Permanent magnet eddy current on-off valve for internal spraying of a cutting unit of a roadheader

Abstract

The present application belongs to the technical field of anchor digging equipment, and particularly relates to a permanent magnet eddy current switch valve for internal spraying of a cutting part of an anchor digging machine; the permanent magnet eddy current switch valve comprises a conductor disc assembly, a magnet disc assembly and a water supply input shaft assembly; the conductor disc assembly internally comprises two water channels and a cavity; the water supply input shaft assembly passes through the cavity of the conductor disc assembly, the conductor disc assembly can rotate relative to the water supply input shaft assembly, the water channel in the water supply input shaft assembly is in communication with the cavity of the conductor disc assembly; the magnet disc assembly is arranged in the cavity of the conductor disc assembly and is sleeved on the water supply input shaft assembly; the conductor disc assembly is used for being connected with a drum of the cutting part and rotating with the drum; in the two states of the drum of the cutting part of the anchor digging machine being stopped and rotating, internal pressure water of the cutting part of the anchor digging machine is respectively supplied to an internal spraying system and a telescopic hydraulic cylinder, the hydraulic cylinder telescopic action in the static state is realized, the hydraulic cylinder is locked in the cutting drum rotating state, and the water channel goes to a spraying pipeline to realize spraying.

Description

Technical Field

[0001] This invention belongs to the technical field of tunneling and anchoring equipment, specifically relating to a permanent magnet eddy current switching valve for spraying inside the cutting section of a tunneling and anchoring machine. Background Technology

[0002] The main dust control technologies for tunneling faces include external spraying and internal spraying. However, these technologies have failed to achieve the desired dust removal effect. The main reason is that the tunneling machinery generates a large amount of dust instantaneously during cutting operations. The corresponding dust control technologies cannot prevent dust diffusion and dust settling in time. The diffused dust spreads throughout the entire tunneling face, and the dispersed nature of the dust makes dust control quite difficult.

[0003] Internal spraying technology involves channeling water through the internal channels of the cutting head or cutting drum, ultimately forming a water mist that is sprayed out from nozzles on the cutting head or drum. This water mist binds to the dust generated during cutting, causing it to settle due to gravity and preventing its spread, thus achieving dust removal. Furthermore, internal spraying can also eliminate sparks and extend the life of the cutting teeth. Therefore, installing an internal spraying system in a roadheader / anchor is both necessary and urgent.

[0004] Because roadheader-mounted machines use a telescopic, full-width cutting drum, the cutting reducer has a high-pressure oil passage at its center to drive the hydraulic cylinder for telescopic movement. Since the cutting drum rotates during operation, and the center of the cutting reducer is occupied by the oil inlet of the telescopic hydraulic cylinder, there is no water inlet for internal spraying. Therefore, many domestically produced roadheader-mounted machines currently do not have an internal spraying system.

[0005] This invention proposes a water inlet switch for a roadheader, located inside the cutting drum, for controlling the extension and retraction of the water-medium hydraulic cylinder and switching the internal spray water path. When the cutting drum rotates, the control switch switches the water supply to the internal spray system; when the cutting drum stops rotating, the control switch switches the water supply to the water supply system of the water-medium hydraulic cylinder, thereby adjusting the width of the cutting drum. Summary of the Invention

[0006] The purpose of this invention is to provide a permanent magnet eddy current switch structure for automatically switching the hydraulic circuit of the cutting section of a roadheader, under the premise that the telescopic hydraulic cylinder of the roadheader is set as a water-medium hydraulic cylinder, which has the function of switching the high-pressure water circuit direction when the cutting section of the roadheader is stationary and rotating.

[0007] The present invention provides the following technical solution: a permanent magnet eddy current switching valve for spraying inside the cutting section of a roadheader, comprising a conductor disk assembly, a magnet disk assembly and a water supply input shaft assembly;

[0008] The conductor disk assembly includes two water channels and a cavity, with both water channels connected to the cavity from the outside.

[0009] The water supply input shaft assembly passes through the cavity of the conductor disk assembly and a rotation seal is provided between the two. The conductor disk assembly can rotate relative to the water supply input shaft assembly, and the water channel inside the water supply input shaft assembly is connected to the cavity of the conductor disk assembly.

[0010] The magnet disk assembly is placed inside the cavity of the conductor disk assembly. The magnet disk assembly is fitted onto the water supply input shaft assembly, and it can slide relative to the conductor disk assembly in the axial direction but cannot rotate in the circumferential direction.

[0011] The conductor disk assembly is used to connect to the drum of the cutting section and rotate with the drum; the magnetic force between the conductor disk assembly and the magnet disk assembly drives the magnet disk assembly to slide on the water supply input shaft assembly and switch the connection and disconnection between the two water channels in the conductor disk assembly and the cavity.

[0012] Furthermore, the conductor disk assembly includes a left flange and a non-ferromagnetic conductor disk yoke. The left flange and the non-ferromagnetic conductor disk yoke are fastened together to form a cavity in the middle. A seal is installed between the left flange and the non-ferromagnetic conductor disk yoke. Each of the left flange and the non-ferromagnetic conductor disk yoke has a water channel connecting to the cavity.

[0013] Inside the cavity, a copper disk is set on the outer ring of the non-ferromagnetic conductor disk yoke, and a first graphite ring is set on the inner ring. Iron blocks are uniformly embedded along the inner edge of the copper disk.

[0014] Furthermore, the magnet disk assembly includes a non-ferromagnetic magnet disk yoke, a ferromagnetic magnet disk backplate, and a permanent magnet;

[0015] The non-ferromagnetic magnet disk yoke is supported on the water supply input shaft assembly. Permanent magnets are evenly distributed on the non-ferromagnetic magnet disk yoke around the water supply input shaft assembly. The permanent magnets face the copper disk, and the magnetic poles of the permanent magnets are axial. The N poles and S poles are arranged alternately. The copper disk on the back of the ferromagnetic magnet disk back plate is mounted on the non-ferromagnetic magnet disk yoke.

[0016] Furthermore, the water passage within the non-ferromagnetic conductor disk yoke is connected to the cavity through the annular space gap between the non-ferromagnetic conductor disk yoke and the water supply input shaft assembly; the water passage within the left flange is connected to the cavity through the annular space gap between the left flange and the water supply input shaft assembly.

[0017] The water channel in the water supply input shaft assembly is connected to the cavity of the conductor disk assembly through the radial hole in the magnet disk assembly, and there is a space for movement at the connection between the water channel and the radial hole. When the magnet disk assembly slides, the water channel and the radial hole remain connected. Seals are installed between the magnet disk assembly and the water supply input shaft assembly before and after the water channel.

[0018] A water passage gap is reserved between the side of the magnet disk assembly and the cavity. A seal is set between the end face of the magnet disk assembly and the cavity. When the end face of the magnet disk assembly is in contact with either the non-ferromagnetic conductor disk yoke or the left flange, the water passage inside it is sealed off, and the water passage in the other is connected to the water supply input shaft assembly.

[0019] Furthermore, the water supply input shaft assembly includes a water supply input shaft, an end sleeve, and a triangular shaft section of the water supply input shaft. The triangular shaft section of the water supply input shaft is detachably connected to the water supply input shaft and is fixed by the shoulder of the water supply input shaft and the end sleeve. The end sleeve is connected to the water supply input shaft by screws. The magnet disk assembly is assembled on the triangular shaft section of the water supply input shaft.

[0020] Furthermore, a second graphite ring of the ring-sleeved water supply input shaft assembly is provided on the mating surface of the non-ferromagnetic magnet disk yoke and the left flange, and a first graphite ring of the ring-sleeved water supply input shaft assembly is provided on the mating surface of the non-ferromagnetic conductor disk yoke and the non-ferromagnetic magnet disk yoke.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] This invention provides a permanent magnet eddy current switching valve for spraying within the cutting section of a roadheader. During the cutting operation (cutting drum rotates, i.e., the conductor disk assembly rotates, while the magnet disk assembly and water supply input shaft assembly do not rotate), the copper conductor disk cuts magnetic lines of force, generating an induced magnetic field opposite in polarity to the magnet disk. This drives the permanent magnet to move to the left, simultaneously moving the non-ferromagnetic magnet disk yoke and the second graphite ring. The second graphite ring then tightly seals the first straight-through water passage with the left flange, connecting the water inlet to the second straight-through joint, thus enabling the spraying action. During the telescopic operation (cutting drum does not rotate, i.e., the conductor disk assembly and water supply input shaft assembly do not rotate), the annularly distributed iron blocks on the non-ferromagnetic conductor disk yoke attract the permanent magnet to move to the right, simultaneously moving the non-ferromagnetic magnet disk yoke and pressing it against the first graphite ring. This tightly seals the second straight-through water passage with the non-ferromagnetic conductor disk yoke, connecting the water inlet to the first straight-through joint, thus enabling the hydraulic cylinder telescopic action. It should have the characteristics of effective opening and closing, long service life, novel design, simple structure, convenient manufacturing, low price, and easy installation. Attached Figure Description

[0023] Figure 1 Diagram showing the extension / retraction state of a permanent magnet eddy current switching valve;

[0024] Figure 2 Diagram showing the cutting operation state of a permanent magnet eddy current switching valve;

[0025] Figure 3 A diagram showing the distribution of fan-shaped grooves on the yoke of a nonferromagnetic magnet disk;

[0026] Figure 4 A diagram showing the distribution of embedded iron blocks on the yoke of a nonferromagnetic conductor disk.

[0027] Figure 5 A schematic diagram of the structure of a nonferromagnetic conductor disk yoke;

[0028] Figure 6 This is a schematic diagram of the water supply input shaft.

[0029] Figure 7 Schematic diagram of the cross-section of the triangular shaft segment of the water supply input shaft;

[0030] In the diagram: 1-Water supply input shaft; 101-Water supply input shaft triangular section; 2-Left flange; 3-First straight connector; 4-Second straight connector; 5-Non-ferromagnetic conductor disc yoke; 51-First embedded iron block; 52-Second embedded iron block; 53-Third embedded iron block; 54-Fourth embedded iron block; 6-Copper disc; 7-End sleeve; 8-First screw; 9-Second screw; 10-First Glyd ring; 11-Second Glyd ring; 12-First O-ring seal; 13-Permanent magnet; 130-First permanent magnet; 131-Second permanent magnet Magnet; 132-Third permanent magnet; 133-Fourth permanent magnet; 134-Fifth permanent magnet; 135-Sixth permanent magnet; 136-Seventh permanent magnet; 137-Eighth permanent magnet; 138-Ninth permanent magnet; 139-Tenth permanent magnet; 14-Non-ferromagnetic magnet disk yoke; 15-Ferromagnetic magnet disk back plate; 16-First graphite ring; 17-Second graphite ring; 18-Third Glyd ring; 19-Fourth Glyd ring; 20-Hydraulic cylinder base; 21-Third screw; 22-Fourth screw; 23-Second O-ring seal. Detailed Implementation

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] like Figure 1 , Figure 2The diagram shows a permanent magnet eddy current switching valve for spraying within the cutting section of a roadheader, comprising a conductor disc assembly, a magnet disc assembly, and a water supply input shaft assembly. The conductor disc assembly includes two water passages and a cavity, with both water passages communicating with the cavity from the outside. The water supply input shaft assembly passes through the cavity of the conductor disc assembly and has a rotational seal between it and the conductor disc assembly. The conductor disc assembly can rotate relative to the water supply input shaft assembly, and the water passages within the water supply input shaft assembly communicate with the cavity of the conductor disc assembly. The magnet disc assembly is placed within the cavity of the conductor disc assembly and is fitted onto the water supply input shaft assembly. It can slide axially relative to the magnet disc assembly but cannot rotate circumferentially. The conductor disc assembly is connected to and rotates with the drum of the cutting section. The left side of the conductor disc assembly is connected to the flange of the cutting drum base. The magnetic force between the conductor disc assembly and the magnet disc assembly drives the magnet disc assembly to slide on the water supply input shaft assembly, switching the connection between the two water passages within the conductor disc assembly and the cavity.

[0033] The conductor disc assembly includes a left flange 2 and a non-ferromagnetic conductor disc yoke 5. The non-ferromagnetic conductor disc yoke 5 is made entirely of a non-ferromagnetic material, such as stainless steel. The left flange 2 and the non-ferromagnetic conductor disc yoke 5 are fastened together to form a cavity. The left flange 2 and the non-ferromagnetic conductor disc yoke 5 are connected as a whole by bolts. A seal is installed between the left flange 2 and the non-ferromagnetic conductor disc yoke 5. Each of the left flange 2 and the non-ferromagnetic conductor disc yoke 5 has a water passage connecting to the cavity. A first straight-through connector 3 is installed at the outlet of the water passage in the left flange 2, and a second straight-through connector 4 is installed at the outlet of the water passage in the non-ferromagnetic conductor disc yoke 5. The non-ferromagnetic conductor disc yoke 5 is sealed to the water supply input shaft assembly by a first Glyd ring 10, and the left flange 2 is sealed to the water supply input shaft 1 by a fourth Glyd ring 19.

[0034] like Figure 4 , Figure 5 As shown: Inside the cavity, a copper disk 6 is arranged on the outer ring of the non-ferromagnetic conductor disk yoke 5, and a first graphite ring 16 is arranged on the inner ring. Iron blocks are uniformly embedded along the inner edge of the copper disk 6.

[0035] The magnet disk assembly includes a non-ferromagnetic magnet disk yoke 14, a ferromagnetic magnet disk back plate 15, and a permanent magnet 13;

[0036] like Figure 3 As shown: The non-ferromagnetic magnet disk yoke 14 is supported on the water supply input shaft assembly. Permanent magnets 13 are evenly distributed around the water supply input shaft assembly on the non-ferromagnetic magnet disk yoke 14, with the permanent magnets 13 facing the copper disk 6. The magnetic poles of the permanent magnets 13 are axial, with N and S poles arranged alternately. The copper disk 6 is mounted on the back of the ferromagnetic magnet disk back plate 15 on the non-ferromagnetic magnet disk yoke 14. Specifically, the ferromagnetic magnet disk back plate 15 is embedded in a groove on the left end face of the non-ferromagnetic magnet disk yoke 14.

[0037] The water passage within the non-ferromagnetic conductor disc yoke 5 is connected to the cavity through the annular space gap between the non-ferromagnetic conductor disc yoke 5 and the water supply input shaft assembly; the water passage within the left flange 2 is connected to the cavity through the annular space gap between the left flange 2 and the water supply input shaft assembly.

[0038] The water channel in the water supply input shaft assembly is connected to the cavity of the conductor disk assembly through the radial hole in the magnet disk assembly, and there is a space for movement at the connection between the water channel and the radial hole. When the magnet disk assembly slides, the water channel and the radial hole remain connected. Seals are installed between the magnet disk assembly and the water supply input shaft assembly before and after the water channel.

[0039] A water passage gap is reserved between the side of the magnet disk assembly and the cavity. A seal is provided between the end face of the magnet disk assembly and the cavity. When the end face of the magnet disk assembly is in contact with either the non-ferromagnetic conductor disk yoke 5 or the left flange 2, the water passage inside it is sealed off, and the water passage in the other is connected to the water supply input shaft assembly.

[0040] like Figure 6 , Figure 7 As shown: The water supply input shaft assembly includes a water supply input shaft 1, an end sleeve 7, and a triangular shaft section 101 of the water supply input shaft. The triangular shaft section 101 of the water supply input shaft is detachably connected to the water supply input shaft 1 and is fixed by the shoulder of the water supply input shaft 1 and the end sleeve 7. The end sleeve 7 is connected to the water supply input shaft 1 by screws 9. The magnet disk assembly is assembled on the triangular shaft section 101 of the water supply input shaft, and the magnet disk assembly and the triangular shaft section 101 of the water supply input shaft are sealed by a second Glyd ring 11 and a third Glyd ring 18.

[0041] A second graphite ring 17 of the ring-shaped water supply input shaft assembly is provided on the mating surface of the non-ferromagnetic magnet disk yoke 14 and the left flange, and a first graphite ring 16 of the ring-shaped water supply input shaft assembly is provided on the mating surface of the non-ferromagnetic conductor disk yoke 5 and the non-ferromagnetic magnet disk yoke 14.

[0042] When the conductor disk assembly (fixed to the roller) rotates, the surface of the copper disk 6 set in the groove on the nonferromagnetic conductor disk yoke 5 cuts the magnetic lines of force of the permanent magnet 13 set in the fan-shaped groove on the nonferromagnetic magnet disk yoke 14. The eddy currents formed on the surface of the copper disk 6 will generate an induced magnetic field. The induced magnetic field will interact with the original magnetic field of the permanent magnet 13, generating torque and axial force. However, the torque on the nonferromagnetic magnet disk yoke 14, the permanent magnet 13 and the ferromagnetic magnet disk back plate 15 is limited by the water supply input shaft 1. Under the action of the axial force, the second graphite ring 17 is driven to press on the left flange 2. At this time, pressurized water enters from the water supply input shaft 1, and reaches the internal spray system through the second straight connector 4 set on the side of the nonferromagnetic conductor disk yoke 5 along the internal cavity.

[0043] When the drum stops rotating (the conductor disk assembly stops rotating), the non-ferromagnetic conductor disk yoke 5 and the copper disk 6 also stop rotating, and there is no relative movement between them and the permanent magnet 13. At this time, under the attraction of the first embedded iron block 51, the second embedded iron block 52, the third embedded iron block 53, and the fourth embedded iron block 54 evenly distributed in the annular area within the permanent magnet 13, the non-ferromagnetic conductor disk yoke 5, and the copper disk 6, the non-ferromagnetic conductor disk yoke 14 is evenly pressed onto the first graphite ring 16 connected to the non-ferromagnetic conductor disk yoke 5. At this time, pressurized water enters from the water supply input shaft 1, passes through the first straight connector 3 set on the side of the left flange 2 along the internal cavity, and reaches the hydraulic cylinder supply port, which can control the extension and retraction of the hydraulic cylinder.

[0044] In the cutting section of this roadheader, the permanent magnet eddy current switch valve, during cutting operation, pushes the permanent magnet 13 to the left, causing the non-ferromagnetic magnet disc yoke 14 and the second graphite ring 17 to move synchronously. This causes the second graphite ring 17 to tightly seal the first straight-through connector 3 with the left flange 2, connecting the water supply input shaft 1 to the second straight-through connector 4. During extension / retraction operation, the non-ferromagnetic conductor disc yoke 5 attracts the permanent magnet 13 to the right, causing the non-ferromagnetic magnet disc yoke 15 to move synchronously and press against the first graphite ring 16. This causes the non-ferromagnetic magnet disc yoke 14 to tightly seal the second straight-through connector 4 with the non-ferromagnetic conductor disc yoke 5, connecting the water supply input shaft 1 to the first straight-through connector 3. The permanent magnet eddy current switch in the roadheader's cutting section features effective opening and closing, long service life, simple structure, easy manufacturing, low price, and convenient installation.

[0045] In the context of using water-medium hydraulic cylinders, the use of permanent magnet eddy current switching switches cleverly utilizes the axial force generated by permanent magnet eddy currents to switch between the spray water path and the hydraulic cylinder extension and retraction function, realizing both the hydraulic cylinder extension and retraction function and the internal spray function, without making major modifications to the system structure, thus adapting to various types of tunneling and anchoring machines.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A permanent magnet eddy current switching valve for spraying within the cutting section of a roadheader, characterized in that: Includes conductor disk assembly, magnet disk assembly, and water supply input shaft assembly; The conductor disk assembly includes two water channels and a cavity, with both water channels connected to the cavity from the outside. The water supply input shaft assembly passes through the cavity of the conductor disk assembly and a rotation seal is provided between the two. The conductor disk assembly can rotate relative to the water supply input shaft assembly, and the water channel inside the water supply input shaft assembly is connected to the cavity of the conductor disk assembly. The magnet disk assembly is placed inside the cavity of the conductor disk assembly. The magnet disk assembly is fitted onto the water supply input shaft assembly, and it can slide relative to the conductor disk assembly in the axial direction but cannot rotate in the circumferential direction. The conductor disk assembly is used to connect to the drum of the cutting section and rotate with the drum; the magnetic force between the conductor disk assembly and the magnet disk assembly pushes the magnet disk assembly to slide on the water supply input shaft assembly, switching the connection and disconnection between the two water passages in the conductor disk assembly and the cavity. The conductor disk assembly includes a left flange (2) and a non-ferromagnetic conductor disk yoke (5). The left flange (2) and the non-ferromagnetic conductor disk yoke (5) are fastened together to form a cavity in the middle. A seal is installed between the left flange (2) and the non-ferromagnetic conductor disk yoke (5). Each of the left flange (2) and the non-ferromagnetic conductor disk yoke (5) has a water channel connecting to the cavity. Inside the cavity, a copper disk (6) is set on the outer ring of the non-ferromagnetic conductor disk yoke (5), and a first graphite ring (16) is set on the inner ring. Iron blocks are uniformly set along the inner edge of the copper disk (6). The magnetic disk assembly includes a non-ferromagnetic magnetic disk yoke (14), a ferromagnetic magnetic disk back plate (15), and a permanent magnet (13). The nonferromagnetic magnet disk yoke (14) is supported on the water supply input shaft assembly. The permanent magnet (13) is evenly distributed on the nonferromagnetic magnet disk yoke (14) around the water supply input shaft assembly. The permanent magnet (13) faces the copper disk (6). The magnetic poles of the permanent magnet (13) are axial, with N poles and S poles arranged alternately. The copper disk (6) on the back of the ferromagnetic magnet disk back plate (15) is mounted on the nonferromagnetic magnet disk yoke (14).

2. The permanent magnet eddy current switching valve for spraying inside the cutting section of a roadheader according to claim 1, characterized in that: The water passage in the non-ferromagnetic conductor disc yoke (5) is connected to the cavity through the annular space gap between the non-ferromagnetic conductor disc yoke (5) and the water supply input shaft assembly; the water passage in the left flange (2) is connected to the cavity through the annular space gap between the left flange (2) and the water supply input shaft assembly. The water channel in the water supply input shaft assembly is connected to the cavity of the conductor disk assembly through the radial hole in the magnet disk assembly, and there is a space for movement at the connection between the water channel and the radial hole. When the magnet disk assembly slides, the water channel and the radial hole remain connected. Seals are installed between the magnet disk assembly and the water supply input shaft assembly before and after the water channel. A water passage gap is reserved between the side of the magnet disk assembly and the cavity. A seal is set between the end face of the magnet disk assembly and the cavity. When the end face of the magnet disk assembly is in contact with either the non-ferromagnetic conductor disk yoke (5) or the left flange (2), the water passage inside is closed and cut off. The water passage in the other is connected to the water supply input shaft assembly.

3. A permanent magnet eddy current switching valve for spraying inside the cutting section of a roadheader according to claim 2, characterized in that: The water supply input shaft assembly includes a water supply input shaft (1), an end sleeve (7), and a triangular shaft section (101) of the water supply input shaft. The triangular shaft section (101) of the water supply input shaft is detachably connected to the water supply input shaft (1) and is fixed by the shoulder of the water supply input shaft (1) and the end sleeve (7). The end sleeve (7) is connected to the water supply input shaft (1) by screws (9). The magnet disk assembly is mounted on the triangular shaft section (101) of the water supply input shaft.

4. A permanent magnet eddy current switching valve for spraying inside the cutting section of a roadheader according to claim 2, characterized in that: A second graphite ring (17) of a ring-shaped water supply input shaft assembly is provided on the mating surface of the non-ferromagnetic magnet disk yoke (14) and the left flange, and a first graphite ring (16) of a ring-shaped water supply input shaft assembly is provided on the mating surface of the non-ferromagnetic conductor disk yoke (5) and the non-ferromagnetic magnet disk yoke (14).

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