阅读说明：本技术 一种内圆磨砂片柔性进给切断工具 (Flexible cutting tool that feeds of interior circle dull polish piece ) 是由 曲云霞 靳旋 侯书军 李慨 张磊 于 2019-10-14 设计创作，主要内容包括：本发明公开一种内圆磨砂片柔性进给切断工具,包括磨砂片、磨砂片夹持机构、柔性进给机构；所述磨砂片包括圆环状磨砂片和嵌合在圆环状磨砂片外圈的金属安装环,其工作区域为圆环状磨砂片内孔；所述磨砂片夹持机构包括夹板与磨砂片侧轴承端盖；所述的螺旋进给机构包括外筒、内筒、轴承、气囊、气囊压板、电机侧轴承端盖、直流电机连接板、小同步带轮、大同步带轮、直流电机；切削过程由柔性进给机构实现定弧长切削,避免因切削弧长的改变引起切削力变换,从而避免产生扰动通过贯入人体的棒状异物对人体产生二次伤害。该切断工具具有低扰动、安全系数高、便携性好、冲击小、振动小和能在狭小空间救援切割等优势。(The invention discloses a flexible feeding and cutting tool for an inner circle abrasive sheet, which comprises an abrasive sheet, an abrasive sheet clamping mechanism and a flexible feeding mechanism, wherein the flexible feeding mechanism is arranged on the inner circle abrasive sheet clamping mechanism; the grinding sheet comprises a circular grinding sheet and a metal mounting ring embedded on the outer ring of the circular grinding sheet, and the working area of the grinding sheet is an inner hole of the circular grinding sheet; the grinding sheet clamping mechanism comprises a clamping plate and a grinding sheet side bearing end cover; the spiral feeding mechanism comprises an outer cylinder, an inner cylinder, a bearing, an air bag pressing plate, a motor side bearing end cover, a direct current motor connecting plate, a small synchronous belt wheel, a large synchronous belt wheel and a direct current motor; the cutting process realizes fixed arc length cutting by the flexible feeding mechanism, avoids cutting force change caused by cutting arc length change, and further avoids generating disturbance to generate secondary damage to a human body through rod-shaped foreign matters penetrating into the human body. The cutting-off tool has the advantages of low disturbance, high safety coefficient, good portability, small impact, small vibration, capability of rescuing and cutting in a narrow space and the like.)

1. The flexible feeding and cutting tool for the inner circle abrasive sheet is characterized by comprising an abrasive sheet, an abrasive sheet clamping mechanism and a flexible feeding mechanism; the grinding sheet comprises a circular grinding sheet and a metal mounting ring embedded on the outer ring of the circular grinding sheet, and the working area of the grinding sheet is an inner hole of the circular grinding sheet;

the grinding sheet clamping mechanism comprises a clamping plate and a grinding sheet side bearing end cover; the spiral feeding mechanism comprises an outer cylinder, an inner cylinder, a bearing, an air bag pressing plate, a motor side bearing end cover, a direct current motor connecting plate, a small synchronous belt wheel, a large synchronous belt wheel and a direct current motor;

the clamping plate and the grinding sheet side bearing end cover are both provided with circular grooves matched with the metal mounting rings of the grinding sheets, the grinding sheets are arranged between the clamping plate and the grinding sheet side bearing end cover, the clamping plate and the grinding sheet side bearing end cover are fixed by bolts, and the metal mounting rings on the grinding sheets are clamped by the circular grooves between the clamping plate and the grinding sheet side bearing end cover; fixing the end cover of the side bearing of the abrasive sheet on one end of the outer cylinder by using a bolt to ensure that power is transmitted to the abrasive sheet when the outer cylinder rotates;

the inner barrel and the outer barrel are sleeved together through a pair of bearings arranged in clamping grooves at two ends between the outer wall of the inner barrel and the inner wall of the outer barrel, the bearings are positioned through the grinding sheet side bearing end covers and the motor side bearing end covers arranged at two sides of the bearings, and the grinding sheet side bearing end covers and the motor side bearing end covers are fixedly connected to end faces at two ends of the outer barrel respectively through bolts; the tail end of the inner barrel on one side of the grinding sheet side bearing end cover is positioned in the outer barrel, and the tail end of the inner barrel on one side of the motor side bearing end cover penetrates through the motor side bearing end cover and is positioned on the outer side of the outer barrel;

the air bags are cylindrical and comprise three air bags, namely a first air bag, a second air bag and a third air bag; the inner wall of the inner barrel is uniformly provided with three grooves along the radial direction, the sizes of the grooves are matched with those of the air bags, and the three air bags are respectively bonded into the grooves on the inner wall of the inner barrel in a glue bonding mode; an air bag pressing plate is arranged at the tail end of the inner barrel on one side of the grinding sheet side bearing end cover, a motor connecting plate is arranged at the tail end of the inner barrel on one side of the motor side bearing end cover through threads, and the air bag is axially limited through the air bag pressing plate and the motor connecting plate; the middle part of the motor connecting plate is fixed on the tail end of the inner cylinder;

the middle parts of the clamping plate, the sanding sheet side bearing end cover, the motor side bearing end cover, the air bag pressing plate and the motor connecting plate are all provided with through holes, wherein the through holes in the middle parts of the clamping plate, the sanding sheet side bearing end cover and the motor side bearing end cover are the same in aperture, the aperture of the through hole in the middle part of the air bag pressing plate is larger than that of the through hole in the middle part of the motor connecting plate, the aperture of the through hole in the middle part of the sanding sheet side bearing end cover is larger than that of the through hole in the middle part of the;

the outer periphery of the tail end of the outer cylinder, which is provided with one end of the motor side bearing end cover, is provided with a large synchronous belt pulley through a jackscrew along the circumferential direction, and the lower part of the outer side of the motor connecting plate is fixedly provided with a direct current motor; a small synchronous belt wheel is arranged on an output shaft of the direct current motor, and the power of the motor is transmitted to the small synchronous belt wheel through a key and a jackscrew; the large synchronous belt wheel is connected with the small synchronous belt wheel through a synchronous belt; the direct current motor transmits power to the small synchronous belt wheel through key transmission and then to the large synchronous belt wheel through the synchronous belt, and the large synchronous belt wheel also transmits the power to the outer barrel through the key transmission; the direct current motor is fixedly connected to a through hole at the lower part of the motor connecting plate by using a bolt, and the motor connecting plate is fixedly connected to the right end of the inner cylinder by internal threads;

the three air bags are all connected with a pressure stabilizing air source, and one end of each air bag, which is close to the motor connecting plate, is led out to form an air guide pipe which penetrates through the motor connecting plate to be connected with the pressure stabilizing air source.

2. The flexible feed cutoff tool for the inner circle sanding sheet as defined in claim 1 wherein the motor connecting plate is provided with an air intake port communicating with the interior of the inner barrel, the air intake port being connected to a negative pressure suction pump through an air duct, and debris generated during operation of the sanding sheet being discharged from the air intake port through the interior of the inner barrel by the air pump.

3. The flexible feed cutoff tool for the inner circle sanding sheet of claim 1 wherein a handle is transversely disposed on the upper portion of the motor attachment plate on a side thereof facing the outer barrel, the handle being manually held to prevent circumferential rotation of the motor attachment plate and to support the cutoff tool during operation of the sanding sheet.

Technical Field

The invention relates to the technical field of emergency rescue tools, in particular to a flexible feeding and cutting tool for an inner circle abrasive sheet.

Background

With the rapid development of economy in China, the process of urbanization is gradually accelerated, so that the number of construction sites is greatly increased. In the construction process of a construction site, because engineering management is not in place, construction workers fall down or building materials collapse, so that accidents that the bodies of the workers are penetrated by metal foreign bodies such as steel bars, steel pipes and the like frequently occur. The rapid development of economy also enables the traffic industry of China to be rapidly expanded, the quantity of automobiles is more and more, traffic accidents are increased along with the increase of the quantity of the automobiles, and the situation that foreign matters such as frames penetrate into human bodies in the accidents often occurs. In recent years, disasters such as earthquakes, typhoons, fires and the like frequently occur in China, and the situation that metal foreign bodies penetrate through human bodies after buildings collapse is also rare.

The injury condition of a wounded person penetrating into a human body has the characteristics of entrance and exit, injured channel, open wound and heavy pollution caused by sharp cutting edge injury, and has the characteristics of heavy contusion and laceration and more secondary injuries caused by blunt crush injury, and the metal foreign matters penetrating into the human body can extrude and deform the injured channel, surrounding tissues and organs, so that the double effects of compression hemostasis and blood vessel blood flow blockage are achieved, if the metal foreign matters are pulled out suddenly, the wounded person can generate a heavy bleeding condition, so that the tube-rod-shaped foreign matters penetrating into the human body are forbidden to be pulled out in a rescue site, the foreign matters are cut to the length convenient for transporting the wounded person as soon as possible, and then the wounded person is sent to a hospital for operation and emergency treatment.

The too long metal foreign bodies penetrating into the human body seriously affect the transportation and rescue of the wounded, so how to rapidly and safely cut off the metal foreign bodies is a prerequisite condition for the wounded to be timely rescued. The existing rescue equipment is generally three types of hydraulic shears, steel bar quick breakers and toothless saws. For hydraulic shears and reinforcing steel bar quick-breaking devices, foreign matters are instantaneously broken by high-pressure shear stress. But a very large shearing force is generated at the moment of cutting and causes the vibration of the foreign matter penetrating into the human body. The vibration can cause great pain to the wounded, and in severe cases, internal organs of the human body can be damaged, so that the life safety of the wounded is endangered. The method is characterized in that a toothless saw and other grinding equipment are utilized for rescue, firstly, the toothless saw is large in size and not beneficial to carrying and narrow space rescue operation, the grinding equipment is used for cutting by utilizing high-speed rotation of a grinding sheet, sparks splash in the cutting process, complex factors of the rescue site environment are more, and open fire is not expected to appear in the rescue process; in the process of cutting the rod-shaped metal foreign bodies, along with the feeding of the abrasive sheet, the cutting arc length is a process of firstly increasing and then decreasing along with the feeding, so that the feeding force provided by rescue workers is also a process of firstly increasing and then decreasing, and the changed feeding force provided by the workers is not easy to control, so that the vibration of the metal foreign bodies is easily caused, and secondary damage is caused to the human body. The existing grinding and cutting equipment is large in size, and the condition that people are injured by a broken piece is easily caused in the cutting and rescuing process of a grinding piece rotating at high speed.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides the flexible feeding cutting-off tool for the inner circle abrasive sheet, which utilizes the inner circle cutting of the abrasive sheet to effectively avoid the spark splashing condition in the cutting process; and a negative pressure air pump suction device is provided to suck away the cutting chips generated by cutting and accelerate air convection so as to reduce the temperature of the cutting area. In order to avoid the secondary damage to human body caused by the disturbance caused by the change of cutting force caused by the change of cutting arc length in the cutting process, a flexible feeding mechanism is needed to feed and grind the cutting. Disturbance caused by the change of the feeding force in the cutting process is absorbed and reduced by the flexible feeding mechanism, and secondary damage to a human body caused by the disturbance generated by the change of the feeding force in the rescue process is further reduced.

The technical scheme for solving the technical problems is as follows: designing a flexible feeding and cutting tool for an inner circle abrasive sheet, which is characterized by comprising an abrasive sheet, an abrasive sheet clamping mechanism and a flexible feeding mechanism; the grinding sheet comprises a circular grinding sheet and a metal mounting ring embedded on the outer ring of the circular grinding sheet, and the working area of the grinding sheet is an inner hole of the circular grinding sheet;

the grinding sheet clamping mechanism comprises a clamping plate and a grinding sheet side bearing end cover; the spiral feeding mechanism comprises an outer cylinder, an inner cylinder, a bearing, an air bag pressing plate, a motor side bearing end cover, a direct current motor connecting plate, a small synchronous belt wheel, a large synchronous belt wheel and a direct current motor;

the clamping plate and the grinding sheet side bearing end cover are both provided with circular grooves matched with the metal mounting rings of the grinding sheets, the grinding sheets are arranged between the clamping plate and the grinding sheet side bearing end cover, the clamping plate and the grinding sheet side bearing end cover are fixed by bolts, and the metal mounting rings on the grinding sheets are clamped by the circular grooves between the clamping plate and the grinding sheet side bearing end cover; fixing the end cover of the side bearing of the abrasive sheet on one end of the outer cylinder by using a bolt to ensure that power is transmitted to the abrasive sheet when the outer cylinder rotates;

the inner barrel and the outer barrel are sleeved together through a pair of bearings arranged in clamping grooves at two ends between the outer wall of the inner barrel and the inner wall of the outer barrel, the bearings are positioned through the grinding sheet side bearing end covers and the motor side bearing end covers arranged at two sides of the bearings, and the grinding sheet side bearing end covers and the motor side bearing end covers are fixedly connected to end faces at two ends of the outer barrel respectively through bolts; the tail end of the inner barrel on one side of the grinding sheet side bearing end cover is positioned in the outer barrel, and the tail end of the inner barrel on one side of the motor side bearing end cover penetrates through the motor side bearing end cover and is positioned on the outer side of the outer barrel;

the air bags are cylindrical and comprise three air bags, namely a first air bag, a second air bag and a third air bag; the inner wall of the inner barrel is uniformly provided with three grooves along the radial direction, the sizes of the grooves are matched with those of the air bags, and the three air bags are respectively bonded into the grooves on the inner wall of the inner barrel in a glue bonding mode; an air bag pressing plate is arranged at the tail end of the inner barrel on one side of the grinding sheet side bearing end cover, a motor connecting plate is arranged at the tail end of the inner barrel on one side of the motor side bearing end cover through threads, and the air bag is axially limited through the air bag pressing plate and the motor connecting plate; the middle part of the motor connecting plate is fixed on the tail end of the inner cylinder;

the middle parts of the clamping plate, the sanding sheet side bearing end cover, the motor side bearing end cover, the air bag pressing plate and the motor connecting plate are all provided with through holes, wherein the through holes in the middle parts of the clamping plate, the sanding sheet side bearing end cover and the motor side bearing end cover are the same in aperture, the aperture of the through hole in the middle part of the air bag pressing plate is larger than that of the through hole in the middle part of the motor connecting plate, the aperture of the through hole in the middle part of the sanding sheet side bearing end cover is larger than that of the through hole in the middle part of the;

the outer periphery of the tail end of the outer cylinder, which is provided with one end of the motor side bearing end cover, is provided with a large synchronous belt pulley through a jackscrew along the circumferential direction, and the lower part of the outer side of the motor connecting plate is fixedly provided with a direct current motor; a small synchronous belt wheel is arranged on an output shaft of the direct current motor, and the power of the motor is transmitted to the small synchronous belt wheel through a key and a jackscrew; the large synchronous belt wheel is connected with the small synchronous belt wheel through a synchronous belt; the direct current motor transmits power to the small synchronous belt wheel through key transmission and then to the large synchronous belt wheel through the synchronous belt, and the large synchronous belt wheel also transmits the power to the outer barrel through the key transmission; the direct current motor is fixedly connected to a through hole at the lower part of the motor connecting plate by using a bolt, and the motor connecting plate is fixedly connected to the right end of the inner cylinder by internal threads;

the three air bags are all connected with a pressure stabilizing air source, and one end of each air bag, which is close to the motor connecting plate, is led out to form an air guide pipe which penetrates through the motor connecting plate to be connected with the pressure stabilizing air source.

Compared with the prior art, the invention has the beneficial effects that:

(1) in the cutting rescue process, the inner circle grinding piece is used for cutting, sparks and high-temperature particles generated by high-speed grinding are wrapped in the device, and the phenomenon that people are injured by sparks is avoided; the grinding wheel is wrapped in the equipment, so that the phenomenon that the grinding wheel collapses and hurts people can be avoided; the safety of the rescue personnel in the process of on-site rescue is improved.

(2) The inner circle of the grinding wheel is used for cutting, the cutting tightness of the cutting area is better than that of the outer circle grinding wheel, and the air convection in the cutting engineering is accelerated by using negative pressure suction, so that the temperature of the cutting area is reduced.

(3) The cutting process realizes fixed feeding cutting by a flexible feeding mechanism, and avoids the change of cutting force caused by the change of the cutting arc length, thereby generating disturbance and generating secondary damage to a human body through a rod-shaped foreign body penetrating into the human body.

(4) The tool has the advantages of low disturbance, high safety coefficient, good portability, small impact, small vibration, capability of rescuing and cutting in a narrow space and the like, and can integrally strengthen the working capacity of individual soldiers and the demolition rescue capacity.

Drawings

Fig. 1 is an assembly view illustrating an operation state of an embodiment of the present invention.

Fig. 2 is an axial sectional structural view of an embodiment of the present invention.

FIG. 3 is a schematic radial sectional view of a mid-section of an inner barrel according to an embodiment of the present invention.

Fig. 4 is a diagram illustrating the operation of the operation flow of the air bag according to an embodiment of the present invention, wherein fig. 4(a) is a schematic view illustrating a state where the abrasive sheet cuts the rod-shaped foreign object right above, and fig. 4(b) is a schematic view illustrating a state where the abrasive sheet cuts the rod-shaped foreign object left above; 4(c) is a schematic view of the state of the left lower side of the rod-shaped foreign matter cut by the grinding sheet; 4(d) is a schematic view of the state of the right lower side of the rod-shaped foreign matter cut by the grinding sheet; 4(e) is a schematic view of the upper right side of the rod-shaped foreign matter cut by the abrasive sheet; and 4(f) is a schematic view of the state that the abrasive sheet returns to the initial position.

Fig. 5 is a schematic structural view of a polishing sheet according to an embodiment of the invention.

Fig. 6 is a diagram of a simulated rescue scene according to an embodiment of the present invention.

Description of reference numerals: 1-stick foreign matter penetrating into human body; 2-a direct current motor; 3, a synchronous belt; 4, an outer barrel; 5, clamping plates; 6-polishing piece, 6-1-circular polishing piece, 6-2-metal mounting ring and 6-3-circular polishing piece inner hole; 7-airbag number one; 8, an inner cylinder; 9-a direct current motor connecting plate, 9-1-a handle; 10-large synchronous pulley; 11-small synchronous pulley; 12-air bag pressing plate; 13-abrasive sheet side bearing end cap; 14-a bearing; 15-motor side bearing end cap; 16-a flat bond; 17-airbag II; 18-airbag No. three; 19-rescuer's hand; and 20, simulating collapse of the building.

Detailed Description

The present invention will be described in detail with reference to the following description of the drawings.

The invention provides a flexible feeding cutting tool (cutting tool for short, see fig. 1-6) for an inner circle abrasive sheet, which comprises an abrasive sheet 6, an abrasive sheet clamping mechanism and a flexible feeding mechanism; the grinding sheet 6 comprises a circular grinding sheet 6-1 and a metal mounting ring 6-2 embedded on the outer ring of the circular grinding sheet, and the working area of the grinding sheet is an inner hole 6-3 of the circular grinding sheet;

the grinding sheet clamping mechanism comprises a clamping plate 5 and a grinding sheet side bearing end cover 13; the spiral feeding mechanism comprises an outer cylinder 4, an inner cylinder 8, a bearing 14, an air bag pressing plate 12, a motor side bearing end cover 15, a direct current motor connecting plate 9, a small synchronous belt pulley 11, a large synchronous belt pulley 10 and a direct current motor 2;

the clamping plate 5 and the grinding sheet side bearing end cover 13 are both provided with circular grooves matched with the metal mounting rings of the grinding sheets 6, the grinding sheets 6 are arranged between the clamping plate 5 and the grinding sheet side bearing end cover 13, the clamping plate 5 and the grinding sheet side bearing end cover 13 are fixed by bolts, and the metal mounting rings 6-2 on the grinding sheets 6 are clamped through the circular grooves between the clamping plate 5 and the grinding sheet side bearing end cover 13. The abrasive sheet side bearing end cap 13 is fixed to one end of the outer cylinder 4 using bolts, ensuring that power is transmitted to the abrasive sheet 6 when the outer cylinder 4 rotates.

The inner cylinder 8 and the outer cylinder 4 are sleeved together through a pair of bearings 14 arranged in clamping grooves at two ends between the outer wall of the inner cylinder 8 and the inner wall of the outer cylinder 4, the bearings 14 are positioned through polishing sheet side bearing end covers 13 and motor side bearing end covers 15 arranged at two sides of the bearings, and the polishing sheet side bearing end covers 13 and the motor side bearing end covers 15 are fixedly connected to end faces at two ends of the outer cylinder 4 respectively through bolts. The end of the inner cylinder 8 on the side of the grinding sheet side bearing end cover 13 is positioned inside the outer cylinder 4, and the end of the inner cylinder 8 on the side of the motor side bearing end cover 15 passes through the motor side bearing end cover 15 and is positioned outside the outer cylinder 4.

The air bags are cylindrical air bags and comprise three air bags, namely a first air bag 7, a second air bag 17 and a third air bag 18; the inner wall of the inner barrel 8 is uniformly provided with three grooves along the radial direction, the sizes of the grooves are matched with those of the air bags, and the three air bags are respectively bonded into the grooves on the inner wall of the inner barrel 8 in a glue bonding mode; an air bag pressing plate 12 is arranged at the tail end of the inner cylinder 8 at one side of the grinding sheet side bearing end cover 13, a motor connecting plate 9 is arranged at the tail end of the inner cylinder 8 at one side of the motor side bearing end cover 15 through threads, and the air bag is axially limited through the air bag pressing plate 12 and the motor connecting plate 9; wherein, the air bag pressure plate 12 is connected to the inner side of the inner cylinder 8 through screw threads, and the middle part of the motor connecting plate 9 is fixed on the tail end of the inner cylinder 8;

the middle parts of the clamping plate 5, the grinding sheet 6, the grinding sheet side bearing end cover 13, the motor side bearing end cover 15, the air bag pressing plate 12 and the motor connecting plate 9 are all provided with through holes, wherein the through holes in the middle parts of the clamping plate 5, the grinding sheet side bearing end cover 13 and the motor side bearing end cover 15 have the same aperture, the aperture of the through hole in the middle part of the air bag pressing plate 12 is larger than that of the through hole in the middle part of the motor connecting plate 9, the aperture of the through hole in the middle part of the grinding sheet side bearing end cover 13 is larger than that of the through hole in the middle part of the air bag pressing;

the outer periphery of the tail end of the outer cylinder 4, which is provided with one end of the motor side bearing end cover 15, is provided with a large synchronous belt pulley 10 along the circumferential direction through a jackscrew, and the lower part of the outer side of the motor connecting plate 9 is fixedly provided with a direct current motor 2; a small synchronous belt pulley 11 is arranged on an output shaft of the direct current motor 2, and the power of the motor is transmitted to the small synchronous belt pulley 11 through keys and jackscrews; the large synchronous pulley 10 is connected with the small synchronous pulley 11 through the synchronous belt 3; the direct current motor 2 transmits power to the small synchronous belt wheel 11 through key transmission, and then transmits the power to the large synchronous belt wheel 10 through the synchronous belt 3, and the large synchronous belt wheel 10 also transmits the power to the outer barrel 4 through the key transmission. The direct current motor 2 is fixedly connected to a through hole in the lower portion of the motor connecting plate 9 through a bolt, and the motor connecting plate 9 is fixedly connected to the right end of the inner barrel 8 through an internal thread.

The three air bags are all connected with a pressure stabilizing air source, and one end of each air bag, which is close to the motor connecting plate 9, is led out to form an air guide pipe which penetrates through the motor connecting plate 9 to be connected with the pressure stabilizing air source. The pressure stabilizing air source is an air pump. In addition, an air suction port is arranged on the motor connecting plate 9 and is communicated with the inside of the inner cylinder 8, the air suction port is connected with a negative pressure suction pump through an air duct, and scraps generated when the sanding sheet 6 works are discharged from the air suction port through the inside of the inner cylinder 8 through the negative pressure suction pump.

The upper part of the motor connecting plate 9 is transversely provided with a handle 9-1 towards one side of the outer cylinder 4, and when the abrasive sheet 6 works, the handle 9-1 is held by hands to prevent the motor connecting plate 9 from rotating in the circumferential direction and play a role in supporting a cutting tool.

In the implementation of the present invention, the driving power source is preferably a dc motor, but the driving power source may be other types, such as an ac power tool or a gasoline tool.

The three air bags are respectively connected with an inflation inlet of a pressure stabilizing air source, and are shown by a first air bag 7 in the figure 2. Connecting an air suction port on a motor connecting plate 9 with a negative pressure suction pump interface; the screw feeding process is explained below, and is shown in fig. 3, which is a radial cross-sectional view of the middle section of the inner cylinder 8 when the cutting tool is working, wherein an annular sanding block inner hole 6-3 is used for indicating the spatial position of the contour line of the inner ring of the sanding surface of the sanding block 6, a first air bag 7, a second air bag 17 and a third air bag 18 are uniformly arranged inside the inner cylinder 8 when viewed from the right side of the inner cylinder 8, the contact surfaces of the three cylindrical air bags and the inner cylinder 8 are bonded by glue, the three cylindrical air bags are used for clamping the rod-shaped foreign body 1, and the screw feeding is controlled by controlling the inflation and deflation of the cylindrical air bags. Each cylindrical air bag is provided with an air pump for providing air with certain pressure.

Simulation of rescue scenario, as shown in fig. 6: wherein 19 is the hands of the rescuer, and 20 is the building after the building collapses. The rescuer holds the metal foreign matters fixedly penetrated into the two sides of the body of the wounded person to prevent the foreign matters penetrated into the human body from generating disturbance in the cutting process. Taking a hot-rolled ribbed steel bar HRB600 for concrete with the diameter of 25mm commonly used in buildings as an example, the yield strength is 600MPa, and the tensile strength is 730 MPa. The material used by the sanding sheet 6 is common brownCorundum 60^#The diameter of an inner hole is 30mm, the diameter of an outer circle is 125mm, and the diameter of the inner circle of the metal mounting ring is 90 mm.

When the rod-shaped foreign bodies are clamped among the three cylindrical air bags in the inner cylinder 8 at first, the pressure stabilizing air source starts to work, when the air with the stable pressure of 0.3MPa can be provided and the stable negative pressure attraction force is provided, the three air bags are simultaneously inflated, as shown in figure 3, a switch of the direct current motor is turned on, so that the abrasive sheet 6 starts to rotate, namely the contour line of the inner ring of the abrasive surface of the abrasive sheet 6 starts to rotate. Then the second air bag 17 and the third air bag 18 continue to be inflated, the first air bag 7 is deflated, p2 is p3> p1, the inner cylinder 8 is moved downwards under the linkage of the three air bags, and the abrasive sheet 6 at the front end of the outer cylinder 9 is moved downwards, as shown in fig. 4 (a); and then cutting is started, and the contact arc length of the cutting area is judged by detecting a rotating speed signal of the driving direct current motor 2. When the preset contact arc length is reached, namely the cutting force is in a stable state and has minimum secondary damage to a human body, the second air bag 17 is controlled to be inflated, the first air bag 7 and the third air bag 18 are deflated, so that p1 is p2< p3, the three air bags are linked to enable the outer cylinder to move downwards and rightwards, and the sanding sheet 6 cuts the upper left side of the rod-shaped foreign body, as shown in fig. 4 (b); next, the third air bag 18 is deflated, the first air bag 7 and the second air bag 17 are inflated, p1 is p3> p2, the outer cylinder 9 is moved to the right upper side under the linkage of the air bags, and the sanding sheet 6 cuts the left lower side of the rod-shaped foreign matter, as shown in fig. 4 (c); then the second air bag 17 is deflated, the first air bag 7 and the third air bag 18 are inflated, p1 is p2> p3, the outer cylinder 9 moves upwards leftwards under the linkage of the air bags, and the sanding sheet 6 cuts the lower right side of the rod-shaped foreign matter, as shown in fig. 4 (d); next, the third air cell 18 is inflated, the first air cell 7 and the second air cell 17 are deflated, p1 is p3< p2, the outer cylinder 9 is moved left and down under the linkage of the air cells, and the sanding sheet 6 cuts the upper right side of the rod-shaped foreign matter, as shown in fig. 4 (e); finally, the second airbag 17 and the third airbag 18 are inflated, the first airbag 7 is deflated, p1 is p2< p3, the cutting position is returned to the initial cutting position, and one-circle cutting is completed, as shown in fig. 4 (f). The first round of cutting is finished, the feeding amount is increased, the process is repeated on the basis of the first round of cutting, the second round of cutting is carried out, flexible feeding is achieved, the cutting force is always ensured to be in a fixed state, the feeding force is ensured not to be disturbed due to the change of the cutting arc length, the feeding force is ensured to be in a constant value, and further secondary damage to a human body in the rescue process is minimized.

The present invention is not limited to the above-described embodiments, and other modifications are possible by those skilled in the art within the spirit and scope of the present invention as long as the functions implemented by the present invention are the same as or similar to those of the present invention.