Ball switch

Abstract

The present invention provides a ball switch, including a steel ball, which is arranged inside an outer needle tube, and a retaining ring is arranged at one end of the outer needle tube to prevent the steel ball from rolling down, and the retaining ring contacts the steel ball; an inner plug is arranged inside the outer needle tube, and one end of the inner plug contacts the steel ball; the other end of the outer needle tube is connected to a hollow insulating outer plug through a left-handed thread, and the thread is sealed with a sealant; an inner needle tube with an airtight pressure-maintaining function with one end closed is installed inside the outer plug, and the closed end of the inner needle tube is exposed outside the outer plug; a large spring is installed between the inner plug and the outer plug; an inner needle rod is slidably installed inside the inner needle tube, and one end of the inner needle rod is always in contact with the inner needle tube, and a small spring is installed at the end of the inner needle rod in contact with the inner needle tube, and the other end of the small spring is installed inside the closed end of the inner needle tube, and the other end of the inner needle rod is adjacent to the inner plug. The overall structure of the ball switch provided by the present invention is very compact, and is suitable for detecting secondary locks and accessories of automotive wiring harness sheaths in narrow spaces.

Description

Technical Field

[0001] The invention relates to the field of automobile wiring harness detection, and in particular to a ball switch for detecting secondary locks and accessories of an automobile wiring harness sheath. Background Art

[0002] The automotive wiring harness is a component that connects automotive electronic and electrical components and enables them to function. It is the main network of the automotive circuit. It is mainly composed of copper connectors (plugs, sockets), plastic sheaths, wire heat shrink tubing, corrugated tubes, etc. The connectors are crimped with the wires and installed in the plastic sheath. The wires are bundled with wire harnesses and wrapped with heat shrink tubing and corrugated tube tape. The role of the wire harness in the vehicle is to transmit and exchange the power signal and data signal of the electrical system to realize the functions and requirements of the electrical system.

[0003] Plastic sheath is one of the essential parts of automobile speed limiter. Plastic sheath can be roughly divided into ordinary type, waterproof type, secondary lock type, airbag type, ECU type, fuse box type.

[0004] Automotive wiring harnesses are everywhere in the car, including engine wiring harnesses and cabin wiring harnesses working in high temperature environments, chassis wiring harnesses working in dusty, watery, and muddy environments, door wiring harnesses that are connected between the door and the body and repeatedly extend and retract for a long time, and power wiring harnesses that carry high-power devices and work at full load or overload for a long time. These wiring harnesses work with vehicles in harsh environments such as the hot and humid southern coastal areas and the cold northeastern regions, and are also subjected to electrical heat loads, corrosion from oil and gasoline, and bumps and vibrations. Therefore, to ensure the quality of automotive wiring harnesses, it is necessary to pay attention to each link from design, material selection, manufacturing process, testing, and assembly.

[0005] With the development of the automobile industry, automobile wiring harness failures have become a focus of attention. Its quality, safety and reliability have a significant impact on automobile quality. If the wiring harness fails, it will cause signal transmission failure and functional equipment to lose its function; or excessive contact resistance will cause heating and fire; or short circuit will cause fire; or insulation layer failure and leakage. Therefore, in order to ensure the quality, safety and reliability of automobile wiring harnesses, it is very important to test the automobile wiring harnesses on the production line or before users use them.

[0006] In the prior art, technicians usually use micro switches to detect the presence or absence of secondary locks and accessories of automobile wiring harness sheaths on automobile wiring harnesses. Micro switches have small contact spacing and quick-action mechanisms, and are contact mechanisms that perform switch movements with a specified stroke and a specified force. They are covered with a shell and have a drive rod on the outside. Because the contact spacing of the switch is relatively small, it is called a micro switch, also known as a sensitive switch. However, when using this micro switch, the plug-in at the bottom needs to be inserted into the middle of the detection sheath. Since the plug-in is a conductive sheet metal part, the plug-in of the micro switch is easily damaged during frequent operation, resulting in inaccurate detection results and affecting the quality of the entire set of automobile wiring harnesses. At the same time, the micro switch is covered with a plastic shell, so the micro switch is slightly larger in size and is not suitable for detecting secondary locks and accessories of automobile wiring harness sheaths in a small space on the side of the automobile wiring harness. When using the micro switch, other auxiliary parts such as shafts, sleeves, springs, etc. are also required, which increases the cost and is not simple to operate. Summary of the invention

[0007] In view of the problems existing in the background technology, the present invention provides a flexible and durable ball switch.

[0008] The technical solution of the present invention is as follows:

[0009] A ball switch, comprising a steel ball, the steel ball being arranged inside an outer needle tube, a retaining ring being arranged at one end of the outer needle tube to prevent the steel ball from rolling down, the retaining ring being in contact with the steel ball; an inner plug being arranged inside the outer needle tube, one end of the inner plug being in contact with the steel ball; a hollow insulating outer plug being connected to the inner side of the other end of the outer needle tube through a left-handed thread, the thread being sealed with thread sealant; an inner needle tube having one end closed and having an airtight pressure-maintaining function being installed in an interference fit inside the outer plug, the closed end of the inner needle tube being exposed outside the outer plug and away from the steel ball;

[0010] A large spring is installed between the inner plug and the outer plug;

[0011] An inner needle rod is slidably installed in the inner needle tube, one end of the inner needle rod is always in contact with the inner needle tube, a small spring is installed at the end of the inner needle rod in contact with the inner needle tube, the other end of the small spring is installed inside the closed end of the inner needle tube, and the other end of the inner needle rod is adjacent to the inner stopper.

[0012] As a preferred embodiment of the present invention, the inner diameter of the retaining ring is not greater than the diameter of the steel ball.

[0013] As a preferred embodiment of the present invention, an external thread is provided on the outer wall of the outer needle tube, and the outer needle tube is installed on the detection module of the detection platform through the external thread.

[0014] As a preferred embodiment of the present invention, the inner plug is T-shaped, the plug head end of the inner plug is provided with an arc surface matching the steel ball, and the plug tail end of the inner plug is arranged inside the large spring.

[0015] As a preferred embodiment of the present invention, the outer shape of the outer plug exposed outside the outer needle tube is set to a square structure, and the outer plug is installed on the detection module of the detection platform through the square structure.

[0016] As a preferred embodiment of the present invention, the inner needle rod end adjacent to the inner plug is arranged into a serrated structure to prevent slipping during surface-to-surface contact.

[0017] As a preferred embodiment of the present invention, the distance between the inner plug and the inner needle rod is 0.30 mm.

[0018] As a preferred embodiment of the present invention, the outer needle tube and the inner needle tube are made of beryllium copper alloy material, and the surfaces of the outer needle tube and the inner needle tube are treated by a gold plating process.

[0019] As a preferred embodiment of the present invention, a wire is welded on the inner needle tube, and a wire is welded on the outer needle tube, and the other ends of the two wires are connected to a controller of a detection system of a detection platform.

[0020] The present invention may also include a connecting sleeve assembly, which includes a plug-in sleeve for plugging and unplugging the closed end of the inner needle tube, an insulating sleeve fixedly connected to the outer surface of the plug-in sleeve, and a connecting sleeve arranged outside the insulating sleeve for plugging and unplugging the outer needle tube. A wire is respectively arranged on the plug-in sleeve and the connecting sleeve, one end of the wire on the plug-in sleeve is connected to the inner needle tube, and one end of the wire on the connecting sleeve is connected to the outer needle tube, and the other ends of the two wires are connected to the controller of the detection system of the detection platform.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The ball switch provided by the present invention inserts the closed end of the inner needle tube into the plug sleeve. Since the inner needle tube is made of beryllium copper alloy material and the surface is gold-plated, the loss rate of the inner needle tube is very small. At the same time, since the inner needle tube is a tubular structure, it is very strong and durable.

[0023] (2) The ball switch provided by the present invention has a very compact overall structure and is suitable for detecting secondary locks and accessories of automobile wiring harness sheaths in narrow spaces. When the space is too narrow, there is no need to install a connecting sleeve assembly, thereby reducing space occupancy.

[0024] (3) In the ball switch provided by the present invention, the plug end of the inner plug is provided with an arc surface matching the steel ball, thereby increasing the contact area between the inner plug and the steel ball and ensuring the stability of the steel ball. At the same time, when the steel ball is subjected to forces in different directions, the sensitivity of the steel ball to pressing the inner plug is increased.

[0025] (4) In the ball switch provided by the present invention, a sawtooth structure is arranged at the inner needle rod end adjacent to the inner plug, and contacts the inner needle rod after the inner plug moves. The sawtooth structure can prevent slipping which is easy to occur when the inner plug contacts the inner needle rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0027] Figure 1 It is the front view of the present invention.

[0028] Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0029] Figure 3 It is an exploded view of the present invention.

[0030] Figure 4 It is a front view of an embodiment of the present invention.

[0031] Figure 5 for Figure 4 Cross-sectional view along direction BB.

[0032] Figure numerals: steel ball 1, outer needle tube 2, retaining ring 3, inner plug 4, outer plug 5, inner needle tube 6, large spring 7, inner needle rod 8, small spring 9, connecting sleeve assembly 10, external thread 21, arc surface 41, square structure 51, plug sleeve 101, insulating sleeve 102, connecting sleeve 103. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution and advantages of the present invention, the present application is described in detail below in conjunction with the accompanying drawings, but it is not intended to limit the protection scope of the present invention.

[0034] See also Figure 1 , Figure 4 A ball switch, comprising a steel ball 1, wherein the steel ball 1 is arranged inside an outer needle tube 2, wherein one end of the outer needle tube 2 is provided with a retaining ring 3 for preventing the steel ball 1 from rolling down, wherein the retaining ring 3 is in contact with the steel ball 1, and wherein the inner diameter of the retaining ring 3 is not greater than the diameter of the steel ball 1;

[0035] An external thread 21 is provided on the outer wall of the outer needle tube 2 , and the outer needle tube 2 is installed on the detection module (model 100*50 or 100*100) of the detection platform through the external thread 21 .

[0036] The outer needle tube 2 and the inner needle tube 6 are made of beryllium copper alloy material, and the surfaces of the outer needle tube 2 and the inner needle tube 6 are processed by a gold plating process.

[0037] See also Figure 2 , Figure 5 : An inner plug 4 is also provided inside the outer needle tube 2, one end of which is in contact with the steel ball 1; the other end of the outer needle tube 2 is connected to a hollow insulating outer plug 5 through a left-handed thread, and the thread is sealed with thread sealant; an inner needle tube 6 with an airtight pressure-maintaining function and one end of which is closed is interference-fitted inside the outer plug 5, and the closed end of the inner needle tube 6 is exposed outside the outer plug 5 and away from the steel ball 1;

[0038] A large spring 7 is installed between the inner plug 4 and the outer plug 5;

[0039] An inner needle rod 8 is slidably installed in the inner needle tube 6, one end of the inner needle rod 8 is always in contact with the inner needle tube 6, a small spring 9 is installed at the end of the inner needle rod 8 in contact with the inner needle tube 6, the other end of the small spring 9 is installed inside the closed end of the inner needle tube 6, and the other end of the inner needle rod 8 is adjacent to the inner stopper 4;

[0040] The inner plug 4 is T-shaped, and the plug head end of the inner plug 4 is provided with an arc surface 41 matching the steel ball 1 , and the plug tail end of the inner plug 4 is arranged inside the large spring 7 .

[0041] The outer plug 5 exposed outside the outer needle tube 2 is configured to have an external shape of a square structure 51 , and the outer plug 5 is mounted on a detection module (model 100*50 or 100*100) of a detection station through the square structure 51 .

[0042] The end of the inner needle rod 8 adjacent to the inner plug 4 is configured as a sawtooth structure to prevent slipping when the surfaces are in contact with each other;

[0043] The distance between the inner plug 4 and the inner needle rod 8 is 0.30 mm.

[0044] A wire is welded on the inner needle tube 6, and a wire is welded on the outer needle tube 2. The other ends of the two wires are connected to the controller (model 400b) of the detection system of the detection platform.

[0045] See also Figure 2 , Figure 3 :The present invention also includes a connecting sleeve assembly 10, which includes a plug-in sleeve 101 for plugging and unplugging the closed end of the inner needle tube 6, an insulating sleeve 102 fixedly connected to the outer surface of the plug-in sleeve 101, and a connecting sleeve 103 arranged outside the insulating sleeve 102 for plugging and unplugging the outer needle tube 2. A wire is respectively arranged on the plug-in sleeve 101 and the connecting sleeve 103, one end of the wire on the plug-in sleeve 101 is connected to the inner needle tube 6, and one end of the wire on the connecting sleeve 103 is connected to the outer needle tube 2. The other ends of the two wires are connected to the controller (model 400b) of the detection system of the detection platform.

[0046] The following will refer to the attached Figure 1-5 The working principle of the present invention is described.

[0047] First, when the operating space is too narrow, it is not necessary to install the connecting sleeve assembly. Insert the square structure 51 of the outer plug 5 into the wrench structure of the detection module of the automobile wiring harness sheath secondary lock and accessories detection platform, and use the external thread 21 on the outer wall of the outer needle tube 2 to fix the outer needle tube 2 on the detection module of the automobile wiring harness sheath secondary lock and accessories detection platform. At this time, a wire is welded on the inner needle tube 6 and the outer needle tube 2, and the other ends of the two wires are connected to the controller of the detection system of the automobile wiring harness sheath secondary lock and accessories detection platform;

[0048] When the operating space is sufficient to install the connecting sleeve assembly 10, the square structure 51 of the outer plug 5 is inserted into the wrench structure of the detection module of the automobile wiring harness sheath secondary lock and accessories testing platform, and the outer needle tube 2 is fixed to the detection module of the automobile wiring harness sheath secondary lock and accessories testing platform using the external thread 21 on the outer wall of the outer needle tube 2, and then the plug sleeve 101 and the insulating sleeve 102 are installed on the closed end of the inner needle tube 6, and finally the connecting sleeve 103 is installed on the outer needle tube 2. Two wires are arranged on the connecting sleeve 103, one of which is connected to the inner needle tube 6, and the other is connected to the outer needle tube 2, and the other ends of the two wires are connected to the controller of the detection system of the automobile wiring harness sheath secondary lock and accessories testing platform.

[0049] Then, the secondary lock and accessories of the automobile wiring harness sheath are tested. When the secondary lock and accessories of the automobile wiring harness sheath touch the steel ball 1, the steel ball 1 presses the inner plug 4, and the inner plug 4 presses the large spring 7. At the same time, when the inner plug 4 moves a distance of not less than 0.3 mm, the inner plug 4 contacts the inner needle rod 8, and the inner needle rod 8 slides along the inner needle tube 6 to press the small spring 9. Since the outer plug 5 is insulating, only when the inner plug 4 and the inner needle rod 8 contact each other can the detection signal of the secondary lock and accessories of the automobile wiring harness sheath be transmitted to the inner needle tube 6. At the same time, the inner needle tube 6 transmits the detection signal to the detection system through the wire. When the secondary lock and accessories of the automobile wiring harness sheath fail, the detection system will not receive the detection signal, so as to judge whether the secondary lock and accessories of the automobile wiring harness sheath exist.

[0050] Finally, when the inspection is completed, remove the secondary lock and accessories of the automobile wiring harness sheath, the inner needle tube 6 returns to its original position under the elastic restoring force of the small spring 9, and the inner plug 4 returns to its original position under the elastic restoring force of the large spring 7. At the same time, the steel ball 1 returns to its original position under the push of the inner plug 4.

[0051] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A ball switch, characterized in that: It comprises a steel ball, which is arranged inside an outer needle tube, and a retaining ring is arranged at one end of the outer needle tube to prevent the steel ball from rolling down, and the retaining ring is in contact with the steel ball; an inner plug is also arranged inside the outer needle tube, and one end of the inner plug is in contact with the steel ball; the other end of the outer needle tube is connected to a hollow insulating outer plug through a left-handed thread, and the thread is sealed with thread sealant; an inner needle tube with one end closed and airtight pressure-maintaining function is interference-fitted inside the outer plug, and the closed end of the inner needle tube is exposed outside the outer plug and away from the steel ball; A large spring is installed between the inner plug and the outer plug; An inner needle rod is slidably installed in the inner needle tube, one end of the inner needle rod is always in contact with the inner needle tube, the end of the inner needle rod in contact with the inner needle tube is connected to one end of a small spring, the other end of the small spring is installed inside the closed end of the inner needle tube, and the other end of the inner needle rod is adjacent to the inner stopper; The inner diameter of the retaining ring is not greater than the diameter of the steel ball; The inner plug is T-shaped, one end of the inner plug is provided with an arc surface matching the steel ball, and the other end of the inner plug is arranged inside the large spring.

2. The ball switch according to claim 1, characterized in that: An external thread is provided on the outer wall of the outer needle tube, and the outer needle tube is installed on the detection module of the detection platform through the external thread.

3. The ball switch according to claim 1, characterized in that: The outer shape of the outer plug exposed outside the outer needle tube is set to a square structure, and the outer plug is installed on the detection module of the detection platform through the square structure.

4. The ball switch according to claim 1, characterized in that: The other end of the inner needle rod is configured as a sawtooth structure to prevent slipping during surface-to-surface contact.

5. The ball switch according to claim 1, characterized in that: The distance between the inner plug and the inner needle rod is 0.30 mm.

6. The ball switch according to claim 1, characterized in that: The outer needle tube and the inner needle tube are made of beryllium copper alloy material, and the surfaces of the outer needle tube and the inner needle tube are processed by a gold plating process.

7. The ball switch according to claim 1, characterized in that: The inner needle tube is welded to one end of a wire, the outer needle tube is welded to one end of another wire, and the other ends of the two wires are connected to a controller of a detection system of a detection platform.

8. The ball switch according to any one of claims 1 to 6, characterized in that: It also includes a connecting sleeve assembly, which includes a plug-in sleeve for plugging and unplugging the closed end of the inner needle tube, an insulating sleeve fixedly connected to the outer surface of the plug-in sleeve, and a connecting sleeve arranged outside the insulating sleeve for plugging and unplugging the outer needle tube. The plug-in sleeve and the connecting sleeve are each provided with a wire, one end of the wire on the plug-in sleeve is connected to the inner needle tube, and one end of the wire on the connecting sleeve is connected to the outer needle tube, and the other ends of the two wires are connected to the controller of the detection system of the detection platform.

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