Steam mop

Abstract

The steam mop comprises a base, a rod body, a lower connecting pipe and an upper connecting pipe. The rod body is provided with a steam generator, and the base is provided with a first steam connector and a hinge seat. And the inner sides of the lower connecting pipe and the upper connecting pipe jointly form a steam channel. The lower connecting pipe is rotatably installed on the hinge seat of the base through a first hinge shaft on the outer side of the lower connecting pipe, and the rod body is installed on the upper connecting pipe so that the steam generator can be communicated with the first steam connector of the base through the steam channel. In order to achieve vertical storage and positioning, a first positioning piece is installed on the base, and a second positioning piece is rotatably installed in the lower connecting pipe through a third hinge shaft. When the lower connecting pipe rotates to a vertical position, the first positioning piece is matched with the first hinge shaft to lock the lower connecting pipe; meanwhile, the lower end of the second positioning piece abuts against the hinge seat to force the hinge seat to rotate around the shaft, and the upper end of the second positioning piece extends into the outer side wall of the upper connecting pipe to lock the upper connecting pipe. The invention aims to provide the steam mop capable of standing upright without influencing steam conveying.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cleaning mops, in particular to a steam mop. BACKGROUND

[0002] With the upgrading of cleaning needs, steam mops have been widely used in various scenes such as homes and office places due to their cleaning and sterilization functions and convenient operation. As the core connecting component of the steam mop, the performance of the universal joint directly affects the flexibility of the mopping operation. The universal joint of the existing steam mop is generally designed to realize multi-directional rotation in front and back, left and right, so as to meet the flexible operation needs of users in the cleaning process, such as avoiding obstacles, fitting into dead corners (such as corners and furniture bottoms), and solving the problem of "heavy turning and incomplete cleaning" of traditional fixed connection structure when mopping.

[0003] The universal joint of the existing steam mop generally has two design features: first, a multi-directional rotation structure is adopted, which realizes flexible swinging in front and back, left and right through hinging or spherical hinge, so as to meet the operation needs of users in the cleaning process, such as avoiding furniture, fitting into corners and furniture bottoms, and solving the problem of "heavy turning and many blind areas" of traditional fixed connection structure; second, a steam channel is built-in, which is matched with the rotating structure of the universal joint, so as to ensure that the steam is not leaked and smoothly delivered during dynamic mopping.

[0004] In actual use, the steam mop needs to consider both "dynamic mopping" and "static parking / storage" scenarios: on the one hand, the universal joint needs to remain flexible during dynamic mopping to ensure smooth operation; on the other hand, when pausing during mopping, such as taking cleaning agent, arranging cables, refilling the water tank or storing after use, the steam mop needs to be stably upright to prevent the product from being tilted, which not only prevents the mop rod, steam nozzle and other components from being damaged by collision with the ground, but also saves storage space and keeps the environment clean. Therefore, a universal joint structure that can quickly switch between flexible activity state and stable upright state is needed, so that the mop rod of the mop is upright relative to the base, and during the switching process, the structural integrity of the steam channel needs to be ensured, and the steam channel should not be squeezed or blocked by the locking mechanism to avoid problems such as steam leakage and blocked delivery. SUMMARY

[0005] The present application aims to solve the above technical problems and provide a steam mop that can be upright without affecting steam delivery.

[0006] The steam mop comprises a base, a rod body, a lower connecting pipe, an upper connecting pipe, a first positioning member and a second positioning member. The rod body is provided with a steam generator. The base is provided with a first steam interface and a hinged seat. The lower connecting pipe and the upper connecting pipe are hinged to each other, and the inner sides of the lower connecting pipe and the upper connecting pipe are formed with a steam passage. The lower connecting pipe is provided with a first hinged shaft on the outer side thereof, which is rotatably installed on the hinged seat. The rod body is installed on the upper connecting pipe, so that the steam generator is connected to the first steam interface through the steam passage. The first positioning member is installed on the side of the base of the hinged seat. The second positioning member is rotatably installed in the lower connecting pipe on the outer side of the upper connecting pipe through a third hinged shaft. The lower end of the second positioning member extends out of the lower connecting pipe on the side of the steam passage. When the lower connecting pipe is rotated to a vertical position around the first hinged shaft, the first positioning member is positioned in cooperation with the first hinged shaft, and the lower end of the second positioning member abuts against the hinged seat, so that the second positioning member is rotated around the third hinged shaft, and the upper end of the second positioning member extends into the outer side wall of the upper connecting pipe to position the upper connecting pipe in the vertical position.

[0007] The steam mop according to the present application has a double-layer hinged structure of the lower connecting pipe and the base and the upper connecting pipe and the lower connecting pipe, which realizes flexible rotation of the rod body relative to the base in front, back, left and right directions to meet the operation requirements of avoiding obstacles and fitting the dead angle of the ground during mopping, and realizes quick switching between flexible movement and stable verticality through the linkage positioning design of the first positioning member and the second positioning member. When the lower connecting pipe is rotated to a vertical position, the first positioning member is locked with the first hinged shaft to position the lower connecting pipe, and the lower end of the second positioning member abuts against the hinged seat to trigger rotation, and the upper end of the second positioning member extends into the upper connecting pipe to complete positioning of the upper connecting pipe. The stable verticality of the rod body relative to the base is realized without additional manual operation, and the problem that the universal joint of the traditional steam mop is too flexible to be vertically positioned automatically is solved. In addition, the steam passage formed in the inner sides of the lower connecting pipe and the upper connecting pipe ensures stable connection between the steam generator and the first steam interface. The positioning structure and the steam passage are independently arranged to avoid interference of the positioning action on steam delivery, realize compatibility of the three core functions of flexible operation, stable verticality and smooth steam delivery, and improve the use convenience and practicality of the steam mop.

[0008] Further, the steam passage comprises a second steam interface arranged on the inner side of the upper connecting pipe and a hose. The rod body is inserted and installed in the upper connecting pipe, so that the steam generator is inserted and connected to the upper end of the second steam interface. The hose is connected to the lower end of the second steam interface. The hose passes through the lower connecting pipe and the hinged seat in sequence and is connected to the first steam interface.

[0009] Further, the axis of the third hinge shaft is parallel to or coincides with the axis of the first hinge shaft; when the second positioning member rotates its upper end extending outside the upper connector pipe around the third hinge shaft, its rotation path is spatially staggered with the part of the hose. This structure ensures that when the lower connector pipe rotates around the first hinge shaft to the upright position, the second positioning member can rotate smoothly in the appropriate direction, avoiding jamming and interference, and improving the smoothness and reliability of the positioning action; at the same time, the rotation path of the second positioning member is spatially staggered with the hose, completely eliminating the squeezing, pulling or scratching of the hose during the rotation of the positioning member from the structural layout, which not only protects the hose and prolongs its service life, but also avoids problems such as steam leakage and blocked delivery caused by damage to the hose.

[0010] Further, the two sides of the hinge seat are provided with hinge holes, the first positioning member is integrally installed above the hinge holes, and the first positioning member extends into the hinge holes with a first positioning protruding strip, the side wall of the first hinge shaft is provided with a second positioning protruding strip and a first movable slot, the second positioning protruding strip is arranged on one side of the first movable slot, the first positioning protruding strip and the second positioning protruding strip cooperate to be positioned in the upright position, and the first positioning protruding strip can move in the first movable slot. On the one hand, the cooperation of the first positioning protruding strip and the second positioning protruding strip can accurately limit the rotation of the lower connector pipe in the upright position, ensuring the stability of the upright state; on the other hand, the first positioning protruding strip can freely move in the first movable slot, without affecting the flexibility of the rotation of the lower connector pipe in the front, back, left and right directions during mopping.

[0011] Further, the second positioning protruding strip only provides one side limit for the first positioning protruding strip, and the other side is limited by the abutting of the lower connector pipe and the hinge seat. The design of using the second positioning protruding strip to only provide one side limit for the first positioning protruding strip and the other side limit by the abutting of the lower connector pipe and the hinge seat simplifies the part design and assembly process of the positioning structure, and reduces the risk of jamming that may be caused by the double-sided cooperation of the protruding strips; at the same time, the abutting limit method can disperse the positioning stress, avoid the wear or deformation caused by the long-term stress of a single protruding strip, and improve the reliability and durability of the upright positioning.

[0012] Further, the second positioning member includes a hinge part, a contact part and a limiting part, the third hinge shaft is arranged on the hinge part, the hinge part is arranged in the middle of the second positioning member, the contact part is arranged at the lower end of the hinge part, and the contact part extends downwardly from the lower connector pipe, and the limiting part is arranged at the upper end of the hinge part.

[0013] Further, it further includes an elastic member, one side of the elastic member abuts against the inner side wall of the lower connector pipe, the other side abuts against the second positioning member, and is compressed when the lower end of the second positioning member abuts against the base and rotates. When the upright state is released, the elastic member can assist the second positioning member to quickly reset through the rebound force, without the need for manual operation to restore the flexible activity state.

[0014] Further, the base is provided with an abutting surface abutting against the abutting part, and the base is further provided with a second movable slot connected with the abutting surface, and the abutting part is movable in the second movable slot, and the abutting part comprises two spaced apart abutting rods, and the base is provided with two spaced apart second movable slots at corresponding positions, and the abutting rods are movable in the corresponding second movable slots respectively, and the steam passage passes through between the two abutting rods and the two movable slots. The two spaced apart abutting rods can balance the force of the abutting part of the second positioning member, avoid the tilting or rotating jam of the second positioning member caused by unilateral abutting, and ensure the smooth triggering of the positioning action.

[0015] Further, the hinge part further comprises a hinge extension arm, the hinge extension arm extends outward from the middle part of the second positioning member, and the third hinge shaft is arranged at the end of the hinge extension arm. The combination of the hinge extension arm and the third hinge shaft extends the hinge lever of the second positioning member, so that the driving force generated when the abutting part abuts against the base can be more efficiently transmitted to the limiting part, the triggering force of the positioning action is reduced, and the user operation feeling is improved. At the same time, the design of the extension arm can optimize the installation space layout of the second positioning member in the lower connecting pipe, avoid interference with other components, and ensure the smooth coordination of the actions of various parts.

[0016] Further, the outer side wall of the upper connecting pipe is provided with a second hinge shaft, the second hinge shaft is hingedly installed on the lower connecting pipe, a positioning slot is arranged above the second hinge shaft, a positioning protrusion is arranged on the limiting part and extends into the positioning slot for positioning, a through hole is arranged below the positioning protrusion, the second hinge shaft passes through the through hole, and the lower connecting pipe is hingedly installed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the mop of the present application.

[0018] Figure 2 It is an explosion view of the steam mop of the present application.

[0019] Figure 3 It is a perspective view of the base of the present application.

[0020] Figure 4 It is a sectional view of the steam mop of the present application.

[0021] Figure 5 It is a sectional view of the steam mop of the present application. Figure 4

[0022] Figure 6 It is another sectional view of the steam mop of the present application.

[0023] Figure 7 It is another sectional view of the steam mop of the present application. Figure 6 ​A magnified view of a portion of the image.

[0024] Figure 8 This is another cross-sectional view of the steam mop of the present invention.

[0025] Figure 9 for Figure 8 A magnified view of a portion of the image. Detailed Implementation

[0026] A steam mop of the present invention is described in conjunction with the accompanying drawings.

[0027] like Figures 1 to 9 The steam mop shown includes a base 1, a rod 2, a lower connecting pipe 3, an upper connecting pipe 4, a first positioning element 6, and a second positioning element 7. The mop cloth 5 is installed below the base 1. The user holds the rod 2 to operate the mop cloth 5 on the base 1 to perform mopping work. A steam generator is provided on the rod 2, which generates steam and delivers it to the mop cloth 5 on the base 1, thereby performing steam mopping. The steam generator is a common device in the art and will not be described in detail here. One end of the lower connecting pipe 3 is hinged to the base 1, and one end of the upper connecting pipe 4 is hinged to the other end of the lower connecting pipe 3. The rod 2 is installed at the other end of the upper connecting pipe 4. The rod body is positioned by the hinged connection between the lower connecting pipe 3 and the base 1, and the hinged connection between the upper connecting pipe 4 and the lower connecting pipe 3. 2. The mop can rotate flexibly in all directions relative to the base 1, which meets the flexible operation requirements of avoiding obstacles and fitting into dead corners of the ground during mopping. The first positioning component 6 is installed on the base 1, and the second positioning component 7 is hinged in the lower tube 3. The first positioning component 6 and the lower tube 3 cooperate to position it in an upright position, and the lower end of the second positioning component 7 abuts against the base 1 and rotates, so that the upper end of the second positioning component 7 extends into the upper tube 4 to position the upper tube 4 in an upright position. With the cooperation of the first positioning component 6 and the lower tube 3, and the linkage of the second positioning component 7 with the base 1 and the upper tube 4, the lower tube 3 and the upper tube 4 can be quickly positioned in an upright position simultaneously, so that the mop can be stably and uprightly parked without relying on external support.

[0028] like Figures 2 to 5 As shown, the base 1 is provided with a hinge seat 11, and the hinge seat 11 is provided with hinge holes 112 on both sides. The first positioning member 6 is installed above the hinge holes 112, and the first positioning member 6 extends into the hinge holes 112 with a first positioning protrusion 61. The lower pipe 3 is provided with a first hinge shaft 31, and the side wall of the first hinge shaft 31 is provided with a second positioning protrusion 311 and a first movable groove 312. The second positioning protrusion 311 is located on one side of the first movable groove 312. The first positioning protrusion 61 and the second positioning protrusion 311 cooperate to be positioned in an upright position. The first positioning protrusion 61 can move in the first movable groove 312.

[0029] likeFigure 5 As shown, the base 1 has a cavity for placing the first positioning member 6 above the hinge hole 112, and a protruding retaining strip 115 is formed in the cavity. The retaining strip 115 is interference-fitted with the first positioning member 6, so that the first positioning member 6 can be stably engaged above the hinge hole 112. The first positioning member 6 is formed by bending a sheet material, so that the first positioning member 6 can easily form a first positioning protrusion 61, and the first positioning protrusion 61 can have a certain elasticity, so that the first positioning member 6 and the first hinge shaft 31 can be easily positioned and released.

[0030] like Figure 3 , Figure 5 and Figure 6 The second positioning protrusion 311 only provides a limit on one side of the first positioning protrusion 61, while the other side serves as a limit for the lower tube 3 to abut against the hinge seat 11. Figure 3 As shown, the hinge seat 11 is provided with a limiting edge 111. When the lower pipe 3 is upright, the limiting edge 111 abuts against the outer shell of the lower pipe 3 to form a limiting edge on the other side. Figure 5 As shown, there is only one second positioning protrusion 311. When the first positioning protrusion 61 slides from the first movable groove 312 to the rear of the second positioning protrusion 311, the outer shell of the lower pipe 3 just abuts against the limiting edge 111, thereby making the lower pipe 3 completely positioned.

[0031] like Figure 3 The base 1 also has a first steam port 12 in front of the hinge seat 11. The first steam port 12 and the hinge seat 11 are connected by a limiting edge 111. The lower side of the limiting edge 111 is open to facilitate the connection of the first steam port 12 with the lower pipe 3 and the upper pipe 4 inside the hinge seat 11.

[0032] like Figure 8 and Figure 9 As shown, the rod 2 is inserted into the upper pipe 4, allowing the steam generator to connect to the first steam interface 12 via a steam channel. The steam channel includes a second steam interface 43 located inside the upper pipe 4 and a flexible hose. Simultaneously, the rod 2 is inserted into the upper pipe 4, allowing the steam generator's outlet pipe 21 to connect to the upper end of the second steam interface 43. Two sealing rings are provided on the side of the outlet pipe 21, ensuring a seal between the outlet pipe 21 and the second steam interface 43. The flexible hose connects to the lower end of the second steam interface 43, passing sequentially through the lower pipe 3 and the hinge seat 11 to connect to the first steam interface 12. The lower side of the limiting edge 111 of the hinge seat 11 is open, and the flexible hose passes through this open portion to connect to the first steam interface 12. Figure 2As shown, the lower part of the lower connector pipe 3 is provided with a first arc-shaped through hole 32, through which the hose is connected with the first steam interface 12, and the first arc-shaped through hole 32 is arranged to allow the hose to move in the first arc-shaped through hole 32 when the steam mop is in use, so as to avoid the hose from hindering the movement of the lower connector pipe 3 and the upper connector pipe 4.

[0033] As shown in Figure 2 , the second positioning member 7 comprises a hinged part, a contact part and a limiting part, the hinged part is arranged at the middle part of the second positioning member 7, the contact part is arranged at the lower end of the hinged part and extends downwardly to the lower connector pipe 3, and the limiting part is arranged at the upper end of the hinged part.

[0034] As shown in Figure 8 and Figure 9 , the second positioning member 7 further comprises a resilient member 76, which is a spring, one side of the resilient member 76 is pressed against the inner side wall of the lower connector pipe 3, the other side is pressed against the second positioning member 7, and the resilient member 76 is compressed when the second positioning member 7 is pressed against the base 1 at the lower end and rotated, and the resilient force of the resilient member 76 can assist the second positioning member 7 to quickly reset when the upright state is released, so that the flexible movement state can be restored without manual operation.

[0035] As shown in Figure 3 , Figure 6 and Figure 7 , the base 1 is provided with a contact surface 113 which is in contact with the contact part, and the contact surface 113 is the bottom surface of the hinged seat 11, and the base 1 is further provided with a second movable slot 114 which is connected with the contact surface 113, and the contact part can move in the second movable slot 114.

[0036] As shown in Figure 2 , Figure 6 and Figure 7 , the contact part comprises two contact rods 73 which are arranged at intervals, and the base 1 is provided with two second movable slots 114 which are arranged at intervals at the corresponding positions, and the contact rods 73 move in the corresponding second movable slots 114 respectively, and the two contact rods 73 arranged at intervals can balance the force acting on the contact part of the second positioning member 7, avoid the second positioning member 7 from tilting or rotating and being stuck due to unilateral contact, and ensure the smooth triggering of the positioning action.

[0037] As shown in Figure 2As shown, the axis of the third hinge shaft 72 is parallel to or coincides with the axis of the first hinge shaft 31, preferably as in the embodiment shown in the drawings of the present application, the axis of the third hinge shaft 72 coincides with the axis of the first hinge shaft 31, the hinge part comprises a hinge extension arm 71 extending outward from the middle of the second positioning member 7 and a third hinge shaft 72 arranged at the end of the hinge extension arm 71, an axle hole 313 is arranged on the first hinge shaft 31 of the lower connector pipe 3 for mounting the third hinge shaft 72, the third hinge shaft 72 can be extended to the opposite side of the axle hole 313 through the extension arm 71, the combination of the hinge extension arm 71 and the third hinge shaft 72 extends the hinge lever of the second positioning member 7, so that the driving force generated when the abutting part abuts against the base 1 can be more efficiently transmitted to the limiting part, reducing the triggering force of the positioning action and improving the user's operation feel; at the same time, the design of the extension arm 71 can optimize the installation space layout of the second positioning member 7 in the lower connector pipe 3, the space required for the movement track of the second positioning member 7 is smaller, avoiding interference with other components, ensuring smooth coordination of the movement of each part.

[0038] When the second positioning member 7 rotates its upper end to extend outside the outer wall of the upper connector pipe 4 around the third hinge shaft 72, its rotation path is spatially staggered with the part of the hose, as shown in Figure 2 As shown, the hinge extension arm 71 and the third hinge shaft 72 are provided with two groups and are respectively hingedly installed on the first hinge shaft 31, the space for the hose to move is formed between the two groups of hinge extension arms 71 and third hinge shafts 72, the lower connector pipe 3 is provided with a second arc-shaped through hole 33 on both sides of the first arc-shaped through hole 32, the second arc-shaped through hole 33 is provided with two spaced apart abutting rods 73 extending out of the lower connector pipe 3, through the above structure, the rotation path of the second positioning member 7 is spatially staggered with the part of the hose.

[0039] As shown in Figure 2 , Figure 8 and Figure 9 As shown, the upper connector pipe 4 is provided with a second hinge shaft 41, and a positioning groove 42 is arranged above the second hinge shaft 41, the limiting part is provided with a positioning protrusion 74 extending into the positioning groove 42 for positioning, the lower side of the positioning protrusion 74 is provided with a through hole 75, the second hinge shaft 41 passes through the through hole 75 and is hingedly installed with the lower connector pipe 3.

[0040] Those skilled in the art can make various modifications and changes to the above embodiments according to the disclosure and teachings herein. Therefore, the application is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the application shall fall within the protection scope of the claims of the application. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the application.

Claims

1. A steam mop, characterized in that, The steam generator comprises a base, a rod body, a lower connecting pipe, an upper connecting pipe, a first positioning member and a second positioning member. The rod body is provided with a steam generator. The base is provided with a first steam interface and a hinged seat. The lower connecting pipe and the upper connecting pipe are hingedly connected to each other, and the inner sides of the lower connecting pipe and the upper connecting pipe are formed with a steam passage. The lower connecting pipe is provided on the outer side thereof with a first hinged shaft which is rotatably mounted on the hinged seat. The rod body is mounted on the upper connecting pipe, so that the steam generator is connected to the first steam interface through the steam passage. The first positioning member is mounted on the side of the hinged seat. The second positioning member is rotatably mounted on the inner side of the lower connecting pipe outside the upper connecting pipe through a third hinged shaft. The lower end of the second positioning member extends out of the lower connecting pipe on the side of the steam passage. When the lower connecting pipe is rotated to a vertical position around the first hinged shaft, the first positioning member is positioned in cooperation with the first hinged shaft, and the lower end of the second positioning member abuts against the hinged seat, so that the second positioning member is rotated around the third hinged shaft, and the upper end of the second positioning member extends into the outer side wall of the upper connecting pipe to position the upper connecting pipe in the vertical position.

2. The steam mop of claim 1, wherein, The steam passage comprises a second steam interface arranged on the inner side of the upper connecting pipe and a hose. The rod body is inserted into the upper connecting pipe, and the steam generator is inserted into the upper end of the second steam interface. The lower end of the second steam interface is connected to the hose. The hose is sequentially connected to the first steam interface through the lower connecting pipe and the hinged seat.

3. The steam mop of claim 2, wherein, The axis of the third hinged shaft is parallel to or coincides with the axis of the first hinged shaft. When the upper end of the second positioning member extends into the outer side wall of the upper connecting pipe around the third hinged shaft, the rotating path of the upper end of the second positioning member is spatially staggered with the part of the hose.

4. The steam mop of claim 1, wherein, The hinged seat is provided with hinged holes on both sides. The first positioning member is integrally mounted above the hinged holes, and the first positioning member extends into the hinged holes with first positioning protrusions. The side wall of the first hinged shaft is provided with second positioning protrusions and a first movable slot. The second positioning protrusions are arranged on one side of the first movable slot. The first positioning protrusions and the second positioning protrusions cooperate to position the first hinged shaft in the vertical position. The first positioning protrusions are movable in the first movable slot.

5. The steam mop of claim 4, wherein, The second positioning protrusions only provide one side limit for the first positioning protrusions, and the other side limit is provided by the abutment of the lower connecting pipe and the hinged seat.

6. The steam mop of claim 1, wherein, The second positioning member comprises a hinged part, an abutting part and a limiting part. The third hinged shaft is arranged on the hinged part. The hinged part is arranged in the middle of the second positioning member. The abutting part is arranged at the lower end of the hinged part, and the abutting part extends downwardly out of the lower connecting pipe. The limiting part is arranged at the upper end of the hinged part.

7. The steam mop of claim 6, wherein, The second positioning member further comprises a resilient member. One side of the resilient member abuts against the inner side wall of the lower connecting pipe, and the other side of the resilient member abuts against the second positioning member. The resilient member is compressed when the lower end of the second positioning member abuts against the hinged seat.

8. The steam mop of claim 6, wherein, The base is provided with a contact surface in contact with the contact part, and is further provided with a second movable slot connected with the contact surface, the contact part comprises two spaced contact rods, the base is provided with two spaced second movable slots at corresponding positions, the contact rods are movably arranged in the corresponding second movable slots, and the steam passage passes through between the two contact rods and the two movable slots.

9. The steam mop of claim 6, wherein, The hinged part further comprises a hinged extension arm which extends outwardly from the middle of the second positioning member, and the third hinged shaft is arranged at the end of the hinged extension arm.

10. The steam mop of claim 6, wherein, The outer side wall of the upper connecting pipe is provided with a second hinged shaft which is hingedly arranged on the lower connecting pipe, the upper side of the second hinged shaft is provided with a positioning slot, the limiting part is provided with a positioning protrusion which extends into the positioning slot to cooperate with positioning, the lower side of the positioning protrusion is provided with a through hole, the second hinged shaft passes through the through hole, and is further hingedly arranged on the lower connecting pipe.

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