-treated to ensure its strength meets usage requirements. A pressure head 13 is installed below the crossbeam 11. The total pressure sensor and pressure head 13 are installed at the lower part of the gantry frame crossbeam 11 for real-time detection of the total pressure value. When installing the connecting handle 2, a large top block 14 is placed on the connecting handle 2.

[0062] This invention provides a method for testing the load-bearing capacity of a connecting handle, using the aforementioned testing apparatus, and comprising the following steps:

[0063] Preparation step S1: In preparation step S1, fix the connecting handle 2 between the pressurizing component 5 and the gantry frame, and zero the pressure of the total pressure sensor and the partial pressure sensor 512.

[0064] Step S2: Connect the gas source and initially adjust the gas pressure;

[0065] Gas-liquid booster start-up step S3: Start the gas-liquid booster to pressurize the cylinder 515 so that the oil pressure reaches a fixed value, wherein the total pressure sensor is loaded to 2254daN±1daN; wherein, the gas-liquid booster outputs oil pressure to lift 16 cylinders 515 simultaneously, and the partial pressure sensor 512 on each pressure detection component 51 holds against the 16 finger rods 4 of the connecting handle 2 through the upper support pad 513.

[0066] Pressure holding step S4: When the total pressure is applied to 2254daN±1daN, the pressure is held for at least 60 seconds. At the same time, the 16 partial pressure sensors 512 are analyzed, and the uniform force error of the 16 finger rods 4 is required to be 140.87±4.5daN.

[0067] Pressure data display step S5: The digital display device displays the pressure data and issues an early warning for abnormal load capacity; the digital display device displays 17 pressure values, including the values ​​of 16 partial pressure sensors 512 and the value of 1 total pressure sensor. It can directly display out-of-tolerance pressure values, such as pressure values ​​exceeding the average value by ±4.5 daN, through alarms, red highlighting, or other methods.

[0068] End of step S6: Retract the gas-liquid inflator and remove connecting handle 2.

[0069] In summary, it can be seen from the above description that the embodiments of the present invention achieve the following technical effects:

[0070] 1. This invention enables the connection handle load-bearing capacity testing device to perform one-time automatic testing, reducing product testing time, avoiding repetition, and allowing the device to read 16 sets of data at once, greatly improving testing efficiency.

[0071] 2. This invention can intuitively display whether the pressure value is uniform: through program settings, the pressure values ​​of all 16 finger rods 4 can be displayed on the screen, and the pressure values ​​that exceed the tolerance can be directly displayed. It can also display the test results in real time and make a qualified judgment.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A testing device for the load-bearing capacity of a connecting handle, the testing device comprising a pressing fixture (1) and a pressing component (5), the pressing fixture (1) being fixedly connected to the pressing component (5), the connecting handle (2) being disposed between the pressing fixture (1) and the pressing component (5), the connecting handle (2) comprising a central cylinder (3) abutting against the pressing fixture (1) and a plurality of finger rods (4) abutting against the pressing component (5). Its features are: The pressure-pressing component (5) includes multiple pressure-pressing detection components (51), which respectively detect the load-bearing capacity of multiple finger rods (4), so that each pressure-pressing detection component (51) can individually detect the load-bearing capacity of each finger rod (4), and the pressure-pressing component (5) can simultaneously provide load-bearing capacity to multiple finger rods (4) and simultaneously measure the load-bearing capacity of multiple finger rods (4); The test device also includes a gas-hydraulic transmission mechanism and a control device. The gas-hydraulic transmission mechanism is connected to multiple pressure testing components (51) and transmits pressure to multiple finger rods (4) through multiple pressure testing components (51), so that the test device can pressurize multiple finger rods (4) at the same time. The control device can collect the bearing capacity of multiple finger rods (4) at the same time, and can display the bearing capacity of multiple finger rods (4) in real time, and provide early warning for abnormal bearing capacity.

2. The experimental apparatus according to claim 1, characterized in that: The pressure-pressing component (5) also includes multiple pressure-regulating mechanisms (52), which adjust multiple pressure-pressing detection components (51) respectively, so that each pressure-regulating mechanism (52) can adjust the pressure value of each pressure-pressing detection component (51) individually.

3. The experimental apparatus according to claim 2, characterized in that: The pressure regulating mechanism (52) includes a first pressure regulating mechanism and a second pressure regulating mechanism, the first pressure regulating mechanism and the second pressure regulating mechanism having different lengths to connect to the pressure detection assembly (51) at different locations.

4. The test apparatus according to claim 3, characterized in that: The pressure testing assembly (51) includes a lower support pad (511), a partial pressure sensor (512), an upper support pad (513), and a hydraulic cylinder (515). The partial pressure sensor (512) is located between the lower support pad (511) and the upper support pad (513). The lower support pad (511) abuts against the hydraulic cylinder (515), and the upper support pad (513) contacts the finger rod (4).

5. The test apparatus according to claim 4, characterized in that: The pressing component (5) further includes a lower positioning plate (53), an upper guide plate (54) and a lower guide plate (55). The upper guide plate (54) is equipped with the upper support pad (513), and the lower guide plate (55) is equipped with the lower support pad (511). The lower positioning plate (53) is provided with an oil supply channel to supply oil to the multiple oil cylinders (515).

6. The test apparatus according to claim 5, characterized in that: The pressure adjustment mechanism (52) includes an ear seat (521), a pressure plate (522) connected to the ear seat (521), a force adjustment screw (523), and a compression spring (524). The ear seat (521) is connected to the lower guide plate (55), the pressure plate (522) is connected to the pressure sensor (512), and the force adjustment screw (523) is fitted into the compression spring (524). By adjusting the force adjustment screw (523), the force of the compression spring (524) is adjusted, thereby adjusting the bearing capacity of the finger rod (4).

7. The test apparatus according to claim 6, characterized in that: The pneumatic-hydraulic transmission mechanism uses a pneumatic source as the driving energy and the oil cylinder (515) as the actuating element to press down on the multiple finger rods (4).

8. The test apparatus according to claim 7, characterized in that: The pneumatic-hydraulic transmission mechanism includes a pneumatic-hydraulic booster to pressurize the cylinder (515) to pressurize the plurality of finger rods (4).

9. The test apparatus according to claim 8, characterized in that: The control device collects the pressure of multiple partial pressure sensors (512), and the control device also includes a display device (7) that displays the pressure of multiple partial pressure sensors (512).

10. The test apparatus according to claim 9, characterized in that: The test apparatus also includes a support frame (6) that supports the pressing component (5) and the display device (7).

11. The test apparatus according to claim 10, characterized in that: The pressing fixture (1) is a gantry frame.

12. The test apparatus according to claim 11, characterized in that: The gantry frame abuts against the central cylinder (3), and a total pressure sensor is provided between the central cylinder (3) and the gantry frame. The total pressure sensor is used to detect the total pressure value of the multiple finger rods (4).

13. The test apparatus according to claim 12, characterized in that: The plurality of finger levers (4) are 16 finger levers (4), the plurality of pressure detection components (51) are 16 pressure detection components (51), and the plurality of partial pressure sensors (512) are 16 partial pressure sensors (512), such that each finger lever (4) is equipped with one pressure detection component (51).

14. A method for testing the load-bearing capacity of a connecting handle, using the testing apparatus according to any one of claims 12-13, characterized in that: Includes the following steps: Preparation step S1: In the preparation step S1, the connecting handle (2) is fixed between the pressurizing component (5) and the gantry frame, and the pressure of the total pressure sensor and the partial pressure sensor (512) is zeroed. Step S2: Connect the gas source and initially adjust the gas pressure; Gas-liquid booster start-up step S3: Start the gas-liquid booster to pressurize the oil cylinder (515) so that the oil pressure reaches a fixed value, wherein the total pressure sensor is loaded to 2254daN±1daN; Pressure holding step S4: Hold pressure for at least 60 seconds, and analyze the 16 partial pressure sensors (512) at the same time. The 16 finger rods (4) are required to have a uniform force error of 140.87 ± 4.5 daN. Pressure data display step S5: The digital display device displays the pressure data and issues an early warning for abnormal load-bearing capacity; End of step S6: Retract the gas-liquid inflator and remove the connecting handle (2).

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