CN114776313A - A kind of anti-sludge cake steel plate for shield cutter head and a simulation test bench for testing its characteristics - Google Patents

Abstract

The invention relates to a testing device of shield construction equipment, in particular to a mud cake preventing steel plate for a shield cutter head and a simulation experiment table for testing the characteristics of the steel plate. The problem of the shield constructs the mud cake and influences the mud outflow on the tool bit among the prior art, and then influences whole operating condition is solved. The shield cutter head is arranged on a shield cutter head, the shape and the position of the front cutter face of the cutter head on the cutter head are consistent with the shape and the position of the front cutter face of the cutter head on the cutter head, the front cutter face and the front cutter face are connected through bolts, the steel plate is made of molybdenum-vanadium alloy or Q235/Q245 through modification, and the surface finish degree of the upper surface is less than 0.1. Has the advantages that: the cutter head is equivalently provided with the toughened film which is beneficial to slurry sliding, and the toughened film is provided with a set of detection platform, so that the toughened film can be adjusted and replaced in real time under different working conditions.

Description

An anti-sludge cake steel plate for shield cutter head and a simulation test bench for testing its characteristics

technical field

The invention relates to a testing device for shield construction equipment, in particular to an anti-mud cake steel plate for shield cutter head and a simulation test bench for testing its characteristics.

Background technique

In the shield excavation operation, the strata at the top of the tunnel are mainly silty clay, silty sand, clay, breccia, and pebble soil. The strata that the tunnel passes through are: silty clay 16%, silty sand 11%, clay 8%, breccia 15%, pebble soil 5%, strongly weathered mudstone 25%, and moderately weathered mudstone 14% , moderately weathered gravel-bearing argillaceous sandstone accounts for 2%. There are also karsts in local locations.

Clay and strong to moderately weathered mudstone contain a large amount of viscous minerals and have strong soil adhesion. The viscous particles have a certain water-absorbing expansion and adsorption capacity. The clay under the cutting tool is easily attached to the cutter head panel and the opening position of the cutter head. The cohesive soil on the cutter head forms a mud cake on the cutter head panel under the action of extrusion, and the mud sticks to the opening of the cutter head, resulting in poor circulation in the warehouse, resulting in a decrease in the driving efficiency, and the shield tunneling length in the stratum containing clay and mudstone. More than 2400 meters, the prevention and control of mud cakes on the cutter head during the shield excavation process of this project is a major difficulty.

At this stage, the analysis and prediction of the mud cake data of the cutter head mainly focus on the simulation of on-site working conditions. The patent of the test device and method for the simulation of mud cake on the cutter head of the pressure-balanced shield. By simulating the excavation of the shield in a specific soil, adjusting the cutter arrangement and construction parameters, and observing the distribution and shape of the mud cake, so as to study the mud cake. The mechanism of the phenomenon and the prevention and disposal methods of the mud cake provide the basis. Another example is the application number CN 202110140730.1, which is called a simulation system for regulating the formation of mud cakes on shield cutter heads, which also provides a basis for mud cake prevention and disposal methods by simulating the cutter head.

However, the applicant believes that the current technology mainly lies in simulating the cutter head system, measuring the real-time temperature and pressure on the cutter head, and then improving the cutter head according to the sample situation. However, it is known in practice that the cutting angle on the cutter head, and Cutting temperature, the adjustable space is actually very low, and it is not completely suitable for adjustment most of the time.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problem in the prior art that the mud cake formed on the shield cutter head affects the outflow of mud, thereby affecting the overall working state.

The specific scheme of the present invention is:

Design a steel plate for shield cutter head, which is installed on the shield cutter head. The specific card is mounted on the rake face of the cutter head on the cutter head. The rake surfaces are connected by bolts, the steel plate is made of molybdenum vanadium alloy and one of Q235/Q245, and the upper surface smoothness is less than 0.1.

A simulation test bench for testing the characteristics of steel plates, including a test bench, the test bench includes a lower storage support area and an upper equipment inclination angle area, and the lower storage support area and the upper equipment inclination angle area are provided with hinge structure components connected. Hinged connection, a bidirectional motor-driven test board support table is installed in the inclination area of the upper equipment, the test board support table is installed on the portal bracket, and includes a bottom rotating shaft and a claw installed on the bottom rotating shaft. The claws clamp an experimental board with a length of 40 to 60 cm and a width of 40 to 60 cm;

The rotating shaft is installed on the top of the portal bracket via a bearing, and its input end is connected to the output shaft of the bidirectional motor. One is made, the upper surface finish is less than 0.1, and the lower storage support area is equipped with a stirring barrel, a sample box and several experimental boards to be tested. The sample box is a hollow cylindrical barrel with an inner diameter of less than 8cm.

In a specific implementation, the experimental board to be tested is vertically clamped in the lower storage support area.

In the specific implementation, the lower storage support area and the upper equipment inclination area are provided with an angle support measurement mechanism, and the angle support measurement mechanism includes a chute rod and a locking bolt, and the top end of the chute rod is connected and installed on the On the bottom edge of the inclination area of the upper equipment, the chute rod is provided with a chute, and the locking bolt passes through the chute and the horizontal slot and is fixed on the upper edge of the lower storage support area, on the chute Tick marks are provided to guide the installation angle of the lower storage support area and the upper equipment inclination range.

In a specific implementation, the bidirectional motor is further connected with a control mechanism, and the control mechanism is provided with a display screen and buttons to control the opening and closing, steering and rotation speed of the bidirectional motor.

In a specific implementation, the lower surface roughness of the experimental board is less than 0.16.

In the specific implementation, the edge of the experimental board is clamped with a tension meter positioning clip, the tension meter head is hung on the tension meter positioning clip, and the tail end is embedded in the sample box, and the tension meter positioning clip includes a [type]. The clip body and the roller inside the clip body are slidably mounted on the edge of the experimental board.

In a specific implementation, the surface area of the experimental board is marked with a marking line drawn by a marker or a marking line projected by an optical mechanism, and the optical mechanism includes a transverse light beam emitting grid-shaped optical lines, and a support column, the support column is clamped on the clamping claw.

The beneficial effects of the present invention are:

Different from the existing technology, it is the first time to study the mud cake, and then find the most suitable steel sheet for the mud cake of the current year according to the data of the mud cake. The tempered film itself has a set of detection platform, which can be adjusted and replaced in real time under different working conditions, which greatly improves the change space for changing the nature of the cutter head;

Specifically, the blade installed on the rake face of the cutter head, that is, the main working surface, can greatly reduce the adhesion of mud on the main cutting surface due to its excellent characteristics of low surface friction. It is suitable for different requirements of different excavation soil layers, and at the same time ensuring the cost, it can avoid the blockage caused by the reciprocating beating of the mud on the steel sheet to the greatest extent;

The double-sided design of the experimental board is convenient to improve the test efficiency and reduce the number of experimental boards;

The simulated test platform is simple in structure and occupies a small area. The operation can be realized by connecting the circuit. It has low requirements on the test site, and the test can basically produce the results on the spot, and the test time is short;

The cutting surface of the shield cutter head can be simulated from multiple angles to ensure the accuracy of the test results.

The operation console can measure multiple sets of data at the same time, and has various functions.

Description of drawings

Fig. 1 is the front view of the structure of the present invention;

Fig. 2 is the top view of the structure of the present invention;

Fig. 3 is the left side view of the structure of the present invention;

Fig. 4 is the right side view of the structure of the present invention;

Fig. 5 is the rear view of the structure of the present invention;

Fig. 6 is the rear view of another state in the present invention;

Fig. 7 is a perspective view of the present invention;

Fig. 8 is the perspective view of another angle in the present invention;

Figure 9 is a schematic diagram of the cutter head of the blade positions involved;

Fig. 10 is a perspective view of another measurement state in the present invention

Fig. 11 is the relationship curve of the influence of inclination angle on the inclination angle of clay sliding initiation;

Fig. 12 is the relationship curve of the influence of multi-material dip angle on the clay sliding initiation dip

Fig. 13 is the fitting relationship between K and the critical speed of slippage of steel plate clay;

The name of each part in the figure: 1. Rake face; 2. Lower storage support area; 3. Upper equipment inclination area; 4. Hinge structural components; 5. Control mechanism;

21. Experiment board support table; 22. Bidirectional motor; 23. Door bracket; 24. Bottom rotating shaft; 25. Claw; 26. Experiment board; 27. Bearing;

31. Locking bolt; 32. Chute; 33. Horizontal groove; 34. Experiment board mounting clip; 35. Mixing bucket; 36. Sample box mounting plate;

6. Sample box; 7. Tensile gauge; 8. Tensile gauge positioning clip; 9. Optical mechanism; 10. Plate; 11. Mud trace

81. Clip body; 82. Roller;

91. Support column; 92. Transverse beam.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

Example 1

A kind of steel plate for shield cutter head, see Fig. 1 to Fig. 9, is installed on the shield cutter head, and is specifically mounted on the rake face 1 of the cutter head on the cutter head, and the rake face of the cutter head on the cutter head The shape and size are the same, and the rake face is connected by bolts. The steel plate is made of molybdenum vanadium alloy and one of Q235/Q245, and the upper surface finish is less than 0.1.

It also relates to a simulation test bench for testing the properties of steel plates, including a test bench, the test bench includes a lower storage support area 2 and an upper equipment inclination angle area 3, the lower storage support area and the upper equipment inclination angle section are provided with hinges The hinged connection of the structural components 4 is connected, and the test board support table 21 driven by the bidirectional motor 22 is installed in the inclination area of the upper equipment. a jaw 25 installed on the bottom rotating shaft 24, the jaw 25 clamps an experimental board 26 with a length of 40 to 60 cm and a width of 40 to 60 cm;

The rotating shaft 24 is mounted on the top of the portal support via a bearing 27, and its input end is connected to the output shaft of the bidirectional motor. Made of one of Q235/Q245, the upper surface finish is less than 0.1, and the lower storage support area is equipped with a stirring bucket 35, a sample box 6 and a number of experimental boards to be tested. The sample box 6 is a hollow cylindrical barrel with an inner diameter of less than 8cm.

The experimental board to be tested is vertically clamped in the lower storage support area

The lower storage support area and the upper equipment inclination area are provided with an angle support measurement mechanism, the angle support measurement mechanism includes a chute rod and a locking bolt 31, and the top of the chute rod is connected to the upper equipment through a rotating shaft. On the bottom edge of the inclination area, the chute rod is provided with a chute 32, and the bottom frame of the inclination area of the upper equipment is provided with a horizontal groove 33, and the locking bolt passes through the chute and the horizontal groove and is fixed to the lower storage support On the upper edge of the area, the chute 32 is provided with a graduation line to guide the installation angle of the lower storage support area and the upper equipment inclination area.

The bidirectional motor 22 is also connected with a control mechanism 5, and the control mechanism is provided with a display screen and buttons to control the opening and closing, steering and rotation speed of the bidirectional motor.

The lower surface smoothness of the experimental board is less than 0.16.

A tension meter positioning clip is clamped on the edge of the experimental board, the head of the tension meter 7 is hung on the tension meter positioning clip 8 , and the tail end is embedded in the sample box 6 . The tension meter positioning clip includes a type clip body and a roller 72 slidably mounted on the edge of the experimental board in the clip body.

The surface area of the test board is marked with a marking line drawn by a marker or a marking line projected by an optical mechanism 9, and the optical mechanism 9 includes a transverse light column that emits grid-shaped optical lines, and supports on both sides of the transverse light column 92. A column 91 , the support column 91 is clamped on the claws 25 . The form of card installation is the opposite card installation in the form of face-to-face.

The present embodiment also relates to the following test method when the simulated test bench for testing the properties of the steel plate works, including the following steps:

(1) Clay preparation: (a) Weigh 300g of natural clay or simulated shield on-site cost clay, and pour it into a mixing bucket; (b) Weigh 20g of grade II bentonite, pour it into the above mixing bucket, and stir evenly; ( c) Measure 100ml of tap water with a measuring cylinder, slowly pour it into the above mixing bucket, and stir evenly; (5) Put the prepared clay into a dry sample box, and weigh the total mass of the clay and the sample box;

(2) Clay sliding start angle test: (a) Adjust the multifunctional steel plate clamping device so that the installation inclination of the experimental plate is first adjusted to 0°, and then place the sample box containing the clay on the upper part of the steel plate surface; (b) Through the control system of the multi-functional steel plate clamping device, the rotation angle of the steel plate is gradually adjusted until the clay starts to rotate on the surface of the steel plate, the sliding start angle is recorded, and the pulling force of the tension meter is measured at the same time, which is converted into the friction force between the steel plate and the clay through calculation. ; (c) Use the same steps to adjust the installation inclination of the steel plate to 5° and 10° respectively, repeat the test, and record the data to obtain the clay start angle and start tensile test data;

(3) Data analysis, the influence of the installation inclination angle on the starting angle is obtained, and the steel plate material suitable for the on-site working conditions is selected as the tool.

The moving pair connection ensures that the roller group can move linearly on the base plate, so as to adjust the distance between the rollers in the roller group and adapt to the measurement of the stator and rotor of different sizes of the motor.

During the working process, two different types of mirror steel plates are used, namely Q345 steel plate and molybdenum vanadium alloy. Each steel plate has two different finishes, positive and negative. The multi-functional steel plate clamping device is used to adjust the steel plate to different angles. Fix, record the starting angle of the clay sliding on the surface of the steel plate, the speed of sliding and the amount of mud retained. At the same time, the tensile force of the clay sliding when the clay is sliding is tested with a tension meter, and it is converted into the sliding friction force of the steel plate. First make clay, or sample the discharged muddy soil of the construction layer, and then measure it on different experimental boards to measure its sliding angle, especially the static friction angle and sliding tension. After the most suitable experimental plate material is determined, the steel plate of the same material is selected to be installed on the blade, which can complete the conversion from experiment to actual combat, realize the smooth output of mud during the excavation process, and prevent material blockage caused by jumping.

The following is an example of a single working process:

First, prepare the clay: (1) Weigh 300g of natural clay and pour it into the mixing bucket; (2) Weigh 20g of grade II bentonite, pour it into the above mixing bucket, and stir evenly;

3) Measure 100ml of tap water with a graduated cylinder, slowly pour it into the above mixing bucket, and stir evenly; 4) Put the prepared clay into a dry sample box, and weigh the total mass of the clay and the sample box.

Second, the clay sliding start angle test is performed.

When working, adjust the inclination area of the upper equipment, so that the installation inclination of the specially processed experimental plate is first adjusted to 0°, and then the sample box containing the clay is placed on the upper part of the steel plate surface; (2) Through the control system, gradually adjust the steel plate until the clay starts to rotate on the surface of the steel plate, record the sliding start angle, and at the same time measure the tension of the dynamometer, and convert it into the friction force between the steel plate and the clay through calculation; (3) Use the same steps to make the installation inclination angle of the steel plate Adjust to 5° and 10° respectively, repeat the test, and record the data. The specific data are shown in Table 1.

Table 1 Clay starting angle and starting tensile test data

After data analysis:

Based on the experimental data, the influence of the installation inclination angle on the clay sliding initiation angle was analyzed. It was found that under the experimental conditions, with the increase of the installation inclination angle, the clay sliding initiation inclination angle gradually decreased, that is, with the increase of the installation inclination angle, the It is more and more favorable for the clay to slip off the surface of the steel plate. As shown in Figure 11, with Q345 steel plate, Ra0.012 as the representative, the relationship between the installation inclination angle and the inclination angle of the clay sliding start is drawn.

Further, the influence of steel properties on the starting angle can be analyzed:

The characteristics of the steel studied in this study mainly include the influence of the type of the steel and the finish. According to the data analysis, as shown in Figure 4, by comparing the curve Q345 (Ra0.012) with the curve Q345 (Ra0.2), the molybdenum vanadium alloy curve (Ra0 .012) Compared with the curve (Ra0.2), it can be concluded that for the same steel, when the smoothness is different, the starting inclination of the clay sliding has a greater impact, that is, the better the smoothness, the more the starting angle is under the same conditions. Small, that is, under the same sliding length, it can buy more time for the clay to slide on the steel plate; by comparing the curve Q345 (Ra0.012) with the molybdenum vanadium alloy curve (Ra0.012), the curve Q345 (Ra0.2) Compared with the molybdenum-vanadium alloy curve (Ra0.2), it can be concluded that the molybdenum-vanadium alloy steel plate has better anti-mud cake effect than the Q345 steel plate for different steels with the same finish. The molybdenum vanadium alloy can be specifically Cr12, Cr16, Cr20, and Q235 can also be replaced by Q225 and Q245.

Furthermore, an analysis of the influence of steel properties on the clay sliding friction is carried out.

In view of the fact that the sliding friction force of the indoor test steel plate against the clay is not easy to obtain directly, the method of directly measuring the sliding force of the clay is adopted, and the friction force when the clay slides is converted according to F _{sliding force} = F _{pulling force} + F _friction force. That is, when the sliding force is constant, the greater the measured tensile force, the smaller the friction force received by the clay sliding down, and the less likely it is to form a mud cake. In order to facilitate the calculation, this analysis is carried out with the installation inclination angle of 0°. The total mass of the clay box sample box is 286g. The specific tensile test data and calculated friction force are shown in Table 4. Through Q345 (Ra0.012) and Q345 (Ra0.2) friction data comparison, and molybdenum-vanadium alloy (Ra0.012) and molybdenum-vanadium alloy (Ra0.2) friction data comparison shows that the same steel plate, the higher the finish, the smaller the friction; through Q345 (Ra0.012) and molybdenum-vanadium alloy (Ra0.012) friction data comparison, and Q345 (Ra0.2) and molybdenum-vanadium alloy (Ra0.2) friction data comparison shows that when the finish is the same, molybdenum-vanadium alloy steel plate The friction force on the upper clay is less than that on the Q345 steel plate. The test process is shown in Figure 5.

Table 2 Friction statistics of different materials and smooth surfaces at an installation inclination of 0°

Further, a test and analysis of the influence of the cutter head rotation speed on the mud cake was carried out.

5.2.1 Test procedure

(1) Weigh the prepared clay, fix the contact area between the clay and the steel plate, make sure that the contact area is the same for each test, and then press the clay with the same force to make the clay and the steel plate stick together;

(2) Adjust the multi-function steel plate clamping device to rotate at different speeds to record the sliding of the clay on the steel plate;

(3) Weigh clays of different masses and repeat the above test.

5.2.2 Data Analysis

Through the above tests, the data of the influence of the cutter head speed on the sliding of different qualities of clay for the same steel plate and the same finish were obtained, and the experimental phenomena were recorded. The test data are shown in Table 3. From the analysis of the data in the table, it can be seen that for a fixed mass per unit area, the faster the steel plate rotates, the less conducive it is to the slipping of clay, the easier it is to accumulate, and the formation of mud cakes. During the 0-360° rotation, it will swing back and forth without falling off. When the speed of the steel plate is below the critical speed, the soil will slide down from the edge of the steel plate during the 0-180° rotation.

Table 3 Statistical table of the influence of steel plate speed on clay sliding

Since the contact area of different qualities of clay and steel plate is the same, the corresponding relationship between the clay mass per unit area and the speed of the steel plate can be formed, so as to provide a parameter basis for the setting of the tunnel penetration and the speed of the cutter head of the on-site shield machine. In this scheme, the contact area between the clay and the steel plate is fixed at 50cm ² , and the mass of clay per unit area is set to be represented by the symbol K. Based on the data in Table 3, a one-to-one correspondence between K and the critical speed of clay slippage from the steel plate is formed, as shown in Table 4. . Figure 13 shows the fitting relationship between K and the critical speed of slippage of steel plate clay.

Table 4 Corresponding relationship between K and the critical speed of slippage of steel plate clay

Based on the data in Table 4, the data is fitted, and the processing result is shown in Figure 12. The curve is approximately a straight line.

In specific work, a board is built over the lower storage support area to catch the falling mud cake.

Finally, for the case of using clay as the material, the experimental conclusions and suggestions are drawn.

(1) For different installation inclination angles of the same steel plate, the larger the installation inclination angle, the smaller the starting angle of clay sliding, which is more conducive to the discharge of clay. It is recommended to increase the slope angle of the steel at the opening of the cutter head appropriately under the condition of ensuring the strength of the opening of the cutter head.

(2) For the different smoothness of the same steel plate, the higher the surface smoothness and the same installation inclination, the smaller the clay sliding start angle, the more conducive to the discharge of clay soil slag. It is recommended that the rough steel plate surface at the opening of the cutter head of the existing shield machine be equipped with a mirror steel plate with a high gloss finish, and field tests are carried out.

(3) Through the comparison of the Q345 steel plate and the molybdenum-vanadium alloy steel plate test, the molybdenum-vanadium alloy steel plate has better performance than the Q345 steel plate in terms of anti-sludge cake, but compared with the traditional steel rough surface, both steels can reflect a clear advantage. It is recommended to install two kinds of steel plates for testing at the position where the cutter head is supported on site, so as to judge which material is more economical and reasonable to use later.

(4) The rotation speed of the cutter head has a great influence on the slippage of the clay on the steel plate. For a certain mass of clay per unit area, when the rotation speed of the cutter head is below the critical speed, the clay can smoothly slide down from the edge of the steel plate. Above the critical speed, the sticking is manifested as swinging left and right with the 360° rotation of the steel plate, and it is not easy to slip off the surface of the steel plate. It is recommended to adjust the speed of the cutter head in a timely manner according to the amount of slag when the site is excavated to the formation prone to mud cake.

In the specific implementation, following the above method, targeted conclusions can be drawn for different soil conditions, so as to combine cost control, select the most suitable material as the steel sheet to lay on the main cutting surface of shield cutting, adjust and improve Mud left channel condition.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the The technical solutions described in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. The utility model provides a shield constructs blade disc with preventing mud cake steel sheet which characterized in that: the steel plate is arranged on the shield cutter head, the shape and the position of the front cutter face of the cutter head on the cutter head are consistent with the shape and the position of the front cutter face of the cutter head on the cutter head, the steel plate is connected with the front cutter faces through bolts, the steel plate is made of molybdenum-vanadium alloy and Q235/Q245 in a modified mode, and the surface finish degree of the upper surface is less than 0.1.

2. A simulation experiment table for testing the characteristics of a steel plate is characterized in that: the device comprises a test bed frame, wherein the test bed frame comprises a lower storage supporting area and an upper equipment inclination angle area, hinge connection for connecting hinge structural components is arranged between the lower storage supporting area and the upper equipment inclination angle area, an experimental plate supporting table driven by a bidirectional motor is installed in the upper equipment inclination angle area, the experimental plate supporting table is installed on a door-shaped support and comprises a bottom rotating shaft and a clamping jaw installed on the bottom rotating shaft, and the clamping jaw clamps an experimental plate with the length of 40-60 cm and the width of 40-60 cm;

the rotating shaft is mounted at the top end of the door-shaped support through a bearing, the input end of the rotating shaft is connected with the output shaft of the bidirectional motor, the experimental plate corresponds to the steel plate in material, is correspondingly made of molybdenum-vanadium alloy or Q235/Q245 in a modified mode, the smoothness of the upper surface is less than 0.1, a stirring barrel, a sample box and a plurality of experimental plates to be tested are arranged in the lower storage supporting area, the sample box is in a hollow cylindrical barrel shape, and the inner diameter of the sample box is less than 8 cm.

3. The simulation bench for characteristic test of steel sheet as set forth in claim 1, wherein: the experimental plate to be tested is vertically clamped in the lower storage supporting area.

4. The simulation bench for characteristic test of steel sheet according to claim 1, wherein: lower part storage supporting area and upper portion equipment inclination district are equipped with angle support measuring mechanism, angle support measuring mechanism includes spout pole and locking bolt, the top of spout pole is installed via the pivot connection the bottom edge in upper portion equipment inclination district is provided with the spout on the spout pole, and the bottom frame in upper portion equipment inclination district is equipped with the horizontal groove, locking bolt wears to warp spout and horizontal groove are fixed on the upper portion edge in lower part storage supporting area, be equipped with the scale mark on the spout in order to guide the interval installation angle in lower part storage supporting area and upper portion equipment inclination.

5. The simulation bench for characteristic test of steel sheet as set forth in claim 1, wherein: the bidirectional motor is further connected with a control mechanism, and the control mechanism is provided with a display screen and a key to control the opening, the closing, the steering and the rotating speed of the bidirectional motor.

6. The simulation bench for characteristic test of steel sheet according to claim 4, wherein: the lower surface finish of the test plate is less than 0.16.

7. The simulation bench for characteristic test of steel sheet according to claim 5, wherein: the edge of the experimental plate is clamped with a tension meter positioning clamp, the head part of the tension meter is hung on the tension meter positioning clamp, the tail end of the tension meter positioning clamp is embedded in the sample box, and the tension meter positioning clamp comprises a [ shaped ] clamp body and a roller arranged at the edge of the experimental plate in a sliding manner in the clamp body.

8. The simulation bench for characteristic test of steel sheet according to claim 1, wherein: the surface area of the experiment board is divided into marking lines formed by mark strokes or marking lines projected by an optical mechanism, the optical mechanism comprises a transverse light column for emitting latticed optical lines and supporting columns on two sides of the transverse light column, and the supporting columns are clamped on the clamping jaws.

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