65 results about "Polymer concrete" patented technology

The invention discloses a lithium slag based salt corrosion resistant concrete pole and a preparation method thereof. The pole is made of lithium slag based geopolymer concrete. The concrete comprises the following components in parts by mass: 20-30 parts of dealkalized red mud, 15-25 parts of activated lithium slag, 10-15 parts of slag, 5-8 parts of silica fume, 6-10 parts of magnesium phosphate cement, 12-18 parts of a composite alkali activator, 25-35 parts of machine-made sand, 40-50 parts of gravel, 0.4-0.6 part of a polycarboxylic acid water reducer, 0.8-1.2 parts of composite fibers, 2-3 parts of a salt corrosion-resistant corrosion inhibitor and 25-35 parts of water. The outer surface of the electric pole is coated with an organic silicon-fluorosilicone resin hydrophobic coating; the salt-corrosion-resistant corrosion inhibitor is prepared by compounding nano silicon dioxide, a hydrotalcite precursor and a triphosphonic acid-based corrosion inhibitor, the concrete pole is obtained through the processes of red mud and lithium slag pretreatment, raw material mixing, centrifugal forming, curing and surface treatment, and has excellent salt corrosion resistance and mechanical property.

The invention relates to the technical field of geotechnical engineering reinforcement, in particular to a novel anchor rod for reinforcing dangerous rock in a cold region and an intelligent monitoring and early warning system. Comprising an anchoring system, a heating system and a drainage system, the anchoring system is used for connecting an anchor rod with a dangerous rock, the heating system is used for heating the vicinity of the anchor rod, and the drainage system is used for draining water; the part, anchored into the dangerous rock, of the anchor rod for reinforcing the dangerous rock in the cold region is divided into anchoring sections and heating drainage sections, the anchoring sections and the heating drainage sections are arranged in a staggered mode, and the anchor rod for reinforcing the dangerous rock in the cold region is obliquely upwards arranged in the dangerous rock body at a certain anchoring angle. According to the novel anchor rod for reinforcing the dangerous rock in the cold region and the intelligent monitoring and early warning system, the anchor rod system integrates multiple functions, and the limitation of a traditional anchoring technology is broken through; through the innovative design of the barb structure and the expansive polymer concrete, the stability and durability of the anchor rod are improved, and the anchor rod can adapt to temperature and moisture changes in a cold or humid environment.

The invention discloses a hybrid fiber reinforced geopolymer concrete dynamic growth factor prediction method and system, and relates to the technical field of composite materials, and the method comprises the steps: obtaining an initial peak stress growth factor based on the ratio of dynamic peak stress to quasi-static peak stress under a given strain rate; based on the ratio of the dynamic elastic modulus to the static elastic modulus, obtaining a dynamic increasing coefficient of the elastic modulus of the concrete; under the condition that the size of the static compression test piece is consistent with the size of the dynamic compression test piece, analyzing the influence of a fiber combination mode, a fiber type, a fiber mixing amount and a strain rate on the dynamic performance of the test piece; introducing fiber characteristic parameters to carry out secondary fitting on the initial peak stress growth factor to obtain a corrected peak stress growth factor; and fitting the dynamic increase coefficient of the elastic modulus of the concrete through a linear function to obtain a corrected elastic modulus increase factor and a critical strain rate. According to the method, the dynamic growth factor of the hybrid fiber reinforced geopolymer concrete can be accurately predicted, so that the impact resistance of the material is obtained.

The application discloses a kind of hybrid fiber reinforced geopolymer concrete creep test method and system, it is related to hybrid fiber reinforced geopolymer concrete technical field, preparation different fiber species creep test piece;Different loading conditions are set, and the compression creep test is carried out to the creep test piece;In the compression creep test process, the creep data of each creep test piece is collected, and the creep data is handled;Based on the creep data after processing, the creep performance of hybrid fiber reinforced geopolymer concrete is evaluated.The application focuses on the creep behavior of GPC and HFGPC under long-term compression load.By analyzing the influence of fiber type, axial stress ratio and confining pressure level on creep characteristics, the deformation law of fiber reinforced composite materials under long-term service condition is revealed, which provides a theoretical basis for the engineering application of HFGPC and a reference for the prediction of its creep coefficient.

This invention relates to Joule-cured multi-component solid waste polymer concrete and its preparation method. It utilizes Joule heat generated by electricity to cure the polymer, significantly improving curing efficiency and the mechanical properties of the polymer concrete. If the water-cement ratio in the concrete raw materials is not higher than 0.3, nano-carbon fibers need to be added to the raw materials; if the water-cement ratio is higher than 0.3, nano-carbon fibers are not initially added. Carbon fibers, or a mixture of carbon fibers and nano-carbon fibers, are uniformly dispersed in water before being added to a uniformly mixed precursor powder. Finally, steel fibers are added and mixed uniformly to form a slurry with a multi-level conductive network. The raw materials include: precursor powder, alkali activator, steel fibers, carbon fibers, and water. The steel fibers account for 0.5~2.5 vol% of the precursor powder, the carbon fibers for 0.4~1.0 vol%, the nano-carbon fibers for 0~0.10 vol%, and the water for 0.2~0.43 wt% of the precursor powder.

Polymer concrete as a material consisting of fillers, a binder, and a hardener, wherein the weight fraction of the fillers is between 75% and 95%, the weight fraction of the vegetable oil or natural resin is between 3% and 18%, and the weight fraction of the hardener is between 2% and 15%, wherein the fillers comprise quartz flour with a weight fraction of 10% to 20%, sand with a grain size of 0 mm to 2 mm and a weight fraction of 20% to 30%, gravel with a grain size of 2 mm to 8 mm and a weight fraction of 30% to 40%, and gravel with a grain size of 8 mm to 16 mm and a weight fraction of 20% to 40%, characterized in that the binder consists of chemically modified vegetable oil or chemically modified natural resin, wherein the binder is triglycerides from vegetable oil or terpenes from natural resin, preferably from rosin. are modified to acrylates or polyols or epoxy resins or polyesters, wherein modified polyols are hardened by the addition of isocyanates or polyisocyanates, and / or wherein polyesters are hardened by the addition of polyols and / or wherein native acrylates or native unsaturated polyesters are polymerized by radicals.

The utility model discloses a waste glass sand geopolymer concrete chemical corrosion resistance experiment device which comprises a soaking pool and a control panel installed on the side face of the soaking pool, a plurality of soaking cavities are formed in the soaking pool and distributed in an array shape, placing boxes are arranged in the soaking cavities, and the placing boxes are arranged in the soaking pool. The top of the containing box is open, a plurality of liquid inlets are formed in the lower portion of the side face of the containing box, and a positioning frame is installed on the upper side of the soaking pool. According to the chemical corrosion resistance experimental device for the waste glass sand geopolymer concrete, soaking and detection are integrated, the soaked concrete does not need to be moved by personnel, and the mechanical property of the concrete can be detected in time after the concrete is taken out of chemical liquid, so that the influence of sulfuric acid and chlorine salt on the concrete can be conveniently tested; and the experimental device is convenient for setting a plurality of experimental control groups, so that chemical solutions with various concentrations can be conveniently subjected to control tests.

The invention belongs to the technical field of reinforcement construction, and discloses a ground polymer concrete grouting reinforcement device and method. The ground polymer concrete grouting reinforcement device comprises a base plate, a mounting platform is arranged at the top of the base plate, a stirring mechanism is arranged on the mounting platform and used for storing and stirring slurry, a grouting pump is mounted on the mounting platform, the feeding end of the grouting pump communicates with the stirring mechanism, and a grouting mechanism is mounted on the mounting platform. The grouting mechanism is arranged on the mounting platform and used for grouting, and the grouting pump supplies slurry to the grouting mechanism. According to the ground polymer concrete grouting reinforcement device and method, through the design of the stirring mechanism, slurry can be stirred to maintain the uniformity of the slurry, layering of the slurry in the grouting reinforcement process is avoided, the slurry can be pushed in the cavity in cooperation with the design of the grouting mechanism, the grouting compactness is ensured, and the grouting reinforcement efficiency is improved. The situation that small holes appear in the grouting layer face to affect the final reinforcing effect is avoided, and the problems proposed in the background technology are solved.

This invention relates to the field of concrete technology, specifically to a self-compacting polymer concrete, its preparation method, and its application. The self-compacting polymer concrete, by weight, comprises the following components: 260-300 parts geopolymer, 80-120 parts composite mineral admixture, 900-1000 parts crushed stone, 700-900 parts washed sand, and 140-160 parts modified coal chemical wastewater. By using geopolymer to replace specific amounts of traditional silicate cement and industrial solid waste, the problems of poor fluidity, high shrinkage, low strength, and easy cracking in concrete prepared with traditional silicate cement are solved.

The application provides a kind of based on waste mud geopolymer concrete and its preparation method, belong to geopolymer concrete technical field.The raw material of the based on waste mud geopolymer concrete of the application includes cementitious material, alkali activator, mud filter cake, aggregate, water, wherein the cementitious material is fly ash and slag powder, the dosage of fly ash in cementitious material is 30-60%, the dosage of slag powder in based on waste mud geopolymer concrete is 99-200kg / cm 3 , the mass ratio of cementitious material, alkali activator, mud filter cake and aggregate is 1:0.38-0.60:1.0-1.1:4.5-4.7, the initial water-binder ratio of based on waste mud geopolymer concrete is 0.40-0.44.The application realizes the reuse of waste mud, and the compressive strength, tensile strength and flexural strength of the prepared based on waste mud geopolymer concrete are all high, which meets the use requirements of concrete.

The application discloses a kind of hybrid fiber reinforced geopolymer concrete dynamic growth factor prediction method and system, it is related to composite material technical field, including: based on the ratio of dynamic peak stress and quasi-static peak stress under given strain rate, obtain initial peak stress growth factor;Based on the ratio of dynamic elastic modulus and static elastic modulus, obtain the dynamic increase coefficient of concrete elastic modulus;In the case where static compression test piece size and dynamic compression test piece size are consistent, analyze the influence of fiber combination mode, fiber type and content and strain rate on the dynamic performance of test piece;Introduce the secondary fitting of fiber characteristic parameter to initial peak stress growth factor, obtain the modified peak stress growth factor;The dynamic increase coefficient of concrete elastic modulus is fitted by linear function, and the modified elastic modulus growth factor and critical strain rate are obtained.The application can accurately predict the dynamic growth factor of hybrid fiber reinforced geopolymer concrete, and then obtain the impact resistance of material.

A method of producing a polymer concrete comprising the steps of dispersing 2D material in a carrier to form a 2D material-carrier dispersion, mixing the 2D material-carrier dispersion with one of a r

The invention relates to the technical field of building materials, and discloses an environment-friendly formula preparation method of a high-molecular concrete release agent, which is prepared from the following raw materials in parts by mass: 30 to 40 parts of high-molecular polymer, 15 to 20 parts of vegetable fat, 8 to 12 parts of environment-friendly solvent, 5 to 8 parts of nano silicon dioxide, 3 to 5 parts of emulsifier, 2 to 4 parts of modified starch, 1 to 2 parts of preservative and 20 to 30 parts of deionized water. The preparation method comprises the following steps: modifying starch, and sequentially carrying out acetylation reaction, cationization reaction and maleic anhydride grafting reaction, so as to obtain the modified starch with hydrophilicity and adsorbability. The modified starch has a synergistic effect with a high-molecular polymer and nano silicon dioxide, so that a uniform and compact isolating membrane can be formed on the surface of concrete, the lubricity and isolation performance of the release agent are remarkably improved, adhesion of the concrete and a template is effectively avoided, and it is guaranteed that the surface of a concrete member is flat and smooth. And meanwhile, by introducing the modified starch, the biodegradability of the release agent is enhanced, and the problem of residue pollution of a traditional release agent is solved.

An ingredient conveying device comprises a machine frame, a first stock bin for storing a first ingredient and a second stock bin for storing a second ingredient are installed on the machine frame, and a storage metering system counts the weight of the ingredients stored in the first stock bin and the second stock bin and counts the weight of the ingredients needed in the batching process. A first ingredient output by the first stock bin and a second ingredient output by the second stock bin enter the mixing stock bin through the discharging system to be mixed, a mixture in the mixing stock bin is output outwards after passing through the mixing system, and the control system is used for controlling the storage metering system, the discharging system and the mixing system. The batching and conveying device has the advantages that the batching and conveying device is suitable for accurate proportioning, mixing and conveying of polymer concrete materials, and the storage metering system, the discharging system and the mixing system work cooperatively under the control of the control system, so that accurate, efficient and stable operation of the batching and conveying device is ensured.

To meet the design requirements and specified strength standards within a short period of time. [Solution] The method for producing geopolymer concrete is a method for producing geopolymer concrete using multiple materials including an activated filler, aggregate, and an alkaline solution as raw materials, and includes a mixing and stirring step in which the raw materials are mixed and stirred such that the W / P, which represents the volume ratio of water content to activated filler, is 1.1 or more, and the A / W, which represents the molar ratio of alkaline components to water content, is 0.075 or more.

The invention discloses a method for improving the high temperature performance of recycled aggregate slag-fly ash based geopolymer concrete, and belongs to the technical field of building materials, the recycled aggregate slag-fly ash based geopolymer concrete comprises the following components: fly ash, slag, an activator, fine aggregate, coarse aggregate and water; the coarse aggregate comprises natural aggregate and recycled aggregate; the recycled aggregate accounts for 25-75% of the mass of the coarse aggregate. The ultrasonic pulse speed, the residual compression resistance, the splitting tension, the fracture resistance and the bonding strength of a sample with the coarse aggregate replacement rate of 50% are equivalent to or even better than those of a sample with the coarse aggregate replacement rate of 0%. After a test piece doped with the PVA fiber is exposed at a high temperature, the number of cracks is reduced, the width of the cracks is reduced, the residual mechanical strength and toughness can be improved, and the compression resistance and breaking strength loss rate of the test piece is lower than that of a test piece not doped with the PVA fiber.

The invention provides a tunnel inverted arch, inverted arch filling early strength slurry bone polymeric concrete and a construction method, and relates to the technical field of tunnel inverted arches, inverted arch filling concrete materials and construction methods. The early-strength slurry bone polymer concrete is formed by injecting an early-strength grouting material into aggregate, the design strength can be achieved within 12 h, and continuous excavation construction of the tunnel is achieved; the aggregate of the inverted arch is 9.5-20 mm, the aggregate of the filling layer is 4.75-31.5 mm coarse aggregate, the aggregate is densely piled in advance, the proportion of the aggregate is large, the shrinkage of the slurry is restrained, and the cooperative development of strength and elastic modulus is facilitated; the early-strength grouting material contains preferable industrial sand and a reasonable dosage of retarder, high strength and high fluidity are achieved, the retarding time meeting the pouring duration is met, the slurry proportion is small, shrinkage is small, the cracking risk is small, and durability is better; during construction, the aggregate is taken and filled nearby, the slurry is prepared and poured nearby, film covering and curing are conducted in time, pure slurry flows fast, consumed time is short, vibration is not needed, the delayed coagulation duration allowance is enough, the initial coagulation risk is small, the management difficulty is small, the forming quality is good, cost is low, and the popularization value is high.

The invention provides cold and heat cycle resistant polymer concrete suitable for construction of a Mars base and a preparation method, and belongs to the technical field of high polymer materials. The cold and heat cycle resistant polymer concrete is prepared from high-density polyethylene, simulated Mars soil aggregate, a hindered phenol antioxidant, nano silicon dioxide, basalt fiber and a fluorine-containing polymer additive. Wherein the high-density polyethylene is used as an adhesive to endow the concrete with good flexibility and temperature resistance, thermal expansion and cold contraction stress can be buffered through chain segment movement in a temperature interval of-150 DEG C to 20 DEG C, the hindered phenol antioxidant inhibits oxidative degradation of the high-density polyethylene at high temperature, and the nano silicon dioxide fills pores to improve compactness and reduce heat conduction; the basalt fiber enhances the crack resistance, the fluorine-containing polymer additive forms a low-surface-energy coating to reduce dust adhesion, the scene with the strict temperature resistance requirement can be met, the preparation process is simple, the raw materials can be obtained in situ, and the space building cost is remarkably reduced.

Provided is a method of producing a polymer concrete comprising 2D material, and a method of producing carbon fibre reinforced polymer.

The invention discloses a hybrid fiber reinforced geopolymer concrete creep test method and system, and relates to the technical field of hybrid fiber reinforced geopolymer concrete.The hybrid fiber reinforced geopolymer concrete creep test method comprises the steps that creep test pieces of different fiber types are prepared; setting different loading conditions, and performing a compression creep test on the creep test piece; in the compression creep test process, creep data of all creep test pieces are collected, and the creep data are processed; and evaluating the creep performance of the hybrid fiber reinforced geopolymer concrete based on the processed creep data. The method focuses on creep behaviors of GPC and HFGPC under the action of long-term compression load. By analyzing the influence of the fiber type, the axial compression stress ratio and the confining pressure level on the creep characteristic, the deformation rule of the fiber reinforced composite material in a long-term service state is disclosed, a theoretical basis is provided for engineering application of the HFGPC, and a reference is provided for prediction of the creep coefficient of the HFGPC.

The invention provides red-mud-based ultrahigh-strength geopolymer concrete and a preparation method thereof, and belongs to the field of civil engineering materials. According to the concrete, granulated blast furnace slag, fly ash, silica fume and red mud are used as composite cementing materials, a sodium silicate solution is used as an alkali activator, and steel fibers are doped for reinforcement. By optimizing the ratio of the silica fume to the red mud, the alkali doping amount and the thermal curing process, the problems of insufficient formation of a geopolymer gel network, limited strength development and the like caused by independent or excessive use of the red mud are solved. According to the prepared concrete, under the condition that no efficient water reducing agent is needed, the compressive strength of 28 days can reach 147 MPa to the maximum, the breaking strength reaches 14 MPa, large-amount and high-added-value resource utilization of the red mud is achieved, and the concrete has the characteristics of high strength and environmental protection.

The invention discloses a hybrid fiber reinforced geopolymer concrete test system and a dynamic performance evaluation method, and relates to the technical field of material engineering. The system comprises an energy device, a transmitting device, a pressure rod and a buffer device which are connected in sequence, the energy device is used for forming impact air pressure to impact the transmitting device, the transmitting device comprises a transmitting cylinder and an impact rod arranged in the transmitting cylinder and is used for impacting the pressure rod to generate loading waves, and the pressure rod comprises an incident rod, a test piece and a transmission rod which are connected in sequence. The buffer device is used for generating strain information of the test piece and buffering impact. Theoretical support and data basis are provided for application of the hybrid fiber reinforced geopolymer concrete in impact-resistant constructional engineering.

The application discloses a lithium residue-based anti-salt corrosion concrete pole and a preparation method thereof. The pole is made of lithium residue-based polymer concrete, and components of the pole include 20-30 parts of dealkalized red mud, 15-25 parts of activated lithium residue, 10-15 parts of slag, 5-8 parts of silica ash, 6-10 parts of magnesium phosphate cement, 12-18 parts of composite alkali activator, 25-35 parts of machine-made sand, 40-50 parts of gravel, 0.4-0.6 parts of polycarboxylic acid water reducer, 0.8-1.2 parts of composite fiber, 2-3 parts of anti-salt corrosion rust inhibitor and 25-35 parts of water. The pole is coated with a silicone-fluorosilicon resin hydrophobic coating on the outer surface. The anti-salt corrosion rust inhibitor is compounded by nano-silicon dioxide, hydrotalcite precursor and triphosphonic acid-based rust inhibitor. The concrete pole is obtained through the processes of pretreatment of red mud and lithium residue, raw material mixing, centrifugal molding, curing and surface treatment, and has excellent anti-salt corrosion performance and mechanical properties.

This invention provides a grout-aggregate polymeric concrete for tunnel secondary lining and its construction method, relating to the technical field of tunnel concrete materials and construction methods. In the grout-aggregate polymeric concrete of this invention, the aggregate is a single or two types of coarse aggregate densely packed to form a larger skeleton proportion, which can exert a stronger inhibitory effect on the hardening shrinkage of the grout, ensuring structural strength while significantly reducing the shrinkage rate. By screening spherical industrial sand with activity and water-retaining curing functions as fine aggregate for use in the grout, the fluidity, strength, and shrinkage resistance are improved. Further incorporation of trace amounts of nano-silica does not affect fluidity and can synergistically improve compressive strength, flexural strength, and impermeability. Moreover, pre-filling the aggregate and then injecting the grout to fill and encapsulate the aggregate can reduce the energy consumption of traditional concrete aggregate reciprocating transportation and overall raw material mixing. The tunnel secondary lining pouring method of this invention is simple, efficient, low-cost, low-pollution, and produces good molding quality.

The utility model relates to the field of buildings, in particular to a fabricated profile steel lightweight concrete composite board combined roof. The roof panel is arranged on the structural beam, the acoustic board is arranged on the lower surface of the roof panel, the fireproof suspended ceiling is arranged on the lower portion of the structural beam, and the sound insulation device is used for insulating sound. The roof panel comprises a heat insulation concrete layer, an inner core plate, a three-dimensional galvanized steel wire mesh, a section steel beam, a concrete surface layer, a waterproof layer and a facing layer, wherein the inner core plate, the three-dimensional galvanized steel wire mesh and the section steel beam are arranged in the heat insulation concrete layer, the concrete surface layer is arranged on the heat insulation concrete layer, the waterproof layer is arranged on the concrete surface layer, and the facing layer is arranged on the waterproof layer. The inner core plate is made of efficient heat preservation materials, and the heat insulation concrete layer is made of cement porous polymer concrete. The fabricated profile steel lightweight concrete composite board combined roof is remarkable in impact sound inhibition effect and good in fireproof and heat-insulating performance and environment-friendly benefit.

The invention discloses a hybrid fiber reinforced geopolymer concrete static and dynamic compression constitutive model construction method which is applied to the technical field of structural mechanics analysis. The method is based on an elastic-plastic theory, considers the influence of elastic-plastic and damage coupling, constructs a nonlinear constitutive model framework, combines fiber characteristics and a failure mechanism, regards a damage variable as a random variable, explains a physical mechanism of damage generation and evolution, and expands a deterministic constitutive model into a probabilistic constitutive model. And finally, an elastic-plastic random damage model of the HFGPC is established, plastic evolution is corrected by using a Perzyna model, a strain rate effect is introduced into damage evolution, and an HFGPC static and dynamic constitutive model considering the fiber failure mechanism and the strain rate effect at the same time is established.

The present disclosure relates to the manufacture of expanded metal and to an expanding apparatus for expanding very thin metal foil sheets (12.5pm to 100pm thickness). The subject thin foils will be expanded with sub-millimeter size tooth blades for very small pore sizes, and advanced in small increments for uniform hole or pore distribution. The expanding blade may comprise between 400 and 1440 teeth per inch which may provide a range of pore sizes from roughly 5-6pm up to about 48-50pm. The expanding apparatus generally comprises a polymer concrete machine base, a granite expander frame atop the base, stationary lower blade mount and fixed blade mount, an upper blade actuator assembly including piezo actuator driven reciprocating blade assembly which moves up and down and side to side cooperating with the fixed blade to expand metal passing through the head.

A powder mixture capable of easily forming a geopolymer solidified body at a site and of producing a geopolymer solidified body having high strength. The geopolymer solidified body is made to be formed by adding water or with water and aggregate to a powder mixture obtained by mixing an active filler and an alkali powder, thus a geopolymer solidified body can be formed by bringing the powder mixture previously prepared into a site and mixing the powder mixture with water or with water and aggregate at the site. Further, any one of a powder of sodium metasilicate, a powder of sodium metasilicate and sodium hydroxide, and a powder of sodium metasilicate and potassium hydroxide is made to be used as an alkali powder of the powder mixture, and therefore geopolymer concrete having high strength can be formed.

The invention relates to a steel bridge deck polymer concrete thin layer vibration paving construction method in a traffic state, and belongs to the technical field of steel bridge deck paving, and the method comprises the following steps: S1, preparation before construction; s2, paving the polymer concrete; s3, surface treatment; s4, joint cutting and maintenance are conducted; s5, dynamic traffic construction coordination; s6, quality control and safety measures; and S7, opening traffic management. According to the steel bridge deck polymer concrete thin layer vibration paving construction method in the open-traffic state, through three innovations of dynamic traffic coordination, material-process-equipment collaborative optimization and safety risk closed-loop management and control, on the premise that smooth traffic operation is guaranteed, the purposes of high efficiency, safety and durability of steel bridge deck paving in the open-traffic state are achieved; meanwhile, construction safety is effectively guaranteed, high economic benefits and social benefits are achieved, a technical normal form is provided for rapid maintenance of urban bridges, and remarkable economic, social and environmental benefits are achieved.

The utility model relates to the technical field of concrete cutting, in particular to a test piece cutting device for polymer concrete water absorption testing, which comprises a bottom plate, a fixing column integrally formed with the bottom plate is arranged at the top of the bottom plate, a cross rod integrally formed with the fixing column is arranged at the top end of the fixing column, and a hydraulic cylinder is arranged at the top of the cross rod. The output end of the hydraulic cylinder penetrates through the cross rod to be connected with a cutter, a connecting device is arranged in the output end of the hydraulic cylinder, the cutter can be rapidly disassembled and assembled from the output end of the hydraulic cylinder through the connecting device, a placing table is arranged below the cutter, and an avoiding device is arranged in the middle of the placing table. Furthermore, the cutter can be prevented from cutting the placing table, and the use experience can be further improved.