CN112478580A

CN112478580A - Intelligent plate raw material processing equipment for plastic product production

Info

Publication number: CN112478580A
Application number: CN202011184505.XA
Authority: CN
Inventors: 陈壮
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-03-12

Abstract

The invention discloses intelligent plate raw material processing equipment for plastic product production, which comprises a working platform, an internal thread block, a negative pressure gas transmission instrument, a limiting rod and a convex block, wherein a placing frame is fixedly arranged on the left side of the upper surface of the working platform, the upper ends of sliding rings are symmetrically arranged on the internal thread block, the negative pressure gas transmission instrument is fixedly arranged in the middle position inside the working platform, a positioning block is fixedly arranged on the right side of the upper surface of the working platform, an internal electric telescopic rod is fixedly arranged on the lower surface of the mounting block, an external gear is fixedly arranged on the outer side surface of an adjusting pipe, and a sliding groove is formed in the upper surface of the positioning block. This an intelligent panel raw materials processing equipment for plastic products production adopts neotype structural design for this device can control the corresponding angle of plastic panel material loading, and is provided with plastic panel material loading metering structure among the device, is convenient for in time supply plastic panel, keeps the continuity of device material loading.

Description

Intelligent plate raw material processing equipment for plastic product production

Technical Field

The invention relates to the technical field of intelligent production, in particular to intelligent plate raw material processing equipment for plastic product production.

Background

The intelligent manufacturing is the technology that combines advanced intelligent device to carry out industrial production, along with the continuous update of mechanical science and technology, the intelligent degree that intelligent production equipment used is more and more high, industrial production's efficiency and accuracy are also more and more high, intelligent manufacturing replaces a lot of manual works, especially partial manual operation is dangerous operation more, plastic products can realize intelligent manufacturing through automatic feeding equipment at the in-process of production, improvement production efficiency that can be very big through mechanical structure automatic conveying plastic board.

With the continuous processing and use of the automatic plate feeding device, the following problems are found in the use process:

1. the automatic board feeding device for the board cutting production line with the publication number of CN201821248170.1 can only convey a board structure in a single direction, the feeding structure of a plastic board in the processing process is inconvenient to simultaneously correspond to a plurality of processing devices, and the processing devices corresponding to the feeding are single.

2. And some current panel automatic feeding devices are not convenient for calculate the quantity of material loading panel at the in-process that uses to be not convenient for in time remind the staff to supply the panel of processing, the continuity of panel material loading is lower.

Therefore, an intelligent plate raw material processing device for plastic product production needs to be designed aiming at the problems.

Disclosure of Invention

The invention aims to provide intelligent plate raw material processing equipment for plastic product production, and aims to solve the problems that the existing automatic plate feeding devices in the background art can only convey plate structures in a single direction, the feeding structures of plastic plates are inconvenient to simultaneously correspond to a plurality of processing devices in the processing process, the processing devices corresponding to feeding are single, and the existing automatic plate feeding devices are inconvenient to calculate the number of the fed plates in the using process, so that workers are inconvenient to timely remind of supplementing the processed plates, and the continuity of plate feeding is low.

In order to achieve the purpose, the invention provides the following technical scheme: an intelligent plate raw material processing device for plastic product production comprises a working platform, an internal thread block, a negative pressure gas transmission instrument, a limiting rod and a convex block, wherein a placing frame is fixedly arranged on the left side of the upper surface of the working platform, a bottom cylinder is fixedly arranged at the lower end of the working platform, an alarm is electrically connected to the side surface of the bottom cylinder, a supporting plate is welded at the upper end of the bottom cylinder, a lead screw is rotatably arranged on the outer side surface of the working platform, a sliding rod is fixedly connected to the outer side surface of the working platform, a sliding ring is movably arranged outside the sliding rod, the internal thread block is symmetrically provided with the upper end of the sliding ring, an external electric telescopic rod is fixedly arranged on the upper surface of the internal thread block, an installation block is welded at the upper end of the external electric telescopic rod, the negative pressure gas transmission instrument is fixedly arranged at the middle position inside of, and the inner side of the upper end of the transmission pipe is provided with an adjusting pipe, the lower end of the adjusting pipe is fixedly provided with an adsorption head, the right side of the upper surface of the working platform is fixedly provided with a positioning block, the working platform is mutually connected with the conveying plate through a bottom rotating shaft, the lower surface of the conveying plate is provided with a ball, the inner side of the upper end of the conveying plate is rotatably provided with a conveying shaft, the lower surface of the mounting block is fixedly provided with an inner electric telescopic rod, the inner electric telescopic rod is mutually connected with a bottom plate through a push rod, the two sides of the inner part of the working platform are symmetrically provided with side cylinders, the upper surfaces of the side cylinders are fixedly connected with a fixed plate, the upper end of the fixed plate is rotatably provided with a driving gear, the outer side surface of the adjusting pipe is fixedly provided, the upper surface of the positioning block is provided with a sliding groove, and a limiting groove is reserved on the inner side surface of the positioning block.

Preferably, the backup pad passes through bottom cylinder and constitutes extending structure with work platform, and the backup pad is connected with the rack block to the backup pad corresponds the setting in the inboard intermediate position of rack.

Preferably, the internal thread block and the sliding ring are of an integrated structure, the internal thread block is in threaded connection with the screw rod, and the sliding ring and the sliding rod form a sliding structure.

Preferably, the adjusting pipe and the transmission pipe form a telescopic structure, the adjusting pipe is fixedly connected with the external gear, and the external gear is meshed with the driving gear.

Preferably, the conveying plate and the positioning block form a rotating structure through a ball and a sliding groove, the sliding groove is of a circular ring-shaped structure, and the width of the conveying plate is smaller than the outer diameter of the positioning block.

Preferably, the bottom plate and the mounting block form a rotating structure, the bottom plate is rotatably connected with one end of the push rod, and the other end of the push rod is rotatably connected with the inner side electric telescopic rod.

Preferably, the fixed plate forms a lifting structure with the working platform through the side cylinder, and the fixed plate is fixedly connected with the adjusting pipe.

Preferably, the limiting rod is fixedly installed outside the bottom rotating shaft, the outer side surface of the limiting rod is connected with the built-in rod through a limiting spring, and a convex block is welded on the outer side surface of the built-in rod.

Preferably, the lug forms a telescopic structure with the limiting rod through the built-in rod, the built-in rod forms an elastic structure with the limiting rod through the limiting spring, the lug is connected with the positioning block in a clamping mode through the limiting groove, and meanwhile the limiting groove is arranged on the inner side face of the positioning block in an encircling mode at equal intervals.

Compared with the prior art, the invention has the beneficial effects that: the intelligent plate raw material processing equipment for plastic product production adopts a novel structural design, so that the device can conveniently control the direction of plate feeding and conveying, and can simultaneously correspond to different processing equipment;

1. the conveying plate is arranged through a rotating structure, the lug and the limiting groove are arranged through a clamping connection structure, after the plastic plate is conveyed to the upper end of the conveying shaft, the corresponding equipment is processed according to the plate, the bottom rotating shaft is controlled to rotate through a running motor, the conveying plate at the upper end and the plastic plate are driven by the bottom rotating shaft to rotate and are adjusted to proper angle positions, the plate can correspond to different processing equipment to be used, meanwhile, the limiting rod and the lug are driven by the rotating shaft at the bottom to rotate and are clamped in the corresponding limiting groove, different limiting grooves correspond to different rotating gears, the conveying plate corresponds to different processing equipment when rotating to different gears, and the accuracy of the feeding position of the conveying plate in a rotating mode is improved;

2. the backup pad that extending structure set up to and the bottom cylinder and the siren that electric connection set up, when a plastics panel of material loading, the bottom cylinder promotes the backup pad rebound certain distance, the distance of removal is the same with the thickness of plastics panel, when bottom cylinder promotes the backup pad rebound to the top position, plastics panel in the rack was moved the material loading completely this moment, the siren operation reminds the staff in time to supply the plastics panel structure in the rack this moment, increase the continuity of the device transport plastics panel process.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic side view of the outer electric telescopic rod of the present invention;

FIG. 3 is a front view of the fixing plate according to the present invention;

FIG. 4 is a schematic diagram of the front structure of the infrared distance measuring device of the present invention;

FIG. 5 is a front cross-sectional structural view of the support plate of the present invention;

FIG. 6 is a schematic top view of the conveying shaft of the present invention;

FIG. 7 is a front view of a partial structure of a bottom rotating shaft according to the present invention;

FIG. 8 is an enlarged view of the structure at A in FIG. 7 according to the present invention;

FIG. 9 is a schematic top view of a limiting groove according to the present invention.

In the figure: 1. a working platform; 2. placing a rack; 3. a bottom cylinder; 4. an alarm; 5. a support plate; 6. a screw rod; 7. a slide bar; 8. a slip ring; 9. an internal thread block; 10. an outer electric telescopic rod; 11. mounting blocks; 12. a negative pressure gas transmission instrument; 13. a conveying pipe; 14. an adjusting tube; 15. an adsorption head; 16. positioning blocks; 17. a bottom rotating shaft; 18. a conveying plate; 19. a ball bearing; 20. a delivery shaft; 21. an inner electric telescopic rod; 22. a push rod; 23. a base plate; 24. a side cylinder; 25. a fixing plate; 26. a drive gear; 27. an external gear; 28. an infrared range finder; 29. a sensor; 30. a chute; 31. a limiting groove; 32. a limiting rod; 33. a limiting spring; 34. a built-in rod; 35. and (4) a bump.

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.

Referring to fig. 1-9, the present invention provides a technical solution: an intelligent plate raw material processing device for plastic product production comprises a working platform 1, a placing rack 2, a bottom cylinder 3, an alarm 4, a supporting plate 5, a screw rod 6, a sliding rod 7, a sliding ring 8, an internal thread block 9, an outer electric telescopic rod 10, a mounting block 11, a negative pressure gas transmission instrument 12, a transmission pipe 13, a regulating pipe 14, an adsorption head 15, a positioning block 16, a bottom rotating shaft 17, a transmission plate 18, a ball 19, a transmission shaft 20, an inner electric telescopic rod 21, a push rod 22, a bottom plate 23, a side cylinder 24, a fixing plate 25, a driving gear 26, an external gear 27, an infrared distance measuring instrument 28, a sensor 29, a sliding groove 30, a limiting groove 31, a limiting rod 32, a limiting spring 33, a built-in rod 34 and a bump 35, wherein the placing rack 2 is fixedly mounted on the left side of the upper surface of the working platform 1, the bottom cylinder 3 is fixedly mounted at the lower end of the working platform, meanwhile, a supporting plate 5 is welded at the upper end of a bottom cylinder 3, a screw rod 6 is rotatably installed on the outer side surface of a working platform 1, a slide rod 7 is fixedly connected to the outer side surface of the working platform 1, a slide ring 8 is movably installed outside the slide rod 7, the upper end of the slide ring 8 is symmetrically installed on an internal thread block 9, an external electric telescopic rod 10 is fixedly installed on the upper surface of the internal thread block 9, an installation block 11 is welded at the upper end of the external electric telescopic rod 10, a negative pressure gas transmission instrument 12 is fixedly installed at the middle position inside the working platform 1, a transmission pipe 13 is fixedly installed on the front side surface of the negative pressure gas transmission instrument 12, an adjusting pipe 14 is installed on the inner side of the upper end of the transmission pipe 13, an adsorption head 15 is fixedly installed at the lower end of the adjusting pipe 14, a positioning block 16 is fixedly installed on, and the lower surface mounting of delivery board 18 has ball 19, simultaneously delivery board 18's upper end inboard is rotated and is installed delivery shaft 20, the lower fixed surface of installation piece 11 installs inboard electric telescopic handle 21, and inboard electric telescopic handle 21 passes through push rod 22 and bottom plate 23 interconnect, side cylinder 24 is installed to work platform 1's inside bilateral symmetry, and the last fixed surface of side cylinder 24 is connected with fixed plate 25, and drive gear 26 is installed in the upper end rotation of fixed plate 25, the lateral surface fixed mounting of regulating tube 14 has external gear 27, and the side fixed mounting of regulating tube 14 has infrared range finder 28, and the upper end electric connection of infrared range finder 28 has sensor 29, spout 30 has been seted up to the upper surface of locating piece 16, and the medial surface of locating piece 16 leaves spacing groove 31 in advance.

In the embodiment, the support plate 5 and the working platform 1 form a telescopic structure through the bottom cylinder 3, the support plate 5 is connected with the placing rack 2 in a clamping manner, the support plate 5 is correspondingly arranged at the middle position of the inner side of the placing rack 2, when one plastic plate is fed, the bottom cylinder 3 pushes the support plate 5 to move by a thickness distance corresponding to one plate, and when the plastic plates in the placing rack 2 are completely fed, the bottom cylinder 3 pushes the support plate 5 to move to the uppermost position;

the internal thread block 9 and the sliding ring 8 are of an integrated structure, the internal thread block 9 is in threaded connection with the screw rod 6, the sliding ring 8 and the sliding rod 7 form a sliding structure, the screw rod 6 is controlled to rotate by the operation motor, and the internal thread block 9 and the sliding ring 8 are controlled to simultaneously move transversely under the action of thread transmission;

the adjusting pipe 14 and the transmission pipe 13 form a telescopic structure, the adjusting pipe 14 is fixedly connected with an external gear 27, the external gear 27 is meshed with the driving gear 26, and the meshed transmission structure can control the adjusting pipe 14 to rotate towards the side surface, so that the plastic plate can move towards the right side for feeding;

the conveying plate 18 and the positioning block 16 form a rotating structure through the balls 19 and the sliding groove 30, the sliding groove 30 is of a circular ring structure, the width of the conveying plate 18 is smaller than the outer diameter of the positioning block 16, and the conveying plate 18 is controlled to rotate to a corresponding angle position, so that plastic plate processing equipment at different corresponding positions can be conveniently fed;

the bottom plate 23 and the mounting block 11 form a rotating structure, the bottom plate 23 is rotatably connected with one end of the push rod 22, the other end of the push rod 22 is rotatably connected with the inner side electric telescopic rod 21, the partial transmission structure can control the bottom plate 23 to rotate, and when the bottom plate 23 is rotated to a horizontal position, the plastic plate can be conveniently supported to move towards the side;

the fixed plate 25 and the working platform 1 form a lifting structure through the side cylinder 24, the fixed plate 25 is fixedly connected with the adjusting pipe 14, the lifting of the fixed plate 25 and the adjusting pipe 14 is controlled through the side cylinder 24, and the corresponding position between the adsorption head 15 and the plastic plate is controlled;

gag lever post 32 fixed mounting is in the outside of bottom pivot 17, and the lateral surface of gag lever post 32 passes through spacing spring 33 and built-in rod 34 interconnect, and the outside welding of built-in rod 34 has lug 35, lug 35 constitutes extending structure through built-in rod 34 and gag lever post 32, and built-in rod 34 passes through spacing spring 33 and gag lever post 32 and constitutes elastic construction, and lug 35 passes through spacing groove 31 and is connected with locating piece 16 block, the medial surface at locating piece 16 is seted up to equidistant encircleing form of spacing groove 31 simultaneously, the aforesaid project organization is convenient for comparatively accurate control delivery board 18 rotates and adjusts to corresponding angular position.

The working principle is as follows: when the device is used, firstly, according to the structure shown in fig. 1, fig. 2, fig. 3 and fig. 4, a plastic plate is placed in the placing rack 2, the infrared distance meter 28 detects and senses the distance between the plastic plate and the lower end, the side cylinder 24 pushes the fixed plate 25 to move downwards, the fixed plate 25 drives the adjusting pipe 14 to move towards the inside of the transmission pipe 13, so that the adsorption head 15 is attached to the upper end of the lower end of the plastic plate, at the moment, the negative pressure gas transmission instrument 12 operates to suck gas through the transmission pipe 13, the adjusting pipe 14 and the adsorption head 15 under negative pressure, so that the adsorption head 15 is closely attached to the upper end of the plastic plate, then the side cylinder 24 pushes the fixed plate 25 to move upwards, the plastic plate is driven to move upwards under the control action of the transmission structure, meanwhile, the outer electric telescopic rod 10 pushes the mounting block 11 to move upwards, the inner electric telescopic, meanwhile, the push rod 22 pushes the bottom plate 23 to move upwards, the bottom plate 23 is arranged on the lower surface of a plastic plate hoisted at the lower end of the adsorption head 15, the negative pressure gas transmission instrument 12 is operated to control the adsorption head 15 to exhaust gas, so that the adsorption head 15 and the plastic plate are separated from each other and fixed, the motor is operated to control the driving gear 26 to rotate, the driving gear 26 and the external gear 27 are connected in a meshed mode, the external gear 27 and the adjusting pipe 14 are controlled to rotate under the action of meshed transmission, the adjusting pipe 14 rotates to the 90-degree position towards the side surface, the motor on the left side of the lower end of the operating platform 1 is operated to control the lead screw 6 to rotate, the lead screw 6 is in threaded connection with the internal thread block 9, the internal thread block 9 and the sliding ring 8 are controlled to move towards the side surface transversely under the action of the threaded transmission, the sliding ring 8 slides on, when the plastic plate is moved to correspond to the upper end of the conveying plate 18, the outer electric telescopic rod 10 is contracted downwards to control the mounting block 11 and the bottom plate 23 to move downwards, so that the plastic plate is placed at the upper end of the conveying shaft 20, and then the screw rod 6 is controlled to rotate reversely to move the inner thread block 9 to an initial position;

subsequently, according to the structure shown in fig. 1, 5, 6, 7, 8 and 9, after the plastic plate is placed on the conveying shaft 20, the conveying shaft 20 is controlled to rotate by the operation motor (the conveying shafts 20 arranged in parallel rotate simultaneously under the circulating transmission action of the transmission gear and the transmission toothed chain arranged on the side surface), the plastic plate placed at the upper end is conveyed when the conveying shaft 20 rotates, the plastic plate is conveyed to the corresponding processing equipment, the conveying angle of the conveying plate 18 can be adjusted to control the conveying angle of the plastic plate according to the processing requirement, the bottom rotating shaft 17 is controlled to rotate by the operation bottom motor, the bottom rotating shaft 17 drives the limiting rod 32 to rotate, the limiting rod 32 drives the lug 35 at the outer side to rotate through the built-in rod 34 in the rotating process, when the lug 35 rotates to the limiting groove 31 corresponding to the corresponding position, the lug 35 can be pushed to be clamped into the corresponding limiting groove 31 under the elastic action of the limiting spring 33 (because the outer side surface of the lug 35 is in the spherical structure) Therefore, the limiting rod 32 continues to rotate in the clamping state, the bump 35 pushes the built-in rod 34 to compress the limiting spring 33 to the side, the bump 35 can rotate to be separated from the corresponding limiting groove 31, the limiting grooves 31 at different positions correspond to different rotating gears, the conveying plate 18 can be assisted to rotate and adjust relatively accurately), the bottom motor stops running, the arrangement of the partial structure can control the conveying plate 18 to rotate to the corresponding angle position, different angle positions correspond to different plastic plate subsequent processing equipment, and the device can be controlled to simultaneously feed different production and processing equipment;

then, according to the structure shown in fig. 1 and 5, as the plastic plates in the rack 2 are continuously loaded, the bottom cylinder 3 pushes the support plate 5 to gradually move upwards, and when one plastic plate is loaded, the bottom cylinder 3 pushes the support plate 5 to move by a thickness distance corresponding to one plate, after the plastic plates in the rack 2 are completely loaded, the bottom cylinder 3 pushes the support plate 5 to move to the uppermost position, and at the moment, the alarm 4 operates to remind a worker to timely supplement the plastic plates in the rack 2, so that the loading continuity of the device is maintained.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an intelligent panel raw materials processing equipment for plastic products production, includes work platform (1), internal thread piece (9), defeated gas appearance of negative pressure (12), gag lever post (32) and lug (35), its characterized in that: the automatic air-conveying device is characterized in that a placing frame (2) is fixedly mounted on the left side of the upper surface of the working platform (1), a bottom cylinder (3) is fixedly mounted at the lower end of the working platform (1), an alarm (4) is electrically connected to the side surface of the bottom cylinder (3), a supporting plate (5) is welded at the upper end of the bottom cylinder (3), a lead screw (6) is rotatably mounted on the outer side surface of the working platform (1), a sliding rod (7) is fixedly connected to the outer side surface of the working platform (1), a sliding ring (8) is movably mounted on the outer portion of the sliding rod (7), the upper ends of the sliding ring (8) are symmetrically mounted on the inner thread blocks (9), an outer electric telescopic rod (10) is fixedly mounted on the upper surface of the inner thread blocks (9), a mounting block (11) is welded at the upper end of the outer electric telescopic rod (10), and, a transmission pipe (13) is fixedly installed on the front side face of the negative pressure gas transmission instrument (12), an adjusting pipe (14) is installed on the inner side of the upper end of the transmission pipe (13), an adsorption head (15) is fixedly installed at the lower end of the adjusting pipe (14), a positioning block (16) is fixedly installed on the right side of the upper surface of the working platform (1), the working platform (1) is connected with a conveying plate (18) through a bottom rotating shaft (17), balls (19) are installed on the lower surface of the conveying plate (18), a conveying shaft (20) is rotatably installed on the inner side of the upper end of the conveying plate (18), an inner electric telescopic rod (21) is fixedly installed on the lower surface of the installation block (11), the inner electric telescopic rod (21) is connected with a bottom plate (23) through a push rod (22), and side cylinders (24) are symmetrically installed on two sides in the working platform (, and the upper surface fixed connection of side cylinder (24) has fixed plate (25) to drive gear (26) are installed in the upper end rotation of fixed plate (25), the lateral surface fixed mounting of control tube (14) has external gear (27), and the side fixed mounting of control tube (14) has infrared range finder (28), and the upper end electric connection of infrared range finder (28) has sensor (29), spout (30) have been seted up to the upper surface of locating piece (16), and the medial surface of locating piece (16) is reserved has spacing groove (31).

2. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: backup pad (5) constitute extending structure through bottom cylinder (3) and work platform (1), and backup pad (5) are connected with rack (2) block to backup pad (5) correspond the inboard intermediate position that sets up at rack (2).

3. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: the internal thread block (9) and the sliding ring (8) are of an integrated structure, the internal thread block (9) is in threaded connection with the screw rod (6), and the sliding ring (8) and the sliding rod (7) form a sliding structure.

4. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: the adjusting pipe (14) and the transmission pipe (13) form a telescopic structure, the adjusting pipe (14) is fixedly connected with the external gear (27), and the external gear (27) is meshed with the driving gear (26).

5. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: the conveying plate (18) and the positioning block (16) form a rotating structure through a ball (19) and a sliding groove (30), the sliding groove (30) is of an annular structure, and the width of the conveying plate (18) is smaller than the outer diameter of the positioning block (16).

6. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: the bottom plate (23) and the mounting block (11) form a rotating structure, the bottom plate (23) is rotatably connected with one end of the push rod (22), and the other end of the push rod (22) is rotatably connected with the inner side electric telescopic rod (21).

7. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: the fixed plate (25) forms a lifting structure with the working platform (1) through the side cylinder (24), and the fixed plate (25) is fixedly connected with the adjusting pipe (14).

8. The intelligent plate raw material processing equipment for plastic product production according to claim 1, wherein: the limiting rod (32) is fixedly installed outside the bottom rotating shaft (17), the outer side face of the limiting rod (32) is connected with the built-in rod (34) through a limiting spring (33), and a convex block (35) is welded on the outer side face of the built-in rod (34).

9. The intelligent plate raw material processing equipment for plastic product production according to claim 8, wherein: the bump (35) and the limiting rod (32) form a telescopic structure through the built-in rod (34), the built-in rod (34) and the limiting rod (32) form an elastic structure through the limiting spring (33), the bump (35) is connected with the positioning block (16) in a clamping mode through the limiting groove (31), and meanwhile the limiting groove (31) is arranged on the inner side face of the positioning block (16) in an encircling mode at equal intervals.