Laser orientation instrument for coal mine

Abstract

The utility model belongs to the technical field of coal mine equipment, and particularly relates to a coal mine laser orientation instrument which comprises a laser orientation instrument body, a fixing rod and an installation assembly arranged on one side of the fixing rod, the installation assembly is used for being connected with an anchor rod, and the coal mine laser orientation instrument further comprises a base and a laser orientation instrument body, the locking assembly comprises a mounting hole formed in the bottom of the base and a replaceable locking piece; wherein the mounting hole is matched with the fixing rod, and the replaceable locking piece is located at the bottom of the base and used for fixing the base and the fixing rod. The mounting structure has the beneficial effects that by arranging the replaceable locking piece, the mounting flexibility is further enhanced, the mounting process is simplified, the time cost of replacement and maintenance is reduced, the replaceable locking piece can be rapidly replaced when damaged, and the replacement cost is low.

Description

Technical Field

[0001] This application belongs to the technical field of coal mine equipment, and particularly relates to a laser pointer for coal mines. Background Art

[0002] A coal mine is a reasonable space excavated by humans when excavating a geological layer rich in coal, usually including roadways, shafts, and working faces, etc. Coal mines are important mining resources. When a coal mine roadway is driven, a laser pointer is required for pointing. A laser pointer is an instrument that uses the principle of laser beam orientation to indicate the construction direction of roadways and tunnels. When a laser pointer is in use, a bracket is required for fixation, and an installation structure is required for installation between the bracket and the laser pointer.

[0003] The patent with the publication number CN210664480U discloses a mine laser pointer, which includes a crosshair laser. A bracket is provided outside the crosshair laser. A fixing rod is provided below the bracket. A fixing ring is fixedly connected to the outer side of the right end of the fixing rod. A locking seat is slidably connected to the top end surface of the fixing ring. An anchor pile installation hole is provided inside the locking seat. The bottom end surface of the bracket is fixedly connected to a base. The fixing rod is slidably connected to the inside of the base. A tightening nut is provided outside the other end of the fixing threaded rod.

[0004] In the above patent, a threaded hole is provided at the bottom end of the base, and an installation screw is spirally connected in the threaded hole. The base is fixed by the installation screw. Although the use of a threaded structure for fixation has the advantages of firm fixation and high adjustability, during the process of multiple tightening and loosening, and under the influence of external factors, the thread is easily damaged. Once the thread on the automatic device is damaged, it will cause inability to fix, and the whole needs to be replaced, resulting in a high cost and the need to modify the machine. Summary of the Utility Model

[0005] The purpose of this application is to provide a laser pointer for coal mines that can solve the above problems.

[0006] The purpose of this application is to provide a laser pointer for coal mines, including a laser pointer body, a fixing rod, and an installation component provided on one side of the fixing rod. The installation component is used to connect with an anchor bolt, and further includes:

[0007] A base, on the top of which a bracket is provided, and the bracket is connected to the bottom of the laser pointer body;

[0008] A locking component, including an installation hole provided at the bottom of the base and a replaceable locking member;

[0009] Wherein, the installation hole is adapted to the fixing rod, and the replaceable locking member is located at the bottom of the base and is used to fix the base and the fixing rod.

[0010] Using one of the above-mentioned laser pointers for coal mines, the laser pointer body is installed on the base through a stable bracket, ensuring the stability and accuracy of laser emission. In complex environments such as coal mine exploitation, accurate direction indication is crucial for ensuring production safety and improving work efficiency. The linearity and accuracy of the laser beam can significantly reduce errors, enabling miners to locate and operate more accurately. The design of the installation component allows the laser pointer to be quickly and flexibly connected to the anchor bolt. At the same time, the replaceable locking piece in the locking component further enhances the flexibility of installation, simplifies the installation process, reduces the time cost of replacement and maintenance, and the setting of the replaceable locking piece can be quickly replaced when damaged, and the replacement cost is relatively low.

[0011] Furthermore, the replaceable locking piece includes:

[0012] A through slot, arranged on the base;

[0013] A plug-in piece, including a limiting part and a plugging part, and the plugging part cooperates with the through slot;

[0014] A threaded hole, arranged on the plugging part and penetrating through the plugging part;

[0015] A first positioning hole, arranged on the base and communicating with the threaded hole;

[0016] A second positioning hole, arranged on the base and communicating with the threaded hole;

[0017] Wherein, it further includes a locking bolt, whose threaded part sequentially passes through the second positioning hole and then is connected to the threaded hole, and after passing through the threaded hole, it enters the first positioning hole, and finally passes through the first positioning hole and contacts the fixed rod.

[0018] The through slot is arranged on the base, providing installation and positioning space for the plugging part of the plug-in piece. The shape and size of the through slot match the shape and size of the plugging part. The plug-in piece includes a limiting part and a plugging part. The limiting part is used to prevent the plug-in piece from falling off after being inserted into the through slot to provide a stable connection. The plugging part is the part that cooperates with the through slot. A threaded hole is arranged on the plugging part for cooperating with the locking bolt to achieve the fastening function. The threaded hole penetrates through the plugging part to ensure that the locking bolt can be smoothly screwed in and firmly connect the plug-in piece and the base. The first positioning hole is arranged on the base and communicates with the threaded hole, allowing the locking bolt to continue to extend forward after passing through the threaded hole until it contacts the fixed rod, playing a role in guiding the direction of the locking bolt to ensure that the locking bolt can accurately contact the fixed rod and apply a fastening force. The second positioning hole is arranged on the base and communicates with the threaded hole. The threaded part of the locking bolt first passes through the second positioning hole and then enters the threaded hole, increasing the flexibility of installation.

[0019] In addition, after the threaded portion of the locking bolt sequentially passes through the second positioning hole and the threaded hole, it enters the first positioning hole and finally contacts the fixing rod. By rotating the locking bolt, it can be firmly tightened on the fixing rod, thereby realizing a stable connection between the base and the fixing rod, ensuring a stable connection between the base of the laser pointer for coal mines and the fixing rod.

[0020] Furthermore: An extension protrusion is provided at the bottom of the base, and its cross-section is circular. The second positioning hole penetrates through the extension protrusion, and a spacer is provided on the extension protrusion. A limiting through-hole for the locking bolt to pass through is provided on the spacer.

[0021] The extension protrusion is provided at the bottom of the base, and its cross-section is circular, which is used to provide a support structure for the second positioning hole, enabling the locking bolt to have a more stable fixing point when passing through the second positioning hole. At the same time, the extension protrusion also extends the locking length, which helps to enhance the firmness of the connection. The second positioning hole penetrates through the extension protrusion and is connected to the threaded hole inside the base, ensuring that the locking bolt can accurately advance along the predetermined path. At the same time, the spacer is provided on the extension protrusion, located between the second positioning hole and the locking bolt, which is used to protect the extension protrusion and the base from the friction and wear generated during the tightening process of the locking bolt, extending the service life of the base. And the design of the limiting through-hole on the spacer can play a certain guiding and limiting role, enabling the locking bolt to maintain the correct direction during the tightening process and preventing the locking bolt from shifting.

[0022] Furthermore, the spacer is threadedly connected to the extension protrusion, and a gasket is also provided on the surface of the spacer.

[0023] By adopting a threaded connection between the spacer and the extension protrusion, it can ensure a tight fit between the two, preventing loosening or falling off. And by providing a gasket on the surface of the spacer, it can further reduce the pressure exerted on the spacer and the extension protrusion by the locking bolt during the tightening process, thereby extending the service life of these components. In addition, the gasket can also prevent the threaded portion of the locking bolt from directly contacting the spacer or the extension protrusion, reducing the wear and scratches caused by friction.

[0024] Furthermore, the diameters of the first positioning hole and the second positioning hole are the same;

[0025] The diameter of the first positioning hole is larger than the diameters of the threaded hole and the locking bolt;

[0026] The diameter of the limiting through-hole is the same as the diameter of the locking bolt;

[0027] Among them, an annular gap is formed between the locking bolt and the second positioning hole.

[0028] The diameters of the first positioning hole and the second positioning hole are the same. The diameter of the first positioning hole is larger than the diameters of the threaded hole and the locking bolt. When the locking bolt passes through the first positioning hole, there is enough space for alignment and fine-tuning, reducing stress concentration or damage caused by improper installation. Moreover, the larger hole diameter also reduces the friction between the bolt and the hole wall, helping to reduce wear during the locking process. The limiting through-hole is used to limit the axial movement of the locking bolt to ensure that it will not loosen due to vibration or external force during operation. An annular gap is formed between the locking bolt and the second positioning hole. At the same time, during the entire installation process, the components with threads and multiple connections are only the locking bolt and the plug-in part. Even if these two components are damaged, the replacement cost is relatively low, and they can be replaced quickly, reducing losses.

[0029] Further, a movable ring is provided on the outer wall of the locking bolt, and the movable ring can move along the annular gap.

[0030] A ring groove coaxial with the threaded hole is provided on the plug-in part.

[0031] A spring is provided between the ring groove and the movable ring.

[0032] Wherein, the diameter of the ring groove is the same as the diameter of the second positioning hole, and the spring is sleeved outside the locking bolt.

[0033] By providing a movable ring on the outer wall of the locking bolt, the movable ring can move freely along the annular gap on the outer wall of the locking bolt. A ring groove coaxial with the threaded hole is provided on the plug-in part, which provides an installation position for the spring. The two ends of the spring are respectively connected to the ring groove and the movable ring. The elastic force of the spring acts on the locking bolt through the movable ring, helping to maintain the tightened state of the locking bolt and preventing it from loosening due to vibration or external force. And when it is necessary to loosen the locking bolt, the user can rotate the locking bolt to overcome the elastic force of the spring, thereby realizing unlocking.

[0034] The beneficial effects of this application are:

[0035] 1. By setting replaceable locking parts, the flexibility of installation is further enhanced, the installation process is simplified, the time cost of replacement and maintenance is reduced, and the replaceable locking parts can be quickly replaced when damaged, and the replacement cost is relatively low.

[0036] 2. The diameters of the first positioning hole and the second positioning hole are the same. The diameter of the first positioning hole is larger than the diameters of the threaded hole and the locking bolt. When the locking bolt passes through the first positioning hole, stress concentration or damage caused by improper installation is reduced. Moreover, the larger hole diameter also reduces the friction between the bolt and the hole wall, helping to reduce wear during the locking process. And among the components with multiple connections, there are only the locking bolt and the plug-in part. Even if these two components are damaged, the replacement cost is relatively low, and they can be replaced quickly, reducing losses.

[0037] 3. By providing a movable ring, a ring groove and a spring, with both ends of the spring connected to the ring groove and the movable ring respectively, the elastic force of the spring acts on the locking bolt through the movable ring, which helps to maintain the tightened state of the locking bolt and prevent it from loosening due to vibration or external force. And when it is necessary to loosen the locking bolt, the user can rotate the locking bolt to overcome the elastic force of the spring, thereby achieving unlocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural view of the present utility model;

[0039] Figure 2 is a schematic internal structural view of the present utility model;

[0040] Figure 3 is Figure 2 an enlarged view of A in

[0041] The reference numerals in the drawings are: 100, the laser pointer body; 200, the fixing rod; 300, the mounting assembly; 400, the base; 410, the bracket; 500, the mounting hole; 600, the replaceable locking member; 610, the through groove; 620, the plug-in member; 621, the limiting portion; 622, the plugging portion; 630, the threaded hole; 640, the first positioning hole; 650, the second positioning hole; 660, the locking bolt; 670, the extended protrusion; 671, the spacer; 672, the limiting through hole; 673, the gasket; 680, the movable ring; 681, the ring groove; 682, the spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0043] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects.

[0044] The following will combine with the accompanying drawings to describe in detail the laser pointer for coal mines provided by the embodiments of the present application through specific embodiments and their application scenarios.

[0045] Embodiment 1:

[0046] As Figures 1 to 3 shown, the embodiment of the present application provides a laser pointer for coal mines, which includes a laser pointer body 100, a fixing rod 200, and a mounting component 300 arranged on one side of the fixing rod 200. The mounting component 300 is used to connect with the anchor bolt, and further includes:

[0047] A base 400, on the top of which there is a bracket 410, and the bracket 410 is connected to the bottom of the laser pointer body 100;

[0048] A locking component, including a mounting hole 500 arranged at the bottom of the base 400 and a replaceable locking member 600;

[0049] Wherein, the mounting hole 500 is adapted to the fixing rod 200, and the replaceable locking member 600 is located at the bottom of the base 400 and is used to fix the base 400 and the fixing rod 200.

[0050] In some implementation manners of the embodiment of the present application, as Figure 1 shown, adopting the above-mentioned laser pointer for coal mines, the laser pointer body 100 is installed on the base 400 through a stable bracket 410, which ensures the stability and accuracy of laser emission. In complex environments such as coal mine exploitation, accurate direction indication is crucial for ensuring production safety and improving work efficiency. The linearity and accuracy of the laser beam can significantly reduce errors, enabling miners to position and operate more accurately. The design of the mounting component 300 allows the laser pointer to be quickly and flexibly connected to the anchor bolt. At the same time, the replaceable locking member 600 in the locking component further enhances the flexibility of installation, simplifies the installation process, reduces the time cost of replacement and maintenance, and the setting of the replaceable locking member 600 can be quickly replaced when damaged, and the replacement cost is relatively low.

[0051] Embodiment 2:

[0052] The embodiment of the present application provides a laser pointer for coal mines. In addition to including the above technical features, the laser pointer for coal mines in the embodiment of the present application further includes the following technical features.

[0053] As Figure 2 and Figure 3 shown, the replaceable locking member 600 includes:

[0054] A through groove 610, arranged on the base 400;

[0055] The connector 620 includes a limiting portion 621 and a plugging portion 622, and the plugging portion 622 is engaged with the through groove 610;

[0056] The threaded hole 630 is provided on the plugging portion 622 and penetrates through the plugging portion 622;

[0057] The first positioning hole 640 is provided on the base 400 and communicates with the threaded hole 630;

[0058] The second positioning hole 650 is provided on the base 400 and communicates with the threaded hole 630;

[0059] Wherein, it further includes a locking bolt 660, the threaded portion of which sequentially passes through the second positioning hole 650 and then is connected to the threaded hole 630, and after passing through the threaded hole 630, it enters the first positioning hole 640, and finally contacts the fixed rod 200 after passing through the first positioning hole 640.

[0060] In the embodiment of the present application, the through groove 610 is provided on the base 400, providing an installation and positioning space for the plugging portion 622 of the connector 620. The shape and size of the through groove 610 match the shape and size of the plugging portion 622. The connector 620 includes a limiting portion 621 and a plugging portion 622. The limiting portion 621 is used to prevent the connector 620 from falling off after being inserted into the through groove 610 to provide a stable connection. The plugging portion 622 is the part that cooperates with the through groove 610. A threaded hole 630 is provided on the plugging portion 622 for cooperating with the locking bolt 660 to achieve the fastening function. The threaded hole 630 penetrates through the plugging portion 622 to ensure that the locking bolt 660 can be smoothly screwed in and firmly connect the connector 620 and the base 400. The first positioning hole 640 is provided on the base 400 and communicates with the threaded hole 630, allowing the locking bolt 660 to continue to extend forward after passing through the threaded hole 630 until it contacts the fixed rod 200, playing a role in guiding the direction of the locking bolt 660 to ensure that the locking bolt 660 can accurately contact the fixed rod 200 and apply a fastening force. The second positioning hole 650 is provided on the base 400 and communicates with the threaded hole 630. The threaded portion of the locking bolt 660 first passes through the second positioning hole 650 and then enters the threaded hole 630, increasing the flexibility of installation.

[0061] In addition, after the threaded portion of the locking bolt 660 sequentially passes through the second positioning hole 650 and the threaded hole 630, it enters the first positioning hole 640 and finally contacts the fixed rod 200. By rotating the locking bolt 660, it can be firmly tightened on the fixed rod 200, thereby realizing a stable connection between the base 400 and the fixed rod 200, ensuring a stable connection between the base 400 of the mine laser pointer and the fixed rod 200.

[0062] Embodiment 3:

[0063] The embodiments of the present application provide a laser pointer for coal mines. In addition to including the above technical features, the laser pointer for coal mines in the embodiments of the present application further includes the following technical features.

[0064] As Figure 2 and Figure 3 As shown, an extension protrusion 670 is provided at the bottom of the base 400. Its cross-section is circular. The second positioning hole 650 penetrates through the extension protrusion 670. And an isolation member 671 is provided on the extension protrusion 670. A limit through-hole 672 for the locking bolt 660 to pass through is provided on the isolation member 671.

[0065] In the embodiments of the present application, the extension protrusion 670 is provided at the bottom of the base 400. Its cross-section is circular and is used to provide a support structure for the second positioning hole 650, so that the locking bolt 660 can have a more stable fixing point when passing through the second positioning hole 650. At the same time, the extension protrusion 670 also extends the locking length, which helps to enhance the firmness of the connection. The second positioning hole 650 penetrates through the extension protrusion 670 and communicates with the threaded hole 630 inside the base 400, ensuring that the locking bolt 660 can accurately advance along the predetermined path. At the same time, the isolation member 671 is provided on the extension protrusion 670, located between the second positioning hole 650 and the locking bolt 660, and is used to protect the extension protrusion 670 and the base 400 from the friction and wear generated during the tightening process of the locking bolt 660, and extends the service life of the base 400. And the design of the limit through-hole 672 on the isolation member 671 can play a certain guiding and limiting role, so that the locking bolt 660 can maintain the correct direction during the tightening process and prevent the locking bolt 660 from shifting.

[0066] Further, the isolation member 671 is threadedly connected to the extension protrusion 670, and a gasket 673 is further provided on the surface of the isolation member 671.

[0067] By adopting a threaded connection between the isolation member 671 and the extension protrusion 670, it can ensure the tight fit between the two and prevent loosening or falling off. And by providing the gasket 673 on the surface of the isolation member 671, it can further reduce the pressure caused by the locking bolt 660 on the isolation member 671 and the extension protrusion 670 during the tightening process, thereby extending the service life of these components. In addition, the gasket 673 can also prevent the threaded part of the locking bolt 660 from directly contacting the isolation member 671 or the extension protrusion 670, reducing the wear and scratches caused by friction.

[0068] Embodiment 4:

[0069] The embodiments of the present application provide a laser pointer for coal mines. In addition to including the above technical features, the laser pointer for coal mines in the embodiments of the present application further includes the following technical features.

[0070] AsFigure 2 and Figure 3 As shown in Figure 3 , the diameters of the first positioning hole 640 and the second positioning hole 650 are the same;

[0071] The diameter of the first positioning hole 640 is larger than the diameters of the threaded hole 630 and the locking bolt 660;

[0072] The diameter of the limiting through hole 672 is the same as the diameter of the locking bolt 660;

[0073] Wherein, an annular gap is formed between the locking bolt 660 and the second positioning hole 650.

[0074] In the embodiment of the present application, the diameters of the first positioning hole 640 and the second positioning hole 650 are the same. The diameter of the first positioning hole 640 is larger than the diameters of the threaded hole 630 and the locking bolt 660. When the locking bolt 660 passes through the first positioning hole 640, there is enough space for alignment and fine adjustment, reducing stress concentration or damage caused by improper installation. Moreover, the larger hole diameter also reduces the friction between the bolt and the hole wall, helping to reduce wear during the locking process. The limiting through hole 672 is used to limit the axial movement of the locking bolt 660 to ensure that it will not loosen due to vibration or external force during operation. An annular gap is formed between the locking bolt 660 and the second positioning hole 650. At the same time, during the entire installation process, the components with threads and multiple connections are only the locking bolt 660 and the plug-in part 620. Even if these two components are damaged, the replacement cost is relatively low, and they can be replaced quickly, reducing losses.

[0075] Embodiment 5:

[0076] The embodiment of the present application provides a laser pointer for coal mines. In addition to including the above technical features, the laser pointer for coal mines in the embodiment of the present application further includes the following technical features.

[0077] As Figure 2 and Figure 3 shown, a movable ring 680 is arranged on the outer wall of the locking bolt 660, and the movable ring 680 can move along the annular gap;

[0078] A ring groove 681 coaxial with the threaded hole 630 is arranged on the plugging part 622;

[0079] A spring 682 is arranged between the ring groove 681 and the movable ring 680;

[0080] Wherein, the diameter of the ring groove 681 is the same as the diameter of the second positioning hole 650, and the spring 682 is sleeved outside the locking bolt 660.

[0081] In the embodiment of the present application, a movable ring 680 is provided on the outer wall of the locking bolt 660. The movable ring 680 can move freely along the annular gap on the outer wall of the locking bolt 660. A ring groove 681 coaxial with the threaded hole 630 is provided on the insertion portion 622, which provides an installation position for the spring 682. The two ends of the spring 682 are respectively connected to the ring groove 681 and the movable ring 680. The elastic force of the spring 682 acts on the locking bolt 660 through the movable ring 680, which helps to maintain the tightened state of the locking bolt 660 and prevent it from loosening due to vibration or external force. And when it is necessary to loosen the locking bolt 660, the user can rotate the locking bolt 660 to overcome the elastic force of the spring 682, thereby realizing unlocking.

[0082] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0083] The embodiments of the present application have been described above with reference to the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A laser pointer for coal mines, comprising a laser pointer body (100), a fixing rod (200) and a mounting assembly (300) arranged on one side of the fixing rod (200), wherein the mounting assembly (300) is used to connect with an anchor rod, and is characterized in that: Also includes: A base (400) having a bracket (410) disposed on the top thereof, wherein the bracket (410) is connected to the bottom of the laser pointing instrument body (100); A locking assembly, comprising a mounting hole (500) disposed at the bottom of the base (400) and a replaceable locking member (600); The mounting hole (500) is adapted to the fixing rod (200), and the replaceable locking member (600) is located at the bottom of the base (400) and is used to fix the base (400) and the fixing rod (200).

2. A laser pointing instrument for coal mines according to claim 1, characterized in that: The replaceable locking member (600) comprises: A through slot (610) is disposed on the base (400); The plug-in connector (620) comprises a limiting portion (621) and a plug-in portion (622), wherein the plug-in portion (622) cooperates with the through slot (610); A threaded hole (630) is disposed on the plug-in portion (622) and passes through the plug-in portion (622); A first positioning hole (640) is provided on the base (400) and is connected to the threaded hole (630); A second positioning hole (650) is provided on the base (400) and is connected to the threaded hole (630); It also includes a locking bolt (660), whose threaded portion passes through the second positioning hole (650) in sequence and is connected to the threaded hole (630), and enters the first positioning hole (640) after passing through the threaded hole (630), and finally passes through the first positioning hole (640) and contacts the fixing rod (200).

3. A laser pointing instrument for coal mines according to claim 2, characterized in that: The bottom of the base (400) is provided with an extended protrusion (670) whose cross section is circular, the second positioning hole (650) passes through the extended protrusion (670), and an isolation piece (671) is provided on the extended protrusion (670), and a limiting through hole (672) for the locking bolt (660) to pass through is provided on the isolation piece (671).

4. A laser pointing instrument for coal mines according to claim 3, characterized in that: The isolating member (671) is connected to the extended protrusion (670) via threads, and a gasket (673) is also provided on the surface of the isolating member (671).

5. A laser pointing instrument for coal mines according to claim 4, characterized in that: The diameters of the first positioning hole (640) and the second positioning hole (650) are the same; The diameter of the first positioning hole (640) is larger than the diameters of the threaded hole (630) and the locking bolt (660); The diameter of the limiting through hole (672) is the same as the diameter of the locking bolt (660); An annular gap is formed between the locking bolt (660) and the second positioning hole (650).

6. A laser pointing instrument for coal mines according to claim 5, characterized in that: A movable ring (680) is provided on the outer wall of the locking bolt (660), and the movable ring (680) can move along the annular gap; The plug-in portion (622) is provided with an annular groove (681) located on the same axis as the threaded hole (630); A spring (682) is provided between the annular groove (681) and the movable ring (680); The diameter of the annular groove (681) is the same as the diameter of the second positioning hole (650), and the spring (682) is sleeved outside the locking bolt (660).

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