CN104722839A - Amplitude modulation type security saw - Google Patents

Abstract

The invention discloses an amplitude modulation type safety saw for emergency rescue, which is composed of a housing, a transmission mechanism, an amplitude adjustment mechanism, a saw blade clamping device and a retractable saw bow. In the transmission mechanism, the motor drives the eccentric pin as a crank through synchronous belt transmission and gear transmission. The eccentric pin, the slider A, the chute, the short sliding shaft and the short sliding shaft support form a crank double slider mechanism, and the short sliding shaft is driven by the eccentric pin to perform linear reciprocating motion. The range adjustment mechanism can enlarge or reduce the motion range of the short sliding shaft and transmit it to the long sliding shaft by adjusting the position of the range adjusting shaft. One end of the long sliding shaft installs the saw blade through the saw blade clamping device, which drives the saw blade to reciprocate and linearly move. The retractable saw bow can adjust the telescopic length according to the application, and the pulley can form a good guide and support for the saw blade.

Description

AM safety saw

technical field

The invention relates to a safety saw, in particular to an amplitude-modulated safety saw used for rescue, which belongs to an emergency rescue tool for trapped persons in daily life accidents, car accidents, earthquakes and the like.

Background technique

Human bodies are often trapped in accidents such as machine operation errors and car accidents in daily life. Most of the current rescue methods use cutting tools such as cutting machines to cut off the metal, concrete and other objects that are clamping the human body. The trapped limb was freed. Generally, the stuck parts of the human body have local congestion, deformation and swelling, and the hard object is in close contact with the human body. There cannot be a gap between the object to be cut and the skin. This determines that in the process of cutting hard objects, the cutting tool It is unavoidable to touch human skin, but the speed and amplitude of the cutter movement of the cutting tool are very large at present. When the cutter touches the human body, it will inevitably cause injury. Therefore, in order to prevent the tools used in the rescue process from causing injury to the human body, the rescuers operate very cautiously, with slow work progress and low efficiency.

The most important thing in rescue is to shorten the rescue time as much as possible, and to ensure the personal safety of the rescued. In this case, a safety cutting saw is designed, which can quickly complete the cutting tasks of metal, concrete and other objects, and can ensure the personal safety of the rescued in a timely and effective manner, while reducing the pain of the rescued and firefighters. The rescue pressure is of great significance to the rescue work in such unexpected situations.

Commonly used sawtooth cutting tools have the following ways of moving the blade teeth, such as fixed-axis circular rotation, fixed-axis circular swing, and horizontal linear motion. The objects move relative to each other under a certain pressure, so that the surface of the object to be cut is cut, and so on, until the object to be cut is completely cut off.

In the process of cutting metal, concrete and other materials, since the deformation of the material is very small, it is negligible compared with the displacement of the cutter teeth. Under a certain pressure, the surface of the object is directly peeled off by the saw teeth in the form of chips or debris; During the process of objects (such as human body, clothing, etc.), when the knife teeth touch the surface of the soft object, when the movement range of the knife teeth is small, the surface of the soft object moves with the knife teeth and forms a small bulge before the saw teeth, because the knife teeth There is no relative friction between the surfaces of the objects in contact with it, and the surface of the object has not been cut. As the teeth continue to move, the surface of the object also moves with the teeth, and the deformation of the surface of the object increases accordingly. When the deformation exceeds its limit, The surface of the soft object cannot continue to move with the knife teeth, and there is a relative movement between the two to cut.

Therefore, during cutting, if the motion amplitude of the blade teeth is less than the limit of skin deformation, there will be no relative cutting motion between the cutting edge of the blade teeth and the contacting skin surface. If the simple knife teeth move in one direction and small, although it can guarantee that it will not damage the skin, it cannot effectively cut metal and other objects. The surface is only deformed and not cut, although objects such as metals can be chipped in the process.

Although cutting with a small reciprocating movement of the knife can ensure the safety of the human body, the cutting efficiency is low. If the movement of the knife is adjustable, different sizes of the movement of the knife can be selected according to the distance between the cutting position and the human body, and rescue can be taken into account. efficiency and safety.

Contents of the invention

The object of the present invention is to provide an amplitude-modulated safety saw for emergency rescue, which can be used to quickly rescue the rescued while ensuring the personal safety of the rescued, thereby reducing the pain of the rescued and the firefighters. rescue pressure.

The object of the present invention is achieved as follows: an amplitude modulation type safety saw, including five parts: a housing, a transmission mechanism, an amplitude adjustment mechanism, a saw blade clamping device and a retractable saw bow.

The housing includes a left shell, a right shell, an upper shell, a lower shell, a front shell, a rear shell and a handle, and the left shell and the right shell are provided with a chute for accommodating and fixing the amplitude adjustment shaft .

The motor support of the transmission mechanism, the gear shaft support and the short sliding shaft support and the long sliding shaft support of the amplitude adjustment mechanism are fixed on the left shell and the right shell by screws; The rotation of the motor shaft is transmitted to the pinion shaft, and the gear part of the pinion shaft meshes with the bull gear. The pin shaft seat is fixed on the bull gear, the eccentric pin is assembled on the pin shaft seat, and the slider A is installed on the eccentric pin.

In the described amplitude adjustment mechanism, a chute is installed on the short sliding shaft, and the two ends of the short sliding shaft are matched with the round holes of the short sliding shaft support, and the pin shaft seat, eccentric pin, slider A, chute, short sliding The shaft and the short sliding shaft support form a crank double-slider mechanism. During the rotation of the motor, the short sliding shaft performs reciprocating linear motion; the middle part of the long sliding shaft is equipped with a cylindrical pin and slider B, and the cylindrical parts at both ends cooperate with the long sliding shaft bracket; One end of the fork-shaped swing rod is connected with the short sliding shaft through a cylindrical pin, and the slotted part at the other end cooperates with the slider B; an amplitude adjustment shaft is installed at the position between the short sliding shaft and the long sliding shaft of the fork-shaped swing rod. The slider C that matches the U-shaped groove of the fork-shaped swing rod is installed on the adjustment shaft. The slider C is positioned through the sleeve, and the amplitude adjustment shaft can be fixed on the left and right shells through the pressure block and the wing nut. Any position of the slot; by adjusting the position of the amplitude adjustment axis, the linear displacement of the short sliding axis can be amplified or reduced by using the fork-shaped swing rod and then transmitted to the long sliding axis to realize the amplitude adjustment.

In the saw blade clamping device, the connecting sleeve is connected to one end of the long sliding shaft, and a right pressing block and a left pressing block are installed in the connecting sleeve through a cylindrical pin, and the saw blade is installed between the right pressing block and the left pressing block , and tighten the right and left pressure blocks through screws to fix the saw blade.

The retractable saw bow includes a saw bow pressure plate, a saw bow slide bar, a saw bow pressure bar, pulleys, screws, and nuts, and the saw bow pressure plate is fixed on the upper shell; the saw bow slide bar can slide in the groove of the saw bow pressure plate , and can be fixed at any position by locking screws; the saw bow pressing rod is connected with the saw bow sliding rod through screws; the lower end of the saw bow pressing rod is equipped with a pulley through screws and nuts, which guide and support the saw blade.

The amplitude modulation safety saw of the present invention adopts the above technical scheme, and has the following advantages and characteristics:

1. By changing the position of the adjustment shaft, the linear reciprocating motion range of the saw blade can be adjusted. When the cutting position is far away from the human body, the adjustment shaft is fixed on the upper end of the chute opened by the left shell plate and the right shell plate, and the movement range is larger. Cutting to improve cutting efficiency; when cutting to a position very close to the human body, fix the adjustment shaft to the lower end of the chute opened on the left and right shells, and use a small tool movement range to cut to ensure personal safety;

2. The saw blade performs linear reciprocating motion, which can cut in a narrow space;

3. The telescopic saw bow can adjust the extension length according to the size of the rescue space, and form a good support and guide for the saw blade when it is suitable for the cutting site operation space.

Description of drawings

Fig. 1 is a front appearance structural view of the amplitude modulation type safety saw of the present invention.

Fig. 2 is a structural view of the rear appearance of the amplitude modulation type safety saw of the present invention.

Fig. 3 is a handle installation structure diagram.

Fig. 4 is a structural diagram of the amplitude modulation safety saw of the present invention without a casing.

Fig. 5 is a front structural view of the transmission mechanism.

Fig. 6 is a back view of the transmission mechanism.

Fig. 7 is a diagram of the installation structure of the bull gear.

Fig. 8 is a structural diagram of the amplitude adjustment mechanism.

Fig. 9 is a structural diagram of the saw blade clamping device.

Fig. 10 is a sectional view of the saw blade clamping device.

Fig. 11 is a structural diagram of the retractable saw bow.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings.

The invention is an amplitude modulation type safety saw used for emergency rescue, which is composed of five parts: a casing, a transmission mechanism, an amplitude adjustment mechanism, a saw blade clamping device and a retractable saw bow.

Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the shell of the safety saw includes a left shell plate 101, a right shell plate 102, an upper shell plate 103, a lower shell plate 104, a front shell plate 105 and a rear shell plate 106. , wherein the upper shell 103, the lower shell 104, the front shell 105, and the rear shell 106 are connected with the left shell 101 and the right shell 102 by screws. A handle 107 is mounted on the rear shell 106 , and round holes are opened on the rear shell 106 and the handle 107 for passing the power cord of the motor 201 . The motor bracket 202 of the transmission mechanism, the gear shaft bracket 209, the short sliding shaft bracket A303, the short sliding shaft bracket B304, the long sliding shaft bracket A308 and the long sliding shaft bracket B309 of the amplitude adjustment mechanism are all fixed to the left shell plate 101 and the right side by screws. shell plate 102 . The left shell 101 and the right shell 102 are provided with slide grooves for accommodating the amplitude adjustment shaft 313 and the pressure block 316 .

Please refer to Fig. 5, Fig. 6 and Fig. 7, the motor 201 is fixed on the motor bracket 202 by screws, the synchronous pulley A203 is installed on the motor shaft, and the retaining ring 204 is fixed by screws at the end of the motor shaft for the synchronous pulley A203 axial positioning. A synchronous pulley B206 is installed on the pinion shaft 208, and a retaining ring B207 for axial positioning of the synchronous pulley B206 is also installed at the end of the pinion shaft 208, and a synchronous belt is installed between the synchronous pulley A203 and the synchronous pulley B206 205. The pinion shaft 208 is connected to the gear shaft support 209 through a bearing 219 , the blocking piece A210 and the blocking piece B211 are used for axial positioning of the bearing 219 , and the large gear shaft 218 is connected with the large gear 212 through a bearing 220 . A counterweight 216 is installed on the bull gear 212, which is used to balance the inertia force of the reciprocating motion of the short sliding shaft 301 and the long sliding sliding shaft 307 in the amplitude adjustment mechanism. In addition, the bull gear 212 is equipped with a pin seat 213 through screws, For installing the eccentric pin 214, the eccentric distance between the eccentric pin 214 and the axis of the bull gear 212 is 2.5 millimeters, and the counterweight 216 and the pin seat 213 work together to realize the axial positioning of the bull gear 212. A slider A215 is installed on the eccentric pin.

Please refer to Fig. 8, on the short sliding shaft 301, the chute 302 cooperating with the slider A215 is installed by screws, and the cylindrical parts at both ends of the short sliding shaft 301 cooperate with the round holes of the short sliding shaft bracket A303 and the short sliding shaft bracket B304 respectively. The short sliding shaft 301 is connected with the fork swing bar 306 through a cylindrical pin A305. The end of the fork-shaped swing link 306 is mounted with a tension block 312 by screws. A cylindrical pin B310 is installed in the middle part of the long sliding shaft 307, and a slide block B311 is installed on the cylindrical pin B310, and the U-shaped groove of the fork-shaped swing bar 306 cooperates with the slide block B311. The cylindrical parts at both ends of the long sliding shaft 307 are matched with the circular holes of the long sliding shaft bracket A308 and the long sliding shaft bracket B309 respectively. A range adjustment shaft 313 is installed between the short sliding shaft 301 and the long sliding shaft 307, and a slider C314 is installed on the range adjustment shaft 313, and the slider C314 cooperates with the U-shaped groove of the fork swing bar 306. A sleeve 315 is installed on the amplitude adjustment shaft 313 for the axial positioning of the slider C314. A pressure block 316 and a butterfly nut 317 are also installed on the amplitude adjustment axis 313. Tighten the wing nut 317 so that the amplitude adjustment axis 313 The square end and pressing block 316 of the left shell plate 101 and the chute of the right shell plate 102 are pressed respectively, and the amplitude adjustment shaft 313 can be fixed in any position in the chute of the left shell plate 101 and the right shell plate 102. One end of the long sliding shaft 307 is equipped with a saw blade clamping device.

Referring to FIG. 9 and FIG. 10 , the saw blade clamping device includes a saw blade 401 , a connecting sleeve 402 , a right pressing block 403 , a left pressing block 404 , a screw 405 , a cylindrical pin 406 and a set screw 407 . The connecting sleeve 402 is connected with the long sliding shaft 307 through threads, and the right pressing block 403 and the left pressing block 404 are installed inside the connecting sleeve 402 through cylindrical pins 406 . When clamping the saw blade 401, insert the saw blade 401 between the right pressing block 403 and the left pressing block 404, and align the round holes on the saw blade 401 with the holes on the right pressing block 403 and the left pressing block 404, and then screw in the screws 405 and tightened, the right pressing block 403 and the left pressing block 404 clamp the saw blade 401 by the pulling force of the screw 405.

Please refer to FIG. 1 and FIG. 11 , the retractable saw bow includes a saw bow pressure plate 501 , a locking screw 502 , a saw bow slide bar 503 , a saw bow press bar 504 , a pulley 505 , a screw 506 and a nut 507 . The saw bow pressing plate 501 is fixed on the upper shell plate 103, the saw bow sliding rod 503 is installed in the groove of the saw bow pressing plate 501, and one end of the saw bow sliding rod 503 is connected with the saw bow pressing rod 504 through a screw. The lower end is equipped with a pulley 505 through a screw 506 and a nut 507, and a groove is provided on the pulley 505. After the nut 507 is loosened, adjust the position of the screw 506 in the chute to ensure proper contact between the groove of the pulley 505 and the saw blade 401, so that the pulley 505 can guide and support the saw blade 401 well. A locking screw 502 is installed on the saw bow pressing plate 501. After the locking screw 502 is loosened, the saw bow sliding bar 503 can expand and contract in the groove, and the locking screw can be tightened after the saw bow sliding bar 503 is pulled to the desired proper position. 502 for fixing.

In the amplitude modulation safety saw according to the present invention, after the power switch is turned on, the timing belt pulley A203 installed on the output shaft of the motor 201 drives the pinion shaft 208 to rotate through the timing belt 205 and the timing belt pulley B206, and the pinion shaft 208 drives the large gear 212 Rotate, the large gear 212 drives the eccentric pin 214 to move as a crankshaft through the pin shaft seat 213, and under the guidance of the circular holes of the short sliding shaft bracket A303 and the short sliding shaft bracket B304, the eccentric pin 214 passes through the slider A215 and the chute 302 Drive the short sliding shaft 301 to reciprocate along the axial direction. During the reciprocating movement of the short sliding shaft 301, the cylindrical pin A305 drives the fork-shaped swing bar 306 to swing around the amplitude adjustment shaft 313, and at the same time, the fork-shaped swing bar 306 drives the long sliding shaft 307 to move through the slider B311 and the cylindrical pin B310. Under the guidance of the round holes of the shaft bracket A308 and the long sliding shaft bracket B309, the long sliding shaft 307 also reciprocates along the axis, so that the long sliding shaft 307 drives the saw blade 401 to reciprocate and linearly move through the saw blade clamping device to cut.

In the present invention, according to the size of each related parts such as the chute on the designed left shell plate 101 and the right shell plate 102, the length of the U-shaped groove on the fork swing bar 306, adjust the position of the amplitude adjustment shaft 313 in the chute. The position can make the reciprocating motion range of the saw blade 501 continuously adjustable between 1 mm and 25 mm. According to actual cutting experiments, when the reciprocating motion frequency is about 20-30 Hz and the amplitude is less than 2.5 mm, the saw blade 401 will generally not cause harm to the human body when it touches the skin. Engraved on the edge of the chute of the left shell 101 and the right shell 102 corresponds to the reciprocating safety range of the saw blade of 2.5 mm, the position above the scale corresponds to a larger range, and the position below the scale corresponds to a smaller safety range, so as to facilitate rescue During the process, the saw blade movement range is set according to the cutting position. When adjusting the range of motion of the saw blade 401, first loosen the wing nut 317, then push the range adjustment shaft 313 along the chute to the desired position, then tighten the wing nut 317 again to fix the range adjustment shaft 313, that is, complete the range of motion of the saw blade 401 adjustment.

The amplitude-modulated safety saw of the present invention can be made into serialized products to meet the needs of different rescue occasions. For example, a small safety saw can be developed, which can be used for rescue when fingers, arms and other parts are caught by thinner steel bars and other objects; For rescue in serious car accidents and earthquake disasters, high-power safety saws can be made, and special saw blades can be customized to meet the needs of rescue sites.

Claims (4)

1. An amplitude-modulated safety saw for emergency rescue, characterized in that it consists of a housing, a transmission mechanism, an amplitude adjustment mechanism, a saw blade clamping device and a retractable saw bow; The housing includes a left shell, a right shell, an upper shell, a lower shell, a front shell, a rear shell and a handle, and the upper shell, the lower shell, the front shell, and the rear shell are connected with each other by screws. The left shell is connected to the right shell, the handle is fixed to the rear shell with screws, and the left shell and the right shell are provided with a chute for accommodating and fixing the amplitude adjustment shaft; The motor bracket and the gear shaft bracket of the transmission mechanism are fixed on the left shell plate and the right shell plate by screws; the motor is mounted on the motor bracket by screws, and a synchronous pulley is installed on the output shaft of the motor, and the retaining ring A is used for axial positioning , a synchronous pulley is installed on the pinion shaft, and is axially positioned by retaining ring B, and a synchronous belt is installed between synchronous pulley A and synchronous pulley B; the pinion shaft and the large gear shaft are installed on the gear shaft bracket, and the pinion A bearing is installed between the shaft and the gear shaft bracket, and the gear shaft bracket is equipped with a block A and a block B for bearing positioning, and a retaining ring C is installed at the end of the large gear shaft; the large gear shaft is connected with the large gear through the bearing, and the large The pin shaft seat and the counterweight are fixed on the gear by screws, the eccentric pin is installed on the pin shaft seat, the eccentric pin and the counterweight are installed opposite to each other, and the slider A is installed on the eccentric pin; The short sliding shaft of the amplitude adjustment mechanism is equipped with a chute that cooperates with the slider A, and the cylindrical parts at both ends of the short sliding shaft cooperate with the round holes of the short sliding shaft bracket A and the short sliding shaft bracket B, and the short sliding shaft Bracket A and short sliding shaft bracket B are fixed on the left and right shell plates by screws, and the middle part of the short sliding shaft is connected with the fork swing bar through cylindrical pin A; the cylindrical parts at both ends of the long sliding shaft are connected with the long sliding shaft bracket A and the long sliding shaft The round holes of the sliding shaft bracket B fit together, and the long sliding shaft bracket A and the long sliding shaft bracket B are fixed on the left and right shell plates by screws; a cylindrical pin B is installed in the middle of the long sliding shaft, and a fork-shaped pin B is installed on the cylindrical pin B. The slider B matched with the U-shaped groove of the swing rod, the end of the U-shaped groove of the fork-shaped swing rod is installed with a tension block through a screw; The slider C matched with the U-shaped groove of the rod, a sleeve for positioning the slider C is installed on the amplitude adjustment shaft, and a pressure block and a butterfly nut are installed outside the sleeve 315, and the square end of the amplitude adjustment shaft and the pressure block are respectively Cooperate with the chute of the left shell and right shell; The saw blade clamping device is connected to one end of the long sliding shaft through a connecting sleeve, and the connecting sleeve is locked by a set screw; the right pressing block and the left pressing block are installed in the connecting sleeve through straight pins, and the saw blade is inserted into the Between the block and the left pressure block, the screw passes through the round hole of the right pressure block and the saw blade and is screwed into the threaded hole of the left pressure block, and the saw blade can be clamped by tightening the screw; The saw bow pressure plate of the retractable saw bow is fixed on the upper shell plate through screws, locking screws are installed on the saw bow pressure plate, the saw bow slide bar is installed in the groove of the saw bow pressure plate, and is connected with the saw bow pressure bar through the screw. To connect, the lower end of the saw bow pressing rod fixes the pulley through screws and nuts. 2. The amplitude-modulated safety saw according to claim 1, characterized in that: the fork-shaped swing rod is used to utilize the principle of leverage to amplify or reduce the straight-line reciprocating motion of the short sliding axis to the long sliding axis, and finally The movement of the saw blade is driven by the saw blade clamping device installed at one end of the long sliding shaft, and the range of the reciprocating linear motion of the saw blade can be adjusted. 3. The amplitude modulation type safety saw according to claim 1, characterized in that: the amplitude adjustment shaft can be fixed at any position of the chute on the left shell and the right shell through the pressure block and the wing nut, and can be adjusted by adjusting the amplitude. The position of the axis can realize the continuous adjustment of the reciprocating linear motion range of the saw blade within the range of 1-25mm. 4. The amplitude modulation type safety saw according to claim 1, characterized in that: a retractable saw bow is used, and the saw bow slide bar can slide in the groove of the saw bow pressure plate, and can be fixed at the desired position by locking screws , using the pulley installed at the lower end of the saw bow pressure bar to play a good role in guiding and supporting the saw blade, so as to meet the needs of different rescue occasions.