Desktop tilting locking structure and noon break desk

Abstract

The utility model provides a desktop tilting locking structure and a noon break desk. The table top inclined turning locking structure comprises a fixing piece and a supporting piece, and the fixing piece is arranged on the table top plate and moves up and down along with rotation of the table top plate. Positioning protrusions are arranged on the faces, facing the transverse pipe, of the supporting pieces, and the tops of the supporting pieces are hinged to the fixing pieces; in the horizontal state, the lower side of the positioning protrusion abuts against the upper side of the transverse pipe so as to limit the rear end of the table top plate from rotating downwards. In the inclined turning state, the upper side of the positioning protrusion abuts against the lower side of the transverse pipe so as to limit upward rotation of the rear end of the table top plate. The upper side and the lower side of the positioning protrusion abut against the transverse pipe in the vertical direction, and the position of the table top plate can be locked; by rotating the supporting piece, the positioning protrusion can move in the front-back direction, the positioning protrusion moves away from the position over or under the transverse rod, position locking of the table top plate is relieved, the table top plate can rotate, use is convenient, and the position of the table top plate can be reliably locked.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of desk, especially a desk surface oblique flip locking structure and noon break desk. BACKGROUND

[0002] The noon break is essential for the healthy growth of students. After a morning of learning, students need to rest to replenish physical energy, but the noon break time is short, and it is not easy for students to go back and forth, so most students will take a nap in the classroom. In view of this situation, there are now many desks for students to take classes and have a noon break to help students get better sleep quality during the noon break.

[0003] The noon break desk in the prior art uses the oblique flip of the desktop panel as a headrest for the front row of students during the noon break. The desktop panel lacks a reliable locking structure, making it impossible to reliably lock the desktop panel in a horizontal or oblique flip state, causing inconvenience. UTILITY MODEL CONTENT

[0004] The utility model provides a desk surface oblique flip locking structure and noon break desk, which can reliably lock the desktop panel in a horizontal and oblique flip state, and is convenient to use.

[0005] On the one hand, the utility model provides a desk surface oblique flip locking structure for locking the rotational position between the desktop panel and the desk pipe frame in the noon break desk, the desk pipe frame includes a horizontal pipe, the desk surface oblique flip locking structure includes a fixing part and a support part, the fixing part is arranged on the desktop panel and moves up and down with the rotation of the desktop panel, one side of the support part facing the horizontal pipe is provided with a positioning protrusion, and the top of the support part is hinged with the fixing part to enable the positioning protrusion to move close to or away from the horizontal pipe in the front-back direction.

[0006] When the desktop panel is in a horizontal state, the lower side of the positioning protrusion abuts against the upper side of the horizontal pipe to limit the downward rotation of the rear end of the desktop panel.

[0007] When the desktop panel is rotated to an oblique flip state, the upper side of the positioning protrusion abuts against the lower side of the horizontal pipe to limit the upward rotation of the rear end of the desktop panel.

[0008] Among them, the desk surface oblique flip locking structure further includes an elastic part, the elastic part is arranged between the fixing part and the support part, and is used for providing an elastic force to enable the support part to rotate towards the horizontal pipe and abut against the horizontal pipe.

[0009] The positioning protrusion is a strip-shaped protrusion arranged along the transverse direction; the upper side surface of the positioning protrusion and the lower side surface of the horizontal pipe are both planar and are in close contact with each other in the tilted state; the upper side surface of the horizontal pipe is a convex arc, and the lower side of the connecting portion of the positioning protrusion and the support is a concave arc matched with the convex arc.

[0010] The fixing member is a plate-shaped member, and the upper surface of the fixing member is fixedly connected to the lower surface of the desktop panel; the fixing member is provided with an arc-shaped groove; the top of the support is provided with a hinge block, and a rotating shaft is integrally formed on the hinge block; the rotating shaft is rotatably arranged in the arc-shaped groove; and the fixing member is provided with a through hole at positions corresponding to the arc-shaped groove and the hinge block, and the through hole penetrates through the upper surface of the fixing member.

[0011] The hinge block is located on one side of the support close to the horizontal pipe; the top of the support is provided with a blind hole on the side away from the horizontal pipe; the lower surface of the fixing member is provided with a limiting protruding column; and the elastic member is a compression spring, one end of which is arranged in the blind hole and the other end of which is sleeved on the limiting protruding column.

[0012] The desktop pipe rack is provided with a book holder, and the support is located between the book holder and the horizontal pipe.

[0013] The support is a shell-shaped member, and the side of the support away from the horizontal pipe is open; the support is provided with reinforcing ribs arranged along the transverse direction, and each reinforcing rib extends along the vertical direction.

[0014] In addition, the utility model provides a lunch break desk, including desktop panel, desktop pipe rack, book holder and aforementioned desktop tilting locking structure, the book holder and the desktop panel all set up on desktop pipe rack, the desktop tilting locking structure connects between the desktop panel and the desktop pipe rack.

[0015] The book holder is provided with a rotating shaft hole, the lower surface of the desktop panel is provided with an anti-swing member, the anti-swing member is provided with a positioning column and a stabilizing plate, the positioning column is rotatably connected with the rotating shaft hole, the stabilizing plate is located at one end of the positioning column away from the rotating shaft hole, and the stabilizing plate is vertically arranged and closely attached to the inner wall of the book holder.

[0016] The book holder is provided with a hinge seat, the hinge seat is provided with a positioning groove, the top surface of the positioning groove and the side adjacent to the inner side of the book holder are open, the rotating shaft hole is arranged on the hinge seat and one end of the rotating shaft hole is communicated with the positioning groove, the positioning column is arranged in the positioning groove, a rotating screw is arranged in the rotating shaft hole, and the rotating screw is threadedly connected with the positioning column.

[0017] The desktop inclined flip locking structure and the lunch break desk provided by the utility model can lock the position of the desktop panel through the abutment of the upper and lower sides of the positioning protrusion with the horizontal pipe in the vertical direction; the positioning protrusion can be moved in the front and back directions through the rotation of the supporting piece, and the supporting piece and the fixing piece can be moved up and down, so that the position locking of the desktop panel is released, the desktop panel can be rotated, and the position of the desktop panel can be reliably locked. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The lunch break desk in the horizontal state of the preferred embodiment of the utility model is shown in the structural schematic diagram;

[0019] Figure 2 is Figure 1 The lunch break desk in the inclined flip state of the preferred embodiment of the utility model is shown in the structural schematic diagram;

[0020] Figure 3 is Figure 1 The cooperation of the desktop inclined flip locking structure and the horizontal pipe of the lunch break desk in the horizontal state in the preferred embodiment of the utility model is shown in the schematic diagram;

[0021] Figure 4 is Figure 2 The cooperation of the desktop inclined flip locking structure and the horizontal pipe of the lunch break desk in the inclined flip state in the preferred embodiment of the utility model is shown in the schematic diagram;

[0022] Figure 5 is Figure 1 The exploded schematic diagram of the desktop inclined flip locking structure in the preferred embodiment of the utility model is shown in the schematic diagram;

[0023] Figure 6 is Figure 5 The exploded schematic diagram of the desktop inclined flip locking structure in the preferred embodiment of the utility model is shown in the schematic diagram;

[0024] Figure 7 is Figure 5 The structural schematic diagram of the supporting piece of the desktop inclined flip locking structure in the preferred embodiment of the utility model is shown in the schematic diagram;

[0025] Figure 8 is Figure 1 The structural schematic diagram of the book holder of the lunch break desk in the preferred embodiment of the utility model is shown in the schematic diagram;

[0026] Figure 9 is Figure 1 The structural schematic diagram of the anti-swing piece of the lunch break desk in the preferred embodiment of the utility model is shown in the schematic diagram. DETAILED DESCRIPTION

[0027] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application.

[0028] In the drawings, similar elements are denoted by the same reference numerals.

[0029] As shown in Figure 1 and Figure 2 , the present application provides a lunch desk, which comprises a desktop panel 1, a desk pipe frame 2, a book holder 4 and a desktop inclined locking structure 3. The book holder 4 and the desktop panel 1 are arranged on the desk pipe frame 2. The desktop panel 1 can rotate relative to the desk pipe frame 2 and the book holder 4 to switch between a horizontal state and an inclined state. The desktop panel 1 can be used for students to learn in the horizontal state, and can be used as a headrest for front-row students to have lunch in the inclined state. The desktop inclined locking structure 3 is connected between the desktop panel 1 and the desk pipe frame 2, and is used for locking the rotating position between the desktop panel 1 and the desk pipe frame 2, so as to realize the position locking of the desktop panel 1 in the horizontal state and the inclined state.

[0030] The desk pipe frame 2 comprises a horizontal pipe 21 and two upper pipes 22. The horizontal pipe 21 is connected between the two upper pipes 22 to form an upper half of the desk pipe frame 2, and is used for fixing the book holder 4 and connecting the desktop panel 1, and is supported for fixing.

[0031] As shown in Figure 3 , Figure 4 , the desktop inclined locking structure 3 comprises a fixing member 31, a supporting member 32 and an elastic member 33. The fixing member 31 is located above the horizontal pipe 21 and is arranged on the desktop panel 1 and moves up and down with the rotation of the desktop panel 1. One side of the supporting member 32 facing the horizontal pipe 21 is provided with a positioning protrusion 321. The top of the supporting member 32 is hinged to the fixing member 31, so that the positioning protrusion 321 moves close to or away from the horizontal pipe 21 in the front-back direction. The elastic member 33 is arranged between the fixing member 31 and the supporting member 32, and is used for providing an elastic force to make the supporting member 32 rotate towards the horizontal pipe 21 and abut against the horizontal pipe 21.

[0032] When the desktop panel 1 is in the horizontal state, as shown in Figure 3 , the lower side of the positioning protrusion 321 abuts against the upper side of the horizontal pipe 21 to limit the rear end of the desktop panel 1 from rotating downward, so that the desktop panel 1 can be locked in the horizontal state.

[0033] When the desktop panel 1 rotates to the inclined state, as shown in Figure 4As shown, the upper side of the positioning protrusion 321 abuts against the lower side of the horizontal pipe 21 to limit the upward rotation of the rear end of the tabletop panel 1, so that the tabletop panel 1 can be locked in the inclined state.

[0034] By the abutment of the upper and lower sides of the positioning protrusion 321 with the horizontal pipe 21 in the vertical direction, the position of the tabletop panel 1 can be locked to facilitate use.

[0035] When the horizontal state of the tabletop panel 1 is unlocked, the support member 32 is rotated to overcome the elastic force of the elastic member 33, so that the positioning protrusion 321 moves away from the horizontal pipe 21 in the front-rear direction, and the positioning protrusion 321 can move away from directly above the horizontal pipe. At this time, the fixing member 31 and the support member 32 can move downward, so that the rear end of the tabletop panel 1 can rotate downward, i.e., the horizontal state of the tabletop panel 1 is unlocked, and the tabletop panel 1 can be rotated to the inclined state.

[0036] When the tabletop panel 1 is rotated to the inclined state, the positioning protrusion 321 moves downward to the lower side of the horizontal pipe 21, and under the action of the elastic force of the elastic member 33, the support member 32 rotates towards the horizontal pipe 21, the positioning protrusion 321 moves to directly below the horizontal pipe 21, and the upper side of the positioning protrusion 321 abuts against the lower side of the horizontal pipe 21, so that the support member 32 and the fixing member 31 cannot move upward, and further, the rear end of the tabletop panel 1 cannot move upward, i.e., the tabletop panel 1 cannot be rotated, thereby locking the tabletop panel 1 in the inclined state.

[0037] When the inclined state needs to be unlocked, the support member 32 is rotated to overcome the elastic force of the elastic member 33, so that the positioning protrusion 321 moves away from directly below the horizontal pipe 21 in the front-rear direction, and the support member 32 and the fixing member 31 can move upward, so that the rear end of the tabletop panel 1 can rotate upward, i.e., the inclined state of the tabletop panel 1 is unlocked, and the tabletop panel 1 can be rotated to the horizontal state.

[0038] When the tabletop panel 1 is rotated to the horizontal state, the fixing member 31 and the support member 32 move upward with the rear end of the tabletop panel 1, the positioning protrusion 321 moves to the upper side of the horizontal pipe 21 in the vertical direction, and under the action of the elastic force of the elastic member 33, the support member 32 rotates towards the horizontal pipe 21, the positioning protrusion 321 moves to directly above the horizontal pipe 21, and the lower side of the positioning protrusion 321 abuts against the upper side of the horizontal pipe 21, thereby locking the tabletop panel 1 in the horizontal state.

[0039] Since the top of the support member 32 is hinged to the fixing member 31, by rotating the support member 32, the positioning protrusion 321 can move in the front-rear direction, the positioning protrusion 321 moves away from directly above or below the horizontal pipe, and the support member 32 and the fixing member 31 can move upward and downward, thereby unlocking the position of the tabletop panel 1, and the tabletop panel 1 can be rotated, which is convenient to use and can reliably lock the position of the tabletop panel 1.

[0040] The positioning protrusion 321 is in the shape of a strip arranged in the transverse direction, so as to increase the contact area between the positioning protrusion 321 and the horizontal pipe 21, and improve the reliability and stability when the two are in abutment.

[0041] The upper side surface of the positioning protrusion 321 and the lower side surface of the horizontal pipe 21 are both planar, and are in abutment in the tilted state, so as to ensure the reliability of the abutment of the two in the tilted state.

[0042] The upper side surface of the horizontal pipe 21 is in the shape of a convex arc, and the lower side of the connecting portion of the positioning protrusion 321 and the support 32 is in the shape of a concave arc matched with the convex arc, so that the contact area is large when the two are in abutment, and the stability is improved.

[0043] The horizontal pipe 21 can be a pipe with a D-shaped cross section, so as to form a structure with an upper side arc and a lower side flat.

[0044] As shown in Figure 7 , the support 32 is in the shape of a shell, and the side away from the horizontal pipe 21 is open, so as to facilitate the processing and preparation of the support 32, reduce the material, and reduce the cost. The support 32 is provided with reinforcing ribs 322, and the reinforcing ribs 322 are arranged in the transverse direction. Each reinforcing rib 322 extends in the vertical direction, so as to improve the structural strength.

[0045] As shown in Figure 5 , Figure 6 , the fixing member 31 is in the shape of a plate, and the upper surface thereof is in abutment with and fixedly connected to the lower surface of the table top panel 1, so as to facilitate the assembly and connection between the fixing member 31 and the table top panel 1, and make the connection firm and reliable.

[0046] The fixing member 31 is provided with an arc-shaped slot 314, the top of the support 32 is provided with a hinge block 323, and the hinge block 323 is integrally formed with a rotating shaft 324. The rotating shaft 324 is rotatably arranged in the arc-shaped slot 314. By matching the arc-shaped slot 314 and the rotating shaft 324, the support 32 and the fixing member 31 can be rotatably matched.

[0047] In this embodiment, two rotating shafts 324 are arranged on the hinge block 323, and the two rotating shafts 324 are respectively arranged in two oppositely arranged arc-shaped slots 314.

[0048] The fixing member 31 is provided with a through hole at a position corresponding to the arc-shaped slot 314 and the hinge block 323. The through hole penetrates the upper surface of the fixing member 31. The through hole can facilitate the rotating shaft 324 to be arranged in the arc-shaped slot 314, and facilitate the assembly and connection between the fixing member 31 and the support 32.

[0049] In this embodiment, there are two hinge blocks 323, and each hinge block 323 is provided with two rotating shafts 324. Correspondingly, there are four arc-shaped slots 314.

[0050] The hinge block 323 is located on the support 32 near one side of the horizontal pipe 21, a blind hole 325 is arranged on the top of the support 32 away from the side of the horizontal pipe 21, the lower surface of the fixing member 31 is provided with a limiting protruding column 313, and the elastic member 33 is a compression spring, one end of which is arranged in the blind hole 325 and the other end is sleeved outside the limiting protruding column 313. By using the cooperation of the compression spring, the blind hole 325 and the limiting protruding column 313, convenient assembly can be achieved. Here, in other embodiments, the elastic member 33 can also be a torsion spring arranged at the hinge between the fixing member 31 and the support 32.

[0051] The support 32 is located between the book holder 4 and the horizontal pipe 21, so that the front and rear rotation and the up and down movement of the support 32 are located between the book holder 4 and the horizontal pipe 21, avoiding the movement of the support 32 being disturbed by other external objects. When unlocking, the user can push the support 32 forward, which is convenient to operate. Of course, in other embodiments, the support 32 can also be arranged on the side of the horizontal pipe 21 away from the book holder 4, and the user can pull the support 32 backward to unlock.

[0052] As shown in Figure 8 The top of the book holder 4 is provided with two insertion holes 40 on the left and right sides, and the two upper pipes 22 are respectively inserted into the two insertion holes 40 to install the book holder 4 on the desk pipe frame 2. The book holder 4 is provided with a storage space for students to store books and various student supplies. The book holder 4 is located at the front side of the horizontal pipe 21.

[0053] The book holder 4 is provided with two rotating shaft holes 41, which are respectively located on the left and right sides of the top of the book holder 4. The left and right sides of the desktop panel 1 are respectively rotationally connected to the two rotating shaft holes 41, so that the desktop panel 1 can rotate around the rotating shaft holes 41, thereby realizing the rotation of the desktop panel 1 between the horizontal state and the inclined state.

[0054] As shown in Figure 1 The lower surface of the desktop panel 1 is provided with an anti-swing member 5, as shown in Figure 9 The anti-swing member 5 is provided with a positioning column 51 and a stabilizing plate 52, the positioning column 51 is rotationally connected to the rotating shaft hole 41, and the stabilizing plate 52 is located at the end of the positioning column 51 away from the rotating shaft hole 41. The stabilizing plate 52 is vertically arranged and is in close contact with the inner wall of the book holder 4, so as to prevent the desktop panel 1 from shaking during rotation, thereby facilitating the abutting cooperation between the positioning protrusion 321 and the horizontal pipe 21.

[0055] The anti-swing member 5 is plate-shaped, and its upper surface is fixedly connected with the lower surface of the desktop panel 1 to facilitate the assembly and connection therebetween. The positioning column 51 and the stabilizing plate 52 are arranged on the lower surface of the anti-swing member 5 to facilitate cooperation with the book holder. The positioning column 51 and the stabilizing plate 52 are integrally formed on the anti-swing member 5 to improve the structural strength.

[0056] As shown in Figure 8As shown, the book holder 4 is provided with a hinged seat 45, the hinged seat 45 is provided with a positioning groove 451, the top surface of the positioning groove 451 and the surface adjacent to the inner side of the book holder 4 are open, the rotating shaft hole 41 is arranged on the hinged seat 45, and one end of the rotating shaft hole 41 is communicated to the positioning groove 451. The positioning column 51 is arranged in the positioning groove 451, the rotating screw 46 is arranged in the rotating shaft hole 41, the rotating screw 46 is threadedly connected with the positioning column 51, the rotating screw 46 can be used as the rotating shaft of the desktop panel 1, and the assembly and connection between the hinged seat 45 and the anti-swing piece 5 are facilitated.

[0057] The positioning groove 451 forms a step at the inner side of the book holder 4, and the positioning column 51 and the stabilizing plate 52 form a step at the connection position, so that the rotation stability is further ensured, and the desktop panel 1 is prevented from shaking.

[0058] The hinged seat 45 is two, which are arranged at the top of the two book holders 4 respectively, and the two rotating shaft holes 41 are arranged in the two hinged seats 45 respectively. The anti-swing piece 5 is two, which are correspondingly matched with the two rotating shaft holes 41 respectively, so that the rotation stability of the desktop panel 1 is further ensured.

[0059] The upper pipe 22 comprises a longitudinal portion and an inclined portion, the longitudinal portion extends in the front-rear direction and is arranged in the insertion hole 40 of the book holder 4, the rear end of the longitudinal portion is connected with the front end of the inclined portion, and the inclined portion extends to the rear lower side in an inclined manner, so that the inclined portion abuts against the desktop panel 1 when the desktop panel 1 is in the inclined state, the inclined angle of the desktop panel 1 is positioned, and the use is facilitated.

[0060] In the embodiment, the support piece 32 is moved close to the horizontal pipe 21 by the elastic force of the elastic piece 33, so that the support piece 32 is moved towards the horizontal pipe 21. Here, in other embodiments, the elastic piece 33 can not be arranged, and the support piece 32 is arranged at an inclined angle, and the support piece 32 is rotated towards the horizontal pipe 21 by the self-gravity of the support piece 32.

[0061] In conclusion, although the preferred embodiment of the utility model has been disclosed as above, the above-mentioned preferred embodiment is not used to limit the utility model, and the ordinary skilled in the art can make various changes and decorations without departing from the spirit and scope of the utility model, so the protection scope of the utility model is subject to the range defined by the claims.

Claims

1. A desk top tilting locking structure for locking the rotating position between a desk top panel and a desk pipe frame in a noon break desk, characterized in that, The table frame includes a horizontal tube, and the tabletop tilting and locking structure includes a fixing member and a support member. The fixing member is disposed on the tabletop and moves up and down as the tabletop rotates. The support member has a positioning protrusion on the side facing the horizontal tube, and the top of the support member is hinged to the fixing member so that the positioning protrusion moves closer to or further away from the horizontal tube in the front-back direction. When the desktop is in a horizontal position, the lower side of the positioning protrusion abuts against the upper side of the horizontal tube to restrict the rear end of the desktop from rotating downward. When the desktop panel is rotated to the tilted position, the upper side of the positioning protrusion abuts against the lower side of the horizontal tube to restrict the rear end of the desktop panel from rotating upward.

2. The desk tilt lock arrangement of claim 1, wherein, The desktop tilting locking structure also includes an elastic element, which is disposed between the fixing element and the support element, and is used to provide elastic force so that the support element rotates toward the horizontal tube and abuts against the horizontal tube.

3. The desk tilt lock arrangement of claim 1, wherein, The positioning protrusion is a strip-shaped part arranged in the horizontal direction; the upper surface of the positioning protrusion and the lower surface of the horizontal tube are both planar, and they fit together in the tilted state; the upper surface of the horizontal tube is convex arc-shaped, and the connection between the lower side of the positioning protrusion and the support member is a concave arc-shaped part that matches the convex arc-shaped part.

4. The desk tilt lock arrangement of claim 2, wherein, The fastener is plate-shaped, with its upper surface attached to and fixedly connected to the lower surface of the desktop board. The fastener is provided with an arc-shaped groove, and the top of the support is provided with a hinge block. A rotating shaft is integrally formed on the hinge block, and the rotating shaft is rotatably disposed in the arc-shaped groove. A through hole is provided on the fastener at the position corresponding to the arc-shaped groove and the hinge block, and the through hole extends to the upper surface of the fastener.

5. The table top tilt lock structure according to claim 4, wherein The hinge block is located on the side of the support member close to the horizontal tube. A blind hole is provided on the top of the support member away from the horizontal tube. A limiting protrusion is provided on the lower surface of the fixing member. The elastic member is a compression spring, one end of which is located in the blind hole and the other end is sleeved on the limiting protrusion.

6. The table top tilt lock arrangement according to any one of claims 1-5, characterized in that, The table frame is equipped with a book drawer, and the support member is located between the book drawer and the horizontal tube.

7. The table top tilt lock arrangement according to any one of claims 1-5, wherein, The support member is shell-shaped, with the side facing away from the horizontal tube being open; the support member is provided with reinforcing ribs, which are multiple ribs arranged horizontally and each reinforcing rib extends vertically.

8. A lunch desk, characterized in that The invention includes a desktop panel, a table frame, a book drawer, and a desktop tilting and locking structure as described in any one of claims 1-7, wherein the book drawer and the desktop panel are both mounted on the table frame, and the desktop tilting and locking structure is connected between the desktop panel and the table frame.

9. The lunch table according to claim 8, characterized in that The book drawer is provided with a rotating shaft hole, and the lower surface of the desktop is provided with an anti-sway component. The anti-sway component is provided with a positioning post and a stabilizing plate. The positioning post is rotatably connected to the rotating shaft hole, and the stabilizing plate is located at the end of the positioning post away from the rotating shaft hole. The stabilizing plate is vertically arranged and fits against the inner wall of the book drawer.

10. The lunch table according to claim 9, characterized in that The book bucket is provided with a hinged seat, the hinged seat is provided with a positioning slot, the top surface of the positioning slot and the surface adjacent to the inner side of the book bucket are open, the rotating shaft hole is arranged on the hinged seat and is communicated to the positioning slot at one end, the positioning column is arranged in the positioning slot, the rotating screw is arranged in the rotating shaft hole, and the rotating screw is threadedly connected with the positioning column.

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