A coal mine tunnel support anchor net fixing device and use method thereof

Abstract

The present invention discloses a coal mine tunnel support anchor net fixing device and a use method thereof. Disclosed are a fixing device and a use method thereof. When the anchor rod body is deeply inserted into a borehole to fix the anchor net, a pushing component is used to push the expansion part to expand outwards and press against the hole wall, so that the installation of the anchor rod body is more stable, and a pressure monitoring component is used to continuously monitor the mine pressure. The fixing device and a use method thereof are characterized in that the fixing device comprises an anchor rod body, a pushing component arranged in the anchor rod body, an expansion part arranged at one end of the anchor rod body, and a pressure monitoring component arranged on the pushing component, a detachable anchor rod pad is arranged at the other end of the anchor rod body, the anchor rod body is deeply inserted into the borehole to fix the anchor net, and the pushing component pushes the expansion part to expand outwards and press against the hole wall after contacting the rock wall at the top of the borehole, so that the installation of the anchor rod body is more stable, and the pressure monitoring component can continuously monitor the mine pressure.

Description

Technical Field

[0001] The invention discloses a coal mine tunnel support anchor net fixing device and a use method thereof, and relates to an anchor net fixing device used for coal mine tunnel support and a use method thereof, and belongs to the technical field of coal mine equipment. Background Art

[0002] During coal mining, in order to prevent the mine pressure from damaging the coal mine tunnels and causing damage to the personnel and equipment in the tunnels, the coal mine tunnels need to be supported. The most common coal mine tunnel support method is anchor mesh support. Anchor mesh support usually fixes the metal mesh on the tunnel rock wall through anchor rods and trays. Because there will be a certain gap between the anchor rods and the hole wall, it is generally necessary to use an anchoring agent to bond the anchor rods and the hole wall to prevent the anchor rods from falling off. However, this method only relies on the bonding force of the anchoring agent, which is prone to problems such as a shortened anchoring length and premature reaction of the anchoring agent components due to improper installation of the anchoring agent, and the expected anchoring effect cannot be achieved. The anchor rods fall off due to vibration during coal mining, causing safety hazards. In addition, the existing anchor rods cannot monitor the mine pressure when fixing the anchor mesh. When the mine pressure is greater than the maximum tensile shear strength that the anchor rod can withstand, the anchor rod will break, making it difficult to achieve its support function for the coal mine tunnel, thereby posing a threat to the safety of underground personnel and equipment.

[0003] Publication No. CN211975015U discloses a coal mine underground support anchor net fixing device, comprising an anchor rod, a casing is sleeved on the top of the anchor rod, a spiral blade is welded and fixed on the annular side of the casing, a connecting sleeve and a threaded sleeve are sleeved on the anchor rod, the connecting sleeve is located at the lower side of the casing, the threaded sleeve is located at the lower side of the connecting sleeve, and the left and right sides of the connecting sleeve are connected to the threaded sleeve through a push rod, a pressing plate, a pad and a nut are sleeved on the lower part of the anchor rod, a top plate is welded and fixed on the upper side of the pressing plate, the pad is located between the pressing plate and the nut, the nut is connected to the anchor rod through threaded engagement, and the nut is located at the lower side of the pad, and the pressing plate is located at the lower side of the threaded sleeve. The fixing device stably tightens the anchor net through the pressing plate, but the device cannot monitor the mine pressure when fixing the anchor net. When the mine pressure is greater than the maximum tensile shear strength that the anchor rod can withstand, the anchor rod will break, making it difficult to achieve its supporting function for the coal mine tunnel, thereby posing a threat to the safety of underground personnel and equipment. Summary of the invention

[0004] In order to improve the above situation, the present invention provides a coal mine tunnel support anchor net fixing device and a use method thereof. When the anchor rod body is deeply inserted into the drill hole to fix the anchor net, the expansion part is pushed outward by the pushing component to tighten the hole wall, so that the installation of the anchor rod body is more stable, and the pressure monitoring component is used to continuously monitor the mine pressure. Fixing device and use method thereof.

[0005] The invention discloses a coal mine tunnel support anchor net fixing device, which is realized as follows: the invention discloses a coal mine tunnel support anchor net fixing device, which comprises an anchor rod body, a pushing assembly arranged in the anchor rod body, an expansion part arranged at one end of the anchor rod body, and a pressure monitoring assembly arranged on the pushing assembly, wherein a detachable anchor rod pad is arranged at the other end of the anchor rod body.

[0006] It is characterized in that the anchor rod body goes deep into the borehole to fix the anchor net, and the pushing component pushes the expansion part to expand outward and tighten the hole wall after contacting the top rock wall of the borehole, so that the installation of the anchor rod body is more stable, and the pressure monitoring component can continuously monitor the mine pressure.

[0007] The middle part of the anchor rod body is provided with a mounting groove.

[0008] Preferably, a threading hole is opened in the middle of the anchor rod body, and the threading hole is connected to the mounting groove.

[0009] Preferably, the notch of the installation groove is flush with one end of the anchor rod body, and the distance from the bottom of the installation groove to the notch is half of the length of the anchor rod body.

[0010] Preferably, the extension part is a hollow rod structure with openings at both ends.

[0011] Preferably, the inner diameter of the extension portion is equal to the inner diameter of the mounting groove.

[0012] Preferably, a plurality of groups of rubber protrusions are arranged at equal intervals on the outer wall of the extension portion.

[0013] The pushing assembly is composed of a feed head, an expansion rod, a sliding straight rod and a compression spring.

[0014] The compression spring is placed in the installation groove, one end of the compression spring is connected to the bottom of the installation groove, the other end of the compression spring is connected to one end of the sliding straight rod, and the other end of the sliding straight rod passes through the installation groove and extends into the expansion part.

[0015] Preferably, the sliding straight rod can slide relative to the mounting groove, and the diameter of the sliding straight rod is equal to the inner diameter of the mounting groove.

[0016] Preferably, the sliding straight rod can slide relative to the expansion portion.

[0017] One end of the extension rod is connected to the other end of the sliding straight rod, and the other end of the extension rod passes through the extension part and is connected to the feed head.

[0018] Preferably, the diameter of the expansion rod gradually increases from one end to the other end.

[0019] Preferably, the diameter of one end of the extension rod is equal to the diameter of the sliding straight rod.

[0020] Preferably, the expansion rod can slide relative to the expansion portion.

[0021] Preferably, the feed head is a truncated cone structure, and the large bottom edge is connected to the other end of the extension rod.

[0022] Preferably, the diameter of the large bottom side of the feed head is equal to the diameter of the other end of the extension rod.

[0023] Preferably, a threading hole is opened in the middle of the sliding straight rod.

[0024] The pressure monitoring assembly is composed of a sliding plate, a through slot, a slide slot, an electric telescopic rod, a connecting plate and a pressure sensor.

[0025] The outer wall of the extension portion is provided with a plurality of slide grooves at equal intervals along the circumferential direction, and the slide plate can be slidably placed in the slide grooves.

[0026] Preferably, the distance from the bottom of the chute to the notch is greater than the thickness of the sliding plate.

[0027] A through groove is opened on the inner wall of the extension part corresponding to the slide groove.

[0028] Preferably, the through groove is connected to the middle of the corresponding slide groove.

[0029] The connecting plate can be slidably placed in the through slot.

[0030] Preferably, the connecting plate is a long strip structure, one side of the connecting plate is connected to the sliding straight rod, and the other side is in contact with one side of the sliding plate.

[0031] Preferably, the width of the connecting plate is equal to the width of the through slot.

[0032] Preferably, the length of the connecting plate is slightly smaller than the length of the sliding plate.

[0033] One end of a plurality of electric telescopic rods is equidistantly arranged on one side of the sliding plate, and the other end of the electric telescopic rod passes through the connecting plate and is arranged in the sliding straight rod. A placement groove is opened on the other side of the sliding plate, and the pressure sensor is arranged in the placement groove.

[0034] Beneficial effects.

[0035] First, the expansion part can be expanded outward to tighten the hole wall, making the installation of the anchor rod body more stable.

[0036] Second, it can continuously monitor the mine pressure on the anchor rod so as to remind the staff to take corresponding measures in time.

[0037] 3. The compression spring can buffer the vibration of the anchor rod body and reduce the possibility of the anchor pad falling off due to vibration.

[0038] 4. Simple structure, convenient and practical, easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a three-dimensional structural diagram of a coal mine tunnel support anchor net fixing device of the present invention;

[0040] Figure 2 It is a three-dimensional structural diagram of a sliding expansion structure of a coal mine tunnel support anchor net fixing device of the present invention;

[0041] Figure 3 It is a structural schematic diagram of a cross section of a coal mine tunnel support anchor net fixing device of the present invention;

[0042] Figure 4 It is a structural schematic diagram of a coal mine tunnel support anchor net fixing device of the present invention;

[0043] Figure 5 The present invention is a schematic structural diagram of a sliding expansion structure of a coal mine tunnel support anchor net fixing device.

[0044] In the attached figure

[0045] The components include: an anchor rod pad (1), an anchor rod body (2), a sliding plate (3), an extension portion (4), a feed head (5), an extension rod (6), a through groove (7), a slide groove (8), an electric telescopic rod (9), a connecting plate (10), a sliding straight rod (11), a compression spring (12), and a pressure sensor (13). DETAILED DESCRIPTION

[0046] A coal mine tunnel support anchor net fixing device of the present invention is implemented as follows: it comprises an anchor rod body (2), a pushing assembly arranged in the anchor rod body (2), an expansion portion (4) arranged at one end of the anchor rod body (2), and a pressure monitoring assembly arranged on the pushing assembly, wherein a detachable anchor rod pad (1) is arranged at the other end of the anchor rod body (2).

[0047] The invention is characterized in that the anchor rod body (2) penetrates into the borehole to fix the anchor net, and the pushing component pushes the expansion part (4) to expand outwards and press against the hole wall after contacting the rock wall at the top of the borehole, so that the installation of the anchor rod body (2) is more stable, and the pressure monitoring component can continuously monitor the mine pressure.

[0048] The anchor rod body (2) has a mounting groove in the middle.

[0049] Preferably, a threading hole is opened in the middle of the anchor rod body (2), and the threading hole is connected to the mounting groove.

[0050] Preferably, the notch of the installation groove is flush with one end of the anchor rod body (2), and the distance from the bottom of the installation groove to the notch is half the length of the anchor rod body (2).

[0051] Preferably, the extension portion (4) is a hollow rod structure with openings at both ends.

[0052] Preferably, the inner diameter of the extension portion (4) is equal to the inner diameter of the mounting groove.

[0053] Preferably, a plurality of groups of rubber protrusions are arranged at equal intervals on the outer wall of the extension portion (4).

[0054] The pushing assembly is composed of a feed head (5), an expansion rod (6), a sliding straight rod (11) and a compression spring (12).

[0055] The compression spring (12) is placed in the installation groove, one end of the compression spring (12) is connected to the bottom of the installation groove, the other end of the compression spring (12) is connected to one end of the sliding straight rod (11), and the other end of the sliding straight rod (11) passes through the installation groove and extends into the expansion part (4).

[0056] Preferably, the sliding straight rod (11) can slide relative to the mounting groove, and the diameter of the sliding straight rod (11) is equal to the inner diameter of the mounting groove.

[0057] Preferably, the sliding straight rod (11) can slide relative to the expansion portion (4).

[0058] One end of the extension rod (6) is connected to the other end of the sliding straight rod (11), and the other end of the extension rod (6) passes through the extension part (4) and is connected to the feed head (5).

[0059] Preferably, the diameter of the expansion rod (6) gradually increases from one end to the other end.

[0060] Preferably, the diameter of one end of the extension rod (6) is equal to the diameter of the sliding straight rod (11).

[0061] Preferably, the expansion rod (6) is slidable relative to the expansion portion (4).

[0062] Preferably, the feed head (5) is a truncated cone structure, and the large bottom edge is connected to the other end of the extension rod (6).

[0063] Preferably, the diameter of the larger bottom side of the feed head (5) is equal to the diameter of the other end of the extension rod (6).

[0064] Preferably, a threading hole is opened in the middle of the sliding straight rod (11).

[0065] The pressure monitoring assembly is composed of a sliding plate (3), a through groove (7), a sliding groove (8), an electric telescopic rod (9), a connecting plate (10) and a pressure sensor (13).

[0066] The outer wall of the expansion portion (4) is provided with a plurality of slide grooves (8) at equal intervals along the circumferential direction, and the sliding plate (3) can be slidably placed in the slide grooves (8).

[0067] Preferably, the distance from the bottom of the slide groove (8) to the groove opening is greater than the thickness of the sliding plate (3).

[0068] A through groove (7) is formed on the inner wall of the extension portion (4) at a position corresponding to the slide groove (8).

[0069] Preferably, the through groove (7) and the corresponding slide groove (8) are connected in the middle.

[0070] The connecting plate (10) is slidably disposed in the through groove (7).

[0071] Preferably, the connecting plate (10) is a long strip structure, one side of the connecting plate (10) is connected to the sliding straight rod (11), and the other side is in contact with one side of the sliding plate (3).

[0072] Preferably, the width of the connecting plate (10) is equal to the width of the through slot (7).

[0073] Preferably, the length of the connecting plate (10) is slightly smaller than the length of the sliding plate (3).

[0074] One end of a plurality of electric telescopic rods (9) are equidistantly arranged on one side of the sliding plate (3); the other end of the electric telescopic rod (9) passes through the connecting plate (10) and is placed in the sliding straight rod (11); a placement groove is opened on the other side of the sliding plate (3), and the pressure sensor (13) is placed in the placement groove;

[0075] Preferably, the anchor rod body (2) is a precision-rolled right-handed fully threaded steel bar;

[0076] Preferably, the sliding plate (3) is made of austenite-ferrite duplex stainless steel material, which is a stainless steel with austenite and ferrite structures each accounting for about half. When the C content is low, the Cr content is 18% to 28%, and the Ni content is 3% to 10%. Some steels also contain alloying elements such as Mo, Cu, Si, Ti, Nb, and N. This type of steel has the characteristics of both austenite and ferrite stainless steels. Compared with ferritic stainless steel, it has higher plasticity and toughness, no room temperature brittleness, and significantly improved intergranular corrosion resistance and welding performance; at the same time, it also maintains the 475"C brittle tower and high thermal conductivity of ferritic stainless steel, has superplasticity, etc., and compared with austenitic stainless steel, it has high strength and significantly improved intergranular corrosion resistance and chlorine chloride corrosion resistance. Duplex stainless steel has excellent pitting corrosion resistance and is also a nickel-saving stainless steel;

[0077] The present invention also relates to a method for using a coal mine tunnel support anchor net fixing device, which is characterized by comprising the following steps:

[0078] 1) Using a bolting machine to drive the bolt body (2) into the drill hole;

[0079] 2) After the feed head (5) contacts the rock wall at the bottom of the borehole, the bolting machine is used to continue to advance the bolt body (2);

[0080] 3) The feed head (5) is subjected to the reaction force of the rock wall, and the expansion rod (6) moves downward, thereby driving the sliding straight rod (11) to move downward and squeeze the compression spring (12). Since the diameter of the expansion rod (6) gradually increases from one end to the other end, the expansion rod (6) pushes the expansion part (4) to expand outward and press against the hole wall during the downward movement, so that the installation of the anchor rod body (2) is more stable;

[0081] 4) controlling the electric telescopic rod (9) to extend, so that the electric telescopic rod (9) pushes the sliding plate (3) to move outward, thereby driving the pressure sensor (13) to fit the borehole wall, thereby continuously monitoring the internal pressure of the mine;

[0082] 5) The pressure sensor (13) transmits the monitored pressure signal to the mine monitoring system. When the mine pressure exceeds the set threshold, the mine monitoring system issues an alarm to promptly remind the staff to take corresponding measures;

[0083] 6) Install the anchor pad (1) and tighten the anchor net;

[0084] The notch of the installation groove is flush with one end of the anchor rod body (2), and the distance from the bottom of the installation groove to the notch is designed to be half the length of the anchor rod body (2), so that when the extension rod (6) pushes the sliding straight rod (11) to move downward and squeezes the compression spring (12), it can ensure that there is enough space in the installation groove for the sliding straight rod (11) to move;

[0085] The design that the inner diameter of the expansion part (4) is equal to the inner diameter of the installation groove, and the diameter of the sliding straight rod (11) is equal to the inner diameter of the installation groove, enables the expansion rod (6) to move downward, thereby driving the sliding straight rod (11) to move downward and compress the compression spring (12) without shaking, thereby making the expansion rod (6) more stable when pushing the expansion part (4) to expand outward and press against the hole wall;

[0086] The design of equidistantly arranging a plurality of groups of rubber protrusions on the outer wall of the extension part (4) can increase the friction between the extension part (4) and the hole wall when the extension rod (6) pushes the extension part (4) to expand outwards and press against the hole wall, thereby making the installation of the anchor rod body (2) more stable;

[0087] The diameter of the expansion rod (6) gradually increases from one end to the other end, and the design that the diameter of one end of the expansion rod (6) is equal to the diameter of the sliding straight rod (11) enables the expansion rod (6) to squeeze the expansion portion (4) when it starts to move downward, pushing the expansion portion (4) to expand outward and press against the hole wall, and at the same time, enables the connection between the expansion rod (6) and the sliding straight rod (11) to be smooth, so that the expansion rod (6) can move easily in the expansion portion (4);

[0088] The distance from the bottom of the sliding groove (8) to the groove opening is greater than the thickness of the sliding plate (3), so that the sliding plate (3) does not contact the hole wall when the anchor rod body (2) enters the drill hole, thereby preventing sliding friction between the hole wall and the sliding plate (3) from causing damage to the pressure sensor (13) placed in the groove;

[0089] The design that the width of the connecting plate (10) is equal to the width of the through slot (7) can prevent the sliding straight rod (11) from twisting when the expansion rod (6) drives the sliding straight rod (11) to move downward and squeeze the compression spring (12), thereby preventing the electric telescopic rod (9) from being damaged and making it unable to push the sliding plate (3) to move outward, thereby driving the pressure sensor (13) to fit the borehole wall and continuously monitoring the internal pressure of the mine;

[0090] When the anchor rod body (2) penetrates deep into the borehole to fix the anchor net, the push component pushes the expansion part (4) to expand outwards and press against the hole wall, so that the installation of the anchor rod body (2) is more stable, and the pressure monitoring component is used to continuously monitor the mine pressure.

[0091] The above embodiments are preferred embodiments of the present invention. In order to save space, the applicant has not added other embodiments, but this is not intended to limit the scope of the present invention. Any ordinary technician in the field can make some improvements without departing from the scope of the present invention, that is, all equivalent improvements made according to the present invention should be covered by the scope of the present invention.

Claims

1. A coal mine tunnel support anchor net fixing device, comprising an anchor rod body, a pushing assembly arranged in the anchor rod body, an expansion portion arranged at one end of the anchor rod body, and a pressure monitoring assembly arranged on the pushing assembly, wherein a detachable anchor rod pad is arranged at the other end of the anchor rod body, characterized in that The anchor rod body penetrates deep into the borehole to fix the anchor net, and the pushing component pushes the expansion part to expand outward and tighten the hole wall after contacting the rock wall at the top of the borehole, so that the installation of the anchor rod body is more stable, and the pressure monitoring component can continuously monitor the mine pressure, and an installation groove is opened in the middle of the anchor rod body, and a threading hole is opened in the middle of the anchor rod body, and the threading hole and the installation groove are connected, and the notch of the installation groove is flush with one end of the anchor rod body, and the distance from the bottom of the installation groove to the notch is half of the length of the anchor rod body. The pushing component consists of a feed head, an expansion rod, a sliding straight rod and a compression spring, and the compression spring is placed in the installation groove. One end of the spring is connected to the bottom of the mounting groove, the other end of the compression spring is connected to one end of the sliding straight rod, the other end of the sliding straight rod passes through the mounting groove and extends into the expansion part, one end of the expansion rod is connected to the other end of the sliding straight rod, the other end of the expansion rod passes through the expansion part and is connected to the feed head, a threading hole is opened in the middle of the sliding straight rod, the pressure monitoring assembly is composed of a sliding plate, a through groove, a slide groove, an electric telescopic rod, a connecting plate and a pressure sensor, the through groove is connected to the middle of the corresponding slide groove, the connecting plate is a long strip structure, one side of the connecting plate is connected to the sliding straight rod, and the other side is in contact with one side of the sliding plate, the feed head is a frustum structure, and the large bottom edge and The other end of the extension rod is connected, the diameter of the large bottom side of the feed head is equal to the diameter of the other end of the extension rod, the sliding straight rod can slide relative to the installation groove, the diameter of the sliding straight rod is equal to the inner diameter of the installation groove, the sliding straight rod can slide relative to the extension part, the extension part is a hollow rod body structure, and the two ends are open structures, the inner diameter of the extension part is equal to the inner diameter of the installation groove, a plurality of groups of rubber protrusions are equidistantly arranged on the outer wall of the extension part, a plurality of sliding grooves are equidistantly opened on the outer wall of the extension part along the circumferential direction, the sliding plate can be slidably placed in the sliding groove, a through groove is opened at the inner wall of the extension part corresponding to the sliding groove, the connecting plate can be slidably placed in the through groove, and a plurality of electric One end of the telescopic rod, the other end of the electric telescopic rod passes through the connecting plate and is placed in the sliding straight rod. A placement groove is opened on the other side of the sliding plate, and the pressure sensor is placed in the placement groove. The diameter of the extension rod gradually increases from one end to the other end. The diameter of one end of the extension rod is equal to the diameter of the sliding straight rod. The extension rod can slide relative to the extension part. The width of the connecting plate is equal to the width of the through groove. When the extension rod drives the sliding straight rod to move downward and squeezes the compression spring, the sliding straight rod can be prevented from twisting and causing damage to the electric telescopic rod, so that it cannot push the sliding plate to move outward, thereby driving the pressure sensor to fit the wall of the borehole to continuously monitor the internal pressure of the mine.

2. A coal mine tunnel support anchor net fixing device according to claim 1, characterized in that The distance from the bottom of the sliding groove to the groove opening is greater than the thickness of the sliding plate, and the length of the connecting plate is slightly smaller than the length of the sliding plate.

3. A method for using a coal mine tunnel support anchor net fixing device is applied to a coal mine tunnel support anchor net fixing device as claimed in any one of claims 1-2, characterized in that The following steps are involved: 1) Use the bolting machine to drive the bolt body into the drill hole; 2) After the feed head contacts the rock wall at the bottom of the borehole, continue to use the bolter to advance the bolt body; 3) The feed head is subjected to the reaction force of the rock wall and presses the expansion rod downward, which in turn drives the sliding straight rod to move downward and squeezes the compression spring. As the diameter of the expansion rod gradually increases from one end to the other, the expansion rod pushes the expansion part outward to press against the hole wall during the downward movement, making the installation of the anchor rod body more stable; 4) Control the extension of the electric telescopic rod, which pushes the sliding plate outward, thereby driving the pressure sensor to fit the borehole wall to continuously monitor the internal pressure of the mine; 5) The pressure sensor transmits the monitored pressure signal to the mine monitoring system. When the mine pressure exceeds the set threshold, the mine monitoring system issues an alarm to remind the staff to take corresponding measures in time; 6) Install the anchor pad and tighten the anchor net.

Images