Concentric positioning installation device

Abstract

The utility model discloses a concentric positioning installation device, which comprises a frame, a synchronizing wheel, a guide block and an output part, the frame is a cylindrical shell and comprises a peripheral surface, an upper end surface and a base, and a test piece is arranged between the upper end surface and the base and is coaxial with the frame; the synchronizing wheel is rotationally installed on the upper end face and coaxial with the frame, two or more sets of synchronizing connecting rods are arranged on the synchronizing wheel and evenly distributed, and the symmetric centers of the synchronizing connecting rods are located on the axis of the synchronizing wheel; the more than two guide blocks are in one-to-one correspondence with the synchronous connecting rods, are fixedly arranged at the end parts of the synchronous connecting rods and are positioned on the inner side of the peripheral surface, and the symmetric centers are positioned on the central line of the frame; the output parts are in one-to-one correspondence with the guide blocks and penetrate through the peripheral surface and the guide blocks at the same time, the radial output positions of the output parts are determined, the output ends of the output parts are connected with positioning pins, and the positioning pins are driven by the output parts to be synchronously adhered to the test piece. The device realizes concentric positioning, and improves the simulation accuracy of the test process.

Description

Technical Field

[0001] The utility model belongs to the technical field of positioning installation, and in particular relates to a device capable of realizing concentric positioning through linkage installation. Background Art

[0002] At present, it is necessary to test asphalt mixtures to examine the changes in various properties of asphalt mixtures under long-term pressure over time, so as to determine their service life, so that they can be repaired in time and the maintenance cycle and cost can be predicted in advance. However, existing machines cannot achieve automatic control and have low accuracy, resulting in inaccurate test data, which in turn causes biased conclusions, affects budgets, and road safety.

[0003] When testing asphalt mixtures, the test lead-out components on the asphalt mixture need to be installed concentrically to avoid eccentricity affecting the test conclusions. Eccentricity will cause the impact of pressure waves to deviate from reality, making it impossible to correctly simulate the actual environment and pressure, and the results will be very different.

[0004] Therefore, how to solve one of the above problems and achieve concentric positioning through linkage installation is an issue that the industry urgently needs to solve. Utility Model Content

[0005] A main purpose of the utility model is to provide an asphalt mixture performance testing machine which can improve the automatic control level of the testing process and improve the accuracy of the test data.

[0006] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0007] As one aspect of the present invention, a concentric positioning installation device is provided, comprising:

[0008] A frame, wherein the frame is a cylindrical shell, comprising an outer peripheral surface, an upper end surface and a base, and the test piece is arranged between the upper end surface and the base and is coaxial with the frame;

[0009] A synchronous wheel, the synchronous wheel is rotatably mounted on the upper end surface and is coaxial with the frame, and the synchronous wheel is provided with more than two sets of synchronous connecting rods, and the two or more sets of synchronous connecting rods are evenly distributed and the symmetry center is located on the axis of the synchronous wheel;

[0010] Guide blocks, the number of the guide blocks being more than two, corresponding one to the synchronous connecting rod, and fixedly arranged at the end of the synchronous connecting rod, located on the inner side of the outer peripheral surface, and the symmetry center being located on the center line of the frame;

[0011] Output part, there are more than two output parts, corresponding to the guide blocks one by one, the output part passes through the outer peripheral surface and the guide block at the same time, the radial output position of the output part is determined, and a positioning pin is connected to the output end of the output part, and the positioning pin is synchronously adhered to the test piece under the drive of the output part.

[0012] As in one embodiment of the present invention, the outer peripheral surface of the frame is a hollow structure.

[0013] As in one embodiment of the present utility model, the number of the synchronous connecting rod, the guide block and the output part are all three, the output part includes two layers of output ends, and the number of the positioning pins is six, corresponding one to one with the output ends.

[0014] As in one embodiment of the present invention, the concentric positioning installation device further includes a lifting and lowering pressure column and an upper pressure plate, the lifting and lowering pressure column passes through the axial hole of the synchronous wheel to connect to the upper pressure plate, and the upper pressure plate presses against the test piece.

[0015] As in one embodiment of the present utility model, a guide seat is sleeved on the outer side of the lifting and lowering column, and the guide seat is located above the synchronous wheel.

[0016] As in one embodiment of the present invention, the synchronous connecting rod is L-shaped, one end of which is connected to the synchronous wheel, and the other end of which is cantilevered and protrudes from the outer side of the synchronous wheel.

[0017] As in one embodiment of the utility model, the output part includes a guide shaft and a guide fixing block, the guide shaft is installed on the guide fixing block, the end of the guide shaft forms the output end, and the part of the guide shaft located between the guide fixing block and the outer peripheral surface is sleeved with a spring.

[0018] As in one embodiment of the present invention, the output end is provided with a positioning pin clamping piece to clamp the positioning pin.

[0019] As in one embodiment of the utility model, the concentric positioning installation device includes a locking rod and a push rod, the locking rod is threadedly connected and passes through the guide block to press against the test piece, and the push rod cooperates with the locking rod to press against the other side of the test piece.

[0020] As in one implementation manner of the present utility model, the concentric positioning installation device is used for an asphalt mixture performance testing machine, and the test piece is a test piece of asphalt mixture.

[0021] It can be seen from the above technical solution that the advantages and positive effects of the concentric positioning installation device of the utility model are:

[0022] In the utility model, the synchronous wheel drives the synchronous connecting rod to move synchronously, and the output part symmetrically and synchronously adheres the positioning pin to the test piece to achieve concentric positioning, thereby improving the simulation accuracy of the test process and the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the asphalt mixture performance testing machine in the utility model.

[0025] Figure 2 It is a structural schematic diagram of the concentric positioning installation device of the utility model.

[0026] Figure 3 for Figure 2 Schematic diagram of the A-direction cross-section.

[0027] Figure 4 It is a schematic diagram of the visual measurement state of the test piece of the utility model.

[0028] Figure 5 It is a schematic diagram of the cross-sectional structure of the test piece of the utility model in the test state.

[0029] Figure 6 It is a schematic diagram of the overall structure of the asphalt mixture performance testing machine in the utility model in the testing state.

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the positioning pins arranged on the test piece in the utility model.

[0031] Figure 8 It is a schematic diagram of the top view of the structure in which the positioning pins are arranged on the test piece in the utility model. DETAILED DESCRIPTION

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0033] In the following description of different examples of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "top", "bottom", "front", "rear", "side" and the like may be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0034] Figure 1 It is a schematic diagram of the overall structure of the asphalt mixture performance testing machine in the utility model.

[0035] Figure 2 It is a structural schematic diagram of the concentric positioning installation device of the utility model.

[0036] Figure 3 for Figure 2 Schematic diagram of the A-direction cross-section.

[0037] Figure 4 It is a schematic diagram of the visual measurement state of the test piece of the utility model.

[0038] Figure 5 It is a schematic diagram of the cross-sectional structure of the test piece of the utility model in the test state.

[0039] Figure 6 It is a schematic diagram of the overall structure of the asphalt mixture performance testing machine in the utility model in the testing state.

[0040] Figure 7 It is a schematic diagram of the three-dimensional structure of the positioning pins arranged on the test piece in the utility model.

[0041] Figure 8 It is a schematic diagram of the top view of the structure in which the positioning pins are arranged on the test piece in the utility model.

[0042] like Figures 1 to 8 As shown, the utility model provides an asphalt mixture performance testing machine, comprising:

[0043] The machine body 1 is provided with an upper loading platform 13 and a lower loading platform 12 . The asphalt mixture test piece 5 to be tested is placed on the lower loading platform 12 and clamped between the upper loading platform 13 and the lower loading platform 12 .

[0044] The hydraulic system 3 includes a hydraulic station 32, a hydraulic cylinder 2 and a high-frequency solenoid valve 31. The hydraulic station 31 provides hydraulic power for the hydraulic cylinder 2. The high-frequency solenoid valve 31 controls the movement direction of the hydraulic cylinder 2. The piston rod 21 of the hydraulic cylinder 2 is connected to the unloading platform 12 and can drive the unloading platform 12 to move up and down.

[0045] The control system 4 includes a control card 41, a controller 42 and a sensor 51. The controller 42 is communicatively connected to the control card 41. The control card 41 is communicatively connected to the high-frequency solenoid valve 31. The sensor 51 is arranged on the action component and the test piece 5. The controller 42 sends an action instruction to the high-frequency solenoid valve 31 through the control card 41, and receives the feedback value of the sensor 51 at the same time, so that the control system forms a closed-loop control of the signal. The action component can be the piston rod 21.

[0046] As in one embodiment of the present invention, the control system uses a PID algorithm to cause both ends of the test piece 5 to be subjected to a sinusoidal pressure wave.

[0047] As in one embodiment of the present invention, after the test piece is subjected to sinusoidal stress, sinusoidal strain is generated, and the dynamic modulus and phase angle of the test piece are calculated by analyzing the stress-strain relationship.

[0048] As in one embodiment of the present invention, the feedback signal in the control system is provided by an external ADC module.

[0049] As an embodiment of the present invention, the machine body 1 includes a three-axis positioning structure, which is connected between the upper stage 13 and the lower stage 12, and can allow the upper stage 13 and the lower stage 12 to move coaxially relative to each other up and down in a vertical plane.

[0050] As in one embodiment of the present invention, the three-axis positioning structure includes three vertically arranged guide shafts 14 , the lower ends of the guide shafts 14 are fixedly connected to the lower stage 12 , the upper ends of the guide shafts 14 pass through the upper stage 13 , and are slidably connected to the upper stage 13 .

[0051] As in one embodiment of the present invention, three guide shafts 14 are evenly arranged in the circumferential direction.

[0052] As in one embodiment of the present invention, the sensor includes a pressure sensor, a position sensor and a strain sensor. The pressure sensor is arranged between the piston rod 21 and the lower stage 12, the position sensor is arranged at the bottom of the piston rod 21, and the strain sensor is arranged around the test piece 5.

[0053] As in one embodiment of the present invention, there are three strain sensors 51 , which are evenly arranged at equal angles along the circumferential direction.

[0054] As in one embodiment of the utility model, positioning pins 6 are provided on the test piece 5, and there are three groups of positioning pins 6. The three groups of positioning pins 6 are evenly arranged at equal angles along the circumferential direction of the test piece 5, and each group of positioning pins 6 includes an upper and a lower piece. A fixing clip is connected to each positioning pin 6, and a support frame is connected to the fixing clip. A strain sensor 51 is installed between the two support frames.

[0055] As in one embodiment of the present invention, the locating pin 6 is evenly fixed and bonded to the outer circumference of the test piece 5 by a concentric positioning installation device 8. The concentric positioning installation device 8 includes three groups of synchronously concentrically moving output parts 84, and the output parts 84 press the locating pin 6 against the test piece 5.

[0056] As an embodiment of the present utility model, the concentric positioning installation device comprises:

[0057] The frame 80 is a cylindrical shell, including an outer peripheral surface 801, an upper end surface 802 and a base 803. The test piece 5 is arranged between the upper end surface 802 and the base 803 and is coaxial with the frame 80;

[0058] The synchronous wheel 81 is rotatably mounted on the upper end surface 802 and is coaxial with the frame 80. The synchronous wheel 81 is provided with more than two sets of synchronous connecting rods 82. The two or more sets of synchronous connecting rods 82 are evenly distributed and the symmetry center is located on the axis of the synchronous wheel 81.

[0059] Guide blocks 83, there are two or more guide blocks 83, corresponding to the synchronous connecting rods 82 one by one, and fixedly arranged at the ends of the synchronous connecting rods 82, located on the inner side of the outer peripheral surface, and the symmetry center is located on the center line of the frame 80;

[0060] Output part 84, there are more than two output parts 84, corresponding one to one with the guide block 83, the output part 84 passes through the outer peripheral surface 801 and the guide block 83 at the same time, the radial output position of the output part 84 is determined, and the output end of the output part 84 is connected to a positioning pin 6, and the positioning pin 6 is synchronously bonded to the test piece 5 under the drive of the output part 84.

[0061] As in one embodiment of the present invention, the outer peripheral surface of the frame 80 is a hollow structure.

[0062] As in one embodiment of the present invention, there are three synchronous connecting rods 82, guide blocks 83 and output parts 84, the output part 84 includes two layers of output ends, and there are six positioning pins 6, which correspond to the output ends one by one.

[0063] As in one embodiment of the present invention, the concentric positioning and installation device 8 further includes a lifting and pressing column 86 and an upper pressing plate. The lifting and pressing column 86 passes through the axial hole of the synchronous wheel 81 and is connected to the upper pressing plate, and the upper pressing plate presses against the test piece 5.

[0064] As in one embodiment of the present invention, a guide seat 87 is sleeved on the outer side of the lifting and lowering column 86 , and the guide seat 87 is located above the synchronous wheel 81 .

[0065] As in one embodiment of the present invention, the synchronous connecting rod 82 is L-shaped, one end of which is connected to the synchronous wheel 81 , and the other end of which is cantilevered and protrudes from the outer side of the synchronous wheel 81 .

[0066] As in one embodiment of the utility model, the output portion 84 includes a guide shaft 842 and a guide fixing block 841, the guide shaft 842 is installed on the guide fixing block 841, the end of the guide shaft 842 forms an output end, and the portion of the guide shaft 842 located between the guide fixing block 841 and the outer peripheral surface 801 is sleeved with a spring 843.

[0067] As in one embodiment of the present invention, a positioning pin clamping piece is provided at the output end to clamp the positioning pin 6 .

[0068] As in one embodiment of the present invention, the concentric positioning installation device 8 includes a locking rod 88 and a push rod 89. The locking rod 88 is threadedly connected and passes through the guide block 83 to press against the test piece 5. The push rod 89 cooperates with the locking rod 88 to press against the other side of the test piece 5.

[0069] As in one embodiment of the present invention, the upper loading platform 13 and the lower loading platform 12 are buckled in an environmental room, and a temperature control system is provided in the environmental room.

[0070] As in one embodiment of the present invention, the temperature control system includes a water cooling device, which includes a water cooling tank, a refrigerant and a cooling fin. The water cooling tank has a water inlet and outlet, circulates with a refrigerator, and has a built-in cooling fin to provide a cold source; a heating tube is installed in the cooling fin; and fans are evenly distributed on the cooling fins.

[0071] The process includes the following parts:

[0072] 1. Apply a sinusoidal axial compressive stress test load to the specimen.

[0073] 2. Use the pressure sensor for closed-loop feedback and obtain the actual pressure value at the same time.

[0074] 3. The pressure value divided by the cross-sectional area of ​​the test piece is the stress on the test piece.

[0075] 4. When the test piece receives pressure, it will deform, and the deformation waveform is the same as the pressure waveform.

[0076] 5. The deformation divided by the total height of the test piece is the strain value.

[0077] 6. Stress / strain = dynamic modulus.

[0078] 7. Stress and strain are waveforms with the same frequency, but due to different materials, there is a phase difference between the two waveforms. The phase difference can be obtained by comparing the two waveforms.

[0079] 8. The size of the dynamic modulus reflects the strength of the material.

[0080] 9. Phase difference response material obtains elastic properties.

[0081] As in one embodiment of the present invention, the sensor 51 includes a pressure sensor, a position sensor and a strain sensor. The pressure sensor is arranged between the piston rod 21 and the lower stage 12, the position sensor is arranged at the bottom of the piston rod 21, and the strain sensor is arranged around the test piece 5.

[0082] Three strain sensors (Lvdt1, Lvdt2, Lvdt3) are installed around the test piece 5 at 120°. An environmental box 11 is installed on the work surface to control the temperature and ensure that the test piece 5 is provided with a temperature environment that meets the requirements; the PC software in the controller 42 sends the required instructions to the control card 41. The control card 41 controls the action of the high-frequency solenoid valve 31 and receives feedback values ​​from the pressure sensor, the spindle position sensor, and the Lvdt1..3 sensors. The test piece 5 is positioned synchronously through the concentric positioning installation device 16 to achieve precise positioning.

[0083] As in one embodiment of the present invention, there are three strain sensors, which are evenly arranged at equal angles along the circumferential direction.

[0084] As in one embodiment of the present invention, the controller 42 is disposed in a computer, and the sensor 51 inputs the signal into the computer through an acquisition card.

[0085] As in one embodiment of the present invention, the high-frequency solenoid valve 31 is an electro-hydraulic proportional valve, the input control signal of the electro-hydraulic proportional valve is in direct proportion to the output oil pressure, and the output hydraulic value of the high-frequency solenoid valve 31 is controlled by the signal input value sent by the control card 41.

[0086] For the mechanical testing instrument developed by the present invention, the control accuracy of the pressure wave is the key core. Only when the load waveform applied to the test piece 5 is sufficiently close to the set standard waveform, the actual working condition of the instrument will fully conform to the data processing model.

[0087] The core components for achieving high-precision control are mainly high-frequency solenoid valve 31, control card 41 and pressure sensor 51. High-frequency solenoid valve 31 is an electro-hydraulic proportional valve. The valve input control signal is proportional to the output oil pressure. The output hydraulic pressure value of high-frequency solenoid valve 31 is controlled by the signal input value given by control card 41. Pressure sensor 51 converts the pressure on test piece 5 into electrical signal in real time, which is input into control computer through acquisition card to form a closed-loop control of control-signal input.

[0088] After the actuator control and feedback form a closed loop, the PID control method is introduced to achieve precise air pressure control. PID control is a digital control algorithm based on the proportional, integral, and derivative control theories. It adjusts the response of the system by adjusting the three PID parameters to give the system good dynamic characteristics and steady-state performance. The essence of integration is to integrate the error signal to gradually reduce the integral error and make the system more stable. The essence of differentiation is to prevent the system from over-responding to external interference. The PID control principle is to adjust the proportional gain according to the deviation between the output value and the input value so that the system can reach the input set value. When the deviation between the output and the input increases, the proportional gain is increased. Conversely, when the deviation between the output and the input is small, the proportional gain is reduced.

[0089] There are two types of PID algorithms: one is position type and the other is incremental type. Pressure wave control uses incremental type, and its incremental formula is:

[0090] PID=Uk+KP*[E(k)-E(k-1)]+KI*E(k)+KD*[E(k)-2E(k-1)+E(k-2)]

[0091] In the formula, E(k) represents the current error, E(k-1) represents the error at the previous moment, and E(k-2) represents the error at the moment before E(k-1). The error data is updated in real time during the calculation process.

[0092] The pressure wave control algorithm is implemented using the STM32F407 series microcontroller. The STM32F407 is a 32-bit high-performance ARM Cortex-M4 processor with a system clock of up to 168MHz. It supports FPU (floating point unit) and DSP instructions.

[0093] In order to ensure the sampling accuracy, the feedback signal in the pressure wave control system is provided by an external ADC module, which has a sampling accuracy better than 4 / 10,000, thus ensuring the sampling accuracy.

[0094] In this experiment, the test piece 5 was subjected to controlled sinusoidal compressive stress of different frequencies at a specific test temperature. The applied stress and the resulting axial strain were measured as a function of time and used to calculate the dynamic modulus and phase angle. The dynamic modulus is used to evaluate the performance of asphalt mixtures, characterize and evaluate the stiffness of asphalt mixtures, and is used for mechanical empirical design of pavements. The dynamic modulus curve is drawn for pavement structure design, and can also be used to analyze the causes of pavement cracking. The flow value is a property related to the resistance of asphalt mixture pavements to permanent deformation, and is used to evaluate and design the ability of asphalt mixture pavements to resist permanent deformation. The damage characteristic curve can reflect the basic relationship between damage and integrity of asphalt mixtures, and this characteristic is independent of temperature, frequency and loading mode. Combined with the linear viscoelastic properties of asphalt mixtures, the damage characteristic curve can be used to evaluate the fatigue properties of asphalt mixtures. Combined with fatigue failure principles and corresponding pavement models, the fatigue properties of in-service pavements can be predicted.

[0095] As in one embodiment of the utility model, the upper stage 13 and the lower stage 12 are mutually guided and connected by the guide shaft 14, so that the upper stage 13 and the lower stage 12 can only move up and down relative to each other. The utility model adopts three columns to install circular plates 15 / 16 on the upper and lower parts to ensure that the hydraulic body is installed at the bottom of the concentric lower plate, and the hydraulic rod is extended to apply the loading force. The hydraulic rod is installed with a pressure sensor, and the bottom plate of the test piece fixing plate is filled with oil sealing grooves, and the outer surface is installed with sealing rings. The environmental box 11 can automatically rise and fall through pneumatic control, and the cavity is kept sealed after falling. The guide shaft 14 adopts three-axis vertical positioning to ensure concentricity more stably. The inner wall and outer annular surface of the upper and lower fixed rings are processed with sealing grooves and installed with sealing rings. The outer sealing ring contacts the inner wall of the outer perspective cover, and the inner sealing ring contacts the inner perspective cover to ensure the sealing of the double-layer perspective cover. The double-layer perspective cover can be vacuumed, which is easier to control temperature and keep warm.

[0096] The environmental chamber 11 adopts a temperature control system, which uses a water cooling device, wherein the water cooling tank has a water inlet and outlet, and circulates with the refrigerator. The water cooling tank has a built-in cooling plate to provide a cold source; the heat dissipation fins are installed with heating pipes; the fins are evenly distributed with fans, and the chamber is evenly cooled. The program controls the start and stop of the refrigerator, the cooling plate, and the heating pipe to ensure the cooling rate and reach the low temperature required for the experiment.

[0097] The sensor 51 installed on the test piece 5 of the utility model also includes the following contents:

[0098] 1. Install the refrigeration assembly upper water tank plate on the loading axis to ensure the center position.

[0099] 2. The lower loading is installed at the center of the upper plate of the rack assembly.

[0100] 3. During the test, the upper loading plate is placed on the upper surface of the specimen to ensure concentric position.

[0101] 4. The circumferential surface of the test piece needs to be evenly bonded with the positioning block.

[0102] 5. Install the LVDT displacement sensor on the axial positioning block and monitor the displacement changes during the experiment.

[0103] In the utility model, the positioning pins are evenly bonded to the circumferential surface of the test piece 5 to ensure uniform distribution of the positions. The test piece is placed in the center of the fixed sleeve, and a positioning step hole is left at the lower base to ensure concentric positioning. The three-link rod moves toward the center of the circle at the same time to ensure that the positioning pins are in contact and bonded with the test piece 5. Finally, the upper pressure plate is pressed down to the surface of the test piece 5. The bonding position of the positioning pins and the test piece is highly and evenly distributed, which is very important for dynamic experimental data. The dynamic experimental displacement change is within 1mm.

[0104] Generally speaking, in one embodiment of the present invention, the following parts are included:

[0105] 1. Pressure load part (hydraulic cylinder, hydraulic valve, etc.); apply pressure to the test piece and control the hydraulic cylinder through the hydraulic valve.

[0106] 2. Simulate the ambient temperature part (high temperature and low temperature realization methods); control the temperature of the test environment of the test piece through the temperature control part.

[0107] 3. Strain measurement part (main axis displacement, secondary axis displacement); the strain of the test piece and the displacement of the piston rod are measured by sensors and transmitted to the control system.

[0108] 4. Test piece installation part (design of concentric positioning installation device); the test piece needs to be accurately positioned, and its accurate position is ensured by a sophisticatedly designed concentric positioning installation device.

[0109] 5. Hydraulic station part (hydraulic station main body, hydraulic station cooling); the hydraulic station provides power for the pressure load part.

[0110] 6. Method for opening and closing the environmental chamber (cylinder); opening and closing are achieved through automatic lifting to improve the degree of automated control.

[0111] It can be seen from the above technical solution that the advantages and positive effects of the asphalt mixture performance testing machine of the utility model are:

[0112] In the utility model, a high-frequency solenoid valve 31 is used to control the hydraulic cylinder 2 to drive the lower platform 12 to extrude the test piece 5, and a command is sent to the high-frequency solenoid valve 31 through the control card 41, thereby improving the automatic control level of the test process and the accuracy of the test data.

[0113] A person skilled in the art of the present invention should understand that the specific structures and processes shown in the above specific implementations are merely exemplary and not restrictive. Moreover, a person skilled in the art of the present invention can combine the various technical features shown above in various possible ways to form a new technical solution, or make other changes, which are all within the scope of the present invention.

Claims

1. A concentric positioning installation device, characterized in that: include: A frame, wherein the frame is a cylindrical shell, comprising an outer peripheral surface, an upper end surface and a base, and the test piece is arranged between the upper end surface and the base and is coaxial with the frame; A synchronous wheel, the synchronous wheel is rotatably mounted on the upper end surface and is coaxial with the frame, and the synchronous wheel is provided with more than two sets of synchronous connecting rods, and the more than two sets of synchronous connecting rods are evenly distributed and the symmetry center is located on the axis of the synchronous wheel; Guide blocks, the number of the guide blocks being more than two, corresponding one to the synchronous connecting rods, and fixedly arranged at the ends of the synchronous connecting rods, located on the inner side of the outer peripheral surface, and the symmetry center being located on the center line of the frame; Output part, there are more than two output parts, corresponding to the guide blocks one by one, the output part passes through the outer peripheral surface and the guide block at the same time, the radial output position of the output part is determined, and a positioning pin is connected to the output end of the output part, and the positioning pin is synchronously adhered to the test piece under the drive of the output part.

2. The concentric positioning installation device according to claim 1, characterized in that: The outer peripheral surface of the frame is a hollow structure.

3. The concentric positioning installation device according to claim 1, characterized in that: There are three synchronous connecting rods, three guide blocks and three output parts. The output part includes two layers of output ends, and there are six positioning pins, which correspond to the output ends one by one.

4. The concentric positioning installation device according to claim 1, characterized in that: The concentric positioning installation device also includes a lifting and lowering pressure column and an upper pressure plate. The lifting and lowering pressure column passes through the axial hole of the synchronous wheel and is connected to the upper pressure plate. The upper pressure plate presses against the test piece.

5. The concentric positioning installation device according to claim 4, characterized in that: A guide seat is also sleeved on the outer side of the lifting and lowering column, and the guide seat is located above the synchronous wheel.

6. The concentric positioning installation device according to claim 1, characterized in that: The synchronous connecting rod is L-shaped, one end of which is connected to the synchronous wheel, and the other end of which is cantilevered and protrudes from the outer side of the synchronous wheel.

7. The concentric positioning installation device according to claim 1, characterized in that: The output part includes a guide shaft and a guide fixing block, the guide shaft is installed on the guide fixing block, the end of the guide shaft forms the output end, and the part of the guide shaft located between the guide fixing block and the outer peripheral surface is sleeved with a spring.

8. The concentric positioning installation device according to claim 7, characterized in that: The output end is provided with a positioning pin clamping piece to clamp the positioning pin.

9. The concentric positioning installation device according to claim 1, characterized in that: The concentric positioning installation device includes a locking rod and a push rod. The locking rod is threadedly connected and passes through the guide block to press against the test piece, and the push rod cooperates with the locking rod to press against the other side of the test piece.

10. The concentric positioning installation device according to any one of claims 1 to 9, characterized in that: The concentric positioning installation device is used for an asphalt mixture performance testing machine, and the test piece is a test piece of an asphalt mixture.

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