Coal mining machine guide shoe and coal mining machine

Abstract

The present invention discloses a guide shoe for a coal mining machine and a coal mining machine. The guide shoe for the coal mining machine comprises a guide shoe body, a wear-resistant plate, a permanent magnet and a strain component; the guide shoe body comprises a mounting portion connected to the coal mining machine body and a limiting portion arranged opposite to the mounting portion, and a wear-resistant plate is arranged on the side of the limiting portion facing the mounting portion; the permanent magnet is arranged in the wear-resistant plate, a mounting groove is arranged on the guide shoe body near the permanent magnet, and the strain component is arranged in the mounting groove, the strain component is deformed by the magnetic attraction of the permanent magnet, and the deformation of the strain component changes with the change of the magnetic attraction, so as to convert the change of the magnetic attraction of the permanent magnet into an electrical signal output. The present invention can monitor the wear amount of the guide shoe in real time and can ensure a high monitoring accuracy.

Description

Technical Field

[0001] The invention relates to the field of mining equipment, and in particular to a guide shoe of a coal mining machine and a coal mining machine. Background Art

[0002] Coal mining machine is the core equipment of coal mining, and its main function is to break and load coal. Coal mining machine comprises guide sliding shoe, and the guide sliding shoe has guide groove, and the wear-resistant layer is fixed on the surface of the guide groove. When installing the coal mining machine, the guide groove of the guide shoe is mounted on the pin row of the conveyor, so that the guide shoe supports part of the weight of the coal mining machine, and the coal mining machine uses the pin row of the conveyor as a track. When the coal mining machine is working, the coal mining machine reciprocates on the pin row of the conveyor, which makes it inevitable that the surface of the wear-resistant layer in the guide groove and the surface of the pin row will wear. When the wear of the wear-resistant layer in the guide groove reaches a certain level, the wear-resistant layer should be repaired or the guide shoe should be replaced, otherwise it will cause improper meshing of the walking gear teeth and damage to other parts. In addition, due to excessive wear of the wear-resistant layer, the distance between the guide groove and the pin row of the conveyor increases, which can make the guide shoe easily fall off from the pin row and cause derailment. Therefore, when the wear of the wear-resistant layer reaches a certain level in production, the wear-resistant layer should be replaced in time. This requires regular measurement of the wear-resistant layer in order to detect and replace the wear-resistant layer in time.

[0003] At present, real-time monitoring of the guide shoe of coal mining machines has always been an industry problem. Due to its special usage scenario, the guide groove is filled with coal blocks and pins are arranged inside. Traditional proximity sensors and laser sensors cannot be used. The wear of the shoe can only be measured indirectly, which has the problem of inaccurate measurement. Summary of the invention

[0004] In view of this, the present invention provides a guide shoe of a coal mining machine and a coal mining machine, which can monitor the wear amount of the guide shoe in real time and can ensure high monitoring accuracy.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, an embodiment of the present invention provides a guide shoe for a coal mining machine, comprising a guide shoe body, a wear-resistant plate, a permanent magnet and a strain member;

[0007] The guide shoe body comprises a mounting portion connected to the coal mining machine body and a limiting portion arranged opposite to the mounting portion, and a wear-resistant plate is arranged on one side of the limiting portion facing the mounting portion;

[0008] The permanent magnet is arranged in the wear-resistant plate, and an installation groove is arranged on the guide shoe body near the permanent magnet. The strain component is arranged in the installation groove. The strain component is deformed by the magnetic attraction of the permanent magnet, and the deformation amount of the strain component changes with the change of the magnetic attraction, so as to convert the change of the magnetic attraction of the permanent magnet into an electrical signal output.

[0009] Optionally, the strain component includes an elastomer, a deformation measuring unit and a magnetic component, the elastomer includes a first section and a second section, the second section is connected to the guide shoe body, the magnetic component is connected to a position on the first section corresponding to the permanent magnet, and the deformation measuring unit is arranged on the elastomer.

[0010] Optionally, the deformation measurement unit includes a plurality of strain gauges and a printed circuit board, the plurality of strain gauges are arranged on the first section near the magnetic attraction component, the printed circuit board is arranged on the second section, and the plurality of strain gauges are connected to the printed circuit board to form a full-bridge circuit.

[0011] Optionally, a signal transmitter is further included, wherein the signal transmitter is arranged in the guide shoe body and connected to the full-bridge circuit.

[0012] Optionally, the mounting groove includes a first groove section and a second groove section, the first groove section includes a first bottom surface, the second groove section includes a second bottom surface, the first section is located in the first groove section, and there is a gap between the first section and the first bottom surface, the second section is located in the second groove section, and the second section is connected to the second bottom surface.

[0013] Optionally, the coal mining machine guide shoe further includes a mounting hole for mounting the permanent magnet, wherein the mounting hole penetrates the wear-resistant plate and extends in the guide shoe body to communicate with the first slot section.

[0014] Optionally, a magnetic isolation sleeve is provided between the inner wall of the mounting hole and the permanent magnet.

[0015] Optionally, the coal mining machine guide shoe also includes an upper cover plate, a groove is provided on the guide shoe body, the signal transmitter is installed in the groove, the groove has an opening open toward the top of the guide shoe body, and the upper cover plate covers the opening.

[0016] Optionally, the coal mining machine guide shoe further includes a lower cover plate, the mounting groove has an opening open toward the bottom of the guide shoe body, and the lower cover plate covers the opening.

[0017] In a second aspect, an embodiment of the present invention provides a coal mining machine, comprising the coal mining machine guide shoe as described above.

[0018] The beneficial effects of the technical solution provided by the embodiment of the present invention include at least:

[0019] The coal mining machine guide shoe provided by the present invention is provided with a permanent magnet flush with the wear-resistant plate and a strain component corresponding to the permanent magnet on the guide shoe body, so that the strain component is deformed by the magnetic attraction of the permanent magnet, and the deformation of the strain component changes with the change of the magnetic attraction. When the wear-resistant plate is worn, the permanent magnet will also be worn, the magnetism will be weakened, and the magnetic field strength will be reduced, thereby causing the strain change of the strain component, and the wear degree of the guide shoe can be dynamically detected, and maintenance prompts and warnings can be provided to the user in time to avoid economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a front view of a guide shoe of a coal mining machine according to an embodiment of the present invention.

[0022] Figure 2 For along Figure 1 Cross-sectional view taken along line AA.

[0023] Figure 3 for Figure 2 A partial enlarged view of part B.

[0024] Figure 4 for Figure 2 A partial enlarged view of part C.

[0025] Figure 5 FIG. 4 is a schematic structural diagram of a strain component according to an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of a full-bridge circuit according to an embodiment of the present invention.

[0027] Figure 7 FIG. 4 is a working principle diagram of a strain component according to an embodiment of the present invention.

[0028] The reference numerals in the figures represent respectively:

[0029] 100-guide shoe body; 110-first horizontal part; 120-second horizontal part; 130-first vertical part; 140-second vertical part; 111-first horizontal guide surface; 131-first vertical guide surface; 141-second vertical guide surface; 151-first slot section; 152-second slot section; 200-permanent magnet; 300-strain member; 310-elastomer; 311-first section; 312-second section; 320-magnetic attraction; 330-strain gauge; 340-printed circuit board; 400-signal transmitter; 500-lower cover; 600-upper cover; 700-magnetic isolation sleeve; 800-wear-resistant plate.

[0030] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] 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 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 are within the scope of protection of the present invention.

[0032] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 4 As shown, an embodiment of the present invention provides a guide shoe for a coal mining machine, comprising a guide shoe body 100 , a wear-resistant plate 800 , a permanent magnet 200 and a strain member 300 .

[0034] The guide shoe body 100 comprises a mounting portion connected to the coal mining machine body and a limiting portion arranged opposite to the mounting portion, and a wear-resistant plate is arranged on one side of the limiting portion facing the mounting portion.

[0035] The guide shoe body 100 may include a first horizontal portion 110, a second horizontal portion 120, a first vertical portion 130, and a second vertical portion 140. Here, the first horizontal portion 110 is a limiting portion. The first horizontal portion 110 is located below the second horizontal portion 120. The first horizontal portion 110 is shorter than the second horizontal portion 120. The first vertical portion 130 is disposed between the first horizontal portion 110 and the second horizontal portion 120 and is located at the ends of the first horizontal portion 110 and the second horizontal portion 120. The second vertical portion 140 is opposite to the first vertical portion 130 and is disposed at the other end of the second horizontal portion 120. The first horizontal guide surface 111 is the upper surface of the first horizontal portion 110. The space enclosed by the first horizontal portion 110, the second horizontal portion 120, the first vertical portion 130, and the second vertical portion 140 is a guide groove, which is sleeved on the pin row of the conveyor.

[0036] After careful analysis of the actual wear of the guide shoe, it is found that the derailment of the coal mining machine depends on the wear degree of the first horizontal portion 110 of the guide shoe. Therefore, in order to monitor the wear degree at the first horizontal portion 110, the permanent magnet 200 is arranged in the wear-resistant plate 800 on the first horizontal guide surface 111. Exemplarily, the top surface of the permanent magnet 200 is flush with the top surface of the wear-resistant plate 800.

[0037] Here, since the permanent magnet 200 is flush with the wear-resistant plate 800, the permanent magnet 200 and the wear-resistant plate 800 rub against the pin row at the same time. When the wear-resistant plate 800 is worn, the permanent magnet 200 will also be worn, the magnetism will be weakened, and the magnetic field strength will be reduced. An installation groove is provided on the guide shoe body 100 near the permanent magnet 200, and the strain member 300 is provided in the installation groove. The strain member 300 is deformed by the magnetic attraction of the permanent magnet 200, and the deformation of the strain member 300 changes with the change of the magnetic attraction, so as to convert the change of the magnetic attraction of the permanent magnet 200 into an electrical signal output.

[0038] The magnetic force of the unworn permanent magnet 200 is the largest, and the magnetic attraction force on the strain component 300 is also the largest. Correspondingly, the deformation of the strain component 300 is also the largest at this time. As the permanent magnet 200 wears, the magnetic force of the permanent magnet 200 decreases, and the deformation of the strain component 300 also decreases accordingly. Therefore, the deformation of the strain component 300 can reflect the wear amount of the permanent magnet 200, and then the wear amount of the wear-resistant plate 800 of the guide shoe can be monitored (because the permanent magnet 200 is flush with the wear-resistant plate 800, both are subject to the same degree of wear).

[0039] It should be noted that, of course, the top surface of the permanent magnet 200 may be made lower than the top surface of the wear-resistant plate 800 , and monitoring may be performed after the wear-resistant plate 800 is worn to a critical value.

[0040] The coal mining machine guide shoe provided by the embodiment of the present invention is provided with a permanent magnet 200 flush with the wear-resistant plate 800 and a strain component 300 corresponding to the permanent magnet 200 on the guide shoe body 100, so that the strain component 300 is deformed by the magnetic attraction of the permanent magnet 200, and the deformation of the strain component 300 changes with the change of the magnetic attraction. When the wear-resistant plate 800 is worn, the permanent magnet 200 will also be worn, the magnetism will be weakened, and the magnetic field strength will be reduced, thereby causing the strain change of the strain component 300, and the wear degree of the guide shoe can be dynamically detected, and maintenance prompts and warnings can be provided to users in time to avoid economic losses.

[0041] For example, Figures 1 to 4 As shown, the strain component 300 includes an elastomer 310, a deformation measuring unit and a magnetic component 320. The elastomer 310 includes a first section 311 and a second section 312. The second section 312 is connected to the guide shoe body 100. The magnetic component 320 is connected to the position of the first section 311 corresponding to the permanent magnet 200. The deformation measuring unit is arranged on the elastomer 310.

[0042] The elastic body 310 may be made of a material capable of producing elastic deformation, such as a thin steel sheet, a rubber sheet, etc. The magnetic attraction member 320 may be made of a ferromagnetic material, such as an armature.

[0043] For example, Figures 3 to 7 As shown, the deformation measurement unit includes a plurality of strain gauges 330 and a printed circuit board 340. The plurality of strain gauges 330 are arranged on the first section 311 near the magnetic attraction member 320, and the printed circuit board 340 is arranged on the second section 312. The plurality of strain gauges 330 are connected to the printed circuit board 340 to form a full-bridge circuit. The full-bridge circuit can effectively eliminate temperature drift errors.

[0044] In this embodiment, four strain gauges 330 are provided. For example, the strain gauges 330 are resistance strain gauges 330, which are components for measuring strain, such as sensitive grids. The working principle of the resistance strain gauges 330 is based on the strain effect, that is, the conductor or semiconductor material produces mechanical deformation (such as Figure 7 When the sensor is moved in the M direction as shown in the figure, its resistance value changes accordingly. This phenomenon is called "strain effect". When in use, it is firmly pasted on the measuring point of the component. When the component is subjected to force, the measuring point will be strained, and the sensitive grid will also be deformed, causing its resistance to change. The resistance change is then measured by a special instrument and converted into the strain value of the measuring point.

[0045] like Figure 2 and Figure 4As shown, in the embodiment of the present invention, a signal transmitter 400 is further included. The signal transmitter 400 is disposed in the guide shoe body 100 and connected to the full-bridge circuit.

[0046] The permanent magnet 200 attracts the magnetic element 320 to deform the elastomer 310, causing the full-bridge circuit composed of the strain gauge 330 to output a voltage signal. When the wear-resistant plate 800 is worn, the permanent magnet 200 will also be worn, and the size of the permanent magnet 200 in the vertical direction will be reduced, the magnetism will be weakened, and the magnetic field strength will be reduced. This causes the strain of the elastomer 310 to change, which is then fed back to the signal change. By linearly calibrating the signal value with the wear amount of the wear-resistant plate 800, real-time monitoring of the wear amount can be obtained. Its significance lies in that the size and wear degree of the upper and lower gear distances (the distance between the first horizontal part 110 and the second horizontal part 120) of the guide shoe can be dynamically detected, and maintenance prompts and warnings can be provided to users in a timely manner to avoid economic losses.

[0047] like Figure 6 and Figure 7 As shown, a groove is provided in the second horizontal portion 120 of the guide shoe body 100, and the signal transmitter 400 is installed in the groove. The groove has an opening that opens toward the top of the guide shoe body 100, and the upper cover plate 600 covers the opening. In addition, a passage leading from the mounting groove for mounting the strain member 300 to the groove for mounting the signal transmitter 400 is provided in the first horizontal portion 110, and the signal transmitter 400 is connected to the full-bridge circuit through a wire. The signal collected from the full-bridge circuit is an analog voltage signal. After amplification and conversion, the signal is transmitted to the signal transmitter 400 through a wire, and the signal transmitter 400 communicates with the main controller of the coal mining machine by wireless means.

[0048] According to the proportional relationship between the magnetic field strength and volume of the permanent magnet 200, and the method of eliminating temperature drift based on the full-bridge circuit of the resistance strain gauge 330. After the permanent magnet 200 and the wear-resistant plate 800 are worn synchronously, the volume reduction causes the magnetic field strength to change, so that the attraction to the magnetic attraction part 320 is reduced, the deformation of the elastic body 310 is reduced, and the strain is reduced. Through the full-bridge acquisition circuit based on the strain gauge 330 and the analog-to-digital conversion, the signal value and the wear amount are calibrated to obtain their linear relationship. Thus, the wear amount of the guide shoe can be monitored in real time.

[0049] like Figure 3 As shown, the mounting groove includes a first groove section 151 and a second groove section 152 arranged in a horizontal direction, the first groove section 151 corresponds to the permanent magnet 200, the first groove section 151 includes a first bottom surface, the second groove section 152 includes a second bottom surface, the first section 311 is located in the first groove section 151, and there is a gap between the first section 311 and the first bottom surface, the second section 312 is located in the second groove section 152, and the second section 312 is connected to the second bottom surface.

[0050] The second section 312 of the elastomer 310 is fixed to the guide shoe body 100. For example, the second section 312 can be fixed to the guide shoe body 100 by bolts. The first section 311 of the elastomer 310 is in a suspended state to facilitate the deformation of the first section 311 under the attraction of magnetic force, and the first groove section 151 also provides space for the deformation of the first section 311 (there is a gap between the first section 311 and the first bottom surface).

[0051] like Figure 3 As shown, the guide shoe of the coal mining machine further includes a mounting hole for mounting the permanent magnet 200 , and the mounting hole penetrates the wear-resistant plate 800 and extends in the guide shoe body 100 to communicate with the first groove section 151 .

[0052] Optionally, a magnetic isolation sleeve 700 is provided between the inner wall of the mounting hole and the permanent magnet 200. The magnetic isolation sleeve 700 is made of magnetic isolation material, and its function is to prevent the metal in contact with the permanent magnet 200 from being magnetized.

[0053] like Figure 3 As shown, the mounting groove has an opening that opens toward the bottom of the guide shoe body, and the lower cover plate 500 covers the opening.

[0054] like Figure 2 As shown, the coal mining machine guide shoe also includes a first vertical guide surface 131 and a second vertical guide surface 141 opposite to each other, the first vertical guide surface 131 is located in the first vertical part 130, the second vertical guide surface 141 is located in the second vertical part 140, and the first vertical guide surface 131 and the second vertical guide surface 141 are both provided with wear-resistant plates 800.

[0055] Furthermore, an embodiment of the present invention also provides a coal mining machine, which includes: Figures 1 to 7 The specific structure and application of the guide shoe of the coal mining machine in the illustrated embodiment are as described in detail above and will not be repeated here.

[0056] The present invention is based on the proportional relationship between the magnetic field strength and volume of a permanent magnet, and a method for eliminating temperature drift based on a full-bridge circuit of a resistance strain gauge. After the permanent magnet and the wear-resistant plate are synchronously worn, the volume reduction causes the magnetic field strength to change, so that the attraction to the magnetic attraction part is reduced, the deformation of the elastic body is reduced, and the strain is reduced. Through a full-bridge acquisition circuit based on a strain gauge and analog-to-digital conversion, the signal value and the wear amount are calibrated to obtain their linear relationship. Thereby, real-time monitoring of the wear amount of the guide shoe is achieved.

[0057] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the meanings understood by ordinary technicians in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate quantity restrictions, but indicate the existence of at least one. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0058] The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "part" and "component" appearing in this article may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing in this article may represent either a part being directly attached to another part or a part being attached to another part through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0059] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only.

[0060] 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 guide shoe for a coal mining machine, characterized in that: It includes a guide shoe body, a wear-resistant plate, a permanent magnet and a strain member; The guide shoe body comprises a mounting portion connected to the coal mining machine body and a limiting portion arranged opposite to the mounting portion, and a wear-resistant plate is arranged on one side of the limiting portion facing the mounting portion; The permanent magnet is arranged in the wear-resistant plate, a mounting groove is arranged on the guide shoe body at a position close to the permanent magnet, the strain component is arranged in the mounting groove, the strain component is deformed by the magnetic attraction of the permanent magnet, and the deformation amount of the strain component changes with the change of the magnetic attraction, so as to convert the change of the magnetic attraction of the permanent magnet into an electrical signal output; The strain component includes an elastomer, a deformation measuring unit and a magnetic component. The elastomer includes a first section and a second section. The second section is connected to the guide shoe body. The magnetic component is connected to a position on the first section corresponding to the permanent magnet. The deformation measuring unit is arranged on the elastomer.

2. The guide shoe of the coal mining machine according to claim 1, characterized in that: The deformation measurement unit includes a plurality of strain gauges and a printed circuit board. The plurality of strain gauges are arranged on the first section near the magnetic attraction component, and the printed circuit board is arranged on the second section. The plurality of strain gauges are connected to the printed circuit board to form a full-bridge circuit.

3. The guide shoe of the coal mining machine according to claim 2, characterized in that: It also includes a signal transmitter, which is arranged in the guide shoe body and connected to the full-bridge circuit.

4. The guide shoe of the coal mining machine according to claim 2, characterized in that: The mounting groove includes a first groove section and a second groove section, the first groove section includes a first bottom surface, the second groove section includes a second bottom surface, the first section is located in the first groove section, and there is a gap between the first section and the first bottom surface, the second section is located in the second groove section, and the second section is connected to the second bottom surface.

5. The guide shoe of the coal mining machine according to claim 4, characterized in that: The guide shoe body further comprises a mounting hole for mounting the permanent magnet, wherein the mounting hole penetrates the wear-resistant plate and extends in the guide shoe body to communicate with the first groove segment.

6. The guide shoe of the coal mining machine according to claim 5, characterized in that: A magnetic isolation sleeve is arranged between the inner wall of the mounting hole and the permanent magnet.

7. The guide shoe of the coal mining machine according to claim 3, characterized in that: It also includes an upper cover plate. The guide shoe body is provided with a groove. The signal transmitter is installed in the groove. The groove has an opening that opens toward the top of the guide shoe body. The upper cover plate covers the opening.

8. The guide shoe of the coal mining machine according to claim 1, characterized in that: It also includes a lower cover plate, the mounting groove has an opening that opens toward the bottom of the guide shoe body, and the lower cover plate covers the opening.

9. A coal mining machine, characterized in that: It comprises a coal mining machine guide shoe as described in any one of claims 1-8.

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