31results about How to "Not easy to heat deformation" patented technology

The invention provides a preparation process of plant fiber composite materials, which comprises the following steps: collecting plant raw materials; using a mechanical method for cutting the plant raw materials into threads; adding the plant fiber obtained after the thread cutting into thermoplastic plastics and adding coupling agents to obtain mixed materials; using a high-horsepower calendaring machine for uniformly mixing the mixed materials; and adding lubricating agents to be mixed into colloidal particles and preparing finished products of composite materials. Because of the plant fiber composite materials, the prepared finished products have the characteristics of high bending resistance intensity, weight reduction, difficult thermal distortion, small thermal contraction force, manufacture cost reduction and the like.

The invention provides an electromagnetic relay having a small number of components and a few assembly man-hours. The shaft part 27, provided at the lower end part of a movable iron member 26, is engaged with a recessed part for positioning provided at the base part of a spool 13, and the shaft part 27 of the movable iron member 26 is prevented from pulling off, capable of rotation by the magnetic pole section 24 positioned at the lower end part of the iron core 22 assembled at the spool 13.

The invention discloses a bi-component epoxy resin binder, which mainly comprises the following components in parts by weight: 40-80 parts of epoxy resin (a), 1-30 parts of polyurethane prepolymer (b), 10-30 parts of acrylic ester (c) and 1-30 parts of diluent (d). The binder is of a bi-component system, and the acrylic ester and organic peroxides are separately stored. The polyurethane prepolymer is mixed with other components at the temperature of not higher than 60 DEG C. According to the invention, the binder with improved heat resistance and high-temperature toughness is prepared by taking the polyurethane prepolymer as a toughening component through an interpenetrating polymer network (IPN) synthesis method. The binder is used for manufacturing a die for casting metal castings, and thereby, the high-temperature strength of a core mold can be increased. The invention also provides a cast mixture containing the bi-component epoxy resin binder, a cast molding body obtained from the cast mixture, a method for casting metal products by using the molding body and the castings obtained by the method.

A headlamp for vehicles, wherein a body support portion (22c) of a light source bulb (22) is slidingly engaged with an inner peripheral surface of an annular wall (24B) of a reflector (24), and the flange portion (24d) ) abuts against the rear end surface of the annular wall (24B), and in this state, the flange portion (24d) is clamped from the front and rear sides by the annular wall (24B) and the light bulb fixing member (32), thereby placing the light source The bulb (22) is fixed on the reflector (24). Three cutout holes (24m) penetrating through the annular wall (24B) are formed in front of the sliding engagement position between the annular wall (24B) and the body support portion (22c) of the light source bulb (22). The inner space of the reflecting mirror (24) is communicated with the outer space through these cutout holes (24m), and the heat inside the reflecting mirror (24) is dissipated to the outside, which can prevent the high temperature of the reflecting mirror and reduce the possibility of thermal deformation of the reflecting mirror, etc. sex.

The invention provides a radiation cross-linked polypropylene foaming material, a preparation method and applications thereof, wherein the raw materials comprise, by mass, 60-99% of polypropylene and1-40% of a radiation cross-linked polymer. The preparation method comprises: carrying out irradiation on a mixture sheet prepared from polypropylene and a radiation cross-linked polymer under an inertatmosphere, and foaming under a supercritical carbon dioxide condition. According to the present invention, the preparation method has characteristics of simpleness, convenience, high success rate, environmental protection and substantially-improved foaming temperature window, further improves the mechanical properties of the obtained foamed material, and is suitable for industrial application; and the radiation cross-linked polypropylene foaming material has characteristics of small pore size of the foamed pores, large hole density, light weight, good mechanical property, good sound insulation and noise reduction effect, no odor and environment protection.

The invention relates to a cooling device for generating a flat spraying jet. The cooling device comprises a tank for storing cooling water, and a slot for forming a spraying jet, wherein the slot is communicated with the tank through a drainage channel arranged in the tank. The cooling device further comprises a water inlet pipe component; the upper end of the water inlet pipe component is a cooling water inlet; the cooling water inlet is positioned rightly above the external of the tank; the lower end of the water inlet pipe component is a horizontal round pipe horizontally arranged in the tank; multiple small holes are formed in the two sides of the horizontal round pipe; the upper end of the drainage channel is a spraying jet inlet; the spraying jet inlet is positioned near the top of the tank; the drainage channel is communicated with the slot; the slot is formed by a fixed plate and an adjustable plate; and the width of the slot can be adjusted. The cooling device solves the problems of slow water current opening, slow water current closing and weak heat resistance in a traditional cooling device.

The present invention addresses the problem of providing a white-reflecting film that resists deflecting under heat while having exceptional reflection characteristics. The problem is overcome by a white-reflecting film that has a reflective layer A, wherein the white-reflecting film satisfies either condition (a) or condition (b) that the reflective layer A (a) comprises a thermoplastic resin composition A1 containing calcium carbonate particles in a thermoplastic resin A, the content of the calcium carbonate particles being 10-70% by mass with respect to the mass of the thermoplastic resin composition A1, or (b) comprises a thermoplastic resin composition A2 containing calcium carbonate particles in the thermoplastic resin A, and a resin that is incompatible with the thermoplastic resinA, the content of the calcium carbonate particles being 5-69% by mass with respect to the mass of the thermoplastic resin composition A2, the content of the incompatible resin being 1-40% by mass withrespect to the mass of the thermoplastic resin composition A2, and the combined content of the calcium carbonate particles and the incompatible resin being 10-70% by mass with respect to the mass ofthe thermoplastic resin composition A2. The calcium carbonate particles have an average grain size of 0.1-1.2 [mu]m. The relationship (D90 D10) / D50 <= 1.6 is satisfied, where D10, D50, and D90 are the 10%-, 50%-, and 90%-volume grain sizes, respectively, integrated from the small grain size side. The white-reflecting film has a reflectivity of at least 60%.

The invention provides a PCR heat cover assembly and a PCR instrument, which relate to the technical field of biological detection and include: a heat cover base, an optical fiber positioning seat is arranged on the heat cover base, an optical fiber is installed on the optical fiber positioning seat; A lens fixing plate and a heating module are provided; a through hole corresponding to the position of the optical fiber is arranged on the lens fixing plate, and a lens is installed on the lens fixing plate, and the through hole can be aligned with the sample hole on the sample module. The invention integrates the thermal cover with the optical system including the optical fiber and the lens, so that the thermal cover can not only prevent the evaporation of the test solution, but also carry the optical system, which reduces the volume of the PCR instrument and reduces its structural complexity.

The invention relates to the technical field of building materials and especially relates to a foaming ceramic damp-proof wood plastic plate and a preparation method thereof. The foaming ceramic damp-proof wood plastic plate provided by the invention comprises the following raw materials in parts by weight: 10-20 parts of coal gangue, 10-20 parts of ceramic tile residue, 8-18 parts of wood powder,3-9 parts of glass beads, 4-12 parts of calcined talc, 3-10 parts of fluorite, 5-15 parts of silicon carbide, 2-6 parts of expanded graphite, 2-8 parts of zirconium oxide, 1-4 parts of polypropylenefibers and 1-3 parts of antibacterial agent. The preparation method for the foaming ceramic damp-proof wood plastic plate provided by the invention comprises the following steps: (1) spray-drying andsieving; (2) mixing and quickly stirring; (3) mixing and grinding; (4) mixing and pelletizing; (5) die-filling and calcining. The foaming ceramic damp-proof wood plastic plate has excellent compression-resisting and wear-resisting properties, has damp-proof and antibacterial properties, is free from mildewing and deformation after long-term use, is long in service life and has excellent comprehensive mechanical properties. The preparation method is simple and the end product is high in quality.

The invention relates to the technical field of heaters and provides a control box for a heater and a warmer. The control box for the heater comprises a protective shell and a control piece located inthe protective shell, wherein the protective shell is used for being installed on an installation plate of the heater body. The side, close to the installation plate, of the protective shell is a heat insulation layer. According to the shape of the heat insulation layer, when the protective shell is installed on the installation plate, a first air flow channel is formed between the heat insulation layer and the installation plate. When the control box for the heater is installed on the heater body, the installation plate of the heater body and the heat insulation layer of the control box achieve dual physical heat insulation, the remarkable heat insulation effect is achieved, so that heat transmitted into the control box from the heater body is greatly reduced, and the temperature of thecontrol box is remarkably lowered. Besides, the air flow channel is formed between the installation plate of the heater body and the heat insulation layer of the control box, so that cooling is more rapid. In this way, the control box for the heater is not prone to generating thermal deformation.

The invention discloses a pruning machine, wherein a steel wire shaft (7), an upright rod (12), a switch top block (13), a main button (2), a lifting plate (8) and an inching switch (6) are arranged at the left of a motor component (5), a draw plate (10) and a sub button (4) are arranged at the right of the motor component (5), two ends of the steel wire shaft (7) are respectively connected with the right end of the main button (2) and the left end of the lifting plate (8), a rigid metal rod (9) is connected between the right end of the lifting plate (8) and the upper end of the draw plate (10), the lower ends of the draw plate (10) and the sub button (3) are hinged with a shell (11), the lifting plate (8) is sliding sheathed on the upright rod (12) sheathed by the switch top block (13), and the inching switch (6) is above the switch top block (13). The invention has the advantages that the invention can turn on and off motor with small force and can prevent thermal deformation of driving mediums caused by the heat radiation of motor.

The invention discloses a graphite modified polytricyclopentadiene PTCPD composite material and a preparation method thereof. The composite material comprises graphite and tricyclopentadiene, and the graphite and the tricyclopentadiene are polymerized into a polytricyclopentadiene / graphite composite material under the action of a catalyst. The graphite is expanded graphite or graphite oxide modified by a surfactant or a coupling agent. The graphite modified polytricyclopentadiene composite material provided by the invention solves the technical problems of insufficient rigidity and poor heat resistance of a polydicyclopentadiene material in the prior art, and through graphite modification, the composite material has better heat resistance, the surface of the material is not easy to thermally deform, and the wear resistance is enhanced. The graphite modified polytricyclopentadiene composite material also has the excellent characteristics of acid resistance, alkali resistance, brine corrosion resistance, halogen gas corrosion resistance, fatigue resistance and the like, and is wide in application range.

A cooling device capable of forming a high-density oblique jet flow, which includes a body with a rectangular box structure, including a box with upper and lower openings, an upper cover plate, and a lower bottom plate; the lower opening end of the box is a slope; the upper The cover plate is provided with a number of through holes along the length direction, and the lower base plate is provided with a number of installation through holes along the length direction; the water inlet pipe includes a straight pipe arranged horizontally, a number of vertical pipes arranged on the upper part of the straight pipe along the length direction of the straight pipe, and holes at the end of the vertical pipe. Connecting flange; both ends of the straight pipe are closed, and the lower part of the straight pipe is provided with water outlet holes along the length direction; the vertical pipe is inserted into the through hole of the upper cover; ; A number of arc-shaped drainage tubes are arranged in the box body, the lower ports are respectively connected to the nozzles, and the upper ports are located in the upper part of the box body. The invention has a reasonable structure and can quickly spray water and quickly cut off water in a very short time; its water storage structure can fully protect the device itself and its sealing parts from heat radiation, and prolong the service life.

The invention discloses a hydraulic motor with an integral output shaft. The hydraulic motor comprises a shell, the integrated output shaft, a thrust plate, a retainer plate, a plunger, a cylinder body and an end cover, wherein the integrated output shaft is sequentially equipped with a front contact section, a spherical section, a middle contact section, a synchronous section and a rear contact section from front to back in the axial direction; the front contact section is rotatably connected to the front end of the shell through a front bearing; a special-shape spring is arranged on the spherical section in a sleeving manner, and the spherical section is elastically connected with the rear surface of the retainer plate through a special-shape spring; the middle contact section is a convex ring retaining shoulder and is resisted against the front end of the cylinder body; the synchronous section is arranged in the cylinder body and is connected with the cylinder body; the rear contact section penetrates through a flow distribution plate and is rotatably connected with the end cover through a rear bearing; and a floating piston ring is arranged at the front end of the end cover, and a corrugated spring is arranged between the floating piston ring and the end cover. According to the hydraulic motor with the integral output shaft disclosed by the invention, a ball joint structure of a ball joint type output shaft is eliminated, the influence of the coaxiality on the quality and the performance of products during processing of the products can be greatly reduced, the reliability is high, the structure is simple, the hydraulic motor is mounted and maintained more conveniently.

The invention provides a radiation cross-linked polypropylene foaming material, a preparation method and applications thereof, wherein the raw materials comprise, by mass, 60-99% of polypropylene and1-40% of a radiation cross-linked polymer. The preparation method comprises: carrying out irradiation on a mixture sheet prepared from polypropylene and a radiation cross-linked polymer under an inertatmosphere, and foaming under a supercritical carbon dioxide condition. According to the present invention, the preparation method has characteristics of simpleness, convenience, high success rate, environmental protection and substantially-improved foaming temperature window, further improves the mechanical properties of the obtained foamed material, and is suitable for industrial application; and the radiation cross-linked polypropylene foaming material has characteristics of small pore size of the foamed pores, large hole density, light weight, good mechanical property, good sound insulation and noise reduction effect, no odor and environment protection.

The invention discloses flame-retardant nylon for an electric appliance control panel. The flame-retardant nylon comprises the following combined formula: nylon, a reinforcing agent, a flame retardant A, a flame retardant B, toner, a compound antioxidant, an anti-dripping agent, an antistatic agent and a surface modifier. The invention has the following beneficial effects: the reinforcing agent is added in the nylon, so that the nylon has high mechanical properties and thermal deformation temperature, is not easy to deform due to heating, and has good synergistic effect with the flame retardant A and the flame retardant B, and the flame retardant A and the flame retardant B are added and work cooperatively, so that the flame retardant A and the flame retardant B have good flame retardant effect. A relatively good flame-retardant effect is achieved under a relatively low addition amount; the antistatic nylon is suitable for a high-temperature environment, the antistatic agent is added, so that the nylon has a good antistatic effect, and the actual use effect in an electric appliance control panel is improved.

The invention relates to a cooling device for generating a flat jet stream, which comprises a tank for storing cooling water and a slit for forming the jet stream, the slit communicates with the tank through a drainage channel arranged inside the tank, and The device also includes a water inlet pipe assembly. The upper end of the water inlet pipe assembly is a cooling water inlet. The cooling water inlet is located directly above the outside of the box. There are many small holes on both sides of the pipe; the upper end of the drainage channel is the jet water inlet, which is located near the top of the box, and the drainage channel is connected with the slit, which is composed of a fixed plate and an adjustable Plate formed with adjustable slit width. The invention solves the problems of slow opening of water flow, slow closing of water flow and poor heat resistance of the existing cooling device.

Provided is a chuck table. In a pin chuck table, a plating layer that does not peel off during turning is formed on a material that is not susceptible to thermal deformation. The chuck table (30) usedin a machining device (1) for turning an upper surface (Wa) by means of a tool (64) by holding a lower surface (Wb) of a plate-shaped workpiece (W) by suction has: an outer circumferential annular wall (300) for supporting an outer circumferential portion of the lower surface of the plate-shaped workpiece by means of the annular upper surface (300a); a suction recess (301) formed on the inside ofthe outer peripheral annular wall (300) and having a lower bottom surface (301b) than the upper surface of the outer peripheral annular wall; a suction port (301c) that is formed in the bottom surface of the suction recess (301) and communicates with a suction source (36); and a plurality of support pins (304) vertically formed in the bottom surface (301b) at equal intervals in a manner of avoiding the suction port; the upper surface (304a) of the support pins and the upper surface (300a) of the outer peripheral annular wall (300) are at the same height, and plating layers (M) are formed on the side surfaces (300c, 300d) and the upper surface (300a) of the outer peripheral annular wall and on the side surfaces (304c) and the upper surface (304a) of the support pins (304).

The invention belongs to the technical field of transparent flexible circuit boards, and in particular relates to a modified coating used on the surface of a transparent covering film, a preparation method thereof, and a modified coating. The modified coating comprises the following components in mass percentage: 20-30% of zirconia; 9-30% of photosensitive resin; 0.5-1% of pentaerythritol triacrylate; 10-20% of aliphatic hydrocarbon solvent; Solvent 30‑60%. After the above-mentioned modified coating is coated on the surface of the base film layer of the transparent cover film to form a film, the temperature resistance of the base film layer of the transparent cover film can be improved, so that the base material is difficult to separate out and thermally deformed under high temperature conditions; therefore The modified coating is used on the surface of the transparent cover film to avoid fogging and improve light transmittance.

A provided hard-biomass crusher comprises a frame and a crusher shell; the frame is provided with a conveying belt; the cavity of the crusher shell is inside provided with a revolving knife roll; the revolving knife roll is disposed above the conveying belt, and the axial direction of the revolving knife roll is perpendicular to the conveying direction of the conveying belt; the sidewall of the revolving knife roll is provided with a crushing blade; the cavity of the crusher shell is inside provided with a knife-fixing frame disposed above the revolving knife roll, and one side, facing to the revolving knife roll, of the knife-fixing frame is provided with a knife-fixing strip; the revolving knife roll is in transmission connection with a driving mechanism; the frame is provided with a belt transmission apparatus in transmission connection with the conveying belt; and the rotation direction of the revolving knife roll is adverse to the conveying direction of the conveying belt. A crushing mechanism is arranged above a conveying mechanism, conveying of charged / discharged materials is finished by the same conveying mechanism, crushing of biomass is facilitated. The crushing mechanism has the effects of winnowing biomass to enable biomass to be fluffy and tearing and crushing biomass, and the condition that biomass blocks a crushing chamber is avoided.

The invention discloses a preparation method and application of a high-strength plastic pipe material. The method comprises the following steps: adding acetal resin, n-butyl acrylate and dioctyl terephthalate into a high pressure reactor; adding phthalic anhydride for high-temperature reaction; then, carrying out mixing on polypropylene, polyvinyl chloride and epoxidized soybean oil, and carryingout cold mixing with erucyl amide; adding mixture and erucyl amide into an internal mixer to be mixed with phosphoric acid tritolyl ester and pentaerythritol; finally, carrying out modeling through aconfluence core and a die head to obtain a finished product. The prepared plastic pipe material has the advantages of high tensile strength, high impact resistance, small possibility of thermal deformation and a good application prospect in building drainage pipeline engineering.

An object of the present invention is to provide a white reflective film that is not easily thermally deformed while having excellent reflective properties. This problem is achieved by a white reflective film having a reflective layer A that satisfies any one of the following a and b, a. contains a thermoplastic resin composition A1 in which the thermoplastic resin A1 is contained Contains calcium carbonate particles, the content of the calcium carbonate particles is 10% by mass to 70% by mass relative to the mass of the thermoplastic resin composition A1, or b. The thermoplastic resin composition A2 is contained in the thermoplastic resin composition A2. Resin A contains calcium carbonate particles and resins incompatible with the thermoplastic resin A, and the content of the calcium carbonate particles is 5% by mass to 69% by mass relative to the mass of the thermoplastic resin composition A2. The content is 1% by mass to 40% by mass relative to the mass of the thermoplastic resin composition A2, and the sum of the content of the calcium carbonate particles and the incompatible resin is 10% by mass to 70% by mass relative to the mass of the thermoplastic resin composition A2 % by mass, and the average particle diameter of the calcium carbonate particles is 0.1 μm to 1.2 μm, and the 10% volume particle diameter D10, 50% volume particle diameter D50 and 90% volume particle diameter D90 accumulated from the small particle diameter side satisfy (D90 ‑D10) / D50≦1.6, the reflectivity of the film is above 60%.

The invention is applicable to the technical field of composite materials, and provides a preparation method of a carbon fiber composite material and the carbon fiber composite material, wherein the preparation method of the carbon fiber composite material comprises the following steps: kneading hollow glass bead powder, epoxy resin, a microfiber material and a coupling agent to obtain a filling material; and putting the filling material into a mold, and carrying out pressure thermal forming treatment to obtain the carbon fiber composite material. According to the preparation method of the carbon fiber composite material provided by the embodiment of the invention, the hollow glass bead powder, the epoxy resin, the microfiber material and the coupling agent are used as raw materials, so that the prepared carbon fiber composite material is light in specific gravity, is not easy to thermally deform during heating and pressurizing, does not generate a secondary foaming phenomenon, and canbe used as materials of carbon fiber bicycles, badminton rackets, soles and the like.

The invention discloses an outdoor steel storage tank and a manufacturing method thereof. One problem of the conventional outdoor steel storage tank is that the hot dip zinc processing is required, wherein the thickness of the steel plates of the outdoor steel storage tank can be increased or the reinforcing plates can be welded on the steel plates in order to prevent the thermal deformation caused by the residual stress of the steel plates. In the outdoor steel storage tank provided in the invention, the flat parts of the steel plates can be stamped into concave parts or protruding parts (the protruding flanges), thereafter the steel plates can be combined together into a box, then the hot dip zinc processing can be finished.

The invention provides a clutch pressure plate which comprises a pressure plate body, long reinforcing ribs, short reinforcing ribs, pressure plate teeth, convex lugs, mounting holes, U-shaped groovesand U-shaped heat radiation through holes. The multiple pressure plate teeth are arranged on the end face of the pressure plate body. The long reinforcing ribs and the short reinforcing ribs are located on the outer sides of the pressure plate teeth. The convey lugs are evenly distributed on the outer diameter of the pressure plate in the circumferential direction, and the mounting holes are formed in the center positions of the convex lugs. The U-shaped grooves are distributed on the inner diameter of the pressure plate, the U-shaped heat radiation through holes are distributed in the middleposition of the inner ring of the pressure plate, and the U-shaped heat radiation through holes and the U-shaped grooves are sequentially arranged at intervals. By means of the long reinforcing ribsand the short reinforcing ribs, the strength of the clutch pressure plate can be improved; by means of the heat radiation grooves and the heat radiation holes, the heat radiation performance of the clutch pressure plate can be improved; the power performance of the clutch pressure plate can be improved well through the rotating directions of the long reinforcing ribs, the short reinforcing ribs and the end faces of the pressure plate teeth; and thus, the clutch pressure plate has the advantages that rigidity is large, deformation is not prone to happening, the heat radiation efficiency is high, the heat radiation effect is good, the power transmission efficiency is high, high temperature resisting is achieved, smoothness is good, and the service life is long.

The invention discloses a capacitive microphone with holes in the diaphragm, which comprises a substrate, a composite diaphragm and a back plate, the substrate is a silicon chip, the back plate is located above the substrate, and the composite diaphragm Located above the back plate, an oscillation cavity is provided between the composite diaphragm and the back plate, the composite diaphragm includes a diaphragm insulating layer and an upper electrode, and the upper electrode is located on the upper layer of the diaphragm insulating layer, so The composite diaphragm is provided with several acoustic holes, and the material of the upper electrode and / or the back plate is a nickel-based alloy; the invention also discloses a method for manufacturing a capacitive microphone with holes in the diaphragm; Acoustic holes are prepared on the diaphragm, which simplifies the processing steps, reduces the processing cost, and greatly improves the design yield through the improvement of the electrode metal.

The invention discloses a cooling device for a brushless motor of a vacuum cleaner, which includes a moving impeller wind cover, a moving impeller, a fixed impeller, and a motor casing, and the moving impeller wind cover is arranged on the outside of the moving impeller; the cooling device also It includes a motor fan cover arranged on the outside of the motor casing, the motor fan cover has an end part and a peripheral side part, a gap is provided between the peripheral side part and the motor casing, the moving impeller fan cover, the fixed An air flow channel is formed among the impeller, the motor fan cover and the motor casing. The invention can be used in various vacuum cleaner motors or similar motor structures, and has the advantages of rapidly reducing the heat of the motor, reducing the temperature of the casing, and the like.

The invention discloses a pruning machine, the left side of the motor assembly (5) has a steel wire flexible shaft (7), a vertical rod (12), a switch top block (13), a main button (2), a seesaw (8) and The micro switch (6); the right side of the motor assembly (5) has a pull plate (10) and the auxiliary button (4); the two ends of the flexible steel wire shaft (7) are connected with the right end of the main button (2) and the rocker (8) respectively. The left end is connected; a rigid metal rod (9) is connected between the right end of the rocker (8) and the upper end of the pull plate (10); the lower end of the pull plate (10) and the auxiliary button (3) are hinged on the casing (11) at the same time; The plate (8) is slidably sleeved on the vertical rod (12) with the switch top block (13); the micro switch (6) is located above the switch top block (13). The invention has the advantages that not only the motor can be turned on and off with only a small force, but also the thermal deformation of the transmission parts due to the heating of the motor can be prevented.

The invention discloses a pruning machine, wherein a steel wire flexible shaft (7), an upright rod (12), a switch top block (13), a main button (2), a lifting plate (8) and a microswitch (6) are arranged at the left of a motor component (5); a draw plate (10) and an auxiliary button (4) are arranged at the right of the motor component (5); two ends of the steel wire flexible shaft (7) are respectively connected with the right end of the main button (2) and the left end of the lifting plate (8); a rigid metal rod (9) is connected between the right end of the lifting plate (8) and the upper end of the draw plate (10); the lower ends of the draw plate (10) and the auxiliary button (3) are hinged with a shell (11) at the same time; the lifting plate (8) is slidably sheathed on the upright rod (12) sheathed by the switch top block (13); and the microswitch (6) is above the switch top block (13). The pruning machine disclosed by the invention has the advantages that a motor can be turned on and off with a relatively small force and thermal deformation of driving components caused by the heating of the motor can be prevented.