CN115893248A - Mining push jack and mining system - Google Patents

Abstract

Embodiments of the present invention provide a mine pusher jack and a mining system with the mine pusher jack. Wherein, the mine push jack includes a cylinder body, a piston assembly, a hydraulic system, an isolation sleeve, a laser distance measuring sensor and a reflection plate. One end of the spacer sleeve is connected to one of the cylinder body and the piston assembly, the other end of the spacer sleeve guides and moves relative to the other of the cylinder body and the piston assembly, and the spacer sleeve, the cylinder body and the piston assembly The assembly defines an isolation cavity, each of the laser distance measuring sensor and the reflection plate is arranged in the isolation cavity, one of the laser distance measurement sensor and the reflection plate is arranged on the piston assembly, and the laser distance measurement sensor and the reflection plate The other one is set on the cylinder. Therefore, the pushing jack for mines according to the embodiment of the present invention has the advantages of good anti-interference ability, high accuracy and good stability of travel measurement.

Description

Mining push jacks and mining systems

technical field

The invention relates to the technical field of jacks, in particular to a mining push-type jack and a mining system with the mine push-type jack.

Background technique

The mining push jack is used to connect the hydraulic support and the scraper conveyor, and has the function of pushing and pulling the frame to ensure and adjust the cutting route of the shearer; at the same time, the hydraulic support can follow the machine in time to control the formation of the shearer after cutting. The surrounding rock space is the "link" to realize the coordination of "three machines" in the working face, and its reliable, accurate pushing and pulling are the basis for realizing safe, efficient and intelligent mining in the working face.

In the related art, an external laser ranging jack includes a hydraulic cylinder, a laser ranging sensor and a reflective plate, and the reflective plate is connected to the outer wall of the piston rod head of the hydraulic cylinder. Moreover, this structure does not need to modify the inside of the hydraulic cylinder, and has the advantage of convenient manufacture. However, the reflectors arranged on the outside are easily blocked and interfered by the outside world during use.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the embodiment of the present invention proposes a kind of mine pushing type jack. The push jack for mine has the advantage of high accuracy of stroke measurement.

Embodiments of the present invention also propose a mining system.

The push jack for mining in the embodiment of the present invention includes a cylinder body, a piston assembly, a hydraulic system, an isolation sleeve, a laser distance measuring sensor and a reflection plate.

The piston assembly is movably arranged in the cylinder body along the axial direction of the cylinder body, and the hydraulic system communicates with the inside of the cylinder body so as to drive the piston assembly to move along the axial direction of the cylinder body, so One end of the spacer sleeve is connected to one of the cylinder body and the piston assembly, and the other end of the spacer sleeve guides and moves relative to the other of the cylinder body and the piston assembly, so The isolation sleeve, the cylinder and the piston assembly define an isolation cavity.

Each of the laser distance measuring sensor and the reflection plate is arranged in the isolation cavity, one of the laser distance measurement sensor and the reflection plate is arranged on the piston assembly, and the laser distance measurement sensor and the reflection plate are arranged on the piston assembly. The other of the distance sensor and the reflection plate is arranged on the cylinder body, and the laser distance measuring sensor and the reflection plate are arranged opposite to each other so as to monitor the movement stroke of the piston assembly. In other words, the laser distance measuring sensor is arranged on the piston assembly, and the reflection plate is arranged on the cylinder body; or the reflection plate is arranged on the piston assembly, and the laser distance measurement sensor is arranged on the cylinder body . It can be understood that the isolation sleeve is a hollow structure.

In the mining push-type jack of the embodiment of the present invention, an isolation sleeve is arranged on the jack body (cylinder body, piston assembly and hydraulic system), and an isolation chamber is formed by the isolation sleeve, cylinder body and piston assembly, and the laser distance measuring sensor and The reflection plate is arranged inside the isolation cavity to avoid the problem of the reflection plate being blocked and disturbed in the harsh underground working environment, thereby improving the accuracy and reliability of the stroke measurement of the mine push jack.

In addition, both the laser ranging sensor and the reflector are arranged inside the isolation cavity, which is equivalent to using air as the transmission medium of the laser, which has the advantages of good transmission ability and strong light penetration ability, thereby improving the sensitivity of the stroke measurement of the jack. The advantages of stability and stability of measurement results.

Therefore, the pushing jack for mining in the embodiment of the present invention has the advantages of good anti-interference ability, high accuracy and good stability of stroke measurement.

In some embodiments, the cylinder body includes a bottom and a matching portion, the matching portion has a matching cavity, the piston assembly is arranged in the matching cavity, the wall surface of the matching cavity, the piston assembly and the The bottom defines a hydraulic chamber, the hydraulic system communicates with the hydraulic chamber so as to drive the movement of the piston assembly, the isolation sleeve extends along the axial direction of the cylinder body, and the one end of the isolation sleeve is connected to the The bottom is in sealing connection, the other end of the isolation sleeve is guided to move with the piston assembly, and the isolation cavity is defined by the isolation sleeve, the bottom, and the piston assembly.

In some embodiments, the bottom is provided with a ventilation channel, and the isolation cavity communicates with the outside through the ventilation channel, so as to adjust the gas volume of the isolation cavity as the volume of the isolation cavity changes.

In some embodiments, a filter is provided on the ventilation channel.

In some embodiments, the piston assembly is provided with an accommodating cavity, the other end of the isolation sleeve extends into the accommodating cavity, and the piston assembly is positioned along the cylinder body relative to the isolation sleeve. axis is movable.

In some embodiments, the laser distance measuring sensor is disposed on the bottom, and the reflective plate is disposed on a side of the accommodation cavity opposite to the laser distance measuring sensor.

In some embodiments, the piston assembly includes a connected piston and a piston rod, a part of the piston rod and the piston are arranged in the matching cavity, the wall of the matching cavity, the piston rod, the The piston and the bottom define the outlet hydraulic chamber, the accommodating chamber is opened on the piston rod along the axial direction of the piston rod, and the other end of the spacer sleeve guides and moves with the piston rod Cooperate.

In some embodiments, the mine pusher jack further includes a first sealing ring, and the first sealing ring is arranged between the outer peripheral wall of the piston and the wall surface of the matching cavity.

In some embodiments, the bottom is provided with a mounting hole, the one end of the spacer sleeve protrudes into the mounting hole, and is connected to the wall of the mounting hole, and the laser ranging sensor is arranged on inside the mounting hole.

In some embodiments, the mine push jack further includes a second sealing ring, and the second sealing ring is arranged between the one end of the spacer sleeve and the wall of the installation hole.

In some embodiments, the mine push jack further includes a signal line connector, the mounting hole is a through hole extending axially along the cylinder body, one end of the mounting hole is connected to the spacer sleeve connected, the signal line connector is arranged at the other end of the installation hole.

In some embodiments, the mine push jack further includes a retaining ring, the mounting hole includes a first section and a second section, and the second section is arranged closer to the piston assembly relative to the first section, The cross-sectional area of the first section is larger than the cross-sectional area of the second section, the laser ranging sensor is arranged on the first section, and the first section and the second section form a step portion, so The retaining ring is arranged on the first section and the retaining ring abuts on the stepped portion, the inner diameter of the retaining ring is smaller than the diameter of the second section, and the one end of the spacer sleeve abuts on the on the retaining ring.

In some embodiments, the mine pusher jack further includes a guide ring disposed between the spacer sleeve and the piston assembly.

In some embodiments, the mine push jack further includes an end cover, the end cover covers the other end of the installation hole, and the signal line connector passes through the end cover.

In some embodiments, the mine push jack further includes a third sealing ring, and the third sealing ring is arranged on the wall surface of the end cover and the bottom with installation holes.

The coal mining system provided by the embodiment of the present invention includes a hydraulic support, a scraper conveyor, and a mining push jack according to any one of the above, the cylinder is arranged on the hydraulic support, and the piston assembly extends Part of the cylinder is connected to a scraper conveyor.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a mine pushing jack according to an embodiment of the present invention.

Fig. 2 is a partial view at A in Fig. 1 .

Fig. 3 is a partial view of Fig. 1 .

Reference signs:

Mine push jack 100;

Cylinder body 1; bottom 11; ventilation channel 111; installation hole 112; first section 1121; second section 1122; stepped part 1123; matching part 12;

Piston 21; Piston rod 22; Accommodating cavity 221;

Hydraulic system 3;

Isolation sleeve 4; Isolation cavity 41;

Laser ranging sensor 51; Reflector 52;

filter6;

The first sealing ring 71; the second sealing ring 72; the third sealing ring 73; the fourth sealing ring 74;

Signal line connector 8;

Retaining ring 91; Guide ring 92;

end cap 10.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The mine push jack 100 according to the embodiment of the present invention will be described below with reference to FIGS. 1-3 .

The mine pushing jack 100 in the embodiment of the present invention includes a cylinder body 1 , a piston assembly, a hydraulic system 3 , an isolation sleeve 4 , a laser distance measuring sensor 51 and a reflection plate 52 .

The piston assembly is movable along the axial direction of the cylinder body 1, the hydraulic system 3 communicates with the inside of the cylinder body 1 so as to drive the piston assembly to move along the axial direction of the cylinder body 1, and one end of the isolation sleeve 4 (for example, as shown in Figure 1 The left side of the sleeve 4 is connected to one of the cylinder body 1 and the piston assembly, and the other end of the spacer sleeve 4 (for example, the right side shown in FIG. 1 ) is guided relative to the other of the cylinder body 1 and the piston assembly. Moving, the isolation sleeve 4 , the cylinder body 1 and the piston assembly define an isolation cavity 41 .

Each of the laser ranging sensor 51 and the reflecting plate 52 is arranged in the isolation cavity 41, one of the laser ranging sensor 51 and the reflecting plate 52 is arranged on the piston assembly, and the laser ranging sensor 51 and the reflecting plate 52 The other one is arranged on the cylinder body 1, and the laser ranging sensor 51 and the reflecting plate 52 are arranged oppositely so as to measure the stroke of the piston assembly. In other words, the laser distance measuring sensor 51 is disposed on the piston assembly, and the reflection plate 52 is disposed on the cylinder body 1 ; or the reflection plate 52 is disposed on the piston assembly, and the laser distance measurement sensor 51 is disposed on the cylinder body 1 . It can be understood that the isolation sleeve 4 is a hollow structure.

The mining push jack 100 of the embodiment of the present invention is provided with an isolation sleeve 4 on the jack body (cylinder body 1, piston assembly and hydraulic system 3), and an isolation cavity is formed by the isolation sleeve 4, cylinder body 1 and piston assembly 41. The laser ranging sensor 51 and the reflection plate 52 are arranged inside the isolation cavity 41 to avoid the problem that the reflection plate 52 is blocked and interfered in the harsh working environment underground, thereby improving the stroke measurement of the mine push jack 100. accuracy and reliability.

In addition, the laser ranging sensor 51 and the reflector 52 are both arranged inside the isolation cavity 41, which is equivalent to using air as the transmission medium of the laser, which has the advantages of good transmission ability and strong light penetration ability, and then improves the stroke of the jack. Assay sensitivity and stability of measurement results.

Therefore, the push jack 100 for mining in the embodiment of the present invention has the advantages of good anti-interference ability, high accuracy and good stability of travel measurement.

Specifically, when the cylinder body 1 and the piston assembly of the mining push jack 100 cooperate, the piston assembly will move along the axial direction of the cylinder body 1 (for example, move to the left or right as shown in FIG. 1 ), One of the laser ranging sensor 51 and the reflecting plate 52 will move along with the movement of the piston assembly, and the other of the laser ranging sensor 51 and the reflecting plate 52 is arranged on the cylinder body 1, so the laser ranging The distance between the sensor 51 and the reflector 52 changes as the piston assembly moves. Therefore, the moving stroke of the mine pushing jack 100 is measured through the cooperation between the laser distance measuring sensor 51 and the reflective plate 52 .

As shown in Figures 1 and 2, the cylinder block 1 includes a bottom 11 and a fitting portion 12, the fitting portion 12 has a fitting cavity 13, the piston assembly is arranged in the fitting cavity 13, and the wall surface of the fitting cavity 13, the piston assembly and the bottom 11 define a Hydraulic chamber 14, the hydraulic system 3 communicates with the hydraulic chamber 14 so as to drive the movement of the piston assembly, the isolation sleeve 4 extends along the axial direction of the cylinder body 1, the end of the isolation sleeve 4 (for example, the left side shown in Figure 1 ) is in sealing connection with the bottom 11, the other end of the isolation sleeve 4 guides and moves with the piston assembly, and the isolation sleeve 4, the bottom 11 and the piston assembly define an isolation chamber 41. It can be understood that there is no communication between the isolation chamber 41 and the hydraulic chamber 14 .

Especially when working in an environment with high intensity jitter (for example, a harsh working environment under a mine), the signal of the laser ranging sensor 51 may fluctuate due to the vibration of the reflector 52 and the laser ranging sensor 51 . The push jack 100 for mining in the embodiment of the present invention extends along the axial direction of the cylinder body 1 through the spacer sleeve 4, defines the spacer chamber 41 and the hydraulic chamber 14 by the spacer sleeve 4, the bottom 11 and the piston assembly, and isolates it from the hydraulic chamber 14. Preventing the liquid in the hydraulic system 3 from entering the isolation cavity 41 affects the stability of the light transmission medium of the laser distance measuring sensor 51 and the reflection plate 52 . Thereby, there is an advantage of further improving the accuracy of stroke measurement.

As shown in FIG. 1 and FIG. 2 , the bottom 11 is provided with a ventilation channel 111 , and the isolation chamber 41 communicates with the outside through the ventilation channel 111 , so as to adjust the gas volume of the isolation cavity 41 as the volume of the isolation cavity 41 changes. It can be understood that the volume of the isolation cavity 41 will increase or decrease as the piston assembly moves.

The mine pushing jack 100 of the embodiment of the present invention is provided with an air passage 111 at the end of the isolation chamber 41 near the bottom 11, and the isolation chamber 41 communicates with the outside world through the air passage 111, and the air passage 111 can adjust the temperature in the isolation chamber 41. The air pressure ensures the balance between the air pressure in the isolation cavity 41 and the outside air pressure, and constructs a normal-pressure protective air chamber, so that the laser ranging sensor 51 can work in a normal-pressure environment. As a result, the stability of the structure of the mine pushing jack 100 is improved.

Optionally, a filter 6 is provided on the ventilation channel 111 . The mine pushing jack 100 of the embodiment of the present invention can prevent external dust and water mist from entering the interior of the isolation cavity 41 through the filter 6 arranged in the air passage 111, thereby preventing external impurities from corroding the isolation cavity 41, thereby improving the performance of the isolation cavity 41. The adaptability of the jack application environment.

As shown in Figures 1 and 2, the piston assembly is provided with an accommodation chamber 221, the other end of the isolation sleeve 4 extends into the accommodation chamber 221, and the piston assembly is movable along the axial direction of the cylinder body 1 relative to the isolation sleeve 4 .

In the mining push jack 100 of the embodiment of the present invention, the piston assembly is provided with an accommodation chamber 221, and the other end of the spacer sleeve 4 is extended into the accommodation chamber 221. The axial direction is movable, and the area of the mating surface between the piston assembly and the spacer sleeve 4 is improved. Thus, there is an advantage of improving the airtightness of the isolation chamber 41 .

As shown in FIG. 1 and FIG. 2 , the laser distance measuring sensor 51 is disposed on the bottom 11 , and the reflective plate 52 is disposed on a side of the accommodation cavity 221 opposite to the laser distance measuring sensor 51 .

The mine pushing jack 100 of the embodiment of the present invention is arranged on the bottom 11 through the laser ranging sensor 51, and the reflective plate 52 is arranged on the side of the accommodation cavity 221 opposite to the laser ranging sensor 51, which has the advantages of simple structure and high reliability .

As shown in Figures 1 and 2, the piston assembly includes a connected piston 21 and a piston rod 22, a part of the piston rod 22 and the piston 21 are arranged in the mating cavity 13, and the accommodation cavity 221 is opened in the piston along the axial direction of the piston rod 22. On the rod 22 , the wall surface of the fitting chamber 13 , the piston rod 22 , the piston 21 and the bottom 11 define a hydraulic chamber 14 , and the other end of the spacer sleeve 4 cooperates with the piston rod 22 for guiding and moving. It can be understood that the length of the piston rod 22 along the axial direction of the piston rod 22 is greater than the length of the piston 21 .

In the mining push jack 100 of the embodiment of the present invention, the area of the mating surface between the piston assembly and the isolation sleeve 4 can be increased by opening the accommodation chamber 221 on the piston rod 22 along the axial direction of the piston rod 22 . Thus, there is an advantage of improving the airtightness of the isolation chamber 41 .

Specifically, the accommodating cavity 221 has an opening facing the isolation cavity 41, the other end of the isolation sleeve 4 is passed through the installation hole 112 through the opening, and the piston rod 22 can move along the axial direction of the cylinder body 1 relative to the isolation sleeve 4. .

Optionally, the mining push jack 100 further includes a first sealing ring 71 , and the first sealing ring 71 is arranged between the outer peripheral wall of the piston 21 and the wall surface of the mating cavity 13 . In the pushing jack 100 for mine in the embodiment of the present invention, the sealing performance of the hydraulic chamber 14 can be improved through the first sealing ring 71 arranged between the outer peripheral wall of the piston 21 and the wall surface of the mating chamber 13 .

As shown in Figures 1 and 2, the bottom 11 is provided with a mounting hole 112, one end of the spacer sleeve 4 extends into the mounting hole 112, and is connected to the wall of the mounting hole 112 in a sealed manner, and the laser ranging sensor 51 is arranged in the mounting hole 112 inside.

The mine pushing jack 100 of the embodiment of the present invention is provided with an installation hole 112 at the bottom 11, and one end of the installation hole 112 and the isolation sleeve 4 extends into the installation hole 112, so that the distance between the bottom 11 and the isolation sleeve 4 can be lifted. The mating area between them. Thus, it is beneficial to improve the stability and sealing performance of the connection between the isolation sleeve 4 and the bottom 11 .

As shown in Figures 1 and 2, optionally, the mine push jack 100 of the embodiment of the present invention also includes a second sealing ring 72, and the second sealing ring 72 is arranged between one end of the spacer sleeve 4 and the mounting hole 112. between walls.

The mining push jack 100 of the embodiment of the present invention can improve the sealing performance of the hydraulic chamber 14 through the second sealing ring 72 arranged between one end of the spacer sleeve 4 and the wall surface of the mounting hole 112, and can prevent the hydraulic chamber 14 from The liquid inside enters the isolation chamber 41 . Thereby, there is an advantage of further improving the sensitivity of the jack stroke measurement.

As shown in Figures 1 and 2, the mining push jack 100 also includes a signal line connector 8, and the mounting hole 112 is a through hole extending axially along the cylinder body 1, and one end of the mounting hole 112 communicates with the spacer sleeve 4 , the signal line connector 8 is disposed at the other end of the installation hole 112 .

The mine pushing jack 100 of the embodiment of the present invention, by setting the mounting hole 112 as a through hole extending axially along the cylinder body 1, the laser ranging sensor 51 (the laser ranging sensor 51 is more likely to appear relative to other parts) Failure situation) when a failure occurs, the laser distance measuring sensor 51 can be smoothly taken out and replaced through the provided through hole, without disassembling the entire jack, which improves the convenience of the mining push-type jack 100 for replacement and maintenance.

Further, the central axis of the installation hole 112 is collinear with the central axis of the spacer sleeve 4 .

As shown in Figures 2 and 3, the mining push jack 100 also includes a retaining ring 91, the mounting hole 112 includes a first section 1121 and a second section 1122, and the second section 1122 is arranged closer to the piston assembly relative to the first section 1121, The cross-sectional area of the first section 1121 is greater than the cross-sectional area of the second section 1122, the laser ranging sensor 51 is arranged on the first section 1121, the first section 1121 and the second section 1122 form a step portion 1123, and the retaining ring 91 is arranged on the second section. One section 1121 and the retaining ring 91 abuts on the stepped portion 1123 , the inner diameter of the retaining ring 91 is smaller than the diameter of the second section 1122 , and one end of the spacer sleeve 4 abuts on the retaining ring 91 .

In the push jack 100 for mining in the embodiment of the present invention, the first section 1121 and the second section 1122 are arranged in the mounting hole 112, and the cross-sectional area of the first section 1121 is larger than that of the second section 1122, which is convenient for laser measurement. Positioning from the sensor 51 has the advantage of convenient installation.

In addition, the pushing jack 100 for mine in the embodiment of the present invention has the advantage of being provided with a retaining ring 91 , and one end of the spacer sleeve 4 abuts against the retainer ring 91 , which facilitates the fixing of the spacer sleeve 4 .

The push jack for mining also includes a guide ring 92, which is arranged between the spacer sleeve 4 and the piston assembly. Specifically, the guide ring 92 is disposed between the accommodation chamber and the isolation sleeve.

In the push jack 100 for mining in the embodiment of the present invention, the coaxiality between the spacer sleeve and the piston assembly is maintained through the provided guide ring 92 . As a result, the accommodating cavity is sealed, and at the same time, the guiding performance of the movement of the isolation sleeve is ensured.

Optionally, the mine push jack 100 in the embodiment of the present invention further includes a fourth sealing ring 74, and the fourth sealing ring 74 is arranged between the spacer sleeve 4 and the piston assembly to seal the accommodating cavity.

The push jack 100 for mining in the embodiment of the present invention further includes an end cover 10 covering the other end of the mounting hole 112 , and the signal line connector 8 is passed through the end cover 10 .

The mine pushing jack 100 of the embodiment of the present invention also includes an end cover 10 that can further improve the airtightness in the installation hole 112, can further prevent dust and water vapor from entering the inside of the installation hole 112, and further enhance the sensitivity of the stroke measurement of the jack. The advantages.

Optionally, the mine push jack 100 in the embodiment of the present invention further includes a third sealing ring 73 , and the third sealing ring 73 is arranged on the wall surface of the end cover 10 and the bottom 11 with the installation hole 112 .

The coal mining system in the embodiment of the present invention includes a hydraulic support, a scraper conveyor, and a mining push jack 100 according to any one of the above, the cylinder body is arranged on the hydraulic support, and the part of the piston assembly protruding from the cylinder body is in contact with the scraper. board conveyor.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. A mining push jack, characterized in that it comprises: a cylinder and a piston assembly, the piston assembly being movable axially of the cylinder; a hydraulic system communicating with the interior of the cylinder so as to drive the piston assembly to move axially along the cylinder; An isolation sleeve, one end of the isolation sleeve is connected to one of the cylinder body and the piston assembly, and the other end of the isolation sleeve is opposite to the other of the cylinder body and the piston assembly Or guiding movement, the isolation sleeve, the cylinder and the piston assembly define an isolation cavity; A laser ranging sensor and a reflecting plate, each of the laser ranging sensor and the reflecting plate is arranged in the isolation cavity, and one of the laser ranging sensor and the reflecting plate is arranged in the On the piston assembly, the other of the laser distance measuring sensor and the reflective plate is arranged on the cylinder body, and the laser distance measuring sensor and the reflective plate are arranged opposite to each other so as to measure the stroke of the piston assembly. 2. The push jack for mining according to claim 1, wherein the cylinder body comprises a bottom and a fitting portion, the fitting portion has a fitting cavity, and the piston assembly is arranged in the fitting cavity, so that The wall surface of the matching chamber, the piston assembly and the bottom define a hydraulic chamber, the hydraulic system communicates with the hydraulic chamber so as to drive the movement of the piston assembly, and the isolation sleeve moves along the axis of the cylinder. Extending in the direction, the one end of the spacer sleeve is in sealing connection with the bottom, the other end of the spacer sleeve is sealed and guided to move with the piston assembly, the spacer sleeve, the bottom and the A piston assembly defines the isolation chamber. 3. The push jack for mining according to claim 2, wherein the bottom is provided with a ventilation channel, and the isolation cavity communicates with the outside through the ventilation channel, so that the volume of the isolation cavity increases with the volume of the isolation cavity. changing and adjusting the gas volume of the isolation cavity; Optionally, a filter is provided on the ventilation channel. 4. The mine pushing jack according to claim 2, wherein the piston assembly is provided with an accommodation chamber, the other end of the spacer sleeve extends into the accommodation chamber, and the piston assembly The assembly is movable in the axial direction of the cylinder relative to the spacer sleeve. 5. The push jack for mine according to claim 4, wherein the laser distance measuring sensor is arranged on the bottom, and the reflector is arranged on a side of the accommodation cavity relative to the laser distance measuring sensor. side. 6. The push jack for mining according to claim 4, wherein the piston assembly comprises a connected piston and a piston rod, and a part of the piston rod and the piston are both arranged in the matching cavity, The wall surface of the fitting chamber, the piston rod, the piston and the bottom define the outlet hydraulic chamber, the accommodating chamber is opened on the piston rod along the axial direction of the piston rod, and the spacer sleeve The other end of the barrel cooperates with the guide movement of the piston rod; Optionally, a first sealing ring is also included, and the first sealing ring is arranged between the outer peripheral wall of the piston and the wall surface of the matching cavity. 7. The push jack for mining according to claim 2, characterized in that, the bottom is provided with a mounting hole, and the one end of the spacer sleeve extends into the mounting hole, and is connected with the mounting hole. The walls of the holes are connected, and the laser ranging sensor is arranged in the installation hole; Optionally, a second sealing ring is also included, and the second sealing ring is arranged between the one end of the spacer sleeve and the wall surface of the installation hole. 8. The push jack for mining according to claim 7, further comprising a signal wire connector, the mounting hole is a through hole extending axially along the cylinder body, one end of the mounting hole is connected to the The spacer sleeve is communicated with, and the signal line connector is arranged at the other end of the installation hole. 9. The mine push jack according to claim 8, further comprising a retaining ring, the mounting hole includes a first section and a second section, and the second section is closer to the first section relative to the first section. The piston assembly is set, the cross-sectional area of the first section is greater than the cross-sectional area of the second section, the laser distance measuring sensor is arranged on the first section, the first section and the second section A stepped portion is formed, the retaining ring is arranged on the first section and the retaining ring abuts against the stepped portion, the inner diameter of the retaining ring is smaller than the diameter of the second section, and the spacer sleeve said one end abuts on said retaining ring; And/or, it also includes a third sealing ring, the third sealing ring is arranged on the wall surface of the end cover and the bottom with installation holes; And/or, an end cover is further included, the end cover covers the other end of the installation hole, and the signal line connector is passed through the end cover; And/or, it also includes a guide ring, the guide ring is arranged between the spacer sleeve and the piston assembly; And/or, a fourth sealing ring is further included, the fourth sealing ring is arranged between the isolation sleeve and the piston assembly so as to seal the accommodating cavity. 10. A coal mining system, characterized in that it comprises a hydraulic support, a scraper conveyor and the mine push jack according to any one of claims 1-9, the cylinder is arranged on the hydraulic support Above, the part of the piston assembly protruding from the cylinder is connected with the scraper conveyor.

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