CN110565628B

CN110565628B - Double-liquid grouting equipment for geotechnical engineering foundation reinforcement

Info

Publication number: CN110565628B
Application number: CN201910875835.4A
Authority: CN
Inventors: 张春刚; 李瑞鑫; 杨春; 王贵和; 黄峰
Original assignee: China Mineral Resources Group Co Ltd; China University of Geosciences Beijing
Current assignee: China Mineral Resources Group Co Ltd; China University of Geosciences Beijing
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-16
Anticipated expiration: 2039-09-17
Also published as: CN110565628A

Abstract

The invention discloses double-liquid grouting equipment for geotechnical engineering foundation reinforcement, which comprises a shell, wherein two groups of symmetrically arranged rotating bottom plates are rotatably connected and arranged in the shell through a material guide pipeline, accommodating cavities for accommodating cement slurry and water glass are fixedly arranged on the rotating bottom plates, a material pumping structure which is communicated with the accommodating cavities through the material guide pipeline and pumps materials intermittently is also fixedly arranged in the shell, the material pumping structure and the material guide pipeline are synchronously driven through a transmission structure, and a movable upper cover structure for plugging the accommodating cavities is movably assembled at the upper end of the shell. According to the invention, double-pipe grouting can be formed, and according to the optimal grouting ratio summarized by actual construction, the grouting mode can ensure that the cement paste and the water glass in the two groups of accommodating cavities are in a ratio of 1: 1 grouting, thereby ensuring the construction quality, improving the construction accuracy and being more scientific and accurate compared with the traditional grouting amount control mode.

Description

Double-liquid grouting equipment for geotechnical engineering foundation reinforcement

Technical Field

The invention relates to the technical field of engineering construction, in particular to double-liquid grouting equipment for geotechnical engineering foundation reinforcement.

Background

The foundation pit stratum grouting reinforcement is to increase the strength, rigidity and impermeability of a soil body by means of grouting so as to meet the requirements of foundation pit engineering.

In the prior art, cement and water glass can be respectively injected in proportion by adopting grouting equipment during grouting, and the grouting equipment can act on a foundation pit and obtain a reinforcing effect. In the prior art, in order to achieve the purpose that the injection proportion of cement and water glass is fixed during injection, quantitative and constant-speed operation is needed, and the traditional casing is inconvenient to use, so that the actual operation effect and the theoretical effect are difficult to achieve the consistency.

Disclosure of Invention

The invention aims to provide double-liquid grouting equipment for geotechnical engineering foundation reinforcement, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a biliquid slip casting equipment for geotechnical engineering ground is consolidated, includes the shell, rotate through the guide pipe in the shell and connect the rotation bottom plate that is provided with two sets of symmetry settings, the fixed holding chamber that is used for holding cement thick liquids and sodium silicate that is provided with on the rotation bottom plate, still the fixed material structure of taking out of material is taken out through passage way intercommunication and intermittent type with the holding chamber in the shell, take out material structure and guide pipe and all through transmission structure synchronous drive, through taking out material structure intermittent type nature when passage way rotates and take out material suction through the guide pipe and take out material structure and discharge, the still activity assembly of shell upper end is provided with the activity upper cover structure that is used for shutoff holding chamber.

Furthermore, the accommodating cavity is fixedly connected with the rotating bottom plate, and the lower end of the accommodating cavity is communicated with the material guide pipeline.

Further, take out the material structure including fixing two sets of material chambeies of taking out in the shell, the end in two sets of material chambeies of taking out all runs through and is provided with the material pipe of taking out, it keeps away from material pipe one side rotation connection and is provided with the knee-lever to take out the material chamber, the knee-lever is "nearly" font structure, and one end runs through the material chamber of taking out and connects and be provided with the drive shaft that runs through the shell setting, the drive shaft passes through transmission structure and the synchronous rotation of passage way, the peripheral middle part of knee-lever rotates to cup joint and is provided with and rotates the cover, it is provided with the piston to rotate the cover side through the connecting rod connection, piston side and connecting rod rotate the connection through articulated mode.

Furthermore, a one-way valve communicated with the inside of the pumping pipe from outside is arranged in the pumping pipe, the tail end of the pumping pipe is connected with a flexible pipe through a rotary joint, the flexible pipe is communicated with the tail ends of the material guide pipelines, and the two groups of pumping pipes are correspondingly communicated with one group of material guide pipelines respectively.

Further, the shell lower extreme is the cross and distributes and is provided with four group's supports, support end-to-end connection is provided with the universal wheel, it is provided with the mounting plate still to fix horizontally between the universal wheel, mounting plate upper end mid-mounting is provided with the motor, the output of motor passes through transmission structure and drives guide pipeline and drive shaft rotation.

Furthermore, the transmission structure comprises a driving gear fixed on the periphery of the output end of the motor in a sleeved mode, a first transmission gear fixed on the periphery of the material guide pipeline in a sleeved mode, and a second transmission gear fixed on the periphery of the driving shaft in a sleeved mode, and the driving gear is in meshing transmission with the two groups of first transmission gears and the two groups of second transmission gears located on the side edge of the driving gear respectively.

Further, the movable upper cover structure comprises an upper cover plate and two groups of containing covers connected to the upper cover plate, limiting bulges are symmetrically and fixedly arranged at the lower end of the upper cover plate, the limiting bulges are movably matched with the upper end of the shell in a matched mode, and hanging rings are symmetrically and fixedly arranged at the upper end of the upper cover plate.

Furthermore, the positions of the lower end of the upper cover plate and the two groups of containing cavities are symmetrically connected with a rotating structure, the rotating structure is opposite to the circle centers of the two groups of containing cavity end faces respectively, the rotating structure comprises a telescopic rod which is connected to the side face of the upper cover plate in a rotating mode through a bearing seat, the telescopic rod is formed by sleeving a sleeve and a sliding rod which are connected through elastic springs, one end, far away from the bearing seat, of the telescopic rod is fixedly connected to the circle center position of the side face of the containing cover, and the size diameter of the containing cover is matched with the end face.

Compared with the prior art, the invention has the beneficial effects that: the material is put into two groups of containing cavities through the upper end of the shell, equal amounts of cement and water glass are respectively placed in the containing cavities, the upper cover plate is assembled on the shell in a limiting mode through the limiting protrusions, the containing covers and the containing cavities are oppositely and movably attached, the containing covers are pressed on the containing cavities and can compress the telescopic rods, so that the telescopic rods are elastically compressed through the reaction force of the telescopic rods, when the containing cavities are driven to rotate, the containing covers can synchronously rotate with the containing cavities through the rotating connection of the telescopic rods and the bearing seats, and therefore the device can be guaranteed not to be interfered by external impurities when being used, and is convenient to install and convenient to add the material and; the starting motor drives the driving gear to rotate, and the material guide pipeline, the rotating bottom plate and the containing cavity can be driven to rotate through the meshing transmission of the driving gear, the first transmission gear and the second transmission gear, so that the materials are guaranteed to continuously shake during output, the precipitation and condensation of the materials are avoided, and the use efficiency is improved; meanwhile, the rotation of the second transmission gear drives the driving shaft to rotate, so that the driving shaft drives the curved rod to synchronously rotate when rotating, the piston is pulled to reciprocate in the material pumping cavity through the rotating sleeve and the connecting rod, the material is pumped into the material through the material pumping pipe, the tail end of the material pumping cavity is also provided with the material injection pipe in a penetrating mode, the material injection pipe penetrates through the side wall of the shell, the tail end of the material injection pipe can be communicated with the perforated pipe through a hose, the final grouting is finished, double-pipe grouting can be formed, the best material injection ratio is summarized according to actual construction, and cement and water glass in two sets of accommodating cavities can be guaranteed to be 1 by the material injection mode: 1 grouting, thereby ensuring the construction quality, improving the construction accuracy and being more scientific and accurate compared with the traditional grouting amount control mode.

Drawings

Fig. 1 is a schematic structural view of a double-fluid grouting apparatus for geotechnical engineering foundation reinforcement.

Fig. 2 is a schematic structural view in the direction a-a of a dual-fluid grouting apparatus for geotechnical engineering ground stabilization.

Fig. 3 is a top view of a casing in a dual fluid grouting apparatus for geotechnical engineering reinforcement of foundation.

Fig. 4 is a schematic structural view of a pumping structure in a double-fluid grouting device for geotechnical engineering foundation reinforcement.

Fig. 5 is a schematic structural view of an upper cover plate in a dual-fluid grouting apparatus for geotechnical engineering foundation reinforcement.

In the figure: 1-shell, 2-rotating bottom plate, 3-containing cavity, 4-guiding pipeline, 5-first transmission gear, 6-bracket, 7-universal wheel, 8-mounting plate, 9-motor, 10-driving gear, 11-driving shaft, 12-second transmission gear, 13-material pumping cavity, 14-curved rod, 15-rotating sleeve, 16-connecting rod, 17-piston, 18-material pumping pipe, 19-material injection pipe, 20-flexible pipe, 21-upper cover plate, 22-hanging ring, 23-bearing seat, 24-telescopic rod, 25-containing cover and 26-limiting protrusion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 1 to 4, in the embodiment of the invention, a double-fluid grouting device for geotechnical engineering foundation reinforcement comprises a housing 1, two sets of symmetrically arranged rotating bottom plates 2 are rotatably connected and arranged in the housing 1 through a material guide pipeline 4, an accommodating cavity 3 for accommodating cement slurry and water glass is fixedly arranged on each rotating bottom plate 2, a material pumping structure which is communicated with the accommodating cavity 3 through the material guide pipeline 4 and pumps out materials intermittently is further fixedly arranged in the housing 1, the material pumping structure and the material guide pipeline 4 are both synchronously driven through a transmission structure, and when the material guide pipeline 4 rotates, the materials are pumped into the material pumping structure through the material guide pipeline 4 intermittently and are discharged.

The holding chamber 3 is a holding structure commonly used in the prior art and used for storing and placing cement slurry and water glass, the internal structures of the two sets of holding chambers 3 can be the same or different, the holding chamber 3 and the rotating bottom plate 2 are assembled in a riveting mode or fixed in a welding mode, the lower end of the holding chamber 3 is communicated with the material guide pipeline 4, the holding chamber 3 rotates under the driving of the rotating bottom plate 2, and materials can be discharged through the material guide pipeline 4.

The material pumping structure comprises two groups of material pumping cavities 13 fixed in the shell 1, wherein the tail ends of the two groups of material pumping cavities 13 are respectively provided with a material pumping pipe 18 in a penetrating manner, a one-way valve communicated from the outside to the inside of the material pumping cavities 13 is arranged in the material pumping pipe 18, the tail ends of the material pumping pipes 18 are connected and provided with a flexible pipe 20 through a rotary joint, the flexible pipe 20 is communicated with the tail ends of the material guide pipelines 4, and the two groups of material pumping pipes 18 are respectively communicated with one group of material guide pipelines 4 correspondingly, so that materials stored in the accommodating cavities 3 can be respectively pumped out; the side, far away from the material pumping pipe 18, of the material pumping cavity 13 is rotatably connected with a curved rod 14, the curved rod 14 is of a structure like a Chinese character ji, one end of the curved rod 14 penetrates through the material pumping cavity 13 and is connected with a driving shaft 11 penetrating through the shell 1, the driving shaft 11 synchronously rotates with the material guide pipeline 4 through a transmission structure, the middle part of the periphery of the curved rod 14 is rotatably sleeved with a rotating sleeve 15, the side edge of the rotating sleeve 15 is connected with a piston 17 through a connecting rod 16, the side edge of the piston 17 is rotatably connected with the connecting rod 16 in a hinged mode, the piston 17 is arranged in the inner wall of the material pumping cavity 13 in a sliding fit manner, so that the driving shaft 11 drives the curved rod 14 to synchronously rotate when rotating, the piston 17 is pulled to reciprocate in the material pumping cavity 13 through the rotating sleeve 15 and the connecting rod 16, the material is pumped through the material pumping pipe 18, the tail end of the material pumping cavity 13, the material injection pipe 19 is internally provided with a one-way valve which is communicated from the material pumping cavity 13 to the outside, and the tail end of the material injection pipe 19 can be communicated with the perforated pipe through a hose, so that the final grouting is completed.

The utility model discloses a portable electronic device, including shell 1, support 6, universal wheel 7, set plate 8, motor 9, the output of motor 9 passes through transmission structure and drives guide pipeline 4 and drive shaft 11 rotation, the lower extreme of shell 1 is the cross distribution and is provided with four group's supports 6, 6 end-to-end connection of support is provided with universal wheel 7, supports shell 1 and provides the removal effect through support 6 and universal wheel 7, it is fixed to go back the level between the universal wheel 7 and is provided with set plate 8, the installation of set plate 8 upper end middle part is provided.

The transmission structure comprises a driving gear 10 which is sleeved and fixed on the periphery of the output end of the motor 9, a first transmission gear 5 which is sleeved and fixed on the periphery of the material guide pipeline 4 and a second transmission gear 12 which is sleeved and fixed on the periphery of the driving shaft 11, the driving gear 10 is respectively engaged with two groups of first transmission gears 5 and two groups of second transmission gears 12 which are positioned at the side of the driving gear 10 for transmission, thus, the effect of the motor 9 driving the material guide pipeline 4 and the driving shaft 11 to synchronously rotate can be achieved, thereby, the accommodating cavity 3 is driven to rotate to avoid the solidification and precipitation of the materials, and simultaneously, the materials can be continuously driven to be drawn out from the accommodating cavity 3 through the material guide pipeline 4, and the effect of pouring out through notes material pipe 19 can form double-barrelled slip casting like this, and according to the best notes material ratio that the actual construction summarized, cement and water glass in two sets of holding chambeies 3 can be guaranteed to such notes material mode is 1: 1 slip casting, if need change the slip casting proportion, only need adjust the proportion of two sets of second drive gear 12, the drive ratio of gear has changed once so, two sets of material of taking out of material structure annotate the material speed and will change, thereby change the slip casting ratio of material, and the change of these sizes technical personnel in the field can be adjusted as required activity, also no longer give unnecessary details in this application, and the above-mentioned cooperation design of these structures, the quality of construction has been guaranteed, construction accuracy is improved, more scientific and accurate for the mode of traditional control slip casting volume.

Example 2

Referring to fig. 1 and 5, in the embodiment of the present invention, on the basis of embodiment 1, a movable upper cover structure for blocking the accommodating cavity 3 is movably assembled at the upper end of the housing 1, the movable upper cover structure includes an upper cover plate 21 and two groups of accommodating covers 25 connected to the upper cover plate 21, limiting protrusions 26 are symmetrically and fixedly disposed at two sides of the lower end of the upper cover plate 21, and are movably matched with the upper end of the housing 1 through the limiting protrusions 26, hanging rings 22 are symmetrically and fixedly welded at two sides of the upper end of the upper cover plate 21, and the upper cover plate 21 can be suspended and lifted by the hanging rings 22; the position that upper cover plate 21 lower extreme and two sets of holding chamber 3 correspond is provided with rotating-structure still symmetrical connection, rotating-structure is relative with the centre of a circle of 3 terminal surfaces in two sets of holding chamber respectively, rotating-structure includes that the telescopic link 24 of connecting in upper cover plate 21 side is rotated through bearing frame 23, telescopic link 24 is cup jointed by the sleeve and the slide bar that pass through spring elastic connection and is constituteed, the one end that bearing frame 23 was kept away from to telescopic link 24 is through riveting or welding mode fixed connection in the side centre of a circle position of holding lid 25, holding lid 25 chi footpath and holding chamber 3 terminal surface looks adaptation.

In the use, if need continuously add thick liquids, only need with the upper cover structure hoist, directly to two sets of holding chambeies 3 in pour into thick liquids can, because holding chamber 3 self-rotation can not influence thick liquids and pour into, consequently can realize that continuous processing is annotated the material, the practicality can not receive the influence.

Like this at upper cover plate 21 through spacing assembly of spacing protruding 26 on shell 1, holding lid 25 and holding chamber 3 are relative and the activity laminating, holding lid 25 presses can compress telescopic link 24 on holding chamber 3, thereby compress tightly through telescopic link 24 reaction force elasticity, when holding chamber 3 is driven and rotates, holding lid 25 is connected through telescopic link 24 and bearing frame 23 rotation and can be rotated with holding chamber 3 synchronous, can guarantee like this that the device can not disturbed by external impurity when using, and simple to operate, be convenient for add the material and maintain and overhaul.

The working principle of the invention is as follows: when the device is used, materials are put into the two groups of containing cavities 3 through the upper end of the shell 1, equal amounts of cement and water glass are respectively placed in the containing cavities 3, the upper cover plate 21 is assembled on the shell 1 in a limiting mode through the limiting protrusions 26, the containing cover 25 and the containing cavities 3 are oppositely and movably attached, the containing cover 25 is pressed on the containing cavities 3 and can compress the telescopic rods 24, so that the telescopic rods 24 are elastically compressed through the reaction force of the telescopic rods 24, when the containing cavities 3 are driven to rotate, the containing cover 25 can synchronously rotate with the containing cavities 3 through the rotating connection of the telescopic rods 24 and the bearing seats 23, the device can be guaranteed not to be interfered by external impurities when in use, and the device is convenient to install and is convenient to add; the starting motor 9 drives the driving gear 10 to rotate, and the driving gear 10, the first transmission gear 5 and the second transmission gear 12 are meshed for transmission to drive the material guide pipeline 4, the rotating bottom plate 2 and the accommodating cavity 3 to rotate, so that the materials are guaranteed to continuously shake during output, precipitation and condensation of the materials are avoided, and the use efficiency is improved; meanwhile, the rotation of the second transmission gear 12 drives the driving shaft 11 to rotate, so that the driving shaft 11 drives the curved rod 14 to synchronously rotate when rotating, the piston 17 is pulled to reciprocate in the material pumping cavity 13 through the rotating sleeve 15 and the connecting rod 16, materials are pumped through the material pumping pipe 18, the tail end of the material pumping cavity 13 is also provided with a material injection pipe 19 in a penetrating mode, the material injection pipe 19 penetrates through the side wall of the shell 1, the tail end of the material injection pipe 19 can be communicated with the perforated pipe through a hose, and final grouting is finished, so that double-pipe grouting can be formed, and according to the optimal grouting ratio summarized in actual construction, cement and water glass in the two groups of accommodating cavities 3 can be ensured to be 1 by the material injection mode: 1 grouting, thereby ensuring the construction quality, improving the construction accuracy and being more scientific and accurate compared with the traditional grouting amount control mode.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A double-liquid grouting device for geotechnical engineering foundation reinforcement comprises a shell (1), two groups of symmetrically arranged rotating bottom plates (2) are rotatably connected and arranged in the shell (1) through a material guide pipeline (4), two containing cavities (3) which are respectively used for containing cement paste and water glass are fixedly arranged on the rotating bottom plate (2), it is characterized in that a material pumping structure which is communicated with the containing cavity (3) through a material guide pipeline (4) and pumps out materials intermittently is fixedly arranged in the shell (1), the material pumping structure and the material guide pipeline (4) are synchronously driven through a transmission structure, when the material guide pipeline (4) rotates, the material is intermittently pumped into the material pumping structure through the material guide pipeline (4) by the material pumping structure and is discharged, the upper end of the shell (1) is movably provided with a movable upper cover structure for plugging the accommodating cavity (3).

2. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 1, wherein the accommodating cavity (3) is fixedly connected with the rotating bottom plate (2), and the lower end of the accommodating cavity (3) is communicated with the material guide pipeline (4).

3. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 1, wherein the pumping structure comprises two groups of pumping cavities (13) fixed in a shell (1), the tail ends of the two groups of pumping cavities (13) are respectively provided with a pumping pipe (18) in a penetrating manner, one side of each pumping cavity (13) far away from the pumping pipe (18) is rotatably connected with a curved rod (14), the curved rod (14) is of a structure shaped like a Chinese character 'ji', one end of each curved rod (14) penetrates through the pumping cavity (13) and is connected with a driving shaft (11) arranged through the shell (1), the driving shaft (11) synchronously rotates with a material guide pipeline (4) through a transmission structure, the middle part of the periphery of the curved rod (14) is rotatably sleeved with a rotating sleeve (15), the side of the rotating sleeve (15) is connected with a piston (17) through a connecting rod (16), and the side of the piston (17) is rotatably connected with the connecting rod (16) in a hinged manner, the piston (17) is arranged in the inner wall of the material pumping cavity (13) in a sliding fit mode.

4. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 3, wherein a one-way valve communicated with the inside of the pumping cavity (13) from outside is arranged in the pumping pipe (18), the tail end of the pumping pipe (18) is provided with a flexible pipe (20) through a rotary joint in a connected mode, the flexible pipe (20) is communicated with the tail ends of the guide pipelines (4), and two groups of pumping pipes (18) are respectively and correspondingly communicated with one group of guide pipelines (4).

5. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 3, wherein four groups of supports (6) are distributed on the lower end of the shell (1) in a cross shape, the supports (6) are connected with the tail ends and provided with universal wheels (7), a mounting plate (8) is horizontally and fixedly arranged between the universal wheels (7), a motor (9) is arranged in the middle of the upper end of the mounting plate (8), and the output end of the motor (9) drives the guide pipeline (4) and the driving shaft (11) to rotate through a transmission structure.

6. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 5, wherein the transmission structure comprises a driving gear (10) fixed on the periphery of the output end of the motor (9) in a sleeved mode, a first transmission gear (5) fixed on the periphery of the material guide pipeline (4) in a sleeved mode and a second transmission gear (12) fixed on the periphery of the driving shaft (11) in a sleeved mode, and the driving gear (10) is in meshing transmission with the two groups of first transmission gears (5) and the two groups of second transmission gears (12) located on the side edge of the driving gear (10) respectively.

7. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 1, wherein the movable upper cover structure comprises an upper cover plate (21) and two sets of containing covers (25) connected to the upper cover plate (21), limiting protrusions (26) are symmetrically and fixedly arranged on two sides of the lower end of the upper cover plate (21), the limiting protrusions (26) are movably matched with the upper end of the shell (1) in a matched mode, and hanging rings (22) are symmetrically and fixedly arranged on two sides of the upper end of the upper cover plate (21).

8. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 7, wherein the lower end of the upper cover plate (21) and the corresponding positions of the two sets of accommodating cavities (3) are symmetrically connected and provided with rotating structures, the rotating structures are respectively opposite to the circle centers of the end surfaces of the two sets of accommodating cavities (3), and each rotating structure comprises an expansion rod (24) which is rotatably connected to the side surface of the upper cover plate (21) through a bearing seat (23).

9. The double-liquid grouting equipment for geotechnical engineering foundation reinforcement according to claim 8, wherein the telescopic rod (24) is formed by sleeving a sleeve and a sliding rod which are elastically connected through a spring, one end of the telescopic rod (24) far away from the bearing seat (23) is fixedly connected to the circle center position of the side face of the accommodating cover (25), and the size diameter of the accommodating cover (25) is matched with the end face of the accommodating cavity (3).