238results about How to "Won't slip off" patented technology

The invention discloses a sun-cure shed for sun-cured tobaccos, sun-cure devices and tobacco clips. The sun-cure shed comprises a shed. The shed is provided with a plurality of rows of sun-cure units, and transverse channels are arrange at the ends of the sun-cure units; a plurality of upright columns are arranged on two sides of each sun-cure unit, a plurality of slide rails are arranged on opposite sides of the upright columns, and the corresponding sun-cure devices are arranged on the slide rails on each same layer and can slide along the slide rails; the multiple tobacco clips used for clamping the tobaccos are arranged on the sun-cure devices. The sun-cure shed, the sun-cure devices and the tobacco clips have the advantages that the sun-cure shed is provided with the sun-cure devices and the tobacco clips used for clamping the multiple tobaccos, and the tobaccos can be subjected to sun-cure in a clustered manner by the aid of the sun-cure devices; the sun-cure devices can slide along the slide rails, so that the tobaccos can be fed mechanically and can be cured in an industrialized manner; the shortcoming of draping of tobacco braiding ropes is overcome, accordingly, the tobacco sun-cure density is increased as compared with a tobacco sun-cure mode implemented by the aid of the tobacco braiding ropes, and tobaccos of 82 tobacco plants can be cured in each square meter of the steel-structured shed while only tobaccos of 33 tobacco plants can be cured in each square meter of an existing standard cure shed; the production efficiency is improved, the integral cost is lowered, and the labor intensity is reduced.

A disclosed hot-air ageing test box for rubber comprises a box body, a box door and a controller at one side of the box body, and is characterized in that the box body inside comprises a test chamber, the exterior of the test chamber is coated by a heat-insulation layer, and the test chamber and the heat-insulation layer are provided with communicated air holes; a hot-air channel is arranged between the heat-insulation layer and the box body, positions, at two sides of the heat-insulation layer, of the hot-air channel are both provided with a heating pipe, and one end, opposite to the heating pipe, in the hot-air pipe is provided with a blower fan; the medial-axis position in the test chamber is provided with two rotary shafts; the periphery of each rotary shaft is uniformly provided with a group of rubber clamping plates, and each rubber clamping plate is provided with a clamping part; and the rotary shafts are connected an motor. The hot-air ageing test box for rubber is uniform in ageing temperature and capable of precisely realizing heat treatment of a stretched sample band.

The invention discloses a software robot grasping device and method. The software robot grasping device comprises an annular air bag, bending drivers and a fixed device. The annular air bag is fixedlyconnected with the center of the bottom of the fixed device. The bending drivers are located on the two sides of the annular air bag and installed at the bottom of the fixed device. The annular air bag is made of an elastomer material. The side, away from the fixed device, of the annular air bag is an open end. The annular air bag comprises an inner layer, a middle layer and an outer layer. The middle layer is of a cavity structure and annularly arranged between the inner layer and the outer layer. The inner layer performs inward squeezing for clamping under the action of compressed air. Thebending drivers are internally provided with pneumatic grid structures and are bent towards the annular air bag under the action of compressed air. The tail ends of the bending drivers are each of a fingertip simulating structure. Through holes are formed in the fixed device and communicate with the middle layer and the pneumatic grid structures correspondingly. Through the coordinate work of theannular air bag and the bending drivers, a columnar object can be efficiently and reliably grasped and clamped, and the software robot grasping device can effectively complete complicated actions suchas unscrewing, screwing, outward pulling and inward inserting in cooperation with a mechanical arm.

The invention discloses a full-contact 180-degree plate turnover machine which comprises a base, wherein two turnover mechanisms are arranged on the base; the first turnover mechanism is formed by connecting a first turnover stand, a first connecting seat, first swing rods, a first turnover driving device and a first inclined driving device; the first turnover stand is fixedly arranged on the first connecting seat, the two ends of the first connecting seat are respectively provided with the first swing rod, and two ends of each swing rod are respectively hinged with the base and the first connecting seat; a first inclined driving device is arranged on the base, and an executive component of the first inclined driving device is hinged with the first swing rod; a first turnover driving device is arranged on the base or the first swing rods, and the executive component of the first turnover driving device is connected with the first connecting seat; a first auxiliary turnover plate is fixedly arranged on the first connecting seat; the second turnover mechanism is formed by connecting a second turnover stand, a second connecting seat and an inclined turnover device, and the inclined overturn device is connected with the base; and the executive component of the inclined overturn device is connected with the second connecting seat.

The invention provides a novel steel tube machining device, and particularly relates to an adjustable steel tube joint closing device which comprises a base, a press-fitting roller fixing seat, a first press-fitting roller, a second press-fitting roller, a third press-fitting roller and a lifting support. By means of the adjustable steel tube joint closing device, press-fitting adjustment can be carried out from multiple angles, prominent load bearing capacity and press-fitting precision are achieved, the novel press-fitting rollers can be better attached to the surfaces of tubes to be machined, press-fitting force is accurate and uniform, tube joint closing efficiency and quality can be effectively improved, operation is easy, and operation safety risks are effectively lowered.

The invention discloses a combined type all-metal steel wire rope vibration isolator which is easy to disassemble, has various types of vibration isolation units with strong replaceability, variable rigidity and variable damping, reduces vibration quickly, has a simple structure and is convenient to install and maintain. The combined type steel wire rope vibration isolator mainly comprises a basic vibration isolating unit, an expandable vibration isolating unit and a buckle. The units are connected together through bolts. The vibration isolator has the characteristics of strong vibration isolation and reduction capacity in any direction, large damping, strong impact resistance capacity, good broadband vibration absorbing performance, obvious nonlinear characteristics, various combination modes and the like, is convenient to assemble and disassemble, convenient to package and easy to maintain and is suitable for mass production and single-piece character assembly. So the vibration isolator is widely applied in the fields of vibration reduction, vibration isolation and impact resistance of machinery and instruments under dynamic load.

The invention discloses a reinforced concrete girder bridge girder reinforcing structure and method. The reinforcing structure comprises a reinforcing form board, a concrete structure located in a cavity between the reinforcing form board and a to-be-reinforced girder and a prestress system arranged on the reinforcing form board, wherein the reinforcing form board includes a girder-bottom form board and two girder-side form boards; the prestress system comprises two longitudinal prestress steel strands penetrating the reinforcing form board and a plurality of first transverse prestress steel strands penetrating the girder-bottom form board, four steel anchor boxes are disposed on the to-be-reinforced girder, and the two longitudinal prestress steel strands, two second transverse prestress steel strands and the four steel anchor boxes form the annular prestress system. The reinforcing method includes the steps of firstly, prefabricating the reinforcing form board; secondly, arranging anchor parts; thirdly, hoisting and fixing the reinforcing form board; fourthly, pouring concrete; performing prestress tension. The reinforcing structure and method is reasonable in design, simple in construction, good in reinforcing effect and capable of solve various problems of existing reinforcing methods.

The invention discloses an electric transmission line erection tightener which comprises a fixed frame body, a traction support and a clamp. The traction support is provided with 1-3 traction wheel sets. Each wheel set is composed of rotating wheels and compression wheels, wherein the rotating wheels and the compression wheels are matched with one another, the rotating wheels are in transmission connection with one another, and the compression wheels are connected with a pressure pull rod connected with the traction support in a penetrating mode. A compression spring and a lever type pull rod operation mechanism are arranged on the pressure pull rod. The rotating wheels are connected with a hand-cranking mechanism through chain transmission pieces. Single-direction locking mechanisms used for preventing the rotating wheels from rotating reversely are arranged on the chain transmission pieces. The tightener is exquisite is operation, can be operated by one person, does not need ground coordination, can be stopped at any time for rest in the wire tightening process, is improved in construction efficiency by more than ten times when calculated in a man-hour mode, greatly reduces labor intensity, and especially and reliably ensures person safety of rod treading persons.

The invention discloses a tip contact type parallel electrode welding head for directly welding enameled wires in the field of resistance welding. The tip contact type parallel electrode welding head comprises a parallel mosaic electrode welding head body provided with two mosaic electrodes. The parallel mosaic electrode welding head body is provided with a body portion, an electrode tip portion and a mosaic transition portion, the body portion is a mosaic portion of the mosaic electrodes, the electrode tip portion is a portion of a parallel electrode welding head tip formed by electrode extension processing of the mosaic electrodes, and the mosaic transition portion is a portion that the mosaic electrodes are mosaicked to a mosaic and extend to the electrode tip portion. The tip contact type parallel electrode welding head has the advantages that since the two electrodes of the mosaic transition portion are thickened obviously, space between the two electrodes are enlarged obviously, tip contact angle is increased obviously, and distance is lengthened obviously, electrode tip contact force can be increased remarkably, stability and impact resistance of the welding head tip are improved, and service life of the welding head is prolonged effectively.

The present invention provides an intervertebral fusion apparatus for positioning and combining vertebrae, which use a solidifiable material and an intervertebral fusion cage concurrently. By diffusing the solidifiable material from the top or bottom surface of the intervertebral fusion cage, the contact area with vertebrae and hence the stability can be increased. In addition, the intervertebral fusion cage provided by the present invention can further include a wing member connected pivotally on the side and operated concurrently with the solidifiable material to change the shape and thus avoid slipping off the operation opening. By using the intervertebral fusion apparatus, the stability of the intervertebral fusion cage during and after surgeries can be improved effectively. Thereby, the success rate and safety of vertebral fusion surgeries can be increased.

The invention discloses a seat face sleeve and carpet cloth installing and fixing device. The seat face sleeve and carpet cloth installing and fixing device is provided with a framework attached to an automobile body and a seat. The framework is provided with grooves, and a buckle is arranged on one side of each groove. The device is provided with multiple first section bars connected with a seat face sleeve, reverse buckles are arranged on the two sides of the lower end of each first section bar, and the reverse buckle on one side of the lower end of each first section bar can be matched with the corresponding buckle. The device is provided with multiple second section bars connected with carpet cloth, and the lower ends of the second section bars are provided with barbs capable of being matched with the reverse buckles on the other sides of the lower ends of the first section bars. The seat face sleeve and carpet cloth installing and fixing device has the beneficial effects that the structure is simple, cost is low, assembly is easy and quick, the seat face sleeve and the carpet cloth can achieve a tight covering effect, and the device is unlikely to be damaged, economical, durable and convenient to detach and wash. The device is particularly suitable for installing and fixing the seat face sleeve and the carpet cloth of a saloon car and other high-grade automobiles.

The invention relates to a tensioning device. Wherein, the framework of tensioning device has a tensioning operation section and a releasing retraction section for tensioning and releasing size ribbon; the back axle of framework has a rotational retraction brake plate and a double twisted spring of brake plate; the front part of handle has a eccentric protrude arc for pushing brake plate and small baffle plate; the main axle has a retraction disc with ratchet wheel at two ends and a retraction device to retract size ribbon via swirl spring; the big baffle plate of handle has a big baffle plate and a double twisted spring that forcing big baffle plate; the big baffle plate has press key and the compress feet for initiating the retraction brake plate. Said invention has the function of general tensioning device that bounding goods and it can automatically retraction size ribbon while it can freely adjust the retraction speed or stop retraction in the process of retracting size ribbon, to avoid metallic hook rebounding. And it has simple operation and high safety.

The invention relates to a plastic handle assembling machine which comprises a plastic handle clamping mechanism, a workpiece clamping mechanism and a control device. The plastic handle clamping mechanism and the workpiece clamping mechanism are arranged on an installing platform; the workpiece clamping mechanism comprises a transverse movement mechanism, a vertical movement mechanism, a clamping table and a clamping table swing mechanism; and the plastic handle clamping mechanism comprises a fixing support, a movable type clamping device and a pushing air cylinder. According to the aim, the plastic handle assembling machine is provided, a plastic handle and a workpiece are clamped by the machine, the workpiece and the plastic handle are assembled through a driving device, and therefore it can be guaranteed that the handle is even in stress and free of slippage in the assembling process, the operation difficulty and the labor intensity of workers are reduced, and the product quality and the production efficiency are improved.

The invention belongs to the technical field of pressure casting and discloses a cushion cylinder for a hot-chamber die casting machine. The cushion cylinder for the hot-chamber die casting machine comprises a cylinder body; the left end of the cylinder body is provided with a left end cover in a matched mode; the right end of the cylinder body is provided with a right end cover in a matched mode; a piston is arranged in a piston cavity inside the cylinder body in a matched mode; the piston is fixedly connected with a piston rod; the piston rod penetrates through the left end and is in sliding connection with the left end cover; a cushion cover is arranged on the right end cover and comprises an outer housing and an inner housing; an air channel communicated with the piston cavity is formed between the outer housing and the inner housing; a through hole is formed in the position, inside the inner housing, of the right end cover and is connected with an airbag in a covering mode; a cushion chamber is formed between the airbag and the inner housing. When the piston rightwards moves in the piston cavity, part of compressed air enters the cushion chamber through the air channel, so that the airbag is inflated and expands, when the piston rightwards moves to the limitation position, the piston moving at a high speed impacts on the airbag, cushioning is formed, and the piston decelerates gradually. Through the cushioning mode, the piston is prevented from directly colliding with the right end cover, and the cylinder is prevented from being destroyed.

The invention relates to the field of automobile towing tools, in particular to a winch device for automobile towing and a using method of the winch device. The winch device comprises a connecting frame fixedly connected to a vehicle frame through a bolt assembly, a connecting plate is fixed on the connecting frame, a winding block for winding a traction steel wire rope is fixed on the connectingplate, a pre-tightening mechanism for pre-tightening the traction steel wire rope wound on the winding block is arranged on the connecting frame, and a pressing mechanism is arranged on the connectingplate, and is in drive connection with the pre-tightening mechanism; the pressing mechanism is in drive connection with a rope clamping mechanism, the traction steel wire rope penetrates the wire clamping mechanism and is wound on the winding block, and the rope clamping mechanism is used for clamping and fixing the traction steel wire rope. According to the winch device for automobile towing andthe using method of the winch device, compression force of the traction steel wire rope is automatically increased by the pre-tightening mechanism and the pressing mechanism under the condition thatthe traction steel wire rope is pressed greatly, so that the traction steel wire rope cannot slip; and moreover, the whole winch device is simple and convenient to mount and dismount, the structure issimple, and practicability is improved.

The invention relates to an easy-to-clamp surface spraying device for a high-speed wire rod guide wheel. The device includes an operation platform, a sliding groove, a connecting frame, a regulating tube, a clamping slider and a cleaning groove. One side of the operating platform is fixed with a paint guide rail which is perpendicular to the clamping guide rail. The sliding groove is arranged on the side, away from the paint guide rail, of the operation platform, the side, away from the operation platform, of the sliding groove is provided with the slider, the connecting frame is fixed on theside face of the operation platform, the inner side of the paint guide rail is provided with a through hole, and the side, away from the paint guide rail, of the through hole is provided with a fastening handle. According to the easy-to-hold surface spraying device for the high-speed wire rod guide wheel, springs and protective pads form a combined clamp mechanism, the high-speed wire rod guide wheel directly presses the springs through the protective pads, since the protective pads are soft, the high-speed wire rod guide wheel can not be damaged by the protective pads, the opposite acting force of the springs directly acts on the surfaces of the two ends of the high-speed wire rod guide wheel so that the high-speed wire rod guide wheel can be clamped tightly and fastened. The device facilitates clamping of the high-speed wire rod guide wheel.

The invention provides a shaft coupling used between a motor rotating shaft and a spline connecting shaft. The shaft coupling used between the motor rotating shaft and the spline connecting shaft comprises a left sleeve chuck, a right sleeve chuck, a shaft sleeve and a conical sleeve; a positioning key which is fixed in the axis direction is welded on the outer surface of the left sleeve chuck; the positioning key is clamped in a positioning groove in the motor rotating shaft; the shaft sleeve is connected with the left sleeve chuck; internal threads are formed on the inner side of the right sleeve chuck and are matched with external threads on the shaft sleeve; the two ends of the shaft sleeve are open; the inside diameter of the opening in one end, which is in contact with the left sleeve chuck, of the shaft sleeve is smaller than that of the opening in the other end of the shaft sleeve, so that a conical through hole is formed; the conical sleeve which is matched with the conical through hole of the shaft sleeve is arranged in the shaft sleeve; a shaft hole is formed in the conical sleeve; tightening openings are formed in the end surfaces of the left sleeve chuck and the right sleeve chuck; the inside diameters of the tightening openings are greater than the inside diameter of the shaft hole and smaller than the maximum diameter of the conical sleeve; and the conical sleeve is extruded to the shaft sleeve through the tightening openings by rotating the right sleeve chuck. The shaft coupling provided by the invention is simple in structure; force is applied to the spline connecting shaft uniformly; a fixing effect is good.

The invention provides a desktop type round hole display fixing bracket. The desktop type round hole display fixing bracket comprises a clamping base, a lower arm section, an upper arm section and a hinge assembly. The clamping base comprises a fixed column matched with a round hole in a table board in an inserted mode and a locking device used for fixedly connecting the fixed column with the table board. The lower end of the lower arm section is pivoted to the clamping base. A first spring is arranged between the clamping base and the lower arm section. The first spring is compressed or stretched to tend to force the lower arm section to raise up to provide supporting force for the upper arm section and a display. The desktop type round hole display fixing bracket is provided with the clamping base matched with the round hole in the table board in the inserted mode. After fixation, the clamping base and the table board are connected more firmly, and the round hole of the table board achieves the more stable fixing effect on a supporting frame. After long-term use, the desktop type round hole display fixing bracket cannot slip off, occupies a small space and brings great convenience to life or office work of people.

A wringing device for cleaning elements of wet and moist mops, the wringing device having a liquid-permeable receptacle (1) which can be affixed to a container, and in which a cleaning element can be wrung out by the exertion of pressure, the receptacle having deformable wall parts (3) and the inside width of the receptacle changing when the cleaning element is pressed in due to the effective force of pressure, wall parts being formed from spring elements (3) with convex curvature, which can be deformed by exertion of pressure for the purpose of enlarging the inside width.

The invention discloses an iron wire continuous cutting and bending all-in-one machine for bundling. The iron wire continuous cutting and bending all-in-one machine comprises a bending assembly, a clamping assembly and a cutting assembly. Through linkage arrangement of the bending assembly and the cutting assembly, iron wires penetrate through the cutting assembly and then are clamped on the clamping assembly, a bending rod and the cutting assembly are driven by an air cylinder to conduct linkage operation, the iron wires are cut through the cutting assembly at first, the cutting assembly is reset through a reset spring, then the bending rod applies radial acting force to the iron wires to bend the iron wires, the technical problem that iron wires need to be bent manually after being cut in the background art is solved, and the structure is simple.

The present invention relates to a pleating device, in particular to a pleating device which can be assembled on a common sewing machine. The technical problem to be solved by the present invention is how to overcome the defects that: pleats produced by the prior pleating device are uneven, and the widths of the pleats are inconvenient to be adjusted. Therefore, the present invention comprises a transmission mechanism, a crank-slider mechanism and a feeding shovel blade which are connected in sequence, wherein, the rotation provided by a power source is transmitted to the crank-slider mechanism by the transmission mechanism, and transformed into the reciprocating motion of the feeding shovel blade by the crank-slider mechanism. The present invention is characterized in that: the feeding shovel blade consists of a main shovel blade and a minor shovel blade which are mutually matched up and down for clamping the raw materials to be processed. After the proposal is adopted, the present invention has the advantages of simple structure and convenient use, and is suitable to produce the pleats in various widths, which is an ideal upgrading product for the prior pleating device.

The invention discloses a simple and rapid anchoring method and apparatus of a distributive sensing optical cable. A large cylinder is nested in a flange, and hollow circular truncated cones are fixed at two ends of the large cylinder; a spring is arranged in the large cylinder, metal clamping pieces are fixed at two ends of the spring, the other end of each metal clamping piece is connected with a small cylinder, and the flange, the large cylinder, the spring, the metal clamping pieces and the small cylinder are coaxial; and a loose-sleeve distributive sensing optical cable passes through a circular hole on the peripheral edge of the flange to play an effect of temperature compensation and alignment. According to the optical cable anchoring apparatus, the elastic force is controlled by virtue of a stiffness coefficient of the spring, the stress on a cross section of the loose-sleeve distributive sensing optical cable is uniformly distributed, and the optical cable is firmly installed; and moreover, the simple and rapid anchoring apparatus is small in size, simple in production, easy to operate, rapid to install, low in cost, small in micro-bend loss of an optical path, reliable in anchoring effect, suitable for the distributive sensing cables of different sizes, structures and cladding materials, and can firmly fix the distributive sensing optical cable on concrete, inside a rock and earth mass or on the surfaces of steel structures and concrete structures.

The invention relates to a forest fallen leaf cleaning vehicle, belongs to the field of environmental protection devices, and particularly relates to a device which picks up fallen leaves by the aid of hooked needles, collects and treats the picked up fallen leaves. The cleaning vehicle has the advantages that fallen leaves in a forest can be collected and treated, manual sweeping by traditionaltools is omitted, a plurality of hooked needles are arranged on a front rotating shaft, an unidirectional cleaning range is wider, the cleaning vehicle is provided with two groups of hooked needles, so that the fallen leaves are thoroughly cleaned, missing of fallen leaf cleaning is avoided, the fallen leaves are picked up by the hooked needles, burden of bend down picking up of workers is reduced, barbs are arranged on the hooked needles, the fallen leaved stuck on the ground can be picked up and cannot slide out, the fallen leaves on the hooked needles are more conveniently and rapidly takendown by the aid of a front scraper and a rear scraper, fallen leaf taking frequency of the front scraper and positions of the hooked needles are coordinated by bumps, and a storage box suffered fromjolting does not easily slip by the aid of a rear inclined bump of a frame.

The invention relates to the technical field of water blockage equipment, and discloses a water injection type water blockage air bag and an application method thereof. The application method of the water injection type water blockage air bag specifically comprises the following steps that firstly, a three-phase power source is connected, an air compressor is adjusted, an air pressure meter of theair compressor is checked to the normal air pressure, a water pressure vehicle and an air pump get ready, the seal performance of an air nozzle and a pipe connector is checked, and a medical oxygen meter air entrapping pipe and the air compressor are connected to serve as an emergency air source; and secondly, a diver enters a water conveying pipeline for underwater groping, and whether impurityburrs exist in the water conveying pipeline or not is checked. Water is injected into an air bag body, the weight of the air bag body and the water pressure to the side wall of the air bag body from water are increased, friction force between the air bag body and the inner wall of the water conveying pipeline is increased, accordingly, the capability of bearing the water pressure under the actionof a high water head is improved, water injection is equivalent to reduction of internal space of the air bag body, accordingly, the inflation amount is reduced, the effect of lowering the gravity center of the air bag body is achieved, and stability of the air bag body is improved.

The invention relates to the work of oil recovery operations of oilfields, in particular to a signal transmission method for a downhole measurement and control system. The signal transmission is achieved through carrying out close connection and sealing on cable cores, a pressing cap, a wire pipe, a spacing ring, a sealing ring, a cable, an oil tube, a guard plate, a rubber protection block, screws, a coupling, an oil tube short joint, a connecting plate, a pressure plate, a sensor, a guard pipe and a steel belt throat hoop; and according to the signal transmission method, the cable or an outer armor of a capillary tube is adopted to be closely connected with the oil tube and serve as a ground wire for signal transmission, and the single-core signal transmission is achieved; the cable is fixed with the sensor by adopting the connecting plate and the back plate which are provided with unique designs, and the cable is fixed with the oil tube by adopting a guard plate assembly and a steel belt, so that the fixation of the cable is achieved; and the sealing of a wellhead is achieved by adopting a wire pipe sealing method with a unique design.

The invention discloses an integrally-formed carbon fiber spoke and a preparation method thereof. A carbon fiber core body and a first metal piece and a second metal piece at the two ends of the spoke are prepared, the centers of the two metal pieces are provided with axial through holes, the through holes are matched with the carbon fiber core body, and the end of the first metal piece is provided with an annular boss; the carbon fiber core body penetrates through the through holes of the first metal piece and the second metal piece, and the first metal piece and the second metal piece are arranged at the two ends of the carbon fiber core body; the carbon fiber core body and the metal pieces at the two ends are wound and coated by using the carbon fiber prepreg to form a semi-finished product; and the wound and coated semi-finished product is putted into a forming mold for heating and forming. The metal pieces are wound and coated by the carbon fiber prepreg so that a sandwich structure is formed between the metal pieces and the carbon fiber material to enlarge the bonding interface between the spoke body and the inner and outer surfaces of the metal pieces at the two ends, the bonding force between the spoke body and the metal pieces at the two ends is greatly improved, and it is ensured that the spoke body and the metal pieces cannot slip off.

The invention relates to a device for slicing rhizoma dioscoreae. The device comprises a shearing part and a blade angle adjusting mechanism, wherein the shear part comprises an upper shear plate and a lower shear plate which are oppositely arranged in parallel and can be relatively close to or away from each other; a plurality of upper blades and lower blades which can be mutually sheared and closed are separately and uniformly distributed on the lower end face of the upper shear plate and the upper end face of the lower shear plate; the upper blades and the lower blades are separately and rotationally connected with the upper shear plate and the lower shear plate by a rotating shaft perpendicular to the lower end face of the upper shear plate and the upper end face of the lower shear plate; the blade angle adjusting mechanism comprises a first linking rod and a second linking rod; one end of each upper blade and one end of each lower blade are separately hinged to the first linking rod and the second linking rod; the upper shear plate is parallel to the lower shear plate, and an upper clamping groove and a lower clamping groove are separately formed in the side faces, close to the first linking rod and the second linking rod, of the upper shear plate and the lower shear plate along the length directions of the upper shear plate and the lower shear plate; a first clamping part extending from the first linking rod is clamped with the upper clamping groove in a sliding manner; and a second clamping part extending from the second linking rod is clamped with the lower clamping groove in a sliding manner.