CN111776965A

CN111776965A - Electric block for mine hole

Info

Publication number: CN111776965A
Application number: CN202010533225.9A
Authority: CN
Inventors: 林晔; 林杨波
Original assignee: Taizhou Boneng Hoisting Machinery Co ltd
Current assignee: Zhejiang Zhongqi Hoisting Technology Co ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2020-10-16
Anticipated expiration: 2040-06-12
Also published as: CN111776965B

Abstract

The invention discloses an electric hoist for a mine tunnel, which relates to the technical field of hoisting devices, and the technical scheme is characterized in that: the novel waxing machine comprises a housing, driving motor, reduction gear group, the sprocket, the chain ring, the lifting hook, the chain ring bag, the casing is equipped with the air feed chamber, air passage, check valve one, high-pressure draught generating device is installed to the air feed intracavity, high-pressure draught generating device includes the cam, the push pedal, check valve two, the pressure limiting valve, the cam is equipped with the slider, the push pedal is equipped with the push rod, the casing is equipped with the pulse valve, air passage includes main entrance and branch way, the casing is equipped with the filter mantle, the casing is equipped with the buffering gasbag, the intercommunication pipeline, the buffering gasbag is equipped with the gas blow pipe, the air gun. Through the arrangement of the high-pressure airflow generating device and the pulse valve, dust is not easy to enter the electric hoist; the electric hoist is not easy to be damaged by impact by arranging the buffering air bag; by arranging the waxing device, the surface of the chain ring is not easy to rust and adhere dust.

Description

Electric block for mine hole

Technical Field

The invention relates to the technical field of hoisting devices, in particular to an electric hoist for a mine hole.

Background

The electric hoist is a special hoisting device, is installed on a crown block and a gantry crane, has the characteristics of small volume, light dead weight, simple operation, convenient use and the like, and is used in places such as industrial and mining enterprises, storage, docks and the like. The electric block is mainly divided into: the system comprises a ring chain electric hoist, a steel wire rope electric hoist, an anti-corrosion electric hoist, a double-drum electric hoist, a winch, a miniature electric hoist, a group-hanging electric hoist and a multifunctional hoister.

The Chinese patent with the prior application publication number of CN110902592A discloses an electric chain block, which comprises a box body, a partition plate, a second speed reducing wheel, an installation through hole, an internal thread pipe, a second rotating shaft and a chain wheel fixed on the outer peripheral surface of the second rotating shaft; the peripheral surface of the chain wheel is sleeved with a transmission chain, and a fixed cylinder is fixed at the end part of the transmission chain; a driving device for driving the box body to move along the axial direction of the supporting rod is arranged in the box body; a braking device for preventing the rotation of the internal thread pipe is arranged between the internal thread pipe and the fixed column body; a square through hole is formed in one side, close to the internal threaded pipe, of the second speed reducing wheel, and a square shaft is arranged in the square through hole in a sliding mode along the axial direction of the second speed reducing wheel; a first threaded shaft is fixed at one end of the square shaft close to the internal threaded pipe and is in threaded connection with the internal threaded pipe.

The above prior art solutions have the following drawbacks: because the environment in mine hole is comparatively abominable, the dust is more, and the dust is easily attached to on the chain link, is gone into inside the chain electric block by the drive chain belt, and the dust is gathered in the inside running clearance that easily gets into the second pivot of chain block, hinders to rotate it and makes it rotate unstability and influence the normal operating of calabash, and the corrosion of chain link can be accelerated to inorganic salt in the dust in addition.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the electric hoist for the mine hole, which can remove dust on the chain ring, so that the dust is not easy to be brought into the electric hoist by the chain ring to influence the normal operation of the electric hoist.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides an electric block for mine opening, includes casing, driving motor, reduction gear group, sprocket, chain link, lifting hook, chain link bag, driving motor, reduction gear group, sprocket all are located the casing, the chain link activity is inlayed on the chain link, the casing is equipped with the perforation that supplies the chain link to wear out and the inlet hole that supplies the chain link to penetrate, chain link bag sack circumference edge and shell surface fixed connection will advance the hole and seal with the external world, the casing is equipped with air feed chamber, the air passage, the check valve one with air feed chamber intercommunication, the air feed chamber passes through check valve one and communicates with the external world, the air feed intracavity is installed and is provided the high pressure draught generating device of compressed air for air passage, air passage and fenestrate pore wall intercommunication, air passage's port is towards the chain link.

Through adopting above-mentioned technical scheme, chain link bag sack circumference edge and casing surface fixed connection and will advance the hole and seal with the external world, make the chain link that is located the chain link bag not expose in the air and be infected with the dust, in the air accessible check valve one of external world gets into the air feed chamber, process the compression by high-pressure airflow generating device, make it become high-pressure gas, back pass through air passage, blow to the chain link, blow away from the chain link with the dust on the chain link, make in the dust is difficult for moving this electric block of entering through the chain link bag, keep the inside cleanness of this electric block, make it can normal operating.

The present invention in a preferred example may be further configured to: the high-pressure airflow generating device comprises a cam, a push plate, a second one-way valve and a pressure limiting valve which are sequentially arranged, the cam is driven by a driving motor to rotate, the push plate is connected with an air supply cavity in a sliding mode, the circumferential side wall of the push plate is attached to the wall of the air supply cavity, the cam is provided with a sliding block which slides along the circumferential direction of the cam, the sliding block cannot be separated from the cam, a push rod is fixedly arranged on the push plate, the axial direction of the push rod is along the sliding direction of the push plate, the end portion of the push rod is connected with the sliding block, the first one-way valve is located between the push plate and the second one-way valve, the second one-way valve and the pressure limiting valve.

By adopting the technical scheme, when the driving motor rotates, the cam is driven to rotate, the sliding block is connected with the cam in a sliding mode, the cam moves through the push rod, the sliding block is limited by the push rod and only can do repeated variable speed movement along the sliding direction of the push plate, air between the push plate and the second one-way valve is compressed, the compressed air enters the air pressure chamber through the second one-way valve, when the pressure of the air pressure chamber exceeds the upper limit of the pressure limiting valve, compressed air flow can be discharged to the air channel from the pressure limiting valve, and is blown to the chain ring through the air channel, and dust on the chain ring is cleaned.

The present invention in a preferred example may be further configured to: the shell is provided with a pulse valve which is communicated with the air channel and divides the air channel into two parts which are communicated with each other.

By adopting the technical scheme, the pulse valve can change the input high-pressure continuous airflow into short impact airflow, and the impact airflow is input into the air channel, so that the cleaning effect of the output airflow on the chain ring is better.

The present invention in a preferred example may be further configured to: the cross section of the through hole is in a cross shape, the air channel comprises a main channel and a plurality of branch channels, and the ports of the branch channels are arranged at intervals along the circumferential direction of the through hole.

Through adopting above-mentioned technical scheme, fenestrate shape is corresponding with the chain link, and the chain link of being convenient for passes the perforation smoothly, and the port of a plurality of branchs sets up along fenestrate circumference interval, and the setting up of a plurality of branchs makes air channel can blow to the ring limit of chain link in the perforation from a plurality of angles, improves its clean effect.

The present invention in a preferred example may be further configured to: the ends of a plurality of said branches are each disposed obliquely towards the perforated outer orifice.

By adopting the technical scheme, the branch channel is obliquely arranged, so that dust on the chain ring can be blown out to the outside from the through hole opening, and the dust is not easy to splash and enter the shell in the process of being blown away by gas.

The present invention in a preferred example may be further configured to: the shell is provided with a filter cover used for filtering air, and the first check valve is communicated with the inner space of the filter cover.

Through adopting above-mentioned technical scheme, the setting of filter mantle can prevent that the dust from the check valve from getting into the air feed intracavity.

The present invention in a preferred example may be further configured to: the outer surface of the shell is provided with a buffering air bag and a communicating pipeline, wherein the buffering air bag is used for buffering the impact of an object and is communicated with the air pressure chamber through the communicating pipeline.

Through adopting above-mentioned technical scheme, because the space in the mine opening is comparatively narrow and long light darker, personnel and the article that personnel held easily bump with this electric block, cause this electric block's impaired or personnel's injury, personnel's accessible is opened and is opened the valve and aerify the buffering gasbag, protects the casing, avoids the casing to receive the striking and impaired, perhaps personnel striking casing and injury.

The present invention in a preferred example may be further configured to: the buffer air bag is provided with an air blow pipe and an air gun, the air blow pipe is communicated with the buffer air bag, and the air gun is communicated with the air blow pipe.

Through adopting above-mentioned technical scheme, the setting up of air gun makes the gaseous casing of clearing up of storing in the usable buffering gasbag of personnel, will adhere to the dust blow-off on the casing surface.

The present invention in a preferred example may be further configured to: the casing is equipped with the waxing device, the waxing device includes waxing roller one, waxing roller two, waxing roller one, waxing roller two rotate by the driving motor drive, the slew velocity of waxing roller one, waxing roller two is the same, rotation opposite direction, the interval that supplies the chain ring to pass has between waxing roller one, the waxing roller two, the surface of waxing roller one, waxing roller two all is equipped with the recess that supplies the chain ring embedding, the recess inner wall is equipped with the cotton layer of elasticity, be equipped with the paraffin layer on the cotton layer of elasticity.

Through adopting above-mentioned technical scheme, when the chain link was got into waxing roller one, waxing roller two by sprocket feed, the wall of the both sides of chain link dorsad was embedded into respectively in the recess on waxing roller one and the waxing roller two and offset with the paraffin layer, after the chain link was passed through waxing attachment, can be coated one deck paraffin, with chain link and air separation, make the chain link be difficult for rustting to can reduce the dust and adhere to the chain link on, make the chain link keep clean.

In summary, the invention includes at least one of the following beneficial technical effects:

1. by arranging the high-pressure airflow generating device and the pulse valve, the electric hoist can blow dust attached to chain rings away from the chain rings, so that the dust is difficult to enter the inside of the electric hoist and the dust is difficult to enter a rotating gap;

2. by arranging the buffering air bag, when personnel or objects in a mine hole collide with the electric hoist, the buffering air bag can buffer and protect the personnel and the electric hoist;

3. through setting up the waxing attachment, this electric block can last the waxing to the link, makes its surface be difficult for rustting, difficult adhesion dust.

Drawings

Fig. 1 is a first perspective structural view of an electric block for a mine hole according to a first embodiment;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a second perspective view of the first embodiment;

FIG. 4 is a cross-sectional view B-B of FIG. 3;

FIG. 5 is a schematic structural view of a waxing device and a sprocket according to the first embodiment;

fig. 6 is a schematic structural view of the ball worm gear transmission according to the second embodiment.

In the figure, 1, a housing; 11. perforating; 13. a wind supply cavity; 14. an air passage; 141. a main channel; 142. a branch road; 15. a one-way valve I; 16. a filter housing; 17. a buffer air bag; 171. an air blowing pipe; 172. an air gun; 18. a communicating pipe; 2. a drive motor; 3. a reduction gear set; 4. a sprocket; 5. a chain link; 6. a hook; 7. a chain loop pocket; 8. a high pressure gas flow generating device; 81. a cam; 82. pushing the plate; 83. a second one-way valve; 84. a pressure limiting valve; 85. a slider; 86. a push rod; 87. an air pressure chamber; 88. a pulse valve; 9. a waxing device; 91. a first waxing roller; 92. a second waxing roller; 93. a groove; 94. ball worm gear and worm transmission mechanism; 941. a worm; 942. a ball worm gear; 95. a brake.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 and 2, the electric hoist for a mine cave disclosed by the invention comprises a shell 1, a driving motor 2, a reduction gear set 3, a chain wheel 4, a chain ring 5 and a hook 6, wherein the driving motor 2, the reduction gear set 3 and the chain wheel 4 are all positioned in the shell 1, the tail end of a motor shaft of the driving motor 2 is provided with a brake 95 (not shown in the figure) for braking the motor shaft of the driving motor 2, the shell 1 is provided with a perforation 11 (refer to fig. 3) for the chain ring 5 to penetrate out, an inlet hole for the chain ring 5 to penetrate in and a chain ring 5 bag for the chain ring 5 to be placed, the opening of the chain ring 5 bag is fixedly attached to the outer wall of the shell 1, so that dust cannot enter the chain ring 5 bag, the chain ring 5 bag between the chain ring 5 bag and the inlet hole is isolated from the outside, the chain wheel 4 positioned in the shell 1 is movably embedded on the chain wheel 4 along, the chain link 5 is wound up.

Referring to fig. 2 and 3, an air supply cavity 13, an air channel 14 communicated with the air supply cavity 13, and a first check valve 15 are arranged in the housing 1, the air supply cavity 13 is communicated with the outside through the first check valve 15, a high-pressure airflow generating device 8 for providing compressed airflow for the air channel 14 is arranged in the air supply cavity 13, the air channel 14 (refer to fig. 4) is communicated with the hole wall of the through hole 11, the port of the air channel 14 faces the chain ring 5, referring to fig. 2, the high-pressure airflow generating device 8 comprises a cam 81, a push plate 82, a second check valve 83 and a pressure limiting valve 84 which are sequentially arranged, the cam 81 is fixedly connected with the motor shaft of the driving motor 2, the cam 81 is driven to rotate by the driving motor 2, the push plate 82 is connected with the air supply cavity 13 in a sliding manner, the circumferential side wall of the push plate is attached to the cavity wall of the air supply cavity 13, a compression chamber is formed between the second check valve 83 and the push plate, air can flow from the compression chamber to the air pressure chamber 87 between the second check valve 83 and the pressure limiting valve 84 through the check valve, and is discharged from the pressure limiting valve 84 after reaching a certain pressure, the cam 81 is provided with a sliding block 85 which slides along the circumferential direction of the cam 81, the sliding block 85 is in sliding connection with the cam 81 through a sliding groove which is arranged along the circumferential direction of the cam 81, the sliding groove is in a necking shape, and the sliding block 85 cannot be separated from the cam 81. The push plate 82 is fixedly provided with a push rod 86, the axial direction of the push rod 86 is along the sliding direction of the push plate 82, the end part of the push rod 86 is connected with a sliding block 85, a first check valve 15 is positioned between the push plate 82 and a second check valve 83, the shell 1 is fixedly provided with a filter cover 16 for filtering air, the first check valve 15 is communicated with the inner space of the filter cover 16, a filter hole is arranged in the filter cover 16 in a penetrating manner, and dust can be prevented from entering the air supply cavity 13 from the check valve due to the arrangement of the filter cover 16.

When the driving motor 2 rotates, the cam 81 is driven to rotate, the sliding block 85 is connected with the cam 81 in a sliding mode, the cam 81 moves through the push rod 86, the sliding block 85 is limited by the push rod 86 and only moves repeatedly in a variable speed mode along the sliding direction of the push plate 82, air between the push plate 82 and the second one-way valve 83 is compressed, the compressed air enters the air pressure chamber 87 through the second one-way valve 83, when the pressure of the air pressure chamber 87 exceeds the upper limit of the pressure limiting valve 84, compressed air flow is discharged to the air channel 14 from the pressure limiting valve 84 and blown to the chain ring 5 through the air channel 14, and dust on the chain ring 5 is cleaned.

The shell 1 is provided with a pulse valve 88, the pulse valve 88 is communicated with the air channel 14 and divides the air channel 14 into two parts which are communicated with each other, the pulse valve 88 can change the input high-pressure continuous airflow into short impact airflow which is input into the air channel 14, and the cleaning effect of the output airflow on the chain rings 5 is better.

Referring to fig. 3 and 4, the cross-sectional shape of the perforation 11 is cross-shaped, the shape of the perforation 11 corresponds to the shape of the link 5, so that the link 5 can smoothly pass through the perforation 11, the air channel 14 includes a main channel 141 and a plurality of branches 142, the ports of the branches 142 are communicated with the inner wall of the perforation 11, the ports of the branches 142 are arranged at intervals along the circumferential direction of the perforation 11, the arrangement of the branches 142 enables the air channel 14 to blow air through the link 5 passing through the perforation 11 from a plurality of angles, so that the cleaning effect is improved, the ends of the branches 142 are all arranged obliquely towards the outer orifice of the perforation 11, and the branches 142 are obliquely arranged to blow out dust on the link 5 from the orifice of the perforation 11 to the outside, so that the dust is not easy to splash into the casing 1 in the process of being blown away by the air.

Referring to fig. 1 and 3, a buffer airbag 17 for buffering an object impact and a communication pipe 18 are fixedly arranged on the outer surface of the housing 1, the buffer airbag 17 is communicated with the air pressure chamber 87 through the communication pipe 18, and the communication pipe 18 is provided with an opening valve. Because the space in the mine hole is comparatively narrow and light is darker, personnel and the article that personnel held easily bump with this electric block, cause this electric block's impaired or personnel's injury, personnel's accessible is opened and is opened the valve and aerify buffering gasbag 17, protects casing 1, avoids casing 1 to receive the striking and impaired, perhaps personnel strike casing 1 and be injured. Buffering gasbag 17 is equipped with gas blow pipe 171, air gun 172, and gas blow pipe 171 and buffering gasbag 17 inner space intercommunication, air gun 172 and gas blow pipe 171 intercommunication, the setting up of air gun 172 makes the usable buffering gasbag 17 of personnel store in the gas clear up casing 1, will attach to the dust on casing 1 surface and blow away.

Referring to fig. 4 and 5, a waxing device 9 is arranged in the casing 1, the waxing device 9 comprises a first waxing roller 91 and a second waxing roller 92, the first waxing roller 91 and the second waxing roller 92 are rotatably connected with the casing 1, the chain wheel 4 drives the first waxing roller 91 to rotate through a synchronous belt transmission mechanism arranged on the first waxing roller 91, the second waxing roller 92 is meshed with a gear arranged on the first waxing roller 91 through a second waxing gear arranged at the end part of the second waxing roller 92, so that the rotating direction of the first waxing roller 91 is consistent with the rotating direction of the chain wheel 4, the rotating directions of the first waxing roller 91 and the second waxing roller 92 are opposite, the rotating linear speeds of the first waxing roller 91, the second waxing roller 92 and the chain wheel 4 are the same, and a space for the chain ring 5 to pass through is formed between the first waxing roller 91 and the first waxing roller 91.

The surface of the second waxing roller 92 is provided with a groove 93 for the chain ring 5 to be embedded, the shape of the groove 93 is matched with the shape box of the chain ring 5, the inner wall of the groove 93 is provided with an elastic cotton layer, and the elastic cotton layer is provided with a paraffin layer. When the chain ring 5 is driven by the chain wheel 4 to enter between the first waxing roller 91 and the second waxing roller 92, two opposite side walls of the chain ring 5 are respectively embedded into the grooves 93 on the first waxing roller 91 and the second waxing roller 92 and are abutted against the paraffin layer, so that the paraffin layer is in close contact with the surface of the chain ring 5, after the chain ring 5 passes through the waxing device 9, the surface of the chain ring 5 can be attached with a layer of paraffin, the chain ring 5 is separated from moisture of a mine hole, the chain ring 5 is not easy to rust, dust can be reduced and attached to the chain ring 5, and the chain ring 5 is kept clean.

The implementation principle of the embodiment is as follows: through setting up high-pressure draught generating device 8 and pulse valve 88, driving motor 2's rotation among the 8 accessible of high-pressure draught generating device in this electric block, promote or the in-process of issuing at this electric block to chain ring 5, produce high-pressure draught, high-pressure draught produces the air current shock wave through pulse valve 88, strike the dust on the chain ring 5, blow away from chain ring 5 with it, it is difficult for getting into inside this electric block along with chain ring 5 to make it, aerify buffering gasbag 17 by the gas that high-pressure draught generating device 8 produced again, protect this electric block, gas accessible air cavity in the gasbag emits the surface dust to this electric block simultaneously and clears up, this electric block adopts paraffin to replace lubricating oil, when protecting chain ring 5, reducible chain ring 5 surface attached dust, it is comparatively ingenious.

Example two:

referring to fig. 6, the difference between the second embodiment and the first embodiment is: the chain wheel 4 is driven by a ball worm gear transmission mechanism 94 arranged in the housing, the ball worm gear transmission mechanism 94 is a transmission structure disclosed in chinese patent publication No. CN102338195A, the ball worm gear transmission mechanism 94 includes a worm 941 and a ball worm wheel 942, the ball worm wheel 942 is engaged with the worm 941, the worm 941 is coaxially fixed with the motor shaft of the driving motor 2, and the chain wheel 4 is coaxially fixed with the worm wheel 942.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides an electric block for mine opening, includes casing (1), driving motor (2), reduction gear group (3), sprocket (4), chain ring (5), lifting hook (6), chain ring (5) bag, driving motor (2), reduction gear group (3), sprocket (4) all are located casing (1), chain ring (5) activity is inlayed on chain ring (5), casing (1) is equipped with perforation (11) that supply chain ring (5) to wear out and the inlet hole that supplies chain ring (5) to penetrate, characterized by: link (5) bag sack circumference edge and casing (1) fixed surface are connected and will advance the hole and seal with the external world, casing (1) is equipped with air feed chamber (13), air passage (14), check valve (15) with air feed chamber (13) intercommunication, air feed chamber (13) are through check valve (15) and external intercommunication, install high pressure draught generating device (8) that provide compressed air for air passage (14) in air feed chamber (13), air passage (14) and the pore wall intercommunication of perforation (11), the port of air passage (14) is towards link (5).

2. The electric block for the mine tunnel according to claim 1, which is characterized in that: the high-pressure airflow generating device (8) comprises a cam (81), a push plate (82), a second check valve (83) and a pressure limiting valve (84) which are sequentially arranged, the cam (81) is driven by a driving motor (2) to rotate, the circumferential side wall of the push plate (82) and the air supply cavity (13) are in sliding connection and are attached to the cavity wall of the air supply cavity (13), the cam (81) is provided with a sliding block (85) which slides along the circumferential direction of the cam (81), the sliding block (85) cannot be separated from the cam (81), the push plate (82) is fixedly provided with a push rod (86), the axial direction of the push rod (86) is along the sliding direction of the push plate (82), the end part of the push rod (86) is connected with the sliding block (85), the first check valve (15) is positioned between the push plate (82) and the second check valve (83), and the second check valve (83) and the pressure limiting valve (84) respectively separate the air supply cavity (13, the pressure limiting valve (84) is in communication with the air passage (14).

3. The electric block for the mine tunnel according to claim 2, wherein: the shell (1) is provided with a pulse valve (88), and the pulse valve (88) is communicated with the air channel (14) and divides the air channel (14) into two parts which are communicated with each other.

4. The electric block for the mine tunnel according to claim 3, wherein: the cross-sectional shape of perforation (11) is the cross form, air channel (14) include main passageway (141) and a plurality of branch way (142), a plurality of the port of branch way (142) sets up along the circumference interval of perforation (11).

5. The electric block for the mine hole as claimed in claim 4, wherein: the ends of a plurality of said branches (142) are each arranged obliquely towards the outer orifice of the perforation (11).

6. The electric block for the mine tunnel according to claim 1, which is characterized in that: the shell (1) is provided with a filter cover (16) used for filtering air, and the first check valve (15) is communicated with the inner space of the filter cover (16).

7. The electric block for the mine tunnel according to claim 2, wherein: the outer surface of the shell (1) is provided with a buffering air bag (17) for buffering the impact of an object and a communicating pipeline (18), and the buffering air bag (17) is communicated with the air pressure chamber (87) through the communicating pipeline (18).

8. The electric block for the mine hole as claimed in claim 7, wherein: buffer air bag (17) are equipped with gas blow pipe (171), air gun (172), gas blow pipe (171) and buffer air bag (17) intercommunication, air gun (172) and gas blow pipe (171) intercommunication.

9. The electric block for the mine tunnel according to claim 1, which is characterized in that: casing (1) is equipped with waxing attachment (9), waxing attachment (9) are including waxing roller (91), waxing roller two (92), waxing roller (91), waxing roller two (92) are rotated by driving motor (2) drive, the slew velocity of waxing roller (91), waxing roller two (92) is the same, rotation direction is opposite, it supplies the interval that the chain ring passed to have between waxing roller (91), the waxing roller two (92), the surface of waxing roller (91), waxing roller two (92) all is equipped with recess (93) that supply chain ring (5) embedding, recess (93) inner wall is equipped with the cotton layer of elasticity, be equipped with the paraffin layer on the cotton layer of elasticity.