CN216030011U

CN216030011U - Robot polishing workstation of polishing

Info

Publication number: CN216030011U
Application number: CN202122174940.0U
Authority: CN
Inventors: 张胜忠; 张华伟
Original assignee: Dongguan Kemeng Mechanical Equipment Engineering Co ltd
Current assignee: Dongguan Kemeng Mechanical Equipment Engineering Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-03-15
Anticipated expiration: 2031-09-09

Abstract

The utility model discloses a robot polishing and grinding workstation which comprises a rack, wherein a six-shaft mechanical arm body is arranged on one side of the rack, a grinding mechanism is arranged at one end of the six-shaft mechanical arm body, the grinding mechanism comprises a driving shaft arranged at one end of the six-shaft mechanical arm body, and a fixing block is fixedly connected to one end of the driving shaft. Compared with the prior art, the automatic dust-settling device has the advantages that the old grinding disc automatically falls off after being used for grinding, the new grinding disc can be automatically replaced, the labor intensity can be reduced for manual replacement, the efficiency of overall workpiece grinding can be improved, the atomized water is sprayed outwards to the workpiece to be ground through the atomizer, dust generated by grinding can be settled and settled through water mist, the surface of the workpiece can be cooled, the friction force between the first clamping block and the second clamping block and the grinding disc can be improved through the rubber block, and the phenomenon that when the grinding disc is clamped and detached, the grinding disc and the clamping blocks slide to affect replacement of the grinding disc can be avoided.

Description

Robot polishing workstation of polishing

Technical Field

The utility model relates to the technical field of polishing equipment, in particular to a robot polishing and polishing workstation.

Background

Along with market economy's rapid development, automation equipment is more and more popular, people like to pursue more and can bring convenient device for our life and work, current notebook shell has become the indispensable article in people daily life and the work, and the shell of notebook adopts the plastics material to make through injection molding machine an organic whole greatly, at this in-process of moulding plastics, the plastics shell still need process of polishing can final product, need use the abrasive disc of several kinds of different specifications to polish when polishing at present, however when polishing after changing these abrasive discs, it changes one by one to use the manual work usually, not only intensity of labour is great but also change efficiency not high, influence whole speed of polishing.

Through retrieval, the Chinese patent with publication number CN207309633U discloses a polishing device for a notebook shell, which comprises a workbench, wherein a polishing mechanical arm, a feeding and discharging conveying mechanism, a positioning polishing track and an automatic sand paper replacing device are arranged on the workbench; the feeding and discharging mechanical arm is arranged above the feeding and discharging conveying mechanism and used for picking up the non-polished and polished notebook computer shells; the polishing manipulator is arranged above the positioning polishing track and used for polishing the notebook shell placed on the positioning polishing track; the automatic sand paper replacing device is arranged on the side face of the positioning polishing track and used for replacing sand paper feeding and sand paper. The full-automatic polishing device improves the production efficiency, improves the precision of product processing, is more accurate in full-automatic picking and placing positions, improves the product yield by automatic polishing, and ensures the product quality.

In the above-mentioned patent, the equipment device of polishing of notebook shell has following not enough: when the grinding plates are replaced after being polished, the grinding plates are replaced one by manpower, so that the labor intensity is high, and the replacement efficiency is not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a robot polishing and grinding workstation.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a robot polishing and grinding workstation comprises a rack, wherein one side of the rack is provided with a six-axis mechanical arm body, one end of the six-axis mechanical arm body is provided with a grinding mechanism, the grinding mechanism comprises a driving shaft arranged at one end of the six-axis mechanical arm body, one end of the driving shaft is fixedly connected with a fixed block, the outside of the fixed block is provided with at least three supporting rods, one end of each supporting rod is fixedly connected with a female magic tape, the outside of each female magic tape is provided with a male magic tape, the outside of one side of each male magic tape is fixedly provided with a grinding sheet, the top of the rack is provided with a cooling mechanism, a plurality of workpieces are arranged in the cooling mechanism, the outside of one side of the rack is fixedly connected with a fixed frame, the top of the fixed frame is provided with a grinding sheet tearing mechanism, the grinding sheet tearing mechanism comprises a first air cylinder fixedly connected with the top of the fixed frame, one end of the first air cylinder is provided with a first driving rod, the grinding mechanism comprises a first clamping block, a second clamping block, a fixing frame, a grinding disc storage bin, a first driving rod, a second cylinder, a second driving rod and a second driving rod, wherein the first clamping block is fixedly connected with the outside of one end of the first driving rod, the second clamping block is arranged on one side of the first clamping block, the bottom of the second clamping block is fixedly connected with the top of the fixing frame, three groups of grinding disc replacement mechanisms are arranged on one side of the fixing frame, each group of grinding disc replacement mechanisms comprises a grinding disc storage bin fixedly connected with the top of the fixing frame, a circular groove is formed in the grinding disc storage bin, the second cylinder is arranged inside the fixing frame, the top of the second cylinder is provided with the second driving rod, and one end of the second driving rod penetrates through the fixing frame and the grinding disc storage bin.

Further, cooling body includes water collection bin, water collection bin bottom and frame top fixed connection, the inside first cavity of having seted up in water collection bin, frame top inner wall fixedly connected with has the cold water storage cistern.

Further, the outside fixedly connected with drinking-water pipe of cold water storage cistern one side, the outside fixedly connected with water pump of drinking-water pipe one end, the water pump top is equipped with the outlet pipe, outlet pipe one end runs through frame water and collects the storehouse and is linked together with first cavity.

Furthermore, the water collecting bin is provided with a first through hole outside the first cavity, and an atomizer is arranged inside the first through hole.

Furthermore, a rectangular through hole is formed in the top of the fixing frame, a waste bin is arranged at the bottom of the rectangular through hole, the bottom of the waste bin is fixedly connected with the fixing frame, and a plurality of universal wheels are arranged at the bottom of the rack.

Furthermore, rubber blocks are arranged outside one side of the first clamping block and one side of the second clamping block.

The utility model has the beneficial effects that:

1. by arranging the abrasive disc tearing mechanism and the abrasive disc replacing mechanism, firstly, an external power supply is closed to start the six-axis mechanical arm body, a corresponding instruction program is input into a mechanical arm control panel, then the six-axis mechanical arm body receives a corresponding instruction signal, so that a servo motor in the six-axis mechanical arm controls the abrasive disc tearing mechanism which is moved by the polishing mechanism, at the moment, the six-axis mechanical arm body drives any abrasive disc of the polishing mechanism to be positioned between the first clamping block and the second clamping block, because the instruction program input into the mechanical arm control panel transmits the signal to the first air cylinder when the six-axis mechanical arm body is positioned on the abrasive disc tearing mechanism, at the moment, the first air cylinder receives the signal to drive the first driving rod to drive the first clamping block to move towards the left side, so that the abrasive disc can be clamped between the first clamping block and the second clamping block, when the six-axis mechanical arm body moves to drive the supporting rod to move, the device can separate the old abrasive disc from the supporting rod, simultaneously, the drive shaft is controlled to rotate up and down and left and right to sequentially place the abrasive disc on the polishing mechanism between the first clamping block and the second clamping block, the six-axis mechanical arm body is moved to sequentially separate the old abrasive disc from the supporting rod, the mechanical arm control panel controls the six-axis mechanical arm body to drive the polishing mechanism to move above the abrasive disc changing mechanism, a corresponding instruction program in the control panel can control the second cylinder to drive the second driving rod to move upwards, the second driving rod which moves upwards can drive the new abrasive disc placed in the abrasive disc containing bin to move upwards, the drive shaft is controlled to rotate up and down and left and right to sequentially place the magic tape at the bottom of the abrasive disc on the polishing mechanism downwards, the adhesion between the magic tape and the magic tape is utilized at the moment, the new abrasive disc can be fixed on the supporting rod, the device sequentially and automatically drops the old abrasive disc after being polished, the grinding disc can be automatically replaced, so that the labor intensity of manual replacement can be reduced, the labor force can be reduced, and the efficiency of integrally grinding the workpiece can be improved;

2. by arranging the atomizer, water in the cold water tank is pumped to the water outlet pipe through the water pump and enters the first cavity, and mist water liquid is sprayed out to the polished workpiece through the atomizer, so that dust generated by polishing can be settled and reduced, the surface of the workpiece can be cooled, and the workpiece is prevented from being deformed easily due to the temperature generated by friction;

3. through setting up the block rubber, utilize and all install the block rubber in first clamp splice and second clamp splice one side, utilize the block rubber can improve the frictional force between first clamp splice and second clamp splice and the abrasive disc, can avoid when the abrasive disc that the centre gripping was lifted off, slide between abrasive disc and the clamp splice to influence the change of abrasive disc.

Drawings

Fig. 1 is a front view of a robotic polishing and grinding station as set forth in embodiment 1;

FIG. 2 is a front view of a robot polishing and grinding station according to embodiment 1;

FIG. 3 is a partial front view of a strut of a robotic buffing station as set forth in example 1;

FIG. 4 is a front view of a water collecting chamber of a robotic polishing and grinding station as set forth in example 1;

fig. 5 is a front view of a rubber block of a robot polishing and grinding workstation in embodiment 2.

In the figure: 1-rack, 2-cooling mechanism, 21-water collecting bin, 22-water pump, 23-water pumping pipe, 24-cold water tank, 25-atomizer, 26-water outlet pipe, 3-workpiece, 4-six-shaft mechanical arm body, 5-polishing mechanism, 51-driving shaft, 52-fixed block, 53-supporting rod, 54-grinding sheet, 55-mother magic tape, 56-child magic tape, 6-fixed frame, 7-grinding sheet tearing mechanism, 71-first cylinder, 72-rectangular through hole, 73-first driving rod, 74-first clamping block, 75-second clamping block, 76-water collecting bin, 8-grinding sheet replacing mechanism, 81-second cylinder, 82-grinding sheet containing bin, 83-second driving rod, 9-universal wheel, water pump, 24-cold water tank, 25-atomizer, 26-water outlet pipe, 3-workpiece, 4-six-shaft mechanical arm body, 5-grinding mechanism, 51-first cylinder, 72-rectangular through hole, 73-first driving rod, 74-first clamping block, 75-second clamping block, 76-water collecting bin, 8-universal wheel, 81-second cylinder, 82-grinding sheet containing bin, 83-second driving rod, 9-universal wheel, and water pump, 10-rubber block.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Example 1

Referring to fig. 1-4, a robot polishing and grinding workstation, includes a frame 1, one side of the frame 1 is provided with an ER20-C10 type six-axis mechanical arm body 4, one end of the ER20-C10 type six-axis mechanical arm body 4 is provided with a grinding mechanism 5, the grinding mechanism 5 includes a driving shaft 51 arranged at one end of the ER20-C10 type six-axis mechanical arm body 4, one end of the driving shaft 51 is fixedly connected with a fixing block 52, the outside of the fixing block 52 is provided with at least three supporting rods 53, one end of each supporting rod 53 is fixedly connected with a female magic tape 55, the outside of each female magic tape 55 is provided with a sub magic tape 56, the outside of one side of each sub magic tape 56 is fixed with a grinding disc 54, the top of the frame 1 is provided with a cooling mechanism 2, a plurality of workpieces 3 are arranged inside the cooling mechanism 2, the outside of one side of the frame 1 is fixedly connected with a fixing frame 6, the top of the fixing frame 6 is provided with a grinding sheet tearing mechanism 7, the grinding sheet tearing mechanism 7 comprises a first air cylinder 71 fixedly connected with the top end of the fixing frame 6, one end of the first air cylinder 7 is provided with a first driving rod 73, the outside of one end of the first driving rod 73 is fixedly connected with a first clamping block 74, one side of the first clamping block 74 is provided with a second clamping block 75, the bottom of the second clamping block 75 is fixedly connected with the top of the fixing frame 6, one side of the fixing frame 1 is provided with three groups of grinding sheet replacing mechanisms 8, each group of grinding sheet replacing mechanisms 8 comprises a grinding sheet containing bin 82 fixedly connected with the top of the fixing frame 6, a circular groove is formed inside the grinding sheet containing bin 82, a second air cylinder 81 is arranged inside the fixing frame 6, the top of the second air cylinder 81 is provided with a second driving rod 83, one end of the second driving rod 83 penetrates through the fixing frame 6 and the containing bin 82, and the grinding sheet tearing mechanism 7, The abrasive disc changing mechanism 8 is characterized in that an external power supply is closed firstly to start the six-axis mechanical arm body 4, a corresponding instruction program is input into a mechanical arm control panel, at the moment, the six-axis mechanical arm body 4 receives a corresponding instruction signal, so that a servo motor in the six-axis mechanical arm body 4 controls the abrasive disc tearing mechanism 7 of the grinding mechanism 5 to move, at the moment, the six-axis mechanical arm body 4 drives any one abrasive disc 54 of the grinding mechanism 5 to be positioned between the first clamping block 74 and the second clamping block 75, because the instruction program input into the mechanical arm control panel transmits a signal to the first cylinder 71 when the six-axis mechanical arm body 4 is positioned on the abrasive disc tearing mechanism 7, at the moment, the first cylinder 71 receives the signal to drive the first driving rod 73 to drive the first clamping block 74 to move towards the left side, so that the abrasive disc 54 can be clamped between the first clamping block 74 and the second clamping block 75, when the six-axis mechanical arm body 4 moves, and the supporting rod 53 is driven to move, the old abrasive disc 54 can be separated from the supporting rod 53, meanwhile, the driving shaft 51 is controlled to rotate up and down and left and right to sequentially place the abrasive disc 54 on the polishing mechanism 5 between the first clamping block 74 and the second clamping block 75, the six-axis mechanical arm body 4 is moved to sequentially separate the old abrasive disc 54 from the supporting rod 53, at the moment, the mechanical arm control panel controls the six-axis mechanical arm body 4 to drive the polishing mechanism 5 to move to the abrasive disc changing mechanism 7, and a corresponding instruction program in the control panel can control the second air cylinder 81 to drive the second driving rod 83 to move upwards, at the moment, the second driving rod 83 moving upwards can drive the new abrasive disc 54 placed in the abrasive disc accommodating bin 82 to move upwards, then the driving shaft 51 is controlled to rotate up and down and left and right to sequentially place the sub magic tape 56 at the bottom of the abrasive disc on the polishing mechanism 5 downwards, at the moment, the adhesion between the sub magic tape 56 and the female magic tape 55 is utilized, can fix new abrasive disc 54 on branch, the device sets up and will polish in proper order and use the old abrasive disc 54 of back and drop automatically to can the automatic abrasive disc of renewing, not only can reduce the manual work and change intensity of labour and reduce the labour, can also improve the efficiency of whole work piece of polishing.

Wherein, cooling body 2 includes water collection storehouse 21, water collection storehouse 21 bottom and 1 top fixed connection of frame, the inside first cavity that has seted up in water collection storehouse 21, frame 1 top inner wall fixedly connected with has cold water storage cistern 24, cold water storage cistern 24 one side outside fixedly connected with drinking-water pipe 23, drinking-water pipe 23 one end outside fixedly connected with water pump 22, water pump 22 top is equipped with outlet pipe 26, outlet pipe 26 one end runs through frame 1 water collection storehouse 21 and is linked together with first cavity, water collection storehouse 21 has seted up first through-hole outside first cavity, and the inside atomizer 25 that is equipped with of first through-hole, through setting up atomizer 25, through water pump 22 with in the cold water storage cistern 24 take out outlet pipe 26 and enter first cavity to through atomizer 25 outside vaporific water liquid of spouting on the work piece 3 that polishes, utilize not only can sink the dust fall processing with the dust that produces of polishing, the surface of the workpiece 3 can be cooled, and the workpiece is prevented from being deformed easily due to the temperature generated by friction.

Wherein, rectangle through-hole 72 has been seted up at mount 6 top, and rectangle through-hole 72 bottom is equipped with waste product storehouse 76, waste product storehouse 76 bottom and mount 6 fixed connection, after first clamp splice 74 and second clamp splice 75 pressed from both sides old abrasive disc down, permeable rectangle through-hole fell into waste product storehouse 76 to can collect the clearance with old abrasive disc 54, frame 1 bottom is equipped with a plurality of universal wheel 9, conveniently moves the position to frame 1.

The working principle is as follows: firstly, an external power supply is closed to start the six-axis mechanical arm body 4, a corresponding instruction program is input into the mechanical arm control panel, at the moment, the six-axis mechanical arm body 4 receives a corresponding instruction signal, so that a servo motor in the six-axis mechanical arm body 4 controls the grinding mechanism 5 to move on the abrasive disc tearing mechanism 7, at the moment, the six-axis mechanical arm body 4 drives the abrasive disc 54 of any one of the grinding mechanisms 5 to be positioned between the first clamping block 74 and the second clamping block 75, because the instruction program input into the mechanical arm control panel transmits a signal to the first air cylinder 71 when the six-axis mechanical arm body 4 is positioned on the abrasive disc tearing mechanism 7, at the moment, the first air cylinder 71 receives the signal to drive the first driving rod 73 to drive the first clamping block 74 to move towards the left side, so that the abrasive disc 54 can be clamped between the first clamping block 74 and the second clamping block 75, when the six-axis mechanical arm body 4 moves to drive the supporting rod 53 to move, the old abrasive disc 54 can be separated from the supporting rod 53, meanwhile, the driving shaft 51 is controlled to rotate up and down and left and right to sequentially place the abrasive disc 54 on the polishing mechanism 5 between the first clamping block 74 and the second clamping block 75, the six-axis mechanical arm body 4 is moved to sequentially separate the old abrasive disc 54 from the supporting rod 53, at the moment, the mechanical arm control panel controls the six-axis mechanical arm body 4 to drive the polishing mechanism 5 to move to the abrasive disc changing mechanism 7, and a corresponding instruction program in the control panel can control the second air cylinder 81 to drive the second driving rod 83 to move upwards, at the moment, the second driving rod 83 moving upwards can drive the new abrasive disc 54 placed in the abrasive disc accommodating bin 82 to move upwards, then the driving shaft 51 is controlled to rotate up and down and left and right to sequentially place the sub magic tape 56 at the bottom of the abrasive disc on the polishing mechanism 5 downwards, at the moment, the adhesion between the sub magic tape 56 and the female magic tape 55 is utilized, can fix new abrasive disc 54 on branch, the device sets up and will polish in proper order and use the old abrasive disc 54 of back and drop automatically to can the automatic abrasive disc of renewing, not only can reduce the manual work and change intensity of labour and reduce the labour, can also improve the efficiency of whole work piece of polishing.

Through setting up atomizer 25, take out outlet pipe 26 and enter into first cavity through the water in water pump 22 with cold water tank 24, and on outwards spouting vaporific water liquid to the work piece 3 of polishing through atomizer 25, utilize water smoke not only can sink the dust fall processing with the dust that produces of polishing, can also carry out the cooling action to work piece 3 surface, the temperature of avoiding the friction production makes the work piece take place deformation easily, after first clamp splice 74 and second clamp splice 75 pressed from both sides old abrasive disc down, permeable rectangle through-hole falls into waste product storehouse 76, thereby can collect the clearance with old abrasive disc 54.

Example 2

Referring to fig. 5, compared with embodiment 1, in order to increase the friction force between the grinding sheet 54 and the clamping blocks, in this embodiment, the rubber blocks 10 are arranged outside one side of each of the first clamping block 74 and the second clamping block 75, and by arranging the rubber blocks 10, the rubber blocks 10 are arranged on one side of each of the first clamping block 74 and the second clamping block 75, so that the friction force between the first clamping block 74 and the grinding sheet 54 and between the second clamping block 75 and the grinding sheet 54 can be increased by using the rubber blocks 10, and the grinding sheet 54 and the clamping blocks can be prevented from sliding when clamping the detached grinding sheet, thereby affecting the replacement of the grinding sheet.

By arranging the rubber block 10 and installing the rubber block 10 on one side of the first clamping block 74 and one side of the second clamping block 75, the friction force between the first clamping block 74 and the second clamping block 75 and the abrasive disc 54 can be improved by the rubber block 10, and the abrasive disc 54 and the clamping blocks can be prevented from sliding when the detached abrasive disc is clamped, so that the replacement of the abrasive disc is influenced.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides a robot polishing workstation of polishing, includes frame (1), its characterized in that, frame (1) one side is equipped with six arm bodies (4), six arm bodies (4) one end is equipped with grinding machanism (5), grinding machanism (5) include drive shaft (51) that set up in six arm bodies (4) one end, drive shaft (51) one end fixedly connected with fixed block (52), fixed block (52) outside is equipped with at least three branch (53), every branch (53) one end all fixedly connected with female magic subsides (55), every female magic subsides (55) outside all is equipped with sub magic subsides (56), every sub magic subsides (56) one side outside is fixed with abrasive disc (54), frame (1) top is equipped with cooling mechanism (2), and cooling mechanism (2) inside is equipped with a plurality of work piece (3), the grinding sheet tearing mechanism (7) is arranged at the top of the fixing frame (6), the grinding sheet tearing mechanism (7) comprises a first air cylinder (71) fixedly connected with the top end of the fixing frame (6), a first driving rod (73) is arranged at one end of the first air cylinder (71), a first clamping block (74) is fixedly connected with the outer portion of one end of the first driving rod (73), a second clamping block (75) is arranged on one side of the first clamping block (74), the bottom of the second clamping block (75) is fixedly connected with the top of the fixing frame (6), three sets of grinding sheet replacing mechanisms (8) are arranged on one side of the fixing frame (6), each set of grinding sheet replacing mechanisms (8) comprises a storage grinding sheet bin (82) fixedly connected with the top of the fixing frame (6), and a circular groove is formed in the storage grinding sheet bin (82), the grinding wheel is characterized in that a second cylinder (81) is arranged inside the fixing frame (6), a second driving rod (83) is arranged at the top of the second cylinder (81), and one end of the second driving rod (83) penetrates through the fixing frame (6) and the grinding plate storage bin (82).

2. The robot polishing and grinding workstation according to claim 1, characterized in that the cooling mechanism (2) comprises a water collection bin (21), the bottom of the water collection bin (21) is fixedly connected with the top of the frame (1), a first cavity is formed in the water collection bin (21), and a cold water tank (24) is fixedly connected to the inner wall of the top of the frame (1).

3. The robot polishing and grinding workstation according to claim 2, characterized in that a water pumping pipe (23) is fixedly connected to the outside of one side of the cold water tank (24), a water pump (22) is fixedly connected to the outside of one end of the water pumping pipe (23), a water outlet pipe (26) is arranged at the top of the water pump (22), and one end of the water outlet pipe (26) penetrates through the water collecting bin (21) of the rack (1) and is communicated with the first cavity.

4. A robot polishing and sanding station as in claim 3, wherein the water collection compartment (21) is provided with a first through hole outside the first cavity and inside which an atomizer (25) is provided.

5. The robot polishing and grinding workstation according to claim 4, characterized in that a rectangular through hole (72) is formed at the top of the fixing frame (6), a waste bin (76) is arranged at the bottom of the rectangular through hole (72), the bottom of the waste bin (76) is fixedly connected with the fixing frame (6), and a plurality of universal wheels (9) are arranged at the bottom of the machine frame (1).

6. A robotic polishing and sanding station as in claim 5, characterized in that the first block (74) and the second block (75) are provided with a rubber block (10) on one side and outside.