Fixtures

Abstract

A fixing device is suitable for assembling a circuit board on a substrate of an electronic device. The circuit board has a coupling hole. The fixing device includes a bearing coupled to the substrate, a sleeve surrounding the bearing, and a housing coupled to the sleeve. The bearing includes a rod. The rod has a protrusion. The housing includes two shells and two elastic clamps. The elastic clamp surrounds the protrusion of the bearing and can be pushed by the protrusion to fix the coupling hole. The coupling hole of the circuit board can be fixed by the elastic clamp and the sleeve can be moved to link the elastic clamp to be pushed by the protrusion, and the elastic clamp is fixed to the design of the circuit board, and the bearing is coupled to the substrate. When the elastic clamp of the housing is pushed and expanded by the protrusion of the bearing to block the circuit board, the circuit board is assembled to the substrate, and the assembly is convenient and effective to achieve tool-free assembly.

Description

Technical Field

[0001] The present invention relates to a mounting assembly, and more particularly to a tool-free assembly fixing device. Background Art

[0002] In server systems, circuit boards often need to be secured to the chassis base or motherboard. This is typically done using screws or other fastening components. Assembly requires not only screws but also the use of a cumbersome fastening tool. This is a time-consuming and labor-intensive process, creating significant user frustration and necessitating further research and improvement. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fixing device which is easy to install and can be assembled without tools.

[0004] To address the aforementioned technical problems, the present invention provides a fixing device suitable for assembling a circuit board onto a substrate of an electronic device. The circuit board has a mounting hole. The fixing device is disposed on the substrate and extends from the substrate toward the circuit board. The fixing device comprises a bearing coupled to the substrate, a spring unit coupled to the bearing, a sleeve surrounding the bearing and coupled to the spring unit, and a housing coupled to the sleeve.

[0005] The bearing comprises a base portion coupled to the substrate and a rod portion extending from the base portion toward the circuit board. The rod portion comprises a rod body and a protruding piece extending from the rod body toward the coupling hole of the circuit board.

[0006] The spring unit comprises a compression spring longitudinally surrounding the rod on which the bearing is mounted, and a steel ball spring transversely extending through the rod of the bearing. The steel ball spring comprises an elastic body extending through the rod, and two steel balls disposed at opposite ends of the elastic body, extending through the rod, and located on opposite sides of the rod.

[0007] The sleeve includes a cylindrical body coupled to the steel ball spring of the spring unit, a chute track annularly arranged on the inner side of the cylindrical body and allowing the steel balls of the steel ball spring to slide, two first limiting holes arranged in the chute track and allowing the steel balls of the steel ball spring to removably enter, and two second limiting holes arranged in the chute track and allowing the steel balls of the steel ball spring to removably enter. The cylindrical body covers the bearing and can press the compression spring. The chute track has two first fixing portions located on opposite sides of the cylindrical body, and two second fixing portions located on opposite sides of the cylindrical body. The first fixing portion is located above the second fixing portion, and each first fixing portion is located between the second fixing portions. The first limiting holes are respectively arranged in the first fixing portion of the chute track, and the second limiting holes are respectively arranged in the second fixing portion of the chute track. The cylindrical body has a top portion penetrated by the protruding piece of the rod portion of the bearing.

[0008] The housing includes two shells coupled to the outer side of the cylindrical body of the sleeve, and two elastic clamps extending from the shells toward the circuit board and capable of being removably clamped to the coupling hole of the circuit board. The elastic clamps surround the protrusion of the bearing and can be pushed by the protrusion to clamp the coupling hole. The sleeve can move between a coupling position and a non-coupling position relative to the steel ball of the steel ball spring. In the coupling position, the first limiting hole of the sleeve is clamped by the steel ball of the steel ball spring and the elastic clamp of the housing is pushed by the protrusion of the bearing and is clamped to the coupling hole of the circuit board; in the non-coupling position, the second limiting hole of the sleeve is clamped by the steel ball of the steel ball spring and the elastic clamp of the housing is not pushed by the protrusion of the bearing. When the circuit board is moved toward the substrate and the coupling hole of the circuit board is passed through the elastic clip of the shell, and the circuit board pushes the shell of the shell toward the substrate, the shell drives the barrel of the sleeve to press the compression spring of the spring unit toward the substrate and simultaneously moves the steel ball of the steel ball spring away from the second limiting hole and moves along the slide track and toward the first limiting hole, and the elastic clip of the shell is pushed by the protrusion of the bearing to expand the elastic clips away from each other, and when it moves to the coupling position, the steel ball of the steel ball spring is stuck in the first limiting hole and the elastic clip is pushed and expanded by the protrusion of the bearing to block the circuit board. At this time, the elastic clip is fixedly coupled to the circuit board.

[0009] Compared with the prior art, the present invention uses the elastic fastener of the shell to fasten the coupling hole of the circuit board, and the sleeve can be moved and linked so that the elastic fastener of the shell is pushed by the protrusion of the bearing, and the elastic fastener is fastened to the coupling hole of the circuit board, and the base of the bearing is ingeniously coupled to the substrate. When the sleeve is moved to the coupling position, the steel ball of the steel ball spring is inserted into the first limiting hole of the sleeve and the elastic fastener of the shell is pushed and expanded by the protrusion of the bearing to block the circuit board. At this time, the elastic fastener is fastened to the circuit board, so that the circuit board is assembled to the substrate, which is convenient to assemble and effectively achieves tool-free assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0011] Figure 1 is an exploded perspective view illustrating an embodiment of the fixing device of the present invention;

[0012] Figure 2 is a perspective exploded view illustrating an embodiment of the fixing device of the present invention applied to a circuit board assembly and a substrate;

[0013] Figure 3 This is a sectional view, auxiliary explanation Figure 2 ;

[0014] Figure 4 is a three-dimensional diagram illustrating that two elastic clips of a housing pass through a coupling hole of the circuit board in this embodiment;

[0015] Figure 5 is a three-dimensional diagram illustrating that, in this embodiment, the elastic clamping member of the housing is pushed by a protruding member of a bearing, thereby securing the elastic clamping member to the circuit board; and

[0016] Figure 6 It is a three-dimensional diagram illustrating the structure of a slide track of a sleeve in this embodiment. DETAILED DESCRIPTION

[0017] Before the present invention is described in detail, it should be noted that similar components are denoted by the same reference numerals in the following description.

[0018] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6An embodiment of the fixing device of the present invention is suitable for assembling a circuit board 80 onto a substrate 70 of an electronic device (not shown). The circuit board 80 has a coupling hole 81. The fixing device is disposed on the substrate 70 and extends from the substrate 70 toward the circuit board 80. The fixing device comprises a bearing 1 coupled to the substrate 70, a spring unit 2 coupled to the bearing 1, a sleeve 3 surrounding the bearing 1 and coupled to the spring unit 2, and a housing 4 coupled to the sleeve 3.

[0019] The bearing 1 includes a base 11 coupled to the substrate 70 and a rod 12 extending from the base 11 toward the circuit board 80. The rod 12 has a body 121 and a protrusion 122 extending from the body 121 toward the coupling hole 81 of the circuit board 80. In this embodiment, the base 11 is fixedly coupled to the substrate 70 and includes a base 111 coupled to the substrate 70 and a locking member 112 extending from the base 111 toward the substrate 70, penetrating the substrate 70, and locked therewith.

[0020] The spring unit 2 includes a compression spring 21 that longitudinally surrounds the rod 121 of the bearing 1, and a steel ball spring 22 that transversely penetrates the rod 121 of the bearing 1. The steel ball spring 22 has an elastic body 221 that penetrates the rod 121, and two steel balls 222 disposed at opposite ends of the elastic body 221, extending through the rod 121, and located on opposite sides of the rod 121.

[0021] The sleeve 3 includes a cylinder 31 (for the convenience of description, Figure 1 and Figure 6The sleeve 3 is divided into two halves ( FIG. 2 ), a chute track 32 provided on the inner side of the cylinder 31 for sliding movement of the steel ball 222 of the steel ball spring 22, two first limiting holes 33 provided within the chute track 32 for removably entering the steel ball 222 of the steel ball spring 22, and two second limiting holes 34 provided within the chute track 32 for removably entering the steel ball 222 of the steel ball spring 22. The cylinder 31 covers the bearing 1 and can press against the compression spring 21. The chute track 32 has two first fixing portions 321 located on opposite sides of the cylinder 31, and two second fixing portions 324 located on opposite sides of the cylinder 31. The first fixing portion 321 is located above the second fixing portion 324, and each first fixing portion 321 is located between the second fixing portions 324. The first limiting holes 33 are respectively provided in the first fixing portion 321 of the chute track 32, and the second limiting holes 34 are respectively provided in the second fixing portion 324 of the chute track 32. The cylinder 31 has a top portion 311 penetrated by the protruding piece 122 of the rod portion 12 of the bearing 1.

[0022] The housing 4 includes two shells 41 coupled to the outer side of the cylindrical body 31 of the sleeve 3, and two elastic clamps 42 extending from the shells 41 toward the circuit board 80 and removably clamping the coupling holes 81 of the circuit board 80. The elastic clamps 42 surround the protrusions 122 of the bearing 1 and can be pushed by the protrusions 122 to clamp the coupling holes 81. The elastic clamps 42 of the housing 4 gradually extend from the shell 41 toward the circuit board 80 and surround the protrusions 122 of the bearing 1, so when the protrusions 122 of the bearing 1 extend into and push against the elastic clamps 42, the gradually extending portion of the elastic clamps 42 will be pushed outward by the protrusions 122. In this embodiment, the shells 41 of the housing 4 are glued to the outer side of the cylindrical body 31 of the sleeve 3, but this is not limited to this.

[0023] The sleeve 3 is movable relative to the steel ball 222 of the steel ball spring 22 between an engaged position and a disengaged position. In the engaged position, the first limiting hole 33 of the sleeve 3 is engaged by the steel ball 222 of the steel ball spring 22, causing the elastic clamping member 42 of the housing 4 to be pushed against the protruding member 122 of the bearing 1, thereby securing the elastic clamping member 42 to the engaging hole 81 of the circuit board 80. In the disengaged position, the second limiting hole 34 of the sleeve 3 is engaged by the steel ball 222 of the steel ball spring 22, and the elastic clamping member 42 of the housing 4 is not pushed against the protruding member 122 of the bearing 1. In the non-combined position, when the circuit board 80 is moved toward the substrate 70 and the coupling hole 81 of the circuit board 80 is passed through by the elastic clamping member 42 of the housing 4, and the circuit board 80 is pushed against the shell 41 of the housing 4 in the direction of the substrate 70, the shell 41 drives the barrel 31 of the sleeve 3 to press the compression spring 21 of the spring unit 2 in the direction of the substrate 70 and simultaneously moves the steel ball 222 of the steel ball spring 22 away from the second limiting hole 34, and then continues to rotate the barrel 31 of the sleeve 3 in the direction of the substrate 70. The steel ball 222 located in the slide track 32 of the sleeve 3 moves toward the first limiting hole 33, and the elastic clamping piece 42 of the housing 4 is pushed by the protruding piece 122 of the bearing 1, so that the elastic clamping piece 42 expands in the direction away from each other, and when it moves to the combined position, the steel ball 222 of the steel ball spring 22 is stuck in the first limiting hole 33 and the elastic clamping piece 42 is pushed and expanded by the protruding piece 122 of the bearing 1 to block the circuit board 80. At this time, the elastic clamping piece 42 is fixedly combined with the circuit board 80. Specifically, in the non-combined position, when an external force is applied to push the shell 41 of the housing 4 toward the substrate 70, the shell 41 drives the barrel 31 of the sleeve 3 to rotate toward the substrate 70 to press the compression spring 21 of the spring unit 2, and during the rotation of the barrel 31, the chute track 32 located in the barrel 31 is synchronously moved relative to the steel ball 222 and the steel ball 222 is moved out of the second limiting hole 34 located in the second fixing portion 324 of the chute track 32, and the steel ball 222 is continued to be moved toward the chute. The track 32 moves in the direction of the first limiting hole 33 in the first fixing portion 321. When the steel ball 222 is inserted into the first limiting hole 33 and the elastic clamping piece 42 of the housing 4 is pushed by the protrusion 122 of the bearing 1, the elastic clamping piece 42 will be pushed outward by the protrusion 122. At this time, the sleeve 3 is located in the combined position and the cylinder 31 of the sleeve 3 presses the compression spring 21, and the compression spring 21 accumulates an elastic restoring force, and the shell 41 of the housing 4 is separated from the base 111 of the bearing 1 by a pre-compression gap d.Relatively speaking, in the combined position, since the housing 41 and the base 111 of the bearing 1 are separated by the preload gap d, the housing 41 of the outer shell 4 can continue to be pushed toward the substrate 70. When an external force is applied to push the housing 41 toward the substrate 70, the housing 41 drives the barrel 31 of the sleeve 3 to move toward the substrate 70 and further presses the compression spring 21 of the spring unit 2. After the steel ball 222 is moved out of the first limiting hole 33 in the first fixing portion 321 of the chute track 32, no external force is applied to push the housing 41 toward the substrate 70. At this time, The elastic restoring force of the compression spring 21 will push the cylinder 31 away from the substrate 70 and cause the cylinder 31 of the sleeve 3 to rotate away from the substrate 70. During the rotation of the cylinder 31, the slide track 32 located in the cylinder 31 will be synchronously moved relative to the steel ball 222 and the steel ball 222 will be moved toward the second limiting hole 34 located in the second fixing part 324 of the slide track 32. When the steel ball 222 is stuck in the second limiting hole 34 and the elastic clamping piece 42 of the housing 4 is not pushed by the protrusion 122 of the bearing 1, the sleeve 3 is in the non-combined position.

[0024] During assembly, the elastic clamping piece 42 of the shell 41 first passes through the coupling hole 81 of the circuit board 80, and then the circuit board 80 is moved toward the substrate 70 and pushes the shell 41 of the outer shell 4, and the shell 41 drives the cylinder 31 of the sleeve 3 to move toward the substrate 70 and press the compression spring 21 of the spring unit 2 and simultaneously move the steel ball 222 of the steel ball spring 22 away from the second limiting hole 34 and move toward the first limiting hole 33, and the elastic clamping piece 42 of the outer shell 4 is pushed by the protrusion 122 of the bearing 1 so that the elastic clamping piece 42 expands in the direction away from each other, and when it moves to the coupling position, the steel ball 222 of the steel ball spring 22 is stuck in the first limiting hole 33 and the elastic clamping piece 42 is pushed and expanded by the protrusion 122 of the bearing 1 to block the circuit board 80. At this time, the elastic clamping piece 42 is clamped and coupled to the circuit board 80. On the other hand, if the circuit board 80 is to be removed, since the housing 41 and the base 111 of the bearing 1 are at a distance of the preload gap d, the circuit board 80 only needs to be pushed against the housing 41 again in the direction of the substrate 70. The housing 41 will drive the barrel 31 of the sleeve 3 to further press the compression spring 21 of the spring unit 2 in the direction of the substrate 70, and after the steel ball 222 is moved out of the first limiting hole 33 in the first fixing portion 321 of the slide track 32, no force is applied to press the circuit board 80 against the housing 41. At this time, the elastic restoring force of the compression spring 21 will push the barrel 31 away from the substrate 70. The cylinder 31 is rotated in the direction away from the substrate 70, and during the rotation of the cylinder 31, the slide track 32 located in the cylinder 31 is synchronously moved relative to the steel ball 222 and the steel ball 222 is moved toward the second limiting hole 34 located in the second fixing portion 324 of the slide track 32. When the steel ball 222 is stuck in the second limiting hole 34 and the elastic clamping piece 42 of the housing 4 is not pushed by the protruding piece 122 of the bearing 1, at this time, the sleeve 3 is located in the non-combination position, and the elastic clamping piece 42 cannot block the circuit board 80, and the circuit board 80 can be detached. In the present embodiment, one side of the circuit board 80 has been integrated into the interior of the electronic device, so the circuit board 80 is passed through the elastic clamping member 42 of the shell 41 of the fixing device through the combining hole 81 and the circuit board 80 is blocked, so that the circuit board 80 is combined with the substrate 70. However, this is not limited to this. It is also possible to design the circuit board 80 to be completely combined with the substrate 70 according to actual needs. Therefore, the circuit board 80 is provided with multiple combining holes 81 and only needs to be fixed and combined with multiple fixing devices.In addition, in this embodiment, the fixing device is used to assemble and fix the circuit board 80 on the substrate 70, but it is not limited to this. According to actual usage needs, other types of fixing plates (not shown) can be combined with the substrate 70 through the fixing device, as long as the elastic clamping piece 42 of the shell 41 of the fixing device passes through and blocks the fixing plate to be combined so that the fixing plate can be combined with the substrate 70.

[0025] The elastic fastener 42 of the housing 4 can be fastened to the coupling hole 81 of the circuit board 80 and the sleeve 3 can be moved and linked so that the elastic fastener 42 of the housing 4 is pushed by the protrusion 122 of the bearing 1, and the elastic fastener 42 is fastened to the coupling hole 81 of the circuit board 80, and the design of the base 11 of the bearing 1 is combined with the substrate 70. When the sleeve 3 is moved to the coupling position, the steel ball 222 of the steel ball spring 22 is inserted into the first limiting hole 33 of the sleeve 3 and the elastic fastener 42 of the housing 4 is pushed and expanded by the protrusion 122 of the bearing 1 to block the circuit board 80. At this time, the elastic fastener 42 is fastened to the circuit board 80, so that the circuit board 80 is assembled and combined with the substrate 70, and the assembly is convenient and effective to achieve tool-free assembly operation.

[0026] It should be noted that, in this embodiment, the chute track 32 of the sleeve 3 further includes two first high portions 322, respectively located on the right side of the first fixing portion 321, two first low portions 323, respectively located on the left side of the first fixing portion 321, two second high portions 325, respectively located on the right side of the second fixing portion 324, and two second low portions 326, respectively located on the left side of the second fixing portion 324. Each first high portion 322, each first fixing portion 321, and each low portion cooperate to form a stepped shape, and each second high portion 325, each second fixing portion 324, and each second low portion 326 cooperate to form a stepped shape. The first limiting holes 33 are respectively disposed in the first fixing portion 321 of the chute track 32, and the second limiting holes 34 are respectively disposed in the second fixing portion 324 of the chute track 32. When the circuit board 80 is pushed against the shell 41 of the housing 4 toward the substrate 70, the shell 41 drives the cylinder 31 of the sleeve 3 to press the compression spring 21 of the spring unit 2 toward the substrate 70 and simultaneously moves the steel ball 222 of the steel ball spring 22 away from the second limiting hole 34. When the steel ball 222 moves away from the second limiting hole 34, it moves from the second fixing portion 324 through the second lower portion 326 and toward the first higher portion 322. After moving through the first higher portion 322, the steel ball 222 continues to move into the first fixing portion 321 and then to the first limiting hole 33. In other words, each second high portion 325, each second fixed portion 324 and each second low portion 326 of the slide track 32 of the sleeve 3 cooperate to present a stepped design from high to low, and since the second limiting hole 34 is located in the second fixed portion 324, when the steel ball 222 moves away from the second limiting hole 34, it will move from the second fixed portion 324 through the second low portion 326 and toward the first high portion 322, and after the steel ball 222 moves through the first high portion 322, it will continue to move into the first fixed portion 321 and then to the first limiting hole 33. Similarly, each first high portion 322, each first fixed portion 321 and each first low portion 323 of the slide track 32 of the sleeve 3 cooperate to present a stepped design from high to low, and since the first limiting hole 33 is located in the first fixed portion 321, when the steel ball 222 moves away from the first limiting hole 33, it will move from the first fixed portion 321 through the first low portion 323 and toward the second high portion 325, and after the steel ball 222 moves through the second high portion 325, it will continue to move into the second fixed portion 324 and then to the second limiting hole 34.In simple terms, each first high portion 322, each first fixed portion 321 and each first low portion 323 of the slide track 32 of the sleeve 3 cooperate to present a stepped design, and each second high portion 325, each second fixed portion 324 and each second low portion 326 cooperate to present a stepped design, thereby assisting the steel ball 222 to be moved in a single direction and causing the cylinder 31 to rotate in a single direction and move up and down, but not limited to this.

[0027] Furthermore, it should be noted that, in this embodiment, each elastic clamping member 42 includes an elastic arm 421 that extends gradually from the corresponding housing 41 toward the circuit board 80, and an elastic flange 422 that extends from the elastic arm 421 toward the circuit board 80. The elastic flange 422 cooperates to define a pushing space 423 in which the protruding member 122 extends. When the circuit board 80 is moved toward the substrate 70 and the coupling hole 81 of the circuit board 80 is passed through by the elastic flange 422 of the elastic clamp 42, and the circuit board 80 is pushed toward the substrate 70 against the shell 41 of the housing 4, the protrusion 122 of the bearing 1 pushes the elastic arm 421 and extends into the pushing space 423 and pushes the elastic flange 422, causing the elastic flanges 422 to expand away from each other, and when it reaches the coupling position, the elastic flange 422 is pushed and expanded by the protrusion 122 of the bearing 1 to block the circuit board 80. At this time, the elastic clamp 42 is clamped and coupled to the circuit board 80. That is to say, through the design of the elastic flange 422 of the elastic clamping member 42, which can be expanded to block the circuit board 80, after the elastic flange 422 of the elastic clamping member 42 passes through the circuit board 80, and the circuit board 80 pushes the shell 41 of the outer shell 4 toward the substrate 70, causing the cylinder 31 of the sleeve 3 to rotate downward, thereby causing the protrusion 122 of the bearing 1 to push the elastic arm 421 upward and extend into the pushing space 423 and push the elastic flange 422, and cause the elastic flange 422 to gradually expand away from each other. When the sleeve 3 moves to the combined position, the elastic flange 422 is pushed and expanded by the protrusion 122 of the bearing 1 to block the circuit board 80.

[0028] In summary, the fixing device of the present invention can fix the coupling hole 81 of the circuit board 80 by means of the elastic clamping piece 42 of the housing 4 and the sleeve 3 can be moved and linked so that the elastic clamping piece 42 of the housing 4 is pushed by the protrusion 122 of the bearing 1, and the design of the elastic clamping piece 42 is fixed and combined with the coupling hole 81 of the circuit board 80, and the base 11 of the bearing 1 is combined with the substrate 70. When the sleeve 3 is moved to the combining position, the elastic clamping piece 42 of the housing 4 is pushed and expanded by the protrusion 122 of the bearing 1 to block the circuit board 80, so that the circuit board 80 is assembled and combined with the substrate 70, and the assembly is convenient and effective to achieve tool-free assembly operation.

[0029] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A fixing device for assembling a circuit board on a substrate of an electronic device, wherein the circuit board has a coupling hole, and the fixing device is disposed on the substrate and extends from the substrate toward the circuit board, characterized in that: And includes: A bearing coupled to the substrate, comprising a base coupled to the substrate, and a rod extending from the base toward the circuit board, the rod having a body and a protruding piece extending from the body toward the coupling hole of the circuit board; a spring unit coupled to the bearing, comprising a compression spring longitudinally surrounding a rod sleeved with the bearing, and a steel ball spring transversely penetrating the bearing rod, the steel ball spring comprising an elastic body penetrating the rod, and two steel balls disposed at opposite ends of the elastic body, extending through the rod, and located on opposite sides of the rod; a sleeve surrounding the bearing and coupled to the spring unit, comprising a cylinder coupled to the steel ball spring of the spring unit, a slide track annularly arranged on the inner side of the cylinder and allowing the steel ball of the steel ball spring to slide, two first limiting holes disposed in the slide track and allowing the steel ball of the steel ball spring to removably enter, and two second limiting holes disposed in the slide track and allowing the steel ball of the steel ball spring to removably enter, the cylinder covering the bearing and being capable of pressing against the compression spring, the cylinder having a top portion penetrated by a protruding piece of the rod portion of the bearing; and A shell combined with the sleeve includes two shells combined with the outer side of the cylinder of the sleeve, and two elastic clamps extending from the shell toward the circuit board and capable of being removably clamped to the coupling hole of the circuit board, the elastic clamps surround the protrusion of the bearing and can be pushed by the protrusion to clamp the coupling hole, the sleeve can move between a coupling position and a non-coupling position relative to the steel ball of the steel ball spring, when in the coupling position, the first limiting hole of the sleeve is clamped by the steel ball of the steel ball spring and the elastic clamp of the shell is pushed by the protrusion of the bearing, and the elastic clamp is clamped to the coupling hole of the circuit board; when in the non-coupling position, the second limiting hole of the sleeve is clamped by the steel ball of the steel ball spring and the elastic clamp of the shell is not clamped by the bearing The protrusion of the bearing pushes the circuit board, and the circuit board is moved toward the direction of the substrate and the coupling hole of the circuit board is passed through the elastic clamping piece of the shell, and when the circuit board pushes the shell of the shell toward the direction of the substrate, the shell drives the cylinder of the sleeve to press the compression spring of the spring unit in the direction of the substrate and simultaneously makes the steel ball of the steel ball spring move away from the second limiting hole and move along the slide track and toward the direction of the first limiting hole, and makes the elastic clamping piece of the shell be pushed by the protrusion of the bearing so that the elastic clamping piece expands in the direction away from each other, and when it moves to the coupling position, the steel ball of the steel ball spring is stuck in the first limiting hole and the elastic clamping piece is pushed and expanded by the protrusion of the bearing to block the circuit board. At this time, the elastic clamping piece is fixedly coupled to the circuit board.

2. The fixing device according to claim 1, wherein: The chute track has two first fixing parts located on two opposite sides of the cylinder, and two second fixing parts located on two opposite sides of the cylinder, the two first fixing parts are located above the two second fixing parts, and each first fixing part is located between the two second fixing parts, the first limiting holes are respectively arranged in the two first fixing parts of the chute track, and the second limiting holes are respectively arranged in the two second fixing parts of the chute track.

3. The fixing device according to claim 2, wherein: The elastic clamping piece of the shell gradually extends from the shell toward the circuit board and surrounds the protrusion of the bearing. Each elastic clamping piece has an elastic arm gradually extending from the corresponding shell toward the circuit board, and an elastic flange extending from the elastic arm toward the circuit board. The elastic flanges cooperate to define a pushing space for the protrusion to be extended. When the circuit board is moved toward the substrate and the coupling hole of the circuit board is passed through by the elastic flange of the elastic clamping piece, and the circuit board pushes the shell of the shell toward the substrate, the protrusion of the bearing extends into the pushing space and pushes the elastic flange to expand away from each other. When it reaches the coupling position, the elastic flange is pushed and expanded by the protruding piece of the bearing to block the circuit board. At this time, the elastic clamping piece is fixedly coupled to the circuit board.

4. The fixing device according to claim 2, wherein: The chute track of the sleeve also includes two first high parts respectively located on the right side of the two first fixing parts, two first low parts respectively located on the left side of the two first fixing parts, two second high parts respectively located on the right side of the two second fixing parts, and two second low parts respectively located on the left side of the two second fixing parts, each first high part, each first fixing part and each low part cooperate to form a step shape, each second high part, each second fixing part and each second low part cooperate to form a step shape, the first limiting holes are respectively arranged in the two first fixing parts of the chute track, and the second limiting holes are respectively arranged in the two first fixing parts of the chute track, and the second limiting holes are respectively arranged in the two first fixing parts of the chute track. The holes are respectively arranged in the two second fixing parts of the slide track. When the circuit board is pushed against the shell of the outer shell in the direction of the substrate, the shell drives the cylinder of the sleeve to press the compression spring of the spring unit in the direction of the substrate and simultaneously moves the steel ball of the steel ball spring away from the second limiting hole. When the steel ball is moved away from the second limiting hole, it will move from the second fixing part through the second lower part and toward the first high part. After the steel ball is moved through the first high part, it will continue to move into the first fixing part and to the first limiting hole.

5. The fixing device according to claim 1, wherein: The base of the bearing is locked and combined on the base plate, and comprises a base seat combined on the base plate, and a locking piece extending from the base seat toward the base plate, penetrating the base plate, and locked and combined with the base plate.

6. The fixing device according to claim 5, characterized in that When in the combined position, the first limiting hole of the sleeve is clamped by the steel ball of the steel ball spring and the elastic clamping piece of the housing is pushed by the protruding piece of the bearing, and the elastic clamping piece is clamped and combined with the combining hole of the circuit board, and the shell of the housing and the base of the bearing are separated by a pre-load gap.

7. The fixing device according to claim 6, characterized in that When the cam is in the engaged position, the distance between the shell and the base of the bearing is within the pre-load gap, so the shell of the outer shell can be pushed toward the substrate. When the shell is pushed toward the substrate, the shell will drive the cylinder of the sleeve to move toward the substrate and further press the compression spring of the spring unit, and the steel ball will be moved out of the first limiting hole in the first fixing part of the slide track, and then the shell will not be pushed toward the substrate. At this time, the elastic restoring force of the compression spring will push the cylinder in the direction away from the substrate and cause the cylinder to rotate in the direction away from the substrate. During the rotation of the cylinder, the slide track in the cylinder will be moved relative to the steel ball and the steel ball will be moved toward the direction of the second limiting hole in the second fixing part of the slide track. When the steel ball is stuck in the second limiting hole, the sleeve is in the non-engaged position, and the elastic clamping piece is not pushed by the protruding piece of the bearing and the elastic clamping piece cannot block the circuit board.

8. The fixing device according to claim 1, wherein: The shell of the outer shell is glued to the outer side of the cylinder of the sleeve.

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