A simulation system for the dynamic process of ultra-high-speed landslide based on electromagnetic linear propulsion acceleration

Abstract

The present invention discloses a super-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration, including an electromagnetic acceleration slide rail, a material discharging platform, a lifting platform, a material box, a beam photoelectric sensor, a connecting frame, a permanent magnet and a slide; two electromagnetic acceleration slide rails are placed side by side with a gap in the middle, and the permanent magnet is located in the gap; the connecting frame is vertically fixed at the entrance of the material discharging platform; a slide groove is provided in the material discharging platform; the beam photoelectric sensor is arranged on the connecting frame; the upper surface of the permanent magnet is fixedly connected to the slide, and the lower surface is fixedly connected to the material box; the slide is slidably arranged on the upper surface of the electromagnetic acceleration slide rail; the material box is provided with a material box door; and the beam photoelectric sensor is connected to the material box for communication. The present invention realizes the full dynamic process simulation of high-speed long-distance landslide. The extremely high speed that can be achieved in the real landslide process is simulated under indoor conditions through electromagnetic acceleration. The automatic opening and closing design of the material box ensures the accurate delivery and rapid collection of experimental materials.

Description

Technical Field

[0001] The invention relates to the field of landslide physical model tests, in particular to an ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration. Background Art

[0002] High-speed long-distance landslides are high-speed rock debris flows developed from large-scale rock collapses or rock slides. They are characterized by fast movement speed, strong impact and destructive ability, and a large disaster range. This type of geological disaster poses a serious threat to the safety of life and property of people in high mountainous and canyon areas and the construction and safe operation of transportation trunk lines. Therefore, it has always been a frontier and hot issue in research. Among them, the dynamic mechanism and disaster prevention and mitigation theory are one of the key difficulties and scientific issues in the prevention and control of high-speed long-distance landslides and their disaster chains.

[0003] There are three main research methods for high-speed long-distance landslides: field surveys, numerical simulations, and physical model simulation tests. Although field surveys are highly accurate, field tests are dangerous, time-consuming, and extremely limited because landslides are located in remote mountainous areas and are sudden and destructive. In numerical simulations, establishing mathematical models saves time and effort, but it requires simplifying many conditions, resulting in low accuracy and large errors. Physical model simulation tests are widely used in geological engineering, geotechnical engineering, mining engineering, and other fields, and are an important means of solving large and complex engineering projects. Domestic and foreign researchers mainly simulate the entire process of high-speed long-distance landslides by establishing physical models, so as to better reveal the formation mechanism and migration mechanism and achieve quantitative prediction.

[0004] The disadvantages of the existing technology are: 1. At present, it is difficult to exceed the sliding speed of 20m / s in small-scale in-situ tests, large-scale flume tests, conventional scaled gravity model tests, supergravity geotechnical centrifuge tests and pneumatic acceleration sliding body simulation tests. 2. The movement speed of the landslide simulated by the existing indoor physical model simulation test is generally less than 5m / s, and the outdoor large-scale can reach more than 10m / s, but the ultra-high speed simulation is still limited, and it is difficult to restore the movement speed of the real field high-speed long-distance landslide, which seriously affects the authenticity and reliability of the landslide simulation test results. 3. Ultra-gravity centrifuge simulation can achieve high-speed simulation (20m / s landslide debris flow can be simulated under 30g) because it can restore the prototype stress field; theoretically, ultra-high speed can be achieved by increasing the centrifugal force, but it will inevitably be accompanied by a significant Coriolis effect problem, which has not yet been solved. 4. Although the pneumatic acceleration simulation device has initially shown certain advantages, the acceleration distance is limited and the indirect air pressure push process is not easy to control, and larger-scale and higher-speed simulations are still difficult.

[0005] Electromagnetic acceleration technology is one of the most promising technologies at present. It mainly relies on the magnetic field induced by the current-carrying conductor to accelerate the target object. This technology can be applied to many fields, such as high-energy physics experiments and materials science research. Electromagnetic acceleration can also play an important role in indoor physical model simulation landslide tests. However, its practical application also has certain challenges and limitations. Electromagnetic acceleration needs to provide a stable and strong magnetic field throughout the entire length of the landslide, which has certain requirements for equipment design and practical implementation. At the same time, electromagnetic acceleration technology requires precise control and measurement in an indoor environment, which places very high demands on the equipment. In addition, indoor physical model tests need to simulate complex physical processes in actual scenes, and electromagnetic acceleration technology needs to achieve acceleration in a limited space, which requires precise control of the direction, speed and time of acceleration. Finally, in the simulated landslide acceleration test, the behavior of the material after acceleration, such as the shape, size and mass of the object, needs to be considered, which may affect the acceleration results. Summary of the invention

[0006] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a super-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration.

[0007] The technical solution of the present invention to solve the technical problem is to provide an ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration, characterized in that the system includes an electromagnetic acceleration slide rail, a material unloading platform, a lifting platform, a material box, a photoelectric sensor, a connecting frame, a permanent magnet and a sliding plate;

[0008] Two electromagnetic acceleration slides are placed side by side, located on the same horizontal plane, and there is a gap in the middle; one end of the two electromagnetic acceleration slides is installed on the lifting platform, and the other end is rotatably installed on the connecting frame; the inclination angle of the two electromagnetic acceleration slides is changed by adjusting the lifting platform; the connecting frame is vertically fixed at the entrance of the discharge platform; a slide groove is opened in the discharge platform to accommodate the released materials and play a role in buffering and deceleration; the through-beam photoelectric sensor is arranged on the connecting frame and located at the entrance of the discharge platform; the upper surface of the permanent magnet is fixedly connected to the slide through a connecting rod, and the lower surface is fixedly connected to the material box through a connecting rod; the permanent magnet is located in the gap between the two electromagnetic acceleration slides; the slide is slidably arranged on the upper surface of the two electromagnetic acceleration slides; the material box is provided with a material box door for releasing objects; the electromagnetic acceleration slide, the material box and the through-beam photoelectric sensor are all electrically connected to an external AC power supply; the through-beam photoelectric sensor is communicatively connected to the material box.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] (1) The present invention achieves full dynamic process simulation of high-speed long-distance landslide. The electromagnetic acceleration technology is successfully applied to the field of indoor ultra-high-speed landslide simulation. Through electromagnetic acceleration, the extremely high speed that can be achieved in the real landslide process can be simulated under indoor conditions, solving the speed limitation problem of high-speed landslide in the existing indoor physical model simulation test technology. The automatic opening and closing design of the material box ensures the accurate delivery and rapid collection of experimental materials, thereby avoiding the errors that may be caused by human operation and improving the consistency and accuracy of the simulation test.

[0011] (2) The electromagnetic acceleration slide rail of the present invention accelerates the permanent magnet through the action of electromagnetics, so that the material reaches a very high speed in a very short time; at the same time, the material box is automatically opened and closed quickly through the push-pull electromagnetic rod, and the material is released quickly and timely to simulate the material release situation in the actual landslide sliding process, meeting the characteristics of high-speed landslide movement that occurs instantly and develops rapidly, thereby providing more accurate and effective experimental data for studying landslide mechanisms and prevention and control measures.

[0012] (3) The present invention realizes the landslide acceleration process of high-speed long-distance landslides at different angles and heights by adjusting the height of the lifting platform, thereby simulating the landslide behavior under various complex environments, providing higher control accuracy and stability, and facilitating the realization of larger-scale and higher-speed simulations.

[0013] (4) The present invention has high repeatability and reliability, and can carry out multiple tests to ensure the accuracy and consistency of the test results. It not only avoids the problem of the Coriolis effect, but also overcomes the limitations of acceleration distance and control difficulty.

[0014] (5) The present invention is not only suitable for the study of high-speed long-distance landslides, but can also be used to simulate high-speed landslide events such as mountain collapse and meteorite impact, providing important data support for the development of related monitoring and early warning technologies and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a cross-sectional schematic diagram of the overall structure of the present invention from a left-side viewing angle;

[0017] Figure 3 It is a three-dimensional schematic diagram of two electromagnetic acceleration slide rails of the present invention;

[0018] Figure 4 It is a three-dimensional schematic diagram of a single electromagnetic acceleration slide rail of the present invention;

[0019] Figure 5 For the present invention Figure 1 A partial enlarged view of area A;

[0020] Figure 6 It is a cross-sectional view of the material box of the present invention when it is powered on;

[0021] Figure 7 It is a cross-sectional view of the material box of the present invention when the power is off;

[0022] Figure 8 This is a diagram of the internal structure of the push-pull type electromagnetic rod of the present invention when it is energized;

[0023] Fig. 9 This is a diagram of the internal structure of the push-pull type electromagnetic rod of the present invention when the power is off;

[0024] Fig.10 The figure is a schematic diagram of the installation of the through-beam photoelectric sensor of the present invention and its electrical connection with the material box.

[0025] In the figure, a loading platform 1, an electromagnetic acceleration slide rail 2, a discharging platform 3, a lifting platform 4, a material box 5, a rotating shaft 6, a photoelectric sensor 7, a connecting frame 8, a permanent magnet 9, a slide 10, and a relay 11;

[0026] Slide rail housing 201, iron core 202, coil winding 203; slide slot 301;

[0027] Material box housing 501, magnet 502, spring 503, enameled wire 504, push rod 505, insulating housing 506, lead wire 507, electrical connector 508, material box door 509;

[0028] Receiver 701, transmitter 702. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are given below. The specific embodiments are only used to further illustrate the present invention in detail and do not limit the protection scope of the present invention.

[0030] The present invention provides a super-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration (hereinafter referred to as the system), characterized in that the system comprises an electromagnetic acceleration slide rail 2, a material discharge platform 3, a lifting platform 4, a material box 5, a photoelectric sensor 7, a connecting frame 8, a permanent magnet 9 and a sliding piece 10;

[0031] Two electromagnetic acceleration slides 2 are placed side by side, located on the same horizontal plane, with a gap in the middle; one end of the two electromagnetic acceleration slides 2 is installed on the lifting platform 4, and the other end is rotatably installed on the connecting frame 8 through the rotating shaft 6; the inclination angle of the two electromagnetic acceleration slides 2 is changed by adjusting the lifting platform 4 to simulate the sliding acceleration process of high-speed long-distance landslides with different slopes; the connecting frame 8 is vertically fixed at the entrance of the discharge platform 3; a slide groove 301 is opened in the discharge platform 3 to accommodate the released materials and play a role in buffering and deceleration, simulating the landslide destruction process of high-speed long-distance landslides; a photoelectric sensor is used to 7 is arranged on the connecting frame 8 and is located at the entrance of the unloading platform 3; the upper surface of the permanent magnet 9 is fixedly connected to the slide 10 through a connecting rod, and the lower surface is fixedly connected to the material box 5 through a connecting rod; the permanent magnet 9 is located in the gap between the two electromagnetic acceleration slides 2, so as to facilitate the movement of the material box 5 between the two electromagnetic acceleration slides 2; the slide 10 is slidably arranged on the upper surfaces of the two electromagnetic acceleration slides 2; the material box 5 is provided with a material box door 509 for releasing objects; the electromagnetic acceleration slide 2, the material box 5 and the opposing photoelectric sensor 7 are all electrically connected to the external AC power supply; the opposing photoelectric sensor 7 is in communication connection with the material box 5.

[0032] Preferably, the system further comprises a loading platform 1 ; materials are stored in the loading platform 1 , and the materials are loaded into the material box 5 from the loading platform 1 .

[0033] Preferably, the system further comprises a power converter; the external AC power source is electrically connected to the electromagnetic acceleration slide rail 2, the material box 5 and the opposing photoelectric sensor 7 respectively through the power converter.

[0034] Preferably, each electromagnetic acceleration slide rail 2 is composed of a slide rail housing 201, an iron core 202 and a coil winding 203;

[0035] One end of the slide rail housing 201 is installed on the lifting platform 4, and the other end is rotatably installed on the connecting frame 8 through the rotating shaft 6; a plurality of (22 in this embodiment) iron cores 202 are fixed in the slide rail housing 201 at intervals; a plurality of (10 in this embodiment) coil windings 203 are wound on the iron cores 202 in an interlaced and overlapping manner along the same winding direction; an external AC power supply is electrically connected to the coil windings 203 to supply power to the coil windings 203; the iron cores 202 of the two electromagnetic acceleration slide rails 2 are arranged side by side and opposite to each other, and there is a gap between the iron cores 202 of the two electromagnetic acceleration slide rails 2.

[0036] Preferably, the material box 5 comprises a material box housing 501, a push-pull type electromagnetic rod and a material box door 509;

[0037] The material box shell 501 is fixed to the lower surface of the permanent magnet 9 through a connecting rod; the bottom surface of the material box shell 501 is open; one end of the material box door 509 is hinged to the bottom surface of the material box shell 501; the two ends of the push-pull electromagnetic rod are respectively hinged to the material box shell 501 and the material box door 509 to realize the switching of the material box shell 501; the external AC power supply is electrically connected to the push-pull electromagnetic rod.

[0038] Preferably, two material box doors 509 are provided at the bottom opening of the material box shell 501; one end of the two material box doors 509 are respectively hinged to the two side walls of the bottom surface of the material box shell 501; one end of the two push-pull electromagnetic rods are respectively hinged to their own material box doors 509, and the other ends are respectively hinged to the two side walls of the material box shell 501, so as to realize the opening and closing of the material box shell 501.

[0039] Preferably, the push-pull type electromagnetic rod comprises a magnet 502, a spring 503, an enameled wire 504, a push rod 505 and an insulating shell 506;

[0040] A space is opened inside the insulating shell 506, and the magnet 502 is fixed in the internal space of the insulating shell 506; the enameled wire 504 is wound on the push rod 505; an axial through hole is opened inside the magnet 502, and the push rod 505 wound with the enameled wire 504 is slidably set in the internal through hole of the magnet 502; the external AC power supply is electrically connected to the enameled wire 504; the magnetic field generated by the enameled wire 504 being energized is opposite to the magnetic field of the magnet 502; the spring 503 is arranged inside the insulating shell 506, one end of which is fixedly connected to the inner wall of the insulating shell 506, and the other end is fixedly connected to one end of the push rod 505; the other end of the push rod 505 is located outside one end of the insulating shell 506, and is hinged to one of the material box door 509 and the material box shell 501; the other end of the insulating shell 506 is hinged to the other of the material box door 509 and the material box shell 501.

[0041] Preferably, the push-pull electromagnetic rod also includes a lead wire 507 and an electrical connector 508 ; the negative pole of the external AC power supply is electrically connected to one port of the electrical connector 508 ; and the enameled wire 504 is electrically connected to the other port of the electrical connector 508 through the lead wire 507 .

[0042] Preferably, the system further includes a relay 11; the through-beam photoelectric sensor 7 is connected to the material box 5 through the relay 11; the relay 11 is electrically connected to the external AC power supply. The function of the relay 11 is to convert the weak signal output by the through-beam photoelectric sensor 7 into a strong signal capable of driving the push-pull electromagnetic rod of the material box 5, so as to realize remote control and automatic control of the on and off of the push-pull electromagnetic rod.

[0043] Preferably, the beam photoelectric sensor 7 includes a receiver 701 and a transmitter 702; the transmitter 702 and the receiver 701 are respectively arranged on both sides of the connecting frame 8, and the transmitter 702 and the receiver 701 are directly opposite, and the distance between the transmitter 702 and the receiver 701 is greater than the width of the material box 5;

[0044] The positive poles of the receiver 701 and the transmitter 702 are electrically connected to the positive pole of the external AC power supply, and the negative poles are electrically connected to the negative pole of the external AC power supply. The output end of the receiver 701 is electrically connected to one end of the relay 11; the normally open contact end (NO) of the relay 11 is electrically connected to a port of the electrical connector 508 of the push-pull electromagnetic rod of the material box 5.

[0045] The working principle and workflow of the present invention are:

[0046] When in use, firstly, the material is loaded from the loading platform 1 into the material box 5, and the external AC power supply supplies power to the coil winding 203; when the coil winding 203 is supplied with AC, an alternating magnetic field is generated, so that the permanent magnet 9 becomes a conductor with induced current, and the permanent magnet 9 is acted upon by the Ampere force in the alternating magnetic field, driving the material box 5 to move forward along the two electromagnetic acceleration slide rails 2; by adjusting the current intensity of the AC, the magnitude of the electromagnetic force generated is controlled, and then the magnitude of the acceleration generated is adjusted, so as to control the speed of the sliding acceleration process of the high-speed long-distance landslide;

[0047] When the permanent magnet 9 drives the material box 5 to pass through the electromagnetic acceleration slide rail 2 and arrive at the connecting frame 8, the photoelectric sensor 7 is blocked by the material box 5, the light beam emitted by the transmitter 702 is blocked, and the light signal received by the receiver 701 is weakened or completely disappears. The receiver 701 converts the received light signal into an electrical signal output (preferably, when the output electrical signal is a weak signal, it is converted into a strong signal through the relay 11), the enameled wire 504 of the push-pull electromagnetic rod is controlled to be de-energized, the spring 503 pops out, and the push rod 505 pushes the material box door 509 to open, and the material is quickly released at the chute 301 of the discharge platform 3, simulating the landslide destruction process of the high-speed long-distance landslide, thereby realizing the simulation of the whole process of the high-speed long-distance landslide;

[0048] After the material is released, the enameled wire 504 of the push-pull electromagnetic rod is energized to generate a magnetic field, which is opposite to the magnetic field of the magnet 502, thereby generating a gravitational force, driving the push rod 505 to retract, the spring 503 to be compressed, and the material box door 509 to close.

[0049] The height of the lifting platform 4 is adjusted, the inclination angle of the electromagnetic acceleration slide rail 2 is changed, and the slope of the landslide simulation is changed to simulate high-speed long-distance landslide processes with different slopes.

[0050] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A super-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration, characterized by: The system comprises an electromagnetic acceleration slide rail (2), a material unloading platform (3), a lifting platform (4), a material box (5), a photoelectric sensor (7), a connecting frame (8), a permanent magnet (9) and a slide (10); Two electromagnetic acceleration slide rails (2) are placed side by side, located on the same horizontal plane, and there is a gap in between; one end of the two electromagnetic acceleration slide rails (2) is installed on the lifting platform (4), and the other end is rotatably installed on the connecting frame (8); the inclination angle of the two electromagnetic acceleration slide rails (2) is changed by adjusting the lifting platform (4); the connecting frame (8) is vertically fixed at the entrance of the discharge platform (3); a slide groove (301) is opened in the discharge platform (3) for accommodating the released material and playing a role of buffering and deceleration; a photoelectric sensor (7) is arranged on the connecting frame (8) and is located on the discharge platform (3); the upper surface of the permanent magnet (9) is fixedly connected to the slide (10) through a connecting rod, and the lower surface is fixedly connected to the material box (5) through a connecting rod; the permanent magnet (9) is located in the gap between the two electromagnetic acceleration slide rails (2); the slide (10) is slidably arranged on the upper surfaces of the two electromagnetic acceleration slide rails (2); the material box (5) is provided with a material box door (509) for releasing the object; the electromagnetic acceleration slide rail (2), the material box (5) and the corresponding photoelectric sensor (7) are all electrically connected to an external AC power supply; the corresponding photoelectric sensor (7) is communicatively connected to the material box (5); The material box (5) comprises a material box housing (501), a push-pull type electromagnetic rod and a material box door (509); The material box housing (501) is fixed to the lower surface of the permanent magnet (9) via a connecting rod; the bottom surface of the material box housing (501) is open; one end of the material box door (509) is hinged to the bottom surface of the material box housing (501); the two ends of the push-pull type electromagnetic rod are respectively hinged to the material box housing (501) and the material box door (509) to realize the opening and closing of the material box housing (501); and the external AC power supply is electrically connected to the push-pull type electromagnetic rod; The push-pull type electromagnetic rod comprises a magnet (502), a spring (503), an enameled wire (504), a push rod (505) and an insulating shell (506); A space is provided inside the insulating shell (506), and the magnet (502) is fixed in the internal space of the insulating shell (506); the enameled wire (504) is wound around the push rod (505); an axial through hole is provided inside the magnet (502), and the push rod (505) wound with the enameled wire (504) is slidably arranged in the internal through hole of the magnet (502); an external AC power source is electrically connected to the enameled wire (504); a magnetic field generated by the enameled wire (504) being energized is parallel to the magnetic field of the magnet (502). The spring (503) is arranged inside the insulating shell (506), one end of which is fixedly connected to the inner wall of the insulating shell (506), and the other end of which is fixedly connected to one end of the push rod (505); the other end of the push rod (505) is located outside one end of the insulating shell (506) and is hinged to one of the material box door (509) and the material box shell (501); the other end of the insulating shell (506) is hinged to the other of the material box door (509) and the material box shell (501).

2. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 1 is characterized in that: The system also includes a loading platform (1); materials are stored in the loading platform (1), and the materials are loaded into the material box (5) from the loading platform (1).

3. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 1 is characterized in that: The system also includes a power converter; the external AC power source is electrically connected to the electromagnetic acceleration slide rail (2), the material box (5) and the corresponding photoelectric sensor (7) respectively through the power converter.

4. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 1 is characterized in that: Each electromagnetic acceleration slide rail (2) is composed of a slide rail housing (201), an iron core (202) and a coil winding (203); One end of the slide rail housing (201) is mounted on the lifting platform (4), and the other end is rotatably mounted on the connecting frame (8) via a rotating shaft (6); a plurality of iron cores (202) are fixed in the slide rail housing (201) at intervals; a plurality of coil windings (203) are wound on the iron cores (202) in an interlaced and overlapping manner along the same winding direction; an external AC power source is electrically connected to the coil windings (203) to supply power to the coil windings (203); the iron cores (202) of the two electromagnetic acceleration slide rails (2) are arranged side by side and face each other, and a gap exists between the iron cores (202) of the two electromagnetic acceleration slide rails (2).

5. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 1 is characterized in that: Two material box doors (509) are provided at the bottom opening of the material box housing (501); one end of the two material box doors (509) is respectively hinged to the two side walls of the bottom surface of the material box housing (501); one end of two push-pull type electromagnetic rods is respectively hinged to their respective material box doors (509), and the other end is respectively hinged to the two side walls of the material box housing (501), so as to realize the opening and closing of the material box housing (501).

6. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 1 is characterized in that: The push-pull type electromagnetic rod also includes a lead wire (507) and an electrical connector (508); the negative pole of the external AC power source is electrically connected to one port of the electrical connector (508); and the enameled wire (504) is electrically connected to the other port of the electrical connector (508) via the lead wire (507).

7. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 1 is characterized in that: The system also includes a relay (11); the opposing photoelectric sensor (7) is communicatively connected to the material box (5) via the relay (11); and the relay (11) is electrically connected to an external AC power source.

8. The ultra-high-speed landslide dynamic process simulation system based on electromagnetic linear propulsion acceleration according to claim 7 is characterized in that: The opposing photoelectric sensor (7) comprises a receiver (701) and a transmitter (702); the transmitter (702) and the receiver (701) are respectively arranged on two sides of the connecting frame (8), and the transmitter (702) and the receiver (701) are directly opposite to each other; The positive electrodes of the receiver (701) and the transmitter (702) are electrically connected to the positive electrode of an external AC power source, and the negative electrodes are electrically connected to the negative electrode of the external AC power source. The output end of the receiver (701) is electrically connected to one end of a relay (11); and the normally open contact end of the relay (11) is electrically connected to a port of an electrical connector (508) of a push-pull type electromagnetic rod of the material box (5).

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