Double-screen hanger

Abstract

The utility model relates to a double-screen hanger, which comprises a central frame body, a left support arm and a right support arm, the central frame body is used for connecting the double-screen hanger on a target body, the right end of the left support arm and the left end of the right support arm are both pivotally arranged on the central frame body, and the right end of the left support arm and the left end of the right support arm are both pivotally arranged on the central frame body. The left supporting arm rotates towards or away from the right supporting arm around the right end of the left supporting arm, the right supporting arm rotates towards or away from the left supporting arm around the left end of the right supporting arm, the left supporting arm and the right supporting arm are each provided with an installation part, and each installation part is used for installing a display screen. And each mounting part can move relative to the corresponding support arm so as to adjust the corresponding display screen. According to the double-screen hanging frame, the function of hanging double screens on a single-arm display support can be achieved, adjustment is flexible and convenient, forward inclination is prevented, limiting is achieved, and the use experience of a user is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to display screen mounting technical field, especially a double screen hanger. BACKGROUND

[0002] The current market uses single-arm display stand to hang a single display, if hanging two displays, there will be single function, inconvenient to use and other problems.

[0003] Chinese utility model patent CN210165147U discloses a kind of electric lifting display stand, and its embodiment two specifically discloses the setting of two display hangers on its crossbar can make user install two computer displays, realize the multi-screen splicing of computer display;The setting of two sliding members on the crossbar can make user adjust the distance between two display hangers, so as to adjust the distance between spliced computer displays, which is very convenient to operate and meets the needs of different users.However, the patent has problems such as the angle of the cross arm cannot be adjusted, the display hanger is not easy to move and rotate, and the display is prone to sag.

[0004] Therefore, a double screen hanger that can hang double screens on a single-arm display stand and adjust flexibly and conveniently is needed. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model provides a double screen hanger that can hang double screens on a single-arm display stand, adjust flexibly and conveniently, and prevent forward tilting.

[0006] To achieve the above-mentioned purpose, the utility model provides a double screen hanger, which has the following technical solutions: a center frame body, a left support arm, and a right support arm, the center frame body is used to connect the double screen hanger to a target body, the right end of the left support arm and the left end of the right support arm are pivotally arranged on the center frame body, the left support arm rotates around its right end towards or away from the right support arm, and the right support arm rotates around its left end towards or away from the left support arm, the left support arm and the right support arm are both provided with mounting parts, each mounting part is used to mount a display screen, and each mounting part is movable relative to the corresponding support arm to adjust the corresponding display screen.

[0007] Preferably, the center frame body includes a frame body, an upper handle, and a lower handle, the upper handle is located at the top end of the frame body, and the lower handle is located at the bottom end of the frame body.

[0008] Preferably, the frame body is a square frame body.

[0009] Preferably, the right end of the left branch and the left end of the right branch are connected to the center frame through a pivot connection mechanism, the pivot connection mechanism comprises a connecting plate and a first mounting plate, the connecting plate and the first mounting plate are connected and the center frame is adjustably clamped between the connecting plate and the first mounting plate, the first mounting plate is used to mount the double-screen hanging frame on the target body, the connecting plate is provided with a first vertical hole and a second vertical hole, the right end of the left branch is provided with a third vertical hole, the left end of the right branch is provided with a fourth vertical hole, the first vertical hole and the third vertical hole are connected through a first rotating shaft, so that the left branch can rotate around the first rotating shaft, the second vertical hole and the fourth vertical hole are connected through a second rotating shaft, so that the right branch can rotate around the second rotating shaft.

[0010] Preferably, the first vertical hole comprises an upper first vertical hole and a lower first vertical hole spaced from the upper first vertical hole, the third vertical hole is mounted between the upper first vertical hole and the lower first vertical hole, the upper first vertical hole, the lower first vertical hole, the third vertical hole and the first rotating shaft are coaxial; the second vertical hole comprises an upper second vertical hole and a lower second vertical hole spaced from the upper second vertical hole, the fourth vertical hole is mounted between the upper second vertical hole and the lower second vertical hole, the upper second vertical hole, the lower second vertical hole, the fourth vertical hole and the second rotating shaft are coaxial.

[0011] Preferably, the center axes of the first vertical hole and the second vertical hole are located on the plane of the connecting plate, the center axis of the third vertical hole is spaced from the plane of the left branch, and the center axis of the fourth vertical hole is spaced from the plane of the right branch, so that the left branch and the right branch can be independently rotated to be parallel to the connecting plate.

[0012] Preferably, the mounting part comprises a movable assembly and a sliding groove, the movable assembly comprises a second mounting plate, a front rotating block and a rear rotating block, the second mounting plate is connected to the front side of the front rotating block, the second mounting plate is used to mount the display screen, the rear side of the front rotating block is provided with a rear boss, the front side of the rear rotating block is provided with a front boss, the rear boss passes through the sliding groove and is connected to the front boss, and the front boss and the rear boss form a movable shaft of the movable assembly, the movable assembly can be moved along the sliding groove through the movable shaft; and the front rotating block and the rear rotating block clamp the corresponding branch between the front rotating block and the rear rotating block through a fastener, and the corresponding display screen can be rotatably adjusted as a whole around the center axis of the movable shaft by loosening or tightening the fastener.

[0013] Preferably, the sliding groove is distributed along the longitudinal axis of the corresponding supporting arm, and the central axis of the movable shaft is perpendicular to the longitudinal axis of the corresponding supporting arm.

[0014] Preferably, a first positioning assembly is arranged between the second mounting plate and the front side of the front rotating block, and a second positioning assembly is arranged between the front boss and the rear boss, so that the corresponding display screen rotates and moves as a whole with the second mounting plate, the front rotating block and the rear rotating block through the first positioning assembly and the second positioning assembly.

[0015] Preferably, the fastener comprises a locking screw and a gasket.

[0016] Preferably, the double-screen hanging rack comprises a limiting ring, one limiting ring is arranged in each sliding groove, the limiting ring is an annular ring with a central hole, the limiting ring is movable along the sliding groove, the annular ring has an opening in the circumferential direction, the limiting ring has an open state and a closed state by rotating the annular ring around the central axis of the annular ring, in the open state, the opening is rotated to be aligned with the sliding groove so that the central hole is in communication with the sliding groove, in the closed state, the opening is rotated to the side wall of the sliding groove so that the central hole is not in communication with the sliding groove, the central hole of the limiting ring is convenient to pass through and limit the electric wire by switching the open state and the closed state of the limiting ring.

[0017] The double-screen hanging rack can realize the function of hanging double screens on a single-arm display stand, is flexible and convenient to adjust, prevents forward inclination and effectively expands the use experience of users. BRIEF DESCRIPTION OF DRAWINGS

[0018] To make the technical solutions in the embodiments of the present application clearer, the drawings needed in the embodiments are briefly introduced as follows.

[0019] Figure 1 FIG. 1 is a first structural schematic view of the double-screen hanging rack in application.

[0020] Figure 2 FIG. 2 is a front view of the double-screen hanging rack. Figure 1

[0021] FIG. 3 is a structural schematic view of adjusting the angle of the supporting arm when the double-screen hanging rack is in application. Figure 3

[0022] FIG. 4 is a structural schematic view of rotating and adjusting the display screen when the double-screen hanging rack is in application. Figure 4

[0023] Figure 5 ​This is a structural diagram of the dual-screen bracket of the present invention for horizontally moving and adjusting the display screen when in use.

[0024] Figure 6 This is a second structural schematic diagram of the dual-screen bracket of the present invention when the left arm and the right arm are fully extended (the display screen is not shown).

[0025] Figure 7 This is an exploded view of the dual-screen mount of the present invention.

[0026] Figure 8 This is a cross-sectional view of the dual-screen hanger of the present invention when the left arm and the right arm are fully extended.

[0027] Figure 9 for Figure 1 Cross-sectional view of the state.

[0028] Figure 10 for Figure 9 A partial enlarged schematic diagram of the middle circle position.

[0029] Figure 11 This is an exploded schematic diagram of the mounting portion of the dual-screen bracket of the present invention.

[0030] Figure 12 This is a cross-sectional view of the dual-screen hanger of the present invention when the mounting portion and the support arm are in cooperation.

[0031] Figure 13 This is a schematic structural diagram of the limiting ring in the dual-screen hanger of the present utility model. DETAILED DESCRIPTION

[0032] In order to more clearly describe the technical content of the present invention, it is further described below in conjunction with specific embodiments.

[0033] In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0034] In the description of the utility model, need explanation further, unless another explicit provision and limitation, term " set " " install " " link " " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connected, can be two element inside the intercommunication。For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0035] As Figures 1 to 13 Indicated, for the specific embodiment of the double screen hanging rack of the utility model. Wherein, the double screen hanging rack is used to adjustably install two display screens in single-arm display support 100. In the description of the utility model, with the orientation of display screen user using display screen as " front " " back " " left " " right " orientation judgment, for example, with the left of display screen user using or watching display screen as " left " orientation in the utility model. Therefore, with the orientation of display screen user using display screen, as Figure 1 Indicated, the double screen hanging rack 200 of the utility model installs left display screen 300 and right display screen 400 on single-arm display support 100 located at the back of display screen hanging rack 200.

[0036] The double screen hanging rack 200 of the utility model can realize: as Figure 3 Indicated, by rotating adjustment, the relative angle between left display screen 300 and right display screen 400 can be changed;As Figure 4 Indicated, by rotating adjustment, the horizontal screen and vertical screen state of left display screen 300 and right display screen 400 can be switched;As Figure 5 Indicated, by horizontal movement adjustment, the interval between left display screen 300 and right display screen 400 can be changed. It is convenient to satisfy different display size, different installation position, so that the position of double screen computer can be conveniently adjusted when using.

[0037] As Figure 6As shown, the double-screen hanging rack 200 includes a center rack body 210, a left supporting arm 220 and a right supporting arm 230, the center rack body 210 is used to connect the double-screen hanging rack 200 on the target body single-arm display support 100, the right end of the left supporting arm 220 and the left end of the right supporting arm 230 are pivotally arranged on the center rack body 210, and the left supporting arm 220 rotates around the right end of the left supporting arm 220 towards or away from the right supporting arm 230, the right supporting arm 230 rotates around the left end of the right supporting arm 230 towards or away from the left supporting arm 220, the left supporting arm 220 and the right supporting arm 230 are provided with mounting portions 250, each mounting portion 250 is used to mount a display screen, for example, the right display screen 400 is mounted on the right supporting arm 230 through the mounting portion 250 located on the right side, and each mounting portion 250 is movable relative to the corresponding supporting arm to adjust the corresponding display screen, specifically, the mounting portion located on the left side is movably adjusted to the left display screen 300 relative to the left supporting arm 220, and the mounting portion located on the right side is movably adjusted to the right display screen 400 relative to the right supporting arm 230.

[0038] As shown in the figure, Figure 7 The center rack body 210 includes a frame body 211, an upper handle 212 and a lower handle 213, the upper handle 212 is located at the top end of the frame body 211, and the lower handle 213 is located at the bottom end of the frame body 211. In this embodiment, the frame body 211 is a square frame body, that is, a square frame body composed of two vertical rods and two horizontal rods, an oval-shaped upper handle is formed on the upper horizontal rod, and an oval-shaped lower handle is formed on the lower horizontal rod. The user can easily control the entire double-screen hanging rack to move up and down, left and right, and adjust the front and rear inclination angles and the elevation angles through the upper handle and the lower handle.

[0039] As shown in the figure, Figure 6 And Figure 7 The right end of the left supporting arm 220 and the left end of the right supporting arm 230 are connected with the center rack body 210 through a pivoting connection mechanism 240, the pivoting connection mechanism 240 includes a connecting plate 242 and a first mounting plate 241, the connecting plate 242 and the first mounting plate 241 are fixedly connected through four screws, and the center rack body 210 is adjustably clamped between the connecting plate 242 and the first mounting plate 241. The center rack body 210 can be adjusted to the appropriate position by loosening the four screws, locking the screws, and then using the handle of the center rack body 210 to easily control the entire double-screen hanging rack. The center rack body 210 can adjust the position of the upper and lower installation according to the actual needs, that is, change the clamping point.

[0040] The first mounting plate 241 is used for mounting the double-screen hanging rack 200 on the target body single-arm display support 100. The connecting plate 242 is provided with a first vertical hole 245 and a second vertical hole 246. The right end of the left supporting arm 220 is provided with a third vertical hole 243. The left end of the right supporting arm 230 is provided with a fourth vertical hole 244. The first vertical hole 245 and the third vertical hole 243 are connected through a first rotating shaft 247, so that the left supporting arm 220 can rotate around the first rotating shaft 247. The second vertical hole 246 and the fourth vertical hole 244 are connected through a second rotating shaft 248, so that the right supporting arm 230 can rotate around the second rotating shaft 248.

[0041] As shown in Figure 6 and Figure 10 The first vertical hole 245 comprises an upper first vertical hole and a lower first vertical hole spaced from the upper first vertical hole. The third vertical hole 243 is mounted between the upper first vertical hole and the lower first vertical hole. The upper first vertical hole, the lower first vertical hole, the third vertical hole 243 and the first rotating shaft 247 are coaxial. The second vertical hole 246 comprises an upper second vertical hole and a lower second vertical hole spaced from the upper second vertical hole. The fourth vertical hole 244 is mounted between the upper second vertical hole and the lower second vertical hole. The upper second vertical hole, the lower second vertical hole, the fourth vertical hole 244 and the second rotating shaft 248 are coaxial.

[0042] As shown in Figure 7 and Figure 10 The central axes of the first vertical hole 245 and the second vertical hole 246 are located on the plane of the connecting plate 242. The central axis of the third vertical hole 243 is spaced from the plane of the left supporting arm 220. The central axis of the fourth vertical hole 244 is spaced from the plane of the right supporting arm 230. As shown in Figure 6 and Figure 8 The left supporting arm 220 and the right supporting arm 230 can be independently rotated to be parallel to the connecting plate 242.

[0043] Based on the setting of the pivotal connection mechanism 240, the first rotating shaft 247 and the second rotating shaft 248 can be used as rotating shafts to freely rotate the left supporting arm 220 and the right supporting arm 230 outward or inward within a certain range of angle α. The maximum outward rotation angle can be limited by the limiting boss of the connecting plate, and the maximum inward rotation angle can be limited by the plane of the connecting plate, so that the user can easily stop at different positions, and the use experience of the user is effectively expanded.

[0044] As shown in Figure 6 and Figure 7 The mounting part 250 comprises a movable assembly 251 and a sliding groove 252. As shown inFigure 11 and Figure 12 As shown in the figure, the movable assembly 251 includes a second mounting plate 255, a front rotating block 254 and a rear rotating block 253. The second mounting plate 255 is connected to the front side of the front rotating block 254. The second mounting plate 255 is used to mount the display screen, i.e. the second mounting plate on the left support arm 220 is used to mount the left display screen 300, and the second mounting plate on the right support arm 230 is used to mount the right display screen 400. The rear side of the front rotating block 254 is provided with a rear boss 256, and the front side of the rear rotating block 253 is provided with a front boss 257. The rear boss 256 passes through the sliding groove 252 and is connected to the front boss 257. The front boss 257 and the rear boss 256 form the movable shaft of the movable assembly 251. Through the movable shaft, the movable assembly 251 can be horizontally moved along the sliding groove 252 to adjust the distance between the left and right display screens, as shown in the figure. Figure 5 The front rotating block 254 and the rear rotating block 253 clamp the corresponding support arm between them through fasteners. By tightening or loosening the fasteners, the corresponding display screen can be rotated and adjusted along with the movable assembly 251 as a whole, with the central axis of the movable shaft as the rotation axis, as shown in the figure. Figure 4 The sliding groove 252 is distributed along the longitudinal axis of the corresponding support arm, and the central axis of the movable shaft is perpendicular to the longitudinal axis of the corresponding support arm.

[0045] The first positioning assembly is provided between the second mounting plate 255 and the front side of the front rotating block 254, and the second positioning assembly is provided between the front boss 257 and the rear boss 256. Through the first positioning assembly and the second positioning assembly, the corresponding display screen can rotate and move along with the second mounting plate 255, the front rotating block 254 and the rear rotating block 253 as a whole.

[0046] As shown in the figure, in this embodiment, the first positioning assembly and the second positioning assembly use the waist-shaped hole and the waist-shaped block to position, so that the second mounting plate 255, the front rotating block 254 and the rear rotating block 253 form a whole to rotate and move together. For example, the front rotating block 254 is provided with a waist-shaped block 259, and the second mounting plate 255 is provided with a matching waist-shaped hole that can be buckled with the waist-shaped block 259. For the positioning of the waist-shaped hole and the waist-shaped block buckling used in this embodiment, rivets or screws can also be used for fastening, or other fastener solutions can be added.

[0047] As shown in the figure, in this embodiment, the first positioning assembly and the second positioning assembly use the waist-shaped hole and the waist-shaped block to position, so that the second mounting plate 255, the front rotating block 254 and the rear rotating block 253 form a whole to rotate and move together. For example, the front rotating block 254 is provided with a waist-shaped block 259, and the second mounting plate 255 is provided with a matching waist-shaped hole that can be buckled with the waist-shaped block 259. For the positioning of the waist-shaped hole and the waist-shaped block buckling used in this embodiment, rivets or screws can also be used for fastening, or other fastener solutions can be added. Figure 11 In this embodiment, as shown in the figure, the first positioning assembly and the second positioning assembly use the waist-shaped hole and the waist-shaped block to position, so that the second mounting plate 255, the front rotating block 254 and the rear rotating block 253 form a whole to rotate and move together. For example, the front rotating block 254 is provided with a waist-shaped block 259, and the second mounting plate 255 is provided with a matching waist-shaped hole that can be buckled with the waist-shaped block 259. For the positioning of the waist-shaped hole and the waist-shaped block buckling used in this embodiment, rivets or screws can also be used for fastening, or other fastener solutions can be added.

[0048] Figure 11 and Figure 12 ​As shown, the fastener includes a locking screw 258 and a washer.

[0049] Based on the installation part of the utility model for the setting, through the locking screw 258, when the display screen needs to rotate, for example, the switching between horizontal screen and vertical screen or the switching of intermediate position, the display screen and the movable assembly 251 form a whole and rotate synchronously, and will not loosen in the free rotation process;When the display screen needs to move horizontally, adjust through the locking screw loosening or locking, the display screen and the movable assembly 251 form a whole and move horizontally along the sliding groove synchronously, and will not affect the tightness during movement.

[0050] As shown in Figure 6 and Figure 13 As shown, the double-screen hanging rack 200 includes a limiting ring 260, and one limiting ring 260 is installed in each sliding groove, as shown in Figure 13 As shown, the limiting ring 260 is an annular ring 261 with a central hole 263, and the limiting ring 260 is movable along the sliding groove, in order to facilitate the movement of the limiting ring 260 along the sliding groove, a groove 264 can be arranged on the circumference of the annular ring 261, and the groove wall of the sliding groove is clamped through the groove 264. The annular ring 261 has an opening 262 in the circumferential direction, the annular ring 261 is rotated around the central axis of the annular ring 261, so that the limiting ring 260 has an open state and a closed state, in the open state, the opening 262 is rotated to align with the sliding groove, so that the central hole 263 is in communication with the sliding groove;In the closed state, the opening 262 is rotated to the side wall of the sliding groove, so that the central hole 263 is not in communication with the sliding groove, as shown in Figure 2 As shown, through the switching of the open state and the closed state of the limiting ring 260, the central hole 263 of the limiting ring 260 can be arranged and limited.

[0051] Based on the limiting ring 260 of the utility model for the setting, the data line and the power line of the display screen can be clamped into the central hole 263 through the opening 262 of the limiting ring 260, and then the opening 262 of the limiting ring 260 is rotated to overlap with any position of the side wall of the sliding groove, which can effectively fix each wire and prevent it from coming out.

[0052] The double-screen hanging rack of the utility model can realize the function of hanging double screens on a single-arm display stand, is flexible and convenient to adjust, prevents forward inclination and limiting, and effectively expands the use experience of users.

[0053] In this specification, the present application has been described with reference to specific embodiments thereof. It is, however, apparent that various modifications and changes can be made thereto without departing from the spirit and scope of the present application. Therefore, the specification and drawings should be considered in an illustrative, and not a restrictive, sense.

Claims

1. A dual-screen rack, characterized in that: It includes a central frame, a left arm and a right arm. The central frame is used to connect the dual-screen hanger to the target object. The right end of the left arm and the left end of the right arm are both pivotally set on the central frame, and the left arm rotates toward or away from the right arm around the right end of the left arm, and the right arm rotates toward or away from the left arm around the left end of the right arm. The left arm and the right arm are both provided with mounting parts, each of the mounting parts is used to install a display screen, and each of the mounting parts is movable relative to the corresponding arm to adjust the corresponding display screen.

2. The dual-screen rack according to claim 1, characterized in that: The central frame comprises a frame, an upper handle and a lower handle, wherein the upper handle is located at the top end of the frame, and the lower handle is located at the bottom end of the frame.

3. The dual-screen rack according to claim 2, characterized in that: The frame is a square frame.

4. The dual-screen rack according to claim 1, characterized in that: The right end of the left support arm and the left end of the right support arm are connected to the central frame through a pivot connection mechanism, and the pivot connection mechanism includes a connecting plate and a first mounting plate, the connecting plate and the first mounting plate are connected and the central frame is adjustably clamped between the connecting plate and the first mounting plate, and the first mounting plate is used to install the dual-screen bracket on the target body, and a first vertical hole and a second vertical hole are provided on the connecting plate, a third vertical hole is provided on the right end of the left support arm, and a fourth vertical hole is provided on the left end of the right support arm, and the first vertical hole and the third vertical hole are connected by a first rotating shaft, so that the left support arm can rotate around the first rotating shaft, and the second vertical hole and the fourth vertical hole are connected by a second rotating shaft, so that the right arm can rotate around the second rotating shaft.

5. The dual-screen rack according to claim 4, characterized in that: The first vertical hole includes an upper first vertical hole and a lower first vertical hole spaced apart from the upper first vertical hole, the third vertical hole is installed between the upper first vertical hole and the lower first vertical hole, and the upper first vertical hole, the lower first vertical hole, the third vertical hole, and the first rotating shaft are coaxial; the second vertical hole includes an upper second vertical hole and a lower second vertical hole spaced apart from the upper second vertical hole, the fourth vertical hole is installed between the upper second vertical hole and the lower second vertical hole, and the upper second vertical hole, the lower second vertical hole, the fourth vertical hole, and the second rotating shaft are coaxial.

6. The dual-screen rack according to claim 4, characterized in that: The central axes of the first and second vertical holes are located on the plane where the connecting plate is located, the central axis of the third vertical hole is spaced apart from the plane where the left arm is located, and the central axis of the fourth vertical hole is spaced apart from the plane where the right arm is located, so that the left arm and the right arm can be independently rotated to be parallel to the connecting plate.

7. The dual-screen rack according to claim 1, characterized in that: The cam is connected to the front of the second mounting plate and the rear mounting plate is connected to the front of the second mounting plate, and the cam is connected to the front of the second mounting plate and the rear mounting plate is connected to the front of the second mounting plate.

8. The dual-screen rack according to claim 7, characterized in that: The sliding grooves are distributed along the longitudinal axis of the corresponding support arms, and the central axis of the movable shaft is perpendicular to the longitudinal axis of the corresponding support arms.

9. The dual-screen rack according to claim 7, characterized in that: A first positioning assembly is provided between the second mounting plate and the front side of the front rotating block, and a second positioning assembly is provided between the front boss and the rear boss. Through the first positioning assembly and the second positioning assembly, the corresponding display screen rotates and moves as a whole with the second mounting plate, the front rotating block and the rear rotating block.

10. The dual-screen rack according to claim 7, characterized in that: The fasteners include locking screws and washers.

11. The dual-screen rack according to claim 7, characterized in that: The dual-screen hanger includes a limiting ring, and each of the limiting rings is installed in the slide groove. The limiting ring is an annular ring with a center hole. The limiting ring is movable along the slide groove. The annular ring has an opening in the circumference. By rotating the annular ring around the center axis of the annular ring, the limiting ring has an open state and a closed state. In the open state, the opening is rotated and aligned with the slide groove so that the center hole is connected to the slide groove; in the closed state, the opening is rotated to the side wall of the slide groove so that the center hole is not connected to the slide groove. By switching the open state and the closed state of the limiting ring, the center hole of the limiting ring is easily penetrated and the limiting wire is conveniently positioned.

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