175 results about "Universal testing machine" patented technology

The invention discloses a titanium alloy deformation behavior testing device and method, and relates to the technical field of material deformation testing, the titanium alloy deformation behavior testing device comprises a universal testing machine, a clamping module, an ultrasonic vibration module, an electric pulse excitation module and a cooperative control module, the clamping module comprises a ceramic chuck main body, and a conductive contact is arranged on the clamping surface of the ceramic chuck main body; the ultrasonic vibration module comprises an ultrasonic vibrator, and the ultrasonic vibrator is arranged on one side of the ceramic chuck body and used for applying an ultrasonic vibration signal to the titanium alloy sample; the electric pulse excitation module is connected with the conductive contact and is used for applying an electric pulse signal to the titanium alloy sample; the cooperative control module is connected with the clamping module, the ultrasonic vibration module and the electric pulse excitation module. According to the invention, synchronous loading of mechanical load, electric pulse and ultrasonic vibration can be realized, and the clamping module solves the problems of electric conduction, vibration transmission and interference resistance, so that the deformation behavior of the titanium alloy in the electro-acoustic composite field can be accurately and reliably tested.

The utility model provides an electronic universal testing machine, which relates to the field of performance testing equipment and comprises an electronic universal testing machine body, a pressure testing assembly is mounted on the electronic universal testing machine body and used for testing, and a supporting seat is arranged below the pressure testing assembly. A positioning plate capable of being adjusted front and back is arranged on the supporting base and used for positioning a workpiece. The positioning plate can realize accurate adjustment of the front-back position through the adjusting assembly, ensures that the workpiece can be accurately located under the pressure testing assembly, avoids uneven stress caused by position deviation of the workpiece, and improves the accuracy of a testing result. The clamping structure is connected with the positioning plate through the self-adaptive assembly, and the clamping position can be automatically adjusted according to workpieces of different sizes. The self-adaptive adjusting function can ensure that the workpiece does not displace in the left-right direction in the testing process and keeps stable, so that the force borne by the workpiece is uniformly distributed in the testing process, and the reliability of test data is ensured.

1. The name of the design product: microcomputer control electronic universal testing machine (300KN). 2. The use of the design product: the design is used for testing the mechanical properties of various non-metals, metals and composite materials. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention belongs to the technical field of material testing, and discloses a connecting assembly of a high and low temperature test box universal testing machine, which comprises a bearing assembly, two clamping assemblies are arranged in the bearing assembly, the bearing assembly comprises a support frame, the support frame is connected with a test box, two partition plates are connected in the test box, and the two partition plates are arranged on the support frame. The test box is internally provided with a test cavity, the test cavity is located between the two partition plates, the two clamping assemblies move in the test cavity, and adaptation to test pieces of different specifications is achieved through cooperation of the multiple assemblies. A telescopic part in the bearing assembly can adjust the distance between the two clamping assemblies to meet the requirements of test pieces with different lengths; the restraining block of the clamping assembly slides along the sliding groove, and the diameter of the threaded cavity can be changed to adapt to test pieces with different diameters. Meanwhile, the tapping part can adjust tapping parameters according to the material of the test piece, and is matched with a constraint block pressure sensor for monitoring, so that the tapping effect of the high-hardness test piece is ensured, and stable clamping of the test pieces of various sizes and materials is realized.

The utility model discloses an electric servo control universal testing machine which comprises a base, a pressure detection table is arranged in the base, a supporting plate is arranged in the side direction of the base, and supporting frames are arranged at the two ends of the supporting plate. A downward pressing push plate is arranged on the inner side wall of the supporting plate, a first sliding rail and a second sliding rail are arranged on the side wall of the supporting frame from inside to outside, a first protection frame is arranged on the first sliding rail in a sliding mode, and a second protection frame is arranged on the second sliding rail in a sliding mode; the first protection frame and the second protection frame are arranged, and the sliding stroke of the second protection frame is higher than that of the first protection frame, so that scrap splashing caused by material crushing in the test process is effectively prevented. By means of the double-layer protection design, the risk of injury to surrounding equipment and workers can be greatly reduced, and the safety of the test process is improved. Splashed chippings have large kinetic energy and are prone to damaging a testing machine and other peripheral equipment.

The utility model relates to a 90-degree stripping assistive device which is installed on a testing machine and comprises a transverse sliding table, the left end and the right end of the transverse sliding table are connected with a left pressing plate and a right pressing plate respectively, the two pressing plates are both connected with compression bolts, a linear sliding rail is formed on the bottom face of the transverse sliding table and connected with a linear sliding block in a sliding mode, and the bottom of the linear sliding block is fixedly connected with an adapter through a sliding block base. The back face of the sliding block base is vertically connected with an installation support located between the universal testing machine and the transverse sliding table, a sample roller is rotationally installed on the installation support, a fixed pulley is rotationally installed on the front face of the sliding block base, and the lower end of the left pressing plate is connected with a pull rope which passes through the fixed pulley and is upwards connected with a movable cross beam of the testing machine through a pull rope buckle. The bottom of the movable cross beam is connected with a clamping mechanism for clamping one end of a sample through an S-shaped sensor. According to the utility model, the synchronous pull rope is adopted for traction, so that the self weight of the auxiliary tool is effectively eliminated, and the problem of unstable measured data caused by lagging overload detection is solved.

This utility model discloses a device for testing the riveting strength of eccentric bolts, including a universal testing machine, a base, and a sleeve. The base is placed on the testing platform of the universal testing machine. The base has a threaded hole at its central axis for screwing in the shank of the eccentric bolt. The sleeve has a through hole for the head of the eccentric bolt to pass through. A gap is left between the inner wall of the through hole and the outer wall of the head of the eccentric bolt. After the sleeve passes through the head of the eccentric bolt, it contacts the washer of the eccentric bolt and applies vertical pressure to the washer of the eccentric bolt under the action of the loading head of the universal testing machine. The advantages are that it can quickly and accurately measure the riveting strength of bolts, is easy to operate, and provides reliable test data.

The application provides a controllable simple heating compensation device and a test block pressurization and temperature control experiment method, and relates to the technical field of material mechanics experiment equipment. The device takes a heating gun as a heat source, a temperature sensing magnet as a temperature measuring element, cooperates with a temperature control switch with a temperature interval setting to form a temperature control core, and is wrapped with a heat preservation device made of simple heat preservation materials around the pressurization end of a universal testing machine and a test block. Through temperature measurement feedback, the automatic start and stop of the heating gun is realized, the heat loss of the test block is reduced, and the test block is stably kept in the set temperature interval during the whole pressurization process. The application effectively solves the problems of easy temperature fluctuation of the test block and high cost of the existing temperature control device structure in the test block pressurization experiment of the universal testing machine. The overall structure of the device is extremely simple, convenient to install and low in cost, and can ensure the accuracy and reliability of the test block pressurization mechanics experiment data.

The invention relates to the technical field of soil detection, in particular to a device and method for detecting the adhesive force of soil on the soil touch metal surface of an agricultural machine. The device comprises a mounting shell and a sliding strip slidably connected with the mounting shell in the vertical direction, and the bottom end of the sliding strip is rotationally connected with a lower pressing plate; the rotating center line is perpendicular to the sliding direction of the sliding strip. A locking part used for limiting rotation of the lower pressing plate is arranged between the lower pressing plate and the sliding strip. A driving part for driving the sliding strip to slide is arranged in the mounting shell; the sliding strip is provided with a measuring part used for measuring tension and pressure in the length direction of the sliding strip. The bottom of the mounting shell is detachably and fixedly connected with a plurality of supporting legs in a vertical state. The problems that in the prior art, a universal testing machine is large in size, depends on a fixed power source and is difficult to transport to fields such as farmland for detection, and laboratory simulation soil is greatly different from an actual region are solved.

An embodiment of the present invention provides an optical film which has a stiffness index (STI) of 80 to 190, based on a thickness of 50 μm. The Stiff Index is calculated by expression 1 below: [Expression 1] STI=Shore D hardness×tensile modulus. In expression 1, “STI” denotes a stiffness index, the Shore D hardness is a hardness measured using a Shore D durometer, and the tensile modulus is a tensile modulus measured using a universal testing machine.

The utility model discloses a compression mode clamp structure of a universal testing machine, which comprises an upper connecting column and a lower connecting column, the bottom of the lower connecting column is fixed on the top surface of a base of the universal testing machine, and the top of the upper connecting column is fixed at the bottom of a force sensor mounted in the middle of the bottom surface of a lifting cross beam mounted in the middle of the universal testing machine. An upper pressing head connecting piece is installed at the bottom of the upper connecting column, an inserting hole extending upwards is formed in the middle of the bottom face of the upper pressing head connecting piece, and the pressing head is located under the upper pressing head connecting piece. The upper pressing head connecting piece is directly installed on the upper connecting column, the pressing head can be installed only by screwing the upper locking nut after the vertical rod is inserted into the upper pressing head connecting piece, when the pressing head is disassembled, the pressing head can be lowered and disassembled only by unscrewing the upper locking nut and pulling the two holding parts outwards, assembling and disassembling are convenient, the pressing head is convenient to replace, the replacement efficiency is high, and the cost is low. And test requirements are met.

The clamping device for the universal testing machine comprises a shell, a clamping mechanism, a first driving mechanism and a second driving mechanism, the second driving mechanism is arranged in the shell and connected with the clamping mechanism, the clamping mechanism is located at the top of the shell, the first driving mechanism penetrates through the side face of the shell and is movably connected with the second driving mechanism, and the second driving mechanism is movably connected with the clamping mechanism. The first driving mechanism is used for driving the second driving mechanism to rotate; the clamping mechanism comprises a fixing disc, a positioning ring and a clamping assembly, the fixing disc is installed on the upper surface of the shell, and the upper surface of the fixing disc protrudes to form the positioning ring; the second driving mechanism comprises a rotating column, a second bevel gear, a positioning mechanism and an extrusion assembly, and the rotating column is located in the shell and connected with the center of the fixing disc through the positioning mechanism. The clamping device for the universal testing machine can clamp a thin-walled tube more conveniently, and is simple in structure and convenient to operate.

This application relates to a hydraulic universal testing machine, belonging to the technical field of testing equipment. It includes an operating table with two crossbeams. Each of the two crossbeams has a clamping block on its opposite side. Multiple clamping blocks are arranged in a circle, with an inclined surface on the outer wall of each clamping block from the outside in. A reinforcing device is provided between the clamping block and the crossbeam. A clamping ring is circumferentially arranged around the periphery of each clamping block, sliding along the length of the inclined surface. A moving rod is fixedly connected to the side wall of the clamping ring away from the clamping block. A first cavity is formed on the surface of each crossbeam facing the moving rod. A lead screw is slidably connected within the first cavity. The end of the lead screw away from the first cavity is fixedly connected to the moving rod. A threaded sleeve is threadedly connected to the circumferential side wall of the lead screw, rotating between the threaded sleeve and the side wall of the crossbeam. This application facilitates experiments for operators.

The invention discloses a thermal flow oxygen salt five-field combined cross-sea-area high-speed flight simulation working condition experimental testing device and method, and belongs to the field of material testing. The device is used in cooperation with a universal testing machine, a fan, an electromagnetic induction heating module, an oxygen supply module, a salt mist generation module, a temperature / deformation field measurement module and an environmental parameter measurement module are arranged inside and outside a high-speed airflow circulation loop, and a sample is loaded through the universal testing machine and placed in an experiment section in the high-speed airflow circulation loop. Wide-temperature-range closed-loop control of the temperature of the sample, construction of a comprehensive stress state and construction of a controllable high-speed airflow, adjustable oxygen concentration and salt mist concentration gas environment are realized, so that a real material application environment is simulated, and acquisition of data of a temperature field, a deformation field and an oxidation corrosion field of the sample can be completed in a reaction process; the problem that a cross-sea-area high-speed aircraft service condition environment full-state simulation test cannot be realized in the prior art is solved.

The utility model relates to the technical field of road tests, and discloses a road base material universal testing machine which comprises a machine base, a conveying base is fixedly installed on the bottom side of the machine base, a filtering box is movably installed on the inner side of the conveying base, and a water accumulation box is installed on the bottom side of the conveying base through bolts. The simulated road is placed on the inner side of the groove in the top side of the machine base, in the using process, through the partition plate, supporting uniformity can be improved, meanwhile, it can be avoided that the simulated road makes direct contact with the groove, and consequently the permeability of simulated rainwater in the later period is reduced; the electric push rod is started to drive the splash-proof cover to move downwards and extrude and limit the periphery of the simulated road, so that the situation that the test precision is influenced by side wings of the simulated road when rainwater is simulated is avoided, and in the rainwater simulation process, a water source is prevented from splashing under the action of the splash-proof cover, and the test efficiency is improved. And the viewing and observation of workers are influenced while the resources are wasted.

This utility model relates to the technical field of adhesion testing devices, specifically a device for measuring the adhesion of polyurethane grouting materials. It includes: a bottom sample stage, a universal testing machine body, and a programmable computer. The bottom sample stage is mounted on the base of the universal testing machine body, and a clamping assembly is mounted on the displacement beam. The device fixes the substrate to be tested in the center of the bottom sample stage, applies polyurethane grouting material to the center of the substrate surface, and places a pre-made Marshall cylindrical mixture specimen on top to allow the grouting material to cure naturally. Four adjusting rods are manually tightened to clamp the Marshall specimen, and the displacement beam is controlled to move upwards at a uniform speed. This device can efficiently and stably test the interfacial adhesion performance between polyurethane grouting materials and different road substrates under controlled temperature and humidity conditions, improving the engineering guidance value and application extrapolation of the experimental results. Furthermore, worn clamping plates can be easily removed and replaced.

The application discloses a kind of concrete asymmetric fatigue test systems based on ultrasonic vibration loading, including universal testing machine, ultrasonic frequency generator, ultrasonic transducer, upper displacement amplifier and lower displacement amplifier and for reducing system loading eccentric moment ball hinge mechanism, the ball hinge mechanism is connected with lower displacement amplifier bottom by clamping connecting disc.This application also provides a kind of concrete asymmetric fatigue test method based on ultrasonic vibration loading, fix the concrete test piece of equal cross section cylinder between upper displacement amplifier and lower displacement amplifier, then open universal testing machine, ultrasonic frequency generator and ultrasonic transducer, realize the ultrasonic vibration asymmetric compression-compression fatigue cycle loading of concrete test piece.The application can realize the asymmetric compression-compression fatigue loading of concrete test piece by ultrasonic fatigue test technology, solve the problem of high time cost in the super-long life fatigue test of traditional concrete fatigue test system.

The utility model discloses a mobile crossbeam for universal testing machine belongs to universal testing machine technical field, mobile crossbeam section is square, hollow inside, and the middle part of mobile crossbeam is equipped with the through -hole for the installation of clamp, and the inside of mobile crossbeam is equipped with two strength support device symmetrical in the through -hole left and right sides, and strength support device includes the resin concrete column of supporting the inside surface of mobile crossbeam up and down and is located in the resin concrete column several longitudinal distribution's prestressed steel, and the both ends of prestressed steel are curved to the outside of mobile crossbeam, and resin concrete column is with mobile crossbeam interference fit. In addition, the utility model still provides the manufacturing and installation method of above -mentioned strength support device. The utility model improves mobile crossbeam rigidity through the structure improvement, avoids the micro deformation of mobile crossbeam in the test process because of the clamp pressure through the inside strength support device, improves mobile crossbeam service life and test accuracy.

1. Name of the product in this design: Microcomputer-controlled electronic universal testing machine. 2. Application of this design: For mechanical testing of metals, non-metals and composite materials, including tensile, compression, bending, shearing, peeling, tearing and other tests. 3. The key design feature of this product is its shape. 4. Images or photos that best illustrate the design key points: Combined state reference diagram. 5. Other situations requiring explanation: This product is a component product. Component 1 is the measurement and control cabinet (including computer), component 2 is the host, and component 3 is the host cabinet.

The present invention discloses an electro-assisted tension-compression cyclic loading device and testing method for ultra-thin titanium plates. The device comprises a composite tension-compression specimen, wherein a lateral force is applied to both sides of the composite tension-compression specimen; two pairs of electro-assisted fixtures, respectively clamping both ends of the composite tension-compression specimen, include two oppositely arranged clamping heads. The clamping surface of the clamping heads have a conductive structure, and the conductive structure is connected to an external power source, so that when the composite tension-compression specimen is clamped on the clamping head, the conductive structure contacts the composite tension-compression specimen to transfer current to the composite tension-compression specimen through the conductive structure to heat it. The clamping head is further connected to the loading end of a universal testing machine. The present invention can avoid torsional deformation of the ultra-thin titanium plate specimen during the test.

The application discloses a kind of spring washer elastic performance testing device, belong to spring washer elastic performance testing technical field;Solve the elastic performance testing device of existing spring washer needs additional reliance electronic universal testing machine and other large equipment, the space of test site and the high requirement of related hardware matching, and the problem of complicated operation, low efficiency in test process.The testing device of the application includes fixed base, pressure measurement and pressure display component, step stud, pre-tightening force applying component, pre-tightening force conducting component;The lower end of step stud is fixed on fixed base, and step stud is sequentially penetrated by pre-tightening force applying component, spring washer, pre-tightening force conducting component and pressure measurement and pressure display component from top to bottom.The testing device of the application is simple in structure, low in preparation cost and can load and unload multiple spring washers at a time under specified load, with high testing efficiency.

The utility model discloses an oil-electricity hybrid universal testing machine which comprises a base, a machine body is fixedly mounted at the upper end of the base, and a machine door is rotatably connected to the outer side of the machine body; the control module is fixedly mounted on the outer side of the machine body; the stretching assembly is mounted on the inner side of the machine body; and the clamping assembly is mounted on the outer side of the stretching assembly. According to the oil-electricity hybrid universal testing machine, after the two ends of a workpiece are fixed, a servo motor is operated, the output end of the servo motor drives a first different-direction threaded rod to rotate, the first different-direction threaded rod rotates to drive two sets of threaded connectors in threaded connection with the outer side to move reversely, and the two sets of threaded connectors move reversely, so that the workpiece is fixed. And the tensile strength of the workpiece can be judged by observing the numerical value of the tension sensor between the connecting plates and the test plate, so that the performance of the workpiece can be conveniently evaluated.

This invention discloses a precise testing method for the tensile properties of naturally aged SWRH82B steel wire rod, belonging to the field of metallic material performance testing technology. The method includes: sample preparation: selecting 12.5mm SWRH82B steel wire rods from the same batch, removing defects, and processing to uniform dimensions, then naturally aging them at 5℃ for at least 3 weeks; tensile parameter setting: adopting a two-stage control mode, using a strain control rate of 0.02-0.2%S, displacement control for tensile strength Rm testing, and simultaneous recording of reduction of area Z%; standardized testing: performing tensile tests on a microcomputer-controlled electro-hydraulic servo universal testing machine according to preset parameters; result correction: data correction based on the steel wire rod's microstructure, nitrogen and hydrogen content, and surface quality. This invention can accurately reflect the true tensile properties of SWRH82B steel wire rods, is suitable for factory quality control and engineering acceptance scenarios, and is suitable for standardized promotion and application.

The application provides a device and method for directly pressing a sample in a ring, which simulates a jointed compacted bentonite assembly, and comprises two parts of sample pressing and reserved steel sheet taking out; before sample pressing, a base, a steel sheet, a sample ring and a sample pressing ring are assembled in sequence, and a through groove is designed to ensure stability of the steel sheet, fixation of a preset joint position and support for subsequent pressing of the reserved steel sheet; after sample pressing, the sample pressing assembly is inverted, the steel sheet is pressed out at a constant speed by means of a universal testing machine, the original pressing assembly is converted into a supporting assembly, and soil body tearing caused by friction during pressing of the steel sheet is effectively reduced. The application realizes direct pressing of the jointed compacted bentonite assembly in a ring, avoids changes in joint width and structural damage at edges and corners of the sample caused by sample transfer from a sample pressing mold to a test ring, ensures uniformity and stability of the directly pressed assembly sample, and provides technical support for research on construction joints of a bentonite buffer layer in a high-level radioactive waste deep geological repository.

To provide an aluminum nitride plate having excellent reliability.SOLUTION: The aluminum nitride plate includes aluminum nitride and an oxide having yttrium and aluminum as constituent elements. The surface strength of the central portion of the aluminum nitride plate measured at a compression speed of 0. 5mm / min using a universal tester is equal to or higher than 300MPa.SELECTED DRAWING: Figure 1

The utility model discloses a hydrogen fuel cell carbon paper deformation detection device which comprises a universal testing machine, an experiment pressing block, an experiment cushion block, a polar plate carbon paper stacking structure, a video extensometer, a concentrated light source and a microscope, the polar plate carbon paper stacking structure is arranged between the experiment pressing block and the experiment cushion block, and the universal experiment machine is configured to provide continuously changing packaging force and uniformly transmit the packaging force to the polar plate carbon paper stacking structure through the experiment pressing block and the experiment cushion block, namely, the mechanical environment of carbon paper in a galvanic pile is simulated; the concentrated light source is configured to provide brightness, and the video extensometer and the microscope are configured to observe the form change of the carbon paper in the polar plate carbon paper stacking structure after continuous stress. The device simulates the in-pile mechanical environment through the universal testing machine, and directly observes the real form change of the carbon paper in the flow channel through the optical detection technology, thereby being beneficial to improving the cognition on the internal structure of the electric pile and guiding the design of the electric pile.

The present application provides a kind of multiple injection shear sample forming die, by setting first cavity and second cavity of terminal overlap, and the switching slider that can realize first cavity and second cavity communication or separate, and the switching insert that realizes second runner and second cavity communication or disconnect, can complete in sequence in two cavity respectively independent injection molding, and in two cavity overlapping portion (double cavity) realize twice injection remelt, form fusion interface, obtain shear sample;The shear sample obtained is stretched by universal testing machine Shear test, and the shear strength is obtained, which is used to evaluate the performance of the fusion interface formed by the insert injection molding of any two materials. The influence law of different factors on the performance of the fusion interface obtained by the experiment can be used to guide the actual product production.

The present invention discloses a test device for composite sandwich structures and a method for testing type I fracture toughness. The test device includes: a guide rail; a test connection structure fixed relative to the guide rail; a guide slider slidably connected to the guide rail; a specimen connection structure detachably fixed to the slider; a loading connection structure; and a crack detection device. The method for testing type I fracture toughness is applicable to any of the composite sandwich structure test devices mentioned above, and includes the following steps: preparing a composite sandwich structure specimen; installing the composite sandwich structure specimen on the test device, and installing the composite sandwich structure test device on a universal testing machine; adjusting the crack detection device; initial loading; secondary loading; recording the load value, displacement value, and effective crack extension value; after the test is completed, the chuck of the universal testing machine is loosened, and the computer calculates the G of the composite sandwich structure specimen. IC value, export the test results, and make load-displacement curve and R curve.

The invention relates to the technical field of universal testing machines, in particular to a clamping device for a universal testing machine. Comprising a machine body with an upper cross beam and a lower cross beam, clamps are arranged on the upper cross beam and the lower cross beam respectively, at least one clamp comprises a shell with an opening in the upper end, a transmission block driven by a lifting mechanism is installed in the shell and provided with a wedge-shaped groove with an opening in the upper end, and a left clamping block and a right clamping block are installed in the wedge-shaped groove. The left side surface of the left clamping block and the right side surface of the right clamping block are consistent with the left surface and the right surface of the wedge-shaped groove in inclination angle, and the width of the lower bottom of each clamping block is smaller than 1 / 2 of the width of the lower bottom of the wedge-shaped groove and larger than 1 / 2 of the width of an upper end opening of the wedge-shaped groove. Transverse connecting structures are arranged on the two sides of the upper portions of the two clamping blocks, transverse guide grooves are formed in the upper end of the shell, and the outer ends of the transverse connecting structures are located in the transverse guide grooves and matched with springs in the transverse guide grooves. According to the invention, universal, efficient and reliable clamping of various samples is realized, and the accuracy and repeatability of testing are improved.

The external hydraulic oil filtering device of the universal testing machine comprises a supporting frame, an oil tank is fixedly connected to the outer wall of the top of the supporting frame, an oil pump and two shells are fixedly connected to the inner wall of the bottom of the supporting frame, and a second connecting pipe is fixedly communicated between the two shells. The feeding end and the discharging end of the oil pump are communicated with the portion, close to the oil pump, of the shell and the oil tank respectively, a mounting opening is formed in one side of the shell, a door plate is arranged in the mounting opening, a second baffle ring is fixedly connected to the inner wall of one side of the door plate and located in the shell, and a first baffle ring is fixedly connected to the circumferential inner wall of the shell. According to the filtering device, a worker can conveniently and rapidly clean and replace the filtering plate, meanwhile, the position of the sliding plate can be kept stable through matched use of the inserting rod and the inserting groove, and the inserting rod and the inserting groove can be rapidly and accurately in butt joint.