Mining electric support with linear motor driving push rod and buffering top beam

Abstract

The invention provides a mining electric support with a linear motor driving push rod and a buffer top beam. The mining electric support comprises a base, the buffer top beam, a shield beam, a lifting linear motor and an electric push rod. The base is fixedly connected with the lifting linear motor, so that the stability of the motor during operation is ensured, and displacement caused by vibration is avoided; compared with a traditional hydraulic support, the lifting linear motor drives the electric push rod to achieve lifting work of the top beam, the lower end of the electric push rod is fixedly connected with a lifting linear motor shaft, the upper end of the electric push rod is connected with the lower end of the buffering top beam, and the lifting linear motor drives the electric push rod to move and further drives the buffering top beam to ascend and descend. A plurality of composite shock absorbers are installed on the buffering top beam, buffering tops of the composite shock absorbers are of a rubber-steel composite layer structure, the buffering tops of the composite shock absorbers are in direct contact with a top plate to deform during beam lifting, and impact loads are absorbed. A hydraulic system is directly driven by the lifting linear motor, the energy absorption structure design is combined, the top beam buffering performance, the support response speed and flexibility are remarkably improved, meanwhile, the maintenance cost is reduced, and the safety of underground operation can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of mining supports, and in particular to a mining electric support with a linear motor driven push rod and a buffer top beam. Background Art

[0002] During the mining process, the pressure on the roof of the working face is severe, especially dynamic disasters such as rock burst, which seriously threaten the safety of mine production and the lives of miners. Although traditional hydraulic supports can support the roof to a certain extent, they have slow response speed and poor flexibility, making it difficult to effectively respond to emergencies such as rock burst. In addition, the hydraulic system has hidden dangers such as leakage and pollution, and the maintenance cost is high, which makes it difficult to meet the efficient, safe and environmentally friendly mining needs of modern mines.

[0003] At present, most of the research on mine supports focuses on the simple improvement of the support structure, lacks targeted design for dynamic disasters such as rock burst, and is difficult to meet the safety production needs of mines under complex geological conditions. Linear motor technology is developing rapidly. It has the advantages of fast response speed, high control accuracy, and simple structure, providing a new direction for the intelligent development of coal mine machinery. Applying linear motors to hydraulic supports can effectively improve the response speed and flexibility of the supports and enhance their ability to resist dynamic disasters such as rock burst. Therefore, the development of a linear motor-driven buffer electric support that can effectively reduce impact, improve response speed and flexibility has important engineering value for improving the intelligence level and intrinsic safety performance of mine support systems. Summary of the invention

[0004] In response to the above technical problems, the purpose of the present invention is to provide a new structure of a mining electric support with a linear motor-driven push rod and a buffer top beam, which uses a lifting linear motor to drive the top beam, thereby reducing the risk of pollution and improving the response speed. The buffer top beam is designed for energy absorption and buffering, thereby enhancing the impact resistance.

[0005] To achieve the above-mentioned purpose, the present invention provides a mining electric support with a linear motor-driven push rod and a buffer top beam, comprising a base, a buffer top beam, a shielding beam, a lifting linear motor and an electric push rod, and the lifting and lowering of the top beam are achieved by adopting a lifting linear motor to drive the lifting and lowering of the top beam. The lifting linear motor is fixedly connected to the base, the rear end of the base is hinged to the lower end of the connecting rod, the upper end of the connecting rod is hinged to the lower end of the shielding beam, the upper end of the shielding beam is hinged to the rear end of the buffer top beam, the upper end of the electric push rod is hinged to the lower end of the buffer top beam, and the lower end is fixedly connected to the lifting linear motor shaft. The base, connecting rod, shielding beam and buffer top beam constitute a four-bar linkage mechanism for constraining the lifting and lowering trajectory of the buffer top beam.

[0006] The lifting linear motor comprises a housing, a spring, a stator assembly and a mover assembly. The spring is fixedly connected to the inner wall of the bottom end of the housing, the stator assembly comprises an inner yoke, an outer yoke, a fixing frame, an inner coil and an outer coil, the outer yoke is coaxially sleeved on the outer side of the inner yoke, the inner yoke is installed on the central axis of the housing, the inner coil and the outer coil are respectively wound on the inner yoke and the outer yoke, the inner yoke and the outer yoke are fixedly installed by a fixing frame, and the fixing frame is fixedly connected to the inner wall of the housing of the lifting linear motor.

[0007] Preferably, three groups of stator assemblies are fixedly mounted in series on the central axis of the lifting linear motor housing.

[0008] Preferably, the mover assembly includes a lifting linear motor shaft, a rubber pad and a permanent magnet block. The lower end of the lifting linear motor shaft is connected to the rubber pad, and the upper end is fixedly connected to the lower end of the electric push rod. The permanent magnet block is embedded in the lifting linear motor shaft, and the rubber pad and the spring form an anti-collision device.

[0009] A plurality of grooves are evenly arranged on the upper end of the buffer top beam, and a plurality of composite shock absorbers are installed in the grooves.

[0010] The composite shock absorber includes a limit base and a buffer top, and the buffer top is a rubber-steel composite layer structure. The limit base is installed with four limit tubes, and the buffer top is installed with four guide rods. The limit base and the buffer top are connected with the limit tubes and guide rods. The rubber column is fixedly connected between the limit base and the buffer top, and a shock-absorbing spring is installed in the rubber column.

[0011] Advantages of the present invention: 1. Use linear motor drive rods to replace traditional hydraulic systems, eliminating the risk of hydraulic oil leakage and meeting the needs of green mine construction; 2. The linear motor drive has the characteristics of fast response and high precision control; 3. The buffer top beam integrates a composite shock-absorbing module, and the directional damping system composed of a limit tube and a guide rod effectively reduces the vertical impact kinetic energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following is a brief description of the drawings required for describing the embodiments; Figure 1 It is a schematic diagram of the overall structure of the electric support for mining with a linear motor driven push rod and a buffer top beam of the present invention; Figure 2 It is a front view of the internal integral structure of the lifting linear motor of the mining electric support with a linear motor driven push rod and a buffer top beam of the present invention; Figure 3It is a cross-sectional schematic diagram of a lifting linear motor of a mining electric support having a linear motor driven push rod and a buffer top beam according to the present invention; Figure 4 It is a structural schematic diagram of a composite buffer of a mining electric support having a linear motor driven push rod and a buffer top beam according to the present invention; Figure 5 The present invention is a cross-sectional schematic diagram of a composite buffer of a mining electric support having a linear motor driven push rod and a buffer top beam.

[0013] The following is a supplementary description of the attached drawings: Among them, 1. base; 2. buffer top beam; 3. shield beam; 4. lifting linear motor; 5. electric push rod; 6. connecting rod; 7. shell; 8. spring; 9. inner yoke; 10. outer yoke; 11. inner and outer yoke fixing frame; 12. inner coil; 13. outer coil; 14. lifting linear motor shaft; 15. rubber pad; 16. permanent magnet; 17. groove; 18. composite shock absorber; 19. limit base; 20. buffer top; 21. limit tube; 22. guide rod; 23. rubber column; 24. buffer spring. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0015] It should be noted that all directional indications (such as outside, inside, left, right, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0016] See also Figures 1 to 4 The electric support for mining with a linear motor driven push rod and a buffer top beam of the present invention is described in detail. The electric support for mining with a linear motor driven push rod and a buffer top beam of the present invention is suitable for mining supports.

[0017] The mining electric support with linear motor driven push rod and buffer top beam of the present invention comprises a base 1, a buffer top beam 2, a shielding beam 3, a lifting linear motor 4 and an electric push rod 5. The lifting linear motor 4 is used to drive the lifting of the buffer top beam 2. The lifting linear motor 4 is fixedly connected to the base 1 to ensure that the lifting linear motor 4 remains stable during operation and avoids displacement caused by vibration. The rear end of the base 1 is hinged to the lower end of the connecting rod 6, the upper end of the connecting rod 6 is hinged to the lower end of the shielding beam 3, the upper end of the shielding beam 3 is hinged to the rear end of the buffer top beam 2, the top end of the electric push rod 5 is hinged to the bottom end of the buffer top beam 2, and the lower end of the electric push rod 5 is fixedly connected to the upper end of the lifting linear motor shaft 14. The four-link hinge structure is used to adapt to dynamic changes in pressure and improve the adaptability of the support.

[0018] The electric support for mining with a linear motor driven push rod and a buffer top beam of the present invention, the lifting linear motor 4 is fixedly connected to the base 1, the lifting linear motor 4 includes a housing 7, a spring 8, a stator assembly and a mover assembly, the spring 8 is fixedly mounted on the inner wall of the bottom end of the lifting linear motor housing 7, the stator assembly includes an inner yoke 9, an outer yoke 10, a fixing frame 11, an inner coil 12 and an outer coil 13, the outer yoke 10 is coaxially sleeved on the outer side of the inner yoke 9, the inner yoke 9 is mounted on the central axis of the housing 7, and the combination design of the inner yoke 9 and the outer yoke 10 enhances the concentration of the magnetic field and improves the electromagnetic efficiency and thrust output of the motor. The inner coil 12 and the outer coil 13 are wound on the inner yoke 9 and the outer yoke 10, and the inner coil 12 and the outer coil 13 generate an alternating magnetic field after being energized, driving the permanent magnet 16 to move axially, thereby driving the lifting linear motor shaft 14 to move linearly, so that the electric push rod 5 is lifted and lowered along the central axis of the lifting linear motor, thereby driving the buffer top beam 2 to lift and lower. The inner yoke 9 and the outer yoke 10 are fixedly installed by a fixing frame 11. The fixing frame 11 reduces the vibration generated by the inner yoke 9 and the outer yoke 10 after being powered on. The fixing frame 11 is fixedly connected to the inner wall of the housing 7 of the lifting linear motor.

[0019] The mining electric support with a linear motor driven push rod and a buffer top beam of the present invention has three sets of stator assemblies connected in series and fixedly installed on the central axis of the housing 7 of the lifting linear motor. The design of multiple sets of stators connected in series can improve the electromagnetic thrust output and meet the requirements of high-load working conditions.

[0020] The electric support for mining with a linear motor driven push rod and a buffer top beam of the present invention, the mover assembly includes a lifting linear motor shaft 14, a rubber pad 15 and a permanent magnet block 16, the lower end of the lifting linear motor shaft 14 is connected to the rubber pad 15, the upper end of the lifting linear motor shaft 14 is fixedly connected to the lower end of the electric push rod 5, the rubber pad 15 and the spring 8 form an anti-collision device, the permanent magnet block 16 is embedded in the lifting linear motor shaft 14, the inner coil 12 and the outer coil 13 are energized when the beam is raised or lowered, and an alternating magnetic field is formed on the inner yoke 9 and the outer yoke 10, and the permanent magnet block 16 interacts with the stator magnetic field to generate an axial electromagnetic force, driving the lifting linear motor shaft 14 to move linearly along the central axis of the shell. The rubber pad 15 and the spring 4 provide axial elastic support, and when the top beam is lowered to the limit position, the rubber pad 15 is compressed to absorb energy first, and the spring 8 is deformed subsequently to form a two-stage buffer to prevent collision with the cylinder.

[0021] The mining electric support of the present invention has a linear motor driven push rod and a buffer top beam, and a plurality of grooves are evenly arranged on the upper end of the buffer top beam. A plurality of composite shock absorbers 18 are installed in the grooves 17. The composite shock absorbers 18 evenly distribute and disperse the impact load to avoid stress concentration and improve the impact resistance of the top beam.

[0022] The electric mining support of the present invention has a linear motor driven push rod and a buffer top beam, the composite shock absorber 18 includes a limit base 19 and a buffer top 20, and the buffer top 20 is a rubber-steel composite layer structure, the limit base 19 is installed with four limit tubes 21, the buffer top 20 is installed with four guide rods 22, the limit base 19 and the buffer top 20 are connected with the limit tube 21 and the guide rod 22, the rubber column 23 is fixedly connected between the limit base 19 and the buffer top 20, and a shock absorbing spring 24 is installed in the rubber column 23. The connection between the limit tube 21 and the guide rod 22 limits the movement range of the buffer top, prevents excessive displacement from causing structural damage, and improves the shock absorption stability.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mining electric support with a linear motor driven push rod and a buffer top beam, comprising a base (1), a buffer top beam (2), a shielding beam (3), a lifting linear motor (4) and an electric push rod (5), characterized in that: The lifting and lowering of the buffer top beam (2) is achieved by driving a lifting linear motor (4), wherein the lifting linear motor (4) is fixedly connected to a base (1); the rear end of the base (1) is hinged to the lower end of a connecting rod (6), the upper end of the connecting rod (6) is hinged to the lower end of a shielding beam (3), the upper end of the shielding beam (3) is hinged to the rear end of the buffer top beam (2), the upper end of the electric push rod (5) is hinged to the lower end of the buffer top beam (2), and the lower end of the electric push rod (5) is fixedly connected to a lifting linear motor shaft (14); the base (1), the connecting rod (6), the shielding beam (3) and the buffer top beam (2) form a four-bar linkage mechanism for constraining the lifting and lowering trajectory of the buffer top beam (2).

2. The electric support for mining with a linear motor driven push rod and a buffer top beam according to claim 1, characterized in that: The lifting linear motor (4) comprises a housing (7), a spring (8), a stator assembly and a mover assembly. The spring (8) is fixedly connected to the inner wall of the bottom end of the housing (7). The stator assembly comprises an inner yoke (9), an outer yoke (10), a fixing frame (11), an inner coil (12) and an outer coil (13). The outer yoke (10) is coaxially sleeved on the outer side of the inner yoke (9). The inner yoke (9) is installed on the central axis of the housing (7). The inner coil (12) and the outer coil (13) are respectively wound on the inner yoke (9) and the outer yoke (10). The inner yoke (9) and the outer yoke (10) are fixedly installed by a fixing frame (11). The fixing frame (11) is fixedly connected to the inner wall of the housing (7) of the lifting linear motor.

3. The electric support for mining with a linear motor driven push rod and a buffer top beam according to claim 2, characterized in that: The three groups of stator assemblies are fixedly mounted in series on the central axis of the housing (7) of the lifting linear motor.

4. The electric support for mining with a linear motor driven push rod and a buffer top beam according to claim 2, characterized in that: The mover assembly comprises a lifting linear motor shaft (14), a rubber pad (15) and a permanent magnet block (16); the lower end of the lifting linear motor shaft (14) is fixedly connected to the rubber pad (15), and the upper end is fixedly connected to the lower end of the electric push rod (5); the permanent magnet block (16) is embedded in the lifting linear motor shaft (14); and the rubber pad (15) and the spring (8) form an anti-collision device.

5. The electric support for mining with a linear motor driven push rod and a buffer top beam according to claim 1, characterized in that: A plurality of grooves (17) are evenly arranged on the upper end of the buffer top beam (2), and a plurality of composite shock absorbers (18) are installed in the grooves (17).

6. The mining electric support with a linear motor driven push rod and a buffer top beam according to claim 5, characterized in that: The composite shock absorber comprises a limit base (19) and a buffer top (20), wherein the buffer top (20) is a rubber-steel composite layer structure, the limit base (19) is installed with four limit tubes (21), the buffer top (20) is installed with four guide rods (22), the limit base (19) and the buffer top (20) are connected via the limit tubes (21) and the guide rods (22), the rubber column (23) is fixedly connected between the limit base and the buffer top, and a shock absorbing spring (24) is installed in the rubber column.

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