Goods hook tension testing device

Abstract

The utility model relates to the field of tension testing devices, and discloses a cargo hook tension testing device which comprises a connector used for connecting a hanging rod of an auxiliary hanger, a connecting frame connected with the connector, two connecting blocks installed on the two sides of the lower end of the connecting frame and a cargo hook body installed at the lower ends of the two connecting blocks and used for load testing. The connector comprises an upper column block and a lower column body fixed to the lower end of the upper column block, a connecting groove is formed in the front end face of the upper column block, a fixing pin is inserted into the connecting groove to be connected with the lower end of the hanging rod in a hanging mode, the two connecting blocks each comprise an H-shaped block, and the goods hook body comprises a shell and a hook body installed on one side of the lower end of the interior of the shell. A housing is mounted on the front end face of the shell through bolts. According to the utility model, the pulling force for pulling the cargo hook body can be rapidly tested, a breaking protection mechanism is provided, the problem of effective inhibition of inertia rebound is solved, mechanism equipment cannot be damaged, and personnel safety is ensured.

Description

Technical Field

[0001] This utility model relates to the field of tensile testing devices, and in particular to a cargo hook tensile testing device. Background Technology

[0002] The helicopter cargo hook is a core load-bearing component for external sling load operations, directly impacting the safety of personnel, cargo, and the aircraft itself. Its failure could lead to catastrophic consequences (cargo falling, helicopter loss of control). Overhaul is a critical process for restoring the cargo hook to "zero-hour" condition or meeting specific service standards. The testing phase during overhaul, particularly load testing and functional testing, is the final and most crucial step in verifying whether the cargo hook's structural integrity, mechanical performance, and reliability meet airworthiness requirements.

[0003] During helicopter cargo hook overhauls, as a final functional test verification, it needs to be able to perform mechanical cable hook release and electronically controlled hook release functions while bearing 6.7 tons (the device is designed to withstand 10 tons). The release tension and current values ​​are measured to verify that the cargo hook meets the manual requirements. Therefore, this application provides a cargo hook tension testing device to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a cargo hook tension testing device that can quickly test the magnitude of the tension required to pull the cargo hook body apart and has a breakage protection mechanism. This effectively suppresses inertial rebound, prevents damage to the equipment, and ensures personnel safety.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A cargo hook tensile testing device includes a connector for connecting an auxiliary suspension rod, a connecting frame connected to the connector, two connecting blocks installed on both sides of the lower end of the connecting frame, and a cargo hook body for load testing installed on the lower end of the two connecting blocks. The connector includes an upper column block and a lower column fixed to the lower end of the upper column block. The front end face of the upper column block has a connecting groove, and a fixing pin is inserted into the connecting groove to suspend and connect to the lower end of the suspension rod. Both connecting blocks include H-shaped blocks. The cargo hook body includes a shell and a hook body installed on one side of the lower end inside the shell. A cover is installed on the front end face of the shell by bolts. A mounting plate is fixed on one side of the front end face of the connecting frame by multiple bolts, and the mounting plate is connected to the cargo hook body by a steel cable. The other end of the steel cable is connected to a load tester.

[0007] Furthermore, the load tester is mounted on the pressure testing machine via a fixing plate and multiple bolts.

[0008] Furthermore, the connecting frame includes an isosceles trapezoidal structure with rounded corners and a short upper side. A second connecting port is provided at the upper end of the front face of the connecting frame, and a third connecting port is provided on both sides of the lower end of the front face of the connecting frame. Multiple weight-reducing grooves are provided on both the front and rear faces of the connecting frame.

[0009] Furthermore, the connecting frame is connected by bolts after being aligned with the center of the No. 1 connecting port at the front and rear ends of the lower column through the No. 2 connecting port. The two No. 3 connecting ports are respectively connected to the No. 4 connecting ports at the upper ends of the two H-shaped blocks by bolts.

[0010] Furthermore, both sides of the upper end face of the housing are fixedly provided with lifting lugs and the lifting lugs are provided with No. 5 connection ports. The two No. 5 connection ports are respectively connected to the No. 4 connection ports opened at the lower end of the two H-shaped blocks by bolts.

[0011] Furthermore, an electric discharge connector is fixedly provided on the upper end of the cover, and the electric discharge connector is connected to the control box through an electrical connector.

[0012] This utility model has the following beneficial effects:

[0013] This utility model proposes a cargo hook tension testing device. By designing an adaptable cargo hook mechanism and mounting it on a 10-ton pressure testing machine, it executes a mechanism for mechanically launching a steel cable and electrically controlled launching the cargo hook under a 6.8-ton load. It can effectively measure the steel cable tension and current parameters required for launching the cargo hook. At the same time, in this cargo hook testing component, if any bolt connecting the cargo hook breaks, the cargo hook will not swing around the remaining bolt. The design has a degree of freedom, which enables the inertial rebound to be effectively suppressed by the mechanism, so as not to damage the mechanism and ensure personnel safety. Attached Figure Description

[0014] Figure 1 This is an axonometric structural diagram of the present invention;

[0015] Figure 2 This is a structural diagram of the connecting block of this utility model;

[0016] Figure 3 This is a structural diagram of the connecting frame of this utility model;

[0017] Figure 4 This is a structural diagram of the cargo hook body of this utility model;

[0018] Figure 5 This is a schematic diagram of the connector structure of this utility model;

[0019] Figure 6 Stress diagram for the connector frame design;

[0020] Figure 7Stress diagram for connector design;

[0021] Figure 8 This is a diagram illustrating the design stress of the connecting block.

[0022] Legend:

[0023] 1. Connector; 101. Connecting groove; 102. Connecting port 1; 103. Upper column block; 104. Lower column; 2. Connecting frame; 201. Connecting port 2; 202. Frame body; 203. Weight reduction groove; 204. Connecting port 3; 3. Connecting block; 301. Connecting port 4; 302. H-block; 4. Cargo hook body; 401. Connecting port 5; 402. Shell; 403. Cover; 404. Hook body; 5. Mounting plate; 6. Steel cable; 7. Fixing plate; 8. Load tester. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figure 1-5 This utility model provides an embodiment of a cargo hook tensile testing device, comprising a connector 1 for connecting an auxiliary hanging rod, a connecting frame 2 connected to the connector 1, two connecting blocks 3 installed on both sides of the lower end of the connecting frame 2, and a cargo hook body 4 for load testing installed at the lower end of the two connecting blocks 3. The cargo hook body 4 adopts a commonly used electrically controlled hook body 404 that can be rotatably opened. The structural principle of this device belongs to a known technical solution, and it innovates by combining existing known parts. The cargo hook will not be described in detail here. The connector 1 includes an upper column block 103 and a lower column body 104 fixed at the lower end of the upper column block 103. The upper column block 103 has a connecting groove 101 on its front end face, and the connecting groove 101 is inserted into a fixing pin and hung and connected to the lower end of the hanging rod. The hanging adopts a vertical hanging rod structure and can be used on a 10-ton pressure testing machine. Both connecting blocks 3 include H-shaped blocks 302. The cargo hook body 4 includes a housing 402 and a hook body 404 installed inside the lower end of the housing 402. The front end face of the housing 402 is bolted with a cover 403. The front end face of the connecting frame 2 is fixed with a mounting plate 5 by multiple bolts, and the mounting plate 5 is connected to the cargo hook body 4 by a steel cable 6. The other end of the steel cable 6 is connected to a load tester 8.

[0026] The load tester 8 is mounted on the pressure testing machine via a fixing plate 7 and multiple bolts, enabling the installation and use of the load tester 8. At the same time, the load tester 8 is used to test the tension of the steel cable pulling the cargo hook apart.

[0027] Reference Figures 2-8 The connecting frame 2 includes an isosceles trapezoidal structure with rounded corners and a short upper side. A second connecting port 201 is located at the upper end of the front face of the connecting frame 2, and third connecting ports 204 are located on both sides of the lower end of the front face of the connecting frame 2. Multiple weight-reducing grooves 203 are located on both the front and rear faces of the connecting frame 2. The connecting frame 2 is connected to the lower column 104 via bolts after being aligned with the center of the second connecting port 201 and the first connecting port 102 located at the front and rear ends of the second column 104. The two third connecting ports 204 are respectively connected to the fourth connecting ports 301 located at the upper ends of the two H-blocks 302 via bolts. Lifting lugs are fixedly installed on both sides of the upper face of the shell 402, and fifth connecting ports 401 are located at the lifting lugs. The two fifth connecting ports 401 are respectively connected to the fourth connecting ports 301 located at the lower ends of the two H-blocks 302 via bolts.

[0028] The load shaft connector, i.e., the bolts used for connection, is designed according to the strength specifications of GB / T 3098.1-2010 "Mechanical Properties of Fasteners - Bolts, Screws and Studs". The material is 42CrMo alloy steel (yield strength 970MPa). Finite element analysis was used to design a weight-reducing groove 203 to reduce the weight of the component. The collapse load is 20 tons, and the safety load is 10 tons. Under the condition of an operating load of 6.8 tons, the safety factor is 2.9, and the parameters are met as tested by a load tester. In this example, for safety design, the shaft strength of the connecting bolts used for the hook point is designed with a 10-ton collapse mechanism to prevent damage to the hook from overload. The five connection points—the connection point between the lower end of the connector 1 and the connecting frame 2, the connection point between the connecting frame 2 and the two connecting blocks 3, and the connection point between the two connecting blocks 3 and the hook body 4—are designed with reference to... Figure 1 As can be seen, by using the connecting bolt shafts of the five connection points to restrict its rotation, even if one bolt breaks, the remaining connections will limit its inertial swing out, thus playing a protective role.

[0029] Working principle: In use, the boom fixed on the pressure testing machine is connected to the connector 1, the hook body 4 is connected to the upper connecting block 3, the connecting block 3 is connected to the connecting frame 2, and the connecting frame 2 is connected to the connector 1. This is how the hook body 4 is installed. Then, the remote control box is used to open the hook of the hook body 4. After hanging the connecting ring with the test load on the hook, the hook is closed. Then, the pressure testing machine is started to pull the hook body 4. Under the load of the hook, it bears a static load of 6.8 tons and holds it for 1 minute. The tension of the steel cable 6 connected to the hook pulling the hook is tested by the load tester 8 to test whether the hook body 4 meets the requirements.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cargo hook tensile testing device, comprising a connector (1) for connecting an auxiliary suspension rod, a connecting frame (2) connected to the connector (1), two connecting blocks (3) installed on both sides of the lower end of the connecting frame (2), and a cargo hook body (4) for load testing installed on the lower end of the two connecting blocks (3), characterized in that: The connector (1) includes an upper column block (103) and a lower column body (104) fixed at the lower end of the upper column block (103). The front end face of the upper column block (103) is provided with a connecting groove (101) and the connecting groove (101) is inserted into a fixing pin and hung and connected to the lower end of the hanging rod. Both of the connector blocks (3) include H-shaped blocks (302). The hook body (4) includes a housing (402) and a hook body (404) installed inside the lower end of the housing (402). The front end face of the housing (402) is fitted with a cover (403) by bolts. The front end face of the connector (2) is fixed with a mounting plate (5) by multiple bolts and the mounting plate (5) is connected to the hook body (4) by a steel cable (6). The other end of the steel cable (6) is connected to a load tester (8).

2. The cargo hook tensile force testing device according to claim 1, characterized in that: The load tester (8) is mounted on the pressure tester via a fixing plate (7) and multiple bolts.

3. The cargo hook tensile force testing device according to claim 1, characterized in that: The connecting frame (2) includes a frame (202) with an isosceles trapezoidal structure with rounded corners and the upper end face being the short side. The connecting frame (2) has a second connecting port (201) at the upper end of the front end face and a third connecting port (204) on both sides of the lower end of the front end face. The connecting frame (2) has multiple weight-reducing grooves (203) on both the front end face and the rear end face.

4. The cargo hook tensile force testing device according to claim 3, characterized in that: The connecting frame (2) is aligned with the center of the No. 1 connecting port (102) opened at the front and rear ends of the lower column (104) through the No. 2 connecting port (201) and then connected by bolts. The two No. 3 connecting ports (204) are respectively connected to the No. 4 connecting ports (301) opened at the upper end of the two H-shaped blocks (302) by bolts.

5. The cargo hook tensile force testing device according to claim 1, characterized in that: The upper surface of the housing (402) is fixedly provided with lifting lugs on both sides, and the lifting lugs are provided with No. 5 connection ports (401). The two No. 5 connection ports (401) are respectively connected to the No. 4 connection ports (301) opened at the lower end of the two H-shaped blocks (302) by bolts.

6. The cargo hook tensile force testing device according to claim 1, characterized in that: An electric discharge connector is fixedly installed on the upper end of the cover (403), and the electric discharge connector is connected to the control box through an electrical connector.

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