Quick-release device and performance verification method for steel ball hole closing-up of quick-release device

Abstract

The invention belongs to a mechanical structure, and relates to a quick release device and a performance verification method of a steel ball hole closing-up of the quick release device. The quick release device comprises a steel ball, a pin core sleeve, a pin core rod, a pin body outer sleeve, a spring and a ring; the pin core sleeve is of a step cylinder structure. After the outer circle of the large end of the pin core sleeve is screwed with the pin body outer sleeve, the pin body outer sleeve is rolled and closed up; the pin core rod is located in an inner cavity formed by the pin core sleeve and the pin body sleeve, an end button of the pin core rod extends out of a port of the pin body sleeve, and a spring is arranged between the lower end face of the end button and a step of an inner hole of the pin core sleeve. Two through holes with closed outer ends are formed in the small end, close to the end, of the pin core sleeve in the diameter direction, and steel balls are placed in the through holes and supported by the closed outer ends and the pin core rod; an annular groove is formed in the small-diameter end of the pin core rod and used for enabling the steel ball to fall into the annular groove when a button at the end of the pin core rod is pressed, and the quick release device can be inserted and pulled out.

Description

Technical Field

[0001] The present invention belongs to mechanical structures and relates to a quick-release device and a method for verifying the performance of the steel ball hole necking of the quick-release device. Background Art

[0002] The quick-release device is a general component for helicopters and is widely used in helicopter models. The quick-release device ( Figure 1 ) consists of a pin core sleeve, steel balls, a pin outer sleeve, a ring, a ring, a hexagonal sleeve, a washer, a spring, a spring outer sleeve, an open washer, a pin core rod, etc. The steel balls are always inside the holes of the pin core sleeve. By pressing the hexagonal sleeve or pulling the ring, the plugging function of the quick-release device can be realized.

[0003] During the use of this product, problems such as steel ball shedding, quick-release device jamming and rusting, and pin core sleeve rotation occur, which do not meet the usage requirements of helicopter models. Therefore, it is necessary to improve and develop this product. Summary of the Invention

[0004] Object of the Invention: Due to the unqualified necking process of the pin core sleeve in the original quick-release device, the problem of pin core sleeve rotation occurs. In the improved quick-release device, the pin core sleeve and the pin outer sleeve are changed from direct necking to a threaded connection method, and at the same time, necking is added between the pin core sleeve and the pin outer sleeve to avoid pin core sleeve rotation.

[0005] Technical Solution:

[0006] In the first aspect, a quick-release device is provided, including: steel balls, a pin core sleeve, a pin core rod, a pin outer sleeve, a spring, a ring;

[0007] The pin core sleeve is a stepped cylindrical structure; the outer circle of the large end of the pin core sleeve is screwed to the pin outer sleeve. After the two are screwed together, the pin outer sleeve is roll-pressed and necked. The pin core rod is located inside the cavity formed by the pin core sleeve and the pin outer sleeve. The end button of the pin core rod extends out from the port of the pin outer sleeve. A spring is arranged between the lower end surface of the end button and the step of the inner hole of the pin core sleeve. Two through holes with outer-end necking are opened along the diameter direction near the end of the small end of the pin core sleeve. Steel balls are placed in the through holes and are supported by the outer-end necking and the pin core rod. An annular groove is opened at the small-diameter end of the pin core rod. When the end button of the pin core rod is pressed, the steel balls fall into the annular groove, and the quick-release device can perform plugging and unplugging operations.

[0008] In the second aspect, a method for verifying the performance of the steel ball hole necking of a quick-release device is provided, including:

[0009] Use a tool to fix the quick release device, and slowly apply axial pressing force to the button of the quick release device until the end button is flush with the pin body sleeve. The button pressing force should meet the requirements of the basic mechanical properties of the quick release device. The tool to fix the quick release device includes: a base, an interlayer, a fixing cover, and a push rod. The interlayer with a quick release device mounting hole in the middle is placed on the upper end surface of the base, the quick release device is inverted and inserted into the quick release device mounting hole of the interlayer, the steel ball is exposed from the interlayer, the fixing cover fixes and locks the base and the interlayer, the pin core sleeve exposed from the interlayer from the top is inserted into the push rod channel of the fixing cover, the push rod is inserted into the push rod channel from the top to support the pin core sleeve, and the axial pressing force is applied.

[0010] Furthermore, the basic mechanical performance requirements of the quick release device are shown in Table 1:

[0011] Table 1

[0012]

[0013] Furthermore, the method further comprises:

[0014] Conduct a radial push-out force test on a steel ball. This test requires the removal of the pin core rod and a steel ball of the quick release device:

[0015] Place the pin core sleeve on the V-shaped fixture with the steel ball facing downward. The steel ball is not allowed to contact the V-shaped fixture. Apply the radial push-out force of the steel ball according to the load in Table 1. After completing the radial push-out force test of one steel ball, put the steel ball into the other steel ball hole to continue the test.

[0016] If the steel ball falls out of the pin core sleeve during the above test, it means that the quick release device is unqualified.

[0017] Furthermore, the method further comprises:

[0018] Carry out plug-in life test, which is divided into two stages: installation and removal;

[0019] The plug-in and pull-out life test is carried out for 10,000 times at a frequency of 10±5 times / min. The axial push-out force of the steel ball of the quick-release device shall meet the requirements of Table 1. The plug-in and pull-out life test fixture includes a single-ear sandwich panel and a double-ear sandwich panel. The single-ear structure of the single-ear sandwich panel is inserted into the double-ear structure of the double-ear sandwich panel to form a sandwich member with coaxial mounting holes, and the quick-release device is inserted into the coaxial mounting hole.

[0020] Furthermore, the method further comprises:

[0021] After the plug-in life test is completed, the steel ball axial push-out force test is carried out again.

[0022] Further, the installation phase:

[0023] First prepare the parts and process the mounting holes of the sandwich parts → press and hold the button → install the sandwich panel → release the button → assembly is completed.

[0024] Further, during the disassembly phase: Hold the button with one hand → Pull out the part → Disassembly completed.

[0025] Beneficial effects:

[0026] The present invention has established the test processes and methods for the button pressing force, radial pushing force of the steel ball, axial pushing force of the steel ball, and product life test of the quick-release device, filling the technical gap of the quick-release device products and ensuring the closing quality of the steel ball holes and the overall quality of the products. By adding new test requirements for the quick-release device, the present invention has significantly improved the closing quality of the steel ball holes of the quick-release device and solved the problem of steel ball detachment of the quick-release device. Description of the Drawings

[0027] Figure 1 It is the assembly drawing of the original quick-release device.

[0028] Figure 2 It is the assembly drawing of the improved quick-release device.

[0029] Figure 3 It is the structural schematic diagram of the button pressing force test tooling.

[0030] Figure 4 It is the schematic diagram of the radial pushing force test of the steel ball.

[0031] Figure 5 It is the schematic diagram of the axial pushing test.

[0032] Figure 6 It is the schematic diagram of the plugging and unplugging life test. Detailed Embodiments

[0033] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings in the embodiments of this application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below by referring to the drawings are exemplary and are intended to explain this application and should not be construed as limiting this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the drawings.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "axial direction", "vertical", "upper", "lower", "upper end", "bottom end", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0035] The original quick-release device had too many parts, which affected the reliability of the product. In the improved quick-release device, the pin body gland and the pin body outer sleeve are combined into one part, the hexagonal sleeve and the pin core rod are combined into one part, the snap ring and the washer are cancelled, and a ring is added to ensure the connection between the quick-release device and the structure. To improve the user experience, its opening and closing method is changed from the double-action method of pressing-pulling to the single-action method of pressing. The steel ball grooves of the pin core rod are changed from two places to one place. The improved quick-release device is as Figure 2 shown.

[0036] The stability of the closing quality of the steel ball holes of the quick-release device is very important. After the steel ball holes of the pin core sleeve are closed, various test methods need to be used to ensure the reliability of the steel ball closing. The specific requirements and methods are as follows:

[0037] 4.1 Button pressing force

[0038] Use the Figure 3 shown tooling to fix the quick-release device, and slowly apply an axial pressing force to the button of the quick-release device until the button is flush with the pin body outer sleeve. The button pressing force should meet the requirements of Table 1.

[0039] Table 1 Basic mechanical properties of the quick-release device

[0040]

[0041] 4.2 Radial pushing force of the steel ball

[0042] This test is carried out after the closing of the steel ball holes of the pin core sleeve is completed, by removing the core rod and one steel ball.

[0043] Place the pin core sleeve sample on the V-shaped tooling ( Figure 4 ), with the steel ball facing downwards. The steel ball is not allowed to contact the V-shaped tooling. Apply the radial pushing force of the steel ball according to the load in Table 1, and the steel ball should not pop out of the steel ball hole of the pin core sleeve. After completing the radial pushing force test of one steel ball, put the steel ball into another steel ball hole and continue the test.

[0044] 4.3 Axial pushing force of the steel ball

[0045] The test tooling is as Figure 5As shown in the figure, the installation aperture of the quick-release device is shown in Table 1, and the chamfer at the hole edge is 0.5 mm × 45°. Install the specimen on the universal testing machine and axially load the specimen in the reverse direction with the ejector punch at a speed of 1.2 mm / min until the quick-release device is pushed out from the installation sandwich. The minimum push-out load of the quick-release device shall meet the requirements of Table 1.

[0046] 4.4 Insertion and extraction life test

[0047] The tooling for the insertion and extraction life test is as Figure 6 shown in the figure. The structure opening is shown in Table 1. The insertion and extraction life test of the quick-release device is divided into two stages: installation and disassembly. During installation, first prepare the parts and machine the installation holes of the sandwich parts → press the button → insert the sandwich plate → release the button → assembly completed; during disassembly, press the button with one hand → pull out the parts → disassembly completed. Conduct 10,000 times of insertion and extraction life test at a frequency of 10 ± 5 times / min. After the test is completed, conduct the axial push-out force test of the steel ball. The axial push-out force of the steel ball of the quick-release device shall meet the requirements of Table 1.

[0048] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the technical field of the present application within the technical scope disclosed by the present application shall be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

[0049] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A quick-release device, characterized in that, include: Steel ball, pin core sleeve, pin core rod, pin body sleeve, spring, ring; The pin core sleeve is a stepped cylindrical structure; The outer circle of the large end of the pin core sleeve is screwed to the outer sleeve of the pin body. After the two are screwed together, the outer sleeve of the pin body is rolled and closed; The pin core rod is located in the inner cavity formed by the pin core sleeve and the pin body sleeve, the end button of the pin core rod extends out from the port of the pin body sleeve, and a spring is arranged between the lower end surface of the end button and the step of the inner hole of the pin core sleeve; two through holes with closed outer ends are opened along the diameter direction near the end of the small end of the pin core sleeve, and steel balls are placed in the through holes, and the steel balls are supported by the closed outer ends and the pin core rod; an annular groove is opened at the small diameter end of the pin core rod, and the groove is used for the steel ball to fall into the annular groove when the end button of the pin core rod is pressed, and the quick release device can perform plugging and unplugging operations.

2. A performance verification method for closing the steel ball hole of a quick release device, characterized in that: include: Use a tool to fix the quick release device, and slowly apply axial pressing force to the button of the quick release device described in claim 1 until the end button is flush with the pin body sleeve. The button pressing force should meet the basic mechanical performance requirements of the quick release device; The tool fixing quick-release device comprises: a base (1), an interlayer (3), a fixing cover (4), and a push rod (5); The interlayer (3) with a quick-release device mounting hole in the middle is placed on the upper end surface of the base (1), the quick-release device is inverted and inserted into the quick-release device mounting hole of the interlayer, the steel ball is exposed from the interlayer (3), the fixing cover (4) fixes and locks the base (1) and the interlayer (3), the pin core sleeve exposed from the interlayer (3) from the top is inserted into the push rod channel of the fixing cover (4), and the push rod (5) is inserted from the top into the push rod channel to support the pin core sleeve and apply axial pressing force.

3. The method according to claim 2, characterized in that, The basic mechanical performance requirements of the quick release device are shown in Table 1: Table 1 4. The method according to claim 3, wherein The method further comprises: Conduct a radial push-out force test on a steel ball. This test requires the removal of the quick-release device's pin core rod and a steel ball: Place the pin core sleeve on the V-shaped fixture with the steel ball facing downward. The steel ball is not allowed to contact the V-shaped fixture. Apply the radial push-out force of the steel ball according to the load in Table 1. After completing the radial push-out force test of one steel ball, put the steel ball into the other steel ball hole to continue the test. If the steel ball falls out of the pin core sleeve during the above test, it means that the quick release device is unqualified.

5. The method according to claim 3, wherein The method further comprises: Carry out plug-in life test, which is divided into two stages: installation and removal; The plug-in and pull-out life test is carried out 10,000 times at a frequency of 10±5 times / min. The axial push-out force of the steel ball of the quick-release device shall meet the requirements of Table 1. The plug-in and pull-out life test fixture comprises a single-ear sandwich plate (1') and a double-ear sandwich plate (3'); the single-ear structure of the single-ear sandwich plate (1') is inserted into the double-ear structure of the double-ear sandwich plate (3') to form a sandwich member with coaxial mounting holes, and the quick-release device is inserted into the coaxial mounting hole.

6. The method according to claim 5, wherein The method further comprises: After the plug-in life test is completed, the steel ball axial push-out force test is carried out again.

7. The method according to claim 5, wherein Installation phase: First prepare the parts and process the mounting holes of the sandwich parts → press and hold the button → install the sandwich panel → release the button → assembly is completed.

8. The method according to claim 5, characterized in that, Disassembly stage: press the button with one hand → pull out the parts → disassembly is completed.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, the method according to any one of claims 2 to 8 is implemented.

Images