CN113858138B - Electric power maintenance overhauls with instrument self-align's maintenance tool car - Google Patents

Abstract

The invention discloses an electric power maintenance and overhaul tool vehicle with self-positioning instruments, which comprises a storage box body, wherein the upper end of the storage box body is fixedly connected with a workbench surface in a horizontal state, the middle part of a connecting block is inserted with a mounting rod in a vertical state, the connecting table is respectively connected with the middle part of the workbench surface and the middle part of the lower end of the storage box body in a telescopic manner, and limiting mechanisms are symmetrically arranged on the left side and the right side of a placing plate. This electric power maintenance overhauls with instrument self-align's maintenance tool car is convenient for to maintenance instrument and maintenance equipment deposit the in-process, fixes a position it, through the setting of light, is convenient for reach more convenient result of use at night and under the condition that light is not good to connect the platform telescopic connection on table surface and deposit the box, be convenient for adjust table surface's usable floor area according to the in-service use condition, shrink the connection platform after the end of use simultaneously and deposit, reduce occupation of land space.

Description

Electric power maintenance overhauls with instrument self-align's maintenance tool car

Technical Field

The invention relates to the technical field related to electric power maintenance and overhaul, in particular to an overhaul tool vehicle for self-positioning of an electric power maintenance and overhaul instrument.

Background

In an electric power system, equipment in the system needs to be maintained and overhauled regularly, so that various electric power equipment can run normally and stably, corresponding overhauling tools and overhauling equipment are needed in the process of maintaining and overhauling the electric power equipment, and the overhauling tools and the overhauling equipment are needed to be stored in corresponding overhauling tool vehicles because of the large number of types of the overhauling tools and the overhauling equipment, and the overhauling tool vehicles play an important role in the process of maintaining and overhauling the electric power;

however, the commonly used service tool cart for electric power maintenance and repair has the following disadvantages in the actual use process:

1. the existing maintenance tool vehicle for electric power maintenance and overhaul has the defects that the size of a working table is certain in the actual use process, the size of the working table is inconvenient to adjust according to the actual use condition, and the working table is contracted and stored after the use is finished;

2. the existing maintenance tool vehicle for electric power maintenance and overhaul has the defects that the limit effect is poor on maintenance tools and maintenance equipment in the storage process, the maintenance tools and the maintenance equipment are easy to fall to cause damage, and in the moving process, when the road surface is uneven, the maintenance tools and the maintenance equipment are inconvenient to buffer, so that the protection effect is poor;

3. the existing maintenance tool vehicle for electric power maintenance and overhaul is inconvenient to use at night or under the condition of poor light conditions, influences the actual maintenance and overhaul effect, is low in practicality and is not suitable for popularization and use.

Therefore, we propose an electric power maintenance and overhaul tool vehicle with self-positioning of the apparatus so as to solve the above-mentioned problems.

Disclosure of Invention

The invention aims to provide an electric power maintenance and overhaul tool vehicle capable of self-positioning an instrument, which is used for solving the problems that in the prior art, the size of a workbench surface is certain in the actual use process, the workbench surface is inconvenient to adjust according to the actual use condition, shrinkage storage is carried out after the use is finished, the limit effect is poor on the overhaul tool and overhaul equipment in the storage process, the overhaul tool and the overhaul equipment are easy to fall to cause damage in the moving process, the overhaul tool and the overhaul equipment are inconvenient to buffer when the road surface is uneven, the protection effect is poor, the use is inconvenient under the condition of bad night or light condition, the actual maintenance and overhaul effect is influenced, the practicability is not high, and the popularization and the use are not suitable.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an electric power maintenance overhauls with instrument self-positioning's maintenance tool car, includes deposits the box, deposit the upper end fixedly connected with of box and be the table surface of horizontality, and the left end fixedly connected with connecting block of table surface, the middle part of connecting block peg graft have be the installation pole of vertical state, and install the light in the upper right end of installation pole;

the right end of the connecting table is connected with the fixed plate, 2 connecting tables are arranged on the connecting table, and the connecting tables are respectively connected with the middle part of the working table and the middle part of the lower end of the storage box body in a telescopic manner;

wherein, the middle part of the fixed plate is fixedly connected with a vertical rod with supporting function; universal wheels are arranged at the lower ends of the fixing plate and the storage box body;

the limiting mechanism comprises a limiting column inserted in the middle of the placing plate in a horizontal state, a mounting block fixedly connected to one end of the limiting column, which is close to the vertical central axis of the placing plate, a movable block with a limiting function and a second spring fixedly connected to the movable block;

wherein, stop gear symmetry sets up the left and right sides at the board of placing.

Preferably, an auxiliary plate is welded at the left upper end of the storage box body, a push rod is fixedly connected at the left end of the auxiliary plate, and a box door is arranged at the front end of the storage box body;

wherein, the junction of depositing box and connection platform and the junction of table surface and connection platform all are provided with the fixed block that has spacing effect.

Preferably, an auxiliary block is fixedly connected to one end of the fixed block, which is close to the horizontal central axis of the storage box body, and the fixed block is fixedly connected to the movable end of a first spring with a resetting function, and the first spring is sleeved on the outer surface of a connecting rod with a T-shaped structure;

wherein, the connecting rod is fixed connection respectively in table surface and the right side of depositing the box.

Preferably, the fixed block is connected with the connecting table in a clamping manner, and forms an elastic structure between the connecting table and the connecting table through the connecting rod, and forms a sliding structure between the fixed block and the connecting rod.

Preferably, the illuminating lamp forms a lifting structure above the working table surface through a mounting rod, a sliding structure is formed between the mounting rod and a connecting block, a connecting bolt with a fixing effect is connected to the left end of the connecting block through threads, and the connecting bolt is inserted into a fixing hole at a corresponding position;

wherein, the fixed orifices equidistant setting is in the left side of installation pole.

Preferably, the placing plate is slidably connected in a connecting plate with a concave structure, placing cylinders for accommodating are fixedly connected below the left side and the right side of the placing plate, and an adjusting mechanism is arranged in the middle of the connecting plate;

wherein, the connecting plate symmetry sets up the left and right sides both ends at the board of placing.

Preferably, the adjusting mechanism comprises an adjusting plate in a horizontal state, an adjusting rod penetrating through the middle of the adjusting plate, an adjusting block with a fixing function, a fixing rod fixedly connected to one end of the adjusting plate, which is close to the vertical central axis of the placing plate, and a buffer spring sleeved on the outer surface of the fixing rod;

the movable end of the buffer spring is fixedly connected with the connecting plate.

Preferably, the adjusting plate is connected with the adjusting block in a rotating mode, the adjusting block is connected with the adjusting rod in a U-shaped structure in a threaded mode, and the adjusting rod is fixedly connected to the inner side walls at the left end and the right end of the storage box body.

Preferably, the upper end and the fixed column fixed connection of spacing post, and the equal fixedly connected with in front and back both ends of fixed column have spacing effect to spliced pole through-connection is at the front and back both ends of placing the board, be provided with between the monomer of fixed column left and right sides and have elastic spacing rope.

Preferably, the spacing post is close to the one end of placing the board perpendicular axis equidistant and is provided with the installation piece, and the downside of installation piece agrees with the downside of movable block to the movable block constitutes elastic structure at the lower extreme of placing the board.

Compared with the prior art, the invention has the beneficial effects that: this electric power maintenance overhauls with instrument self-positioning's maintenance tool car, in the in-service use, through setting up of placing a section of thick bamboo, stop gear and spacing rope, be convenient for carry out the location to maintenance instrument and maintenance equipment in the in-process of depositing it, prevent to drop and lead to damaging in the depositing process, and through setting up of adjustment mechanism, can be to placing the board and deposit the inside height of box, be convenient for deposit according to the size of instrument and equipment in a class, constitute sliding construction between connecting plate and the dead lever simultaneously, can play the effect of buffering to placing the instrument and the equipment on the board in the in-process of removal, the practicality is high, and through the setting of light, and the light can go up and down in table top through the installation pole, adjust the height of light, be convenient for reach more convenient result of use at night and under the condition that light is not good, and the telescopic connection of connecting table is on table top and depositing the box, be convenient for deposit the connecting table after the end of use, reduce occupation space, it is very convenient to use;

1. the illuminating lamp, the connecting bolt and the mounting rod are arranged, the illuminating lamp is arranged at the upper right end of the mounting rod, the illuminating lamp slides in the middle of the connecting block, the illuminating lamp can be driven to carry out height adjustment, when the illuminating lamp is adjusted to a proper height, the connecting bolt is connected to the connecting block through rotating threads, so that the connecting bolt is inserted into a fixing hole in a corresponding position, the mounting rod can be limited, the stability of the illuminating lamp and the mounting rod is improved, the illuminating lamp is convenient to play a role in illumination at night under the condition of poor light, the use scene of a tool car is enriched, and the practicability is high;

2. the workbench is provided with the workbench surface, the connecting table and the fixing block, the connecting table is stretched according to actual conditions in the actual use process, after the connecting table is stretched rightwards, the connecting table is fixedly limited through the clamping between the fixing block and the connecting table, the using area of the workbench surface can be increased through splicing the connecting table on the right side of the workbench surface, a better using effect is achieved, meanwhile, the connecting table can be stored in the workbench surface and the storage box body after the use is finished, the occupied space of the tool car is reduced, and the use is very convenient;

3. be equipped with place the board, place a section of thick bamboo, adjustment mechanism and stop gear, through adjustment mechanism's setting, can be to placing the board and store the inside height of box and adjust, be convenient for deposit not unidimensional maintenance instrument, place the board and place a section of thick bamboo and be provided with the multiunit, be convenient for classify the instrument and deposit, the connecting plate drives simultaneously and place and constitute relative sliding structure between board and the dead lever, be convenient for take place when jolting in the removal process, play buffering protection's effect to placing the board and placing the instrument on the section of thick bamboo, and combine the effect of spacing rope, can fix a position the instrument, prevent that the instrument from taking place to fall, lead to damaging.

Drawings

FIG. 1 is a schematic view of the front cut-away structure of the present invention;

FIG. 2 is a schematic diagram of the structure of the working table and the fixed plate in the contracted state;

FIG. 3 is a schematic diagram of the front view of the connection of the placement plate, the placement barrel, the adjusting mechanism and the limiting mechanism;

FIG. 4 is a perspective view showing the opened state of the working table, the connecting table and the fixing plate;

FIG. 5 is an enlarged schematic view of the structure of FIG. 1A according to the present invention;

FIG. 6 is a schematic view of a three-dimensional structure of a connection between a placement plate, a placement cylinder and a connection plate according to the present invention;

FIG. 7 is a schematic view of a front cut-away view of the connection of the connecting rod and the fixed block of the present invention;

FIG. 8 is a schematic diagram of the front cut-away structure of the connection block, the mounting rod, the illumination lamp and the working table of the invention;

FIG. 9 is a schematic elevational view of the adjustment mechanism of the present invention;

FIG. 10 is a schematic view of the connecting plate, fixing rod and adjusting plate of the present invention in front cross section;

fig. 11 is a schematic view of a connection perspective structure of a limit post, a mounting block, a fixing post, a connecting post and a limit rope according to the present invention.

In the figure: 1. a storage box; 2. an auxiliary plate; 3. a push rod; 4. a connecting block; 5. a mounting rod; 6. a connecting bolt; 7. a fixing hole; 8. a lighting lamp; 9. a work table; 10. a connection station; 11. a fixing plate; 12. a universal wheel; 13. a vertical rod; 14. a connecting rod; 15. a first spring; 16. a fixed block; 17. an auxiliary block; 18. placing a plate; 19. placing a cylinder; 20. a connecting plate; 21. an adjusting mechanism; 2101. an adjusting plate; 2102. an adjusting rod; 2103. an adjusting block; 2104. a fixed rod; 2105. a buffer spring; 22. a limiting mechanism; 23. a limit column; 24. a mounting block; 25. a movable block; 26. a second spring; 27. fixing the column; 28. a connecting column; 29. a limit rope; 30. a box door.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-11, the present invention provides a technical solution: the utility model provides an electric power maintenance overhauls with instrument self-align's maintenance tool bogie, including depositing box 1, accessory plate 2, push rod 3, connecting block 4, installation pole 5, connecting bolt 6, fixed orifices 7, light 8, table surface 9, connecting bench 10, fixed plate 11, universal wheel 12, montant 13, connecting rod 14, first spring 15, fixed block 16, accessory block 17, place the board 18, place a section of thick bamboo 19, connecting plate 20, adjustment mechanism 21, stop gear 22, spacing post 23, installation piece 24, movable block 25, second spring 26, fixed column 27, spliced pole 28, spacing rope 29 and chamber door 30.

In the maintenance tool vehicle using the self-positioning power maintenance and repair instrument, as shown in fig. 1, 3 and 6, a horizontal placing plate 18 is arranged in a storage box 1, the placing plate 18 is slidably connected to the middle part of a connecting plate 20 with a concave structure, an adjusting mechanism 21 is arranged in the middle part of the connecting plate 20, and the adjusting mechanism 21 comprises an adjusting plate 2101 in a horizontal state, an adjusting rod 2102 penetrating through the middle part of the adjusting plate 2101, an adjusting block 2103 with a fixing function, a fixing rod 2104 fixedly connected to one end, close to the vertical central axis of the placing plate 18, of the adjusting plate 2101 and a buffer spring 2105 sleeved on the outer surface of the fixing rod 2104;

according to the size of the actual maintenance tools and equipment, as shown in fig. 9 and 10, the adjusting block 2103 is connected to the outer surface of the adjusting rod 2102 with a U-shaped structure through rotating threads, the adjusting block 2103 and the adjusting plate 2101 rotate, so that the adjusting plate 2101 drives the placing plate 18 to adjust the height of the inside of the storage box body 1, the space between the single placing plates 18 can be adjusted, tools with different sizes can be conveniently stored in a classified manner, part of the tools can be placed in the placing cylinder 19, some larger tools can be placed on the upper surface of the middle part of the placing plate 18, a limiting mechanism 22 is arranged in the middle part of the placing plate 18, and as shown in fig. 2 and 11, the limiting mechanism 22 comprises a limiting post 23 inserted in the middle part of the placing plate 18 in a horizontal state, a mounting block 24 fixedly connected to the limiting post 23 near one vertical central axis of the placing plate 18, a movable block 25 with a limiting function and a second spring 26 fixedly connected to the movable block 25, and the limiting mechanism 22 is symmetrically arranged on the left side and the right side of the placing plate 18;

after the equipment is placed at the upper end of the placement plate 18, the connecting column 28 and the limiting column 23 are respectively inserted into holes at corresponding positions on the placement plate 18 by the handheld fixing column 27, the mounting blocks 24 with limiting effect are arranged at the end, close to the vertical central axis of the placement plate 18, of the limiting column 23 at equal intervals, the lower side surfaces of the mounting blocks 24 are matched with the upper side surfaces of the movable blocks 25, the movable blocks 25 form an elastic structure on the placement plate 18, when the limiting column 23 drives the mounting blocks 24 to move downwards, the mounting blocks 24 squeeze the movable blocks 25, the movable blocks 25 slide on the placement plate 18, the movable blocks 25 squeeze the second springs 26, so that the second springs 26 elastically deform, and when the elastic limiting ropes 29 contact and fix the equipment on the placement plate 18, the second springs 26 recover the elastic deformation, so that the mounting blocks 24 are clamped with the mounting blocks 24 at the corresponding positions, and limit the limiting columns 23 and the fixing columns 27 are limited, so that the handheld fixing device is simple in structure and very convenient to use;

after the box door 30 shown in fig. 2 can be closed after the box is fixed, the left end of the storage box body 1 is welded with the auxiliary plate 2, the left end of the auxiliary plate 2 is fixedly connected with the push rod 3, universal wheels 12 are arranged at the lower ends of the storage box body 1 and the fixed plate 11, the storage box body 1 is pushed by the hand-held push rod 3, the tool car is moved to a corresponding maintenance and overhaul place through the universal wheels 12, meanwhile, when jolting occurs on an uneven road surface in the pushing process, as shown in fig. 3 and 10, the placing plate 18 relatively slides between the connecting plate 20 and the fixed rod 2104, the buffer spring 2105 is extruded by the connecting plate 20, so that the buffer spring 2105 is elastically deformed, and the functions of buffering and protecting tools and equipment on the placing plate 18 and the placing cylinder 19 can be achieved;

when reaching corresponding maintenance and repair points, the universal wheels 12 are locked, as shown in fig. 1, 4, 5 and 7, the auxiliary block 17 is pulled to drive the fixing block 16 with an L-shaped structure to move, the fixing block 16 slides between the fixing block 16 and the connecting rod 14 with a T-shaped structure, the fixing block 16 extrudes the first spring 15, so that the first spring 15 is elastically deformed, the fixing block 16 is separated from the fixing plate 11, then the fixing plate 11 is pulled rightwards, the fixing plate 11 drives the connecting table 10 to move rightwards, the connecting table 10 slides on the workbench 9 and the storage box body 1 respectively, the vertical rod 13 with a supporting function is arranged in the middle of the fixing plate 11, after the connecting table 10 slides out of the workbench 9 and the storage box body 1, the auxiliary block 17 is loosened, the first spring 15 recovers elastic deformation to drive the fixing block 16 to be clamped with the connecting table 10, the connecting table 10 is limited, the use area and the operation area of the workbench 9 can be increased through the arrangement of the connecting table 10, and the practicability of the tool car is improved;

then the box door 30 is opened, the movable block 25 is separated from the mounting block 24 by pulling the movable block 25, then the fixed column 27 is pulled, the connecting column 28 and the limiting column 23 are detached from the placing plate 18, the limiting rope 29 is loosened to limit the overhaul equipment, the placing plate 18 can be directly slid out of the connecting plate 20, the placing plate 18 is taken out from the storage box body 1, tools in the placing barrel 19 are taken out, the tools and the equipment are placed on the working table 9 and the connecting table 10, and maintenance, detection and repair are carried out on the electric power system;

in addition, in the maintenance and overhaul process, when the lamp 8 is used for lighting at night or under the condition of poor light, the more convenient operation effect is achieved, the lighting height of the lamp 8 can be adjusted according to the actual situation, as shown in fig. 1 and 8, the connecting bolt 6 which is connected to the left end of the connecting block 4 through threads is rotated, so that the connecting bolt 6 is separated from the fixing hole 7, the fixing hole 7 is arranged at the left side of the mounting rod 5 at equal intervals, the lamp 8 can be driven to lift above the workbench 9 through sliding between the mounting rod 5 and the connecting block 4, the lighting height of the workbench 9 is adjusted, and when the lighting height is adjusted to a proper height, the connecting bolt 6 is inserted into the fixing hole 7 at the corresponding position through reverse rotation threads, so that the mounting rod 5 and the lamp 8 are limited, and the stability of the lamp 8 in the use process is enhanced;

after maintenance and overhaul are completed, tools and equipment are placed on the placing plates 18 and the placing cylinders 19 at corresponding positions in a classified mode, the connecting table 10 can slide leftwards, the connecting table 10 is stored, the occupied space of a tool car is reduced, and the tool car is very convenient to use.

The details not described in detail in the specification belong to the prior art known to those skilled in the art, standard parts used in the invention can be purchased from market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the description is omitted.

Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.

Claims (7)

1. An electric power maintenance overhauls with instrument self-align's maintenance tool car, characterized in that includes:

the storage box body (1), the upper end of the storage box body (1) is fixedly connected with a workbench surface (9) in a horizontal state, the left end of the workbench surface (9) is fixedly connected with a connecting block (4), the middle part of the connecting block (4) is inserted with an installation rod (5) in a vertical state, and the right upper end of the installation rod (5) is provided with an illuminating lamp (8);

the connecting tables (10) are connected with the fixing plate (11) at the right end of the connecting tables (10), 2 single bodies of the connecting tables (10) are arranged, and the connecting tables (10) are respectively connected with the middle part of the working table surface (9) and the middle part of the lower end of the storage box body (1) in a telescopic manner;

wherein, the middle part of the fixed plate (11) is fixedly connected with a vertical rod (13) with supporting function; the lower ends of the fixing plate (11) and the storage box body (1) are provided with universal wheels (12);

the limiting mechanism (22) comprises a limiting column (23) inserted in the middle of the placing plate (18) in a horizontal state, a mounting block (24) fixedly connected to one end, close to the vertical central axis of the placing plate (18), of the limiting column (23), a movable block (25) with a limiting effect and a second spring (26) fixedly connected to the movable block (25);

wherein the limiting mechanisms (22) are symmetrically arranged at the left side and the right side of the placing plate (18);

the placing plate (18) is slidably connected in a connecting plate (20) with a concave structure, placing cylinders (19) for accommodating are fixedly connected below the left side and the right side of the placing plate (18), and an adjusting mechanism (21) is arranged in the middle of the connecting plate (20);

wherein the connecting plates (20) are symmetrically arranged at the left end and the right end of the placing plate (18);

the adjusting mechanism (21) comprises an adjusting plate (2101) in a horizontal state, an adjusting rod (2102) penetrating through the middle of the adjusting plate (2101), an adjusting block (2103) with a fixing function, a fixing rod (2104) fixedly connected to one end, close to the vertical central axis of the placing plate (18), of the adjusting plate (2101) and a buffer spring (2105) sleeved on the outer surface of the fixing rod (2104); wherein the movable end of the buffer spring (2105) is fixedly connected with the connecting plate (20);

the adjusting plate (2101) is connected with the adjusting block (2103) in a rotating mode, the adjusting block (2103) is connected with the adjusting rod (2102) in a U-shaped structure in a threaded mode, and the adjusting rod (2102) is fixedly connected to the inner side walls of the left end and the right end of the storage box body (1).

2. The self-positioning service tool cart for electric power maintenance service equipment according to claim 1, wherein: an auxiliary plate (2) is welded at the left upper end of the storage box body (1), a push rod (3) is fixedly connected at the left end of the auxiliary plate (2), and a box door (30) is arranged at the front end of the storage box body (1);

wherein, the junction of depositing box (1) and connection platform (10) and the junction of table surface (9) and connection platform (10) all are provided with fixed block (16) that have spacing effect.

3. The self-positioning service tool cart for electric power maintenance service equipment according to claim 2, wherein: an auxiliary block (17) is fixedly connected to one end of the fixed block (16) close to the horizontal central axis of the storage box body (1), the fixed block (16) is fixedly connected to the movable end of a first spring (15) with a resetting effect, and the first spring (15) is sleeved on the outer surface of a connecting rod (14) with a T-shaped structure;

the connecting rod (14) is fixedly connected to the right sides of the workbench surface (9) and the storage box body (1) respectively.

4. A self-positioning service tool car for electric power maintenance service equipment according to claim 3, wherein: the fixed block (16) is connected with the connecting table (10) in a clamping manner, an elastic structure is formed between the fixed block (16) and the connecting table (10) through the connecting rod (14), and a sliding structure is formed between the fixed block (16) and the connecting rod (14).

5. The self-positioning service tool cart for electric power maintenance service equipment according to claim 1, wherein: the illuminating lamp (8) forms a lifting structure above the working table surface (9) through the mounting rod (5), a sliding structure is formed between the mounting rod (5) and the connecting block (4), the left end of the connecting block (4) is connected with a connecting bolt (6) with a fixing effect in a threaded manner, and the connecting bolt (6) is inserted into a fixing hole (7) at a corresponding position;

wherein the fixing holes (7) are arranged on the left side of the mounting rod (5) at equal intervals.

6. The self-positioning service tool cart for electric power maintenance service equipment according to claim 1, wherein: the upper end of spacing post (23) and fixed column (27) fixed connection, and all fixedly connected with at both ends around fixed column (27) have spliced pole (28) of spacing effect to spliced pole (28) through-connection is at both ends around placing board (18), be provided with between the monomer of fixed column (27) both sides and have elastic spacing rope (29).

7. The self-positioning service tool cart for electric power maintenance service equipment according to claim 6, wherein: the limiting columns (23) are arranged at one end, close to the vertical central axis of the placing plate (18), of the limiting columns at equal intervals, the lower side faces of the mounting blocks (24) are matched with the upper side faces of the movable blocks (25), and the movable blocks (25) form an elastic structure at the lower end of the placing plate (18).

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