Protection device for liquid inlet and return high-pressure rubber hose of coal mine support jack

Abstract

The utility model discloses a coal mine support jack liquid inlet and return high-pressure rubber hose protection device in the technical field of coal mine construction, which comprises a top beam, the top beam adopts a box type truss structure, a plurality of transverse reinforcing rib plates are arranged in the top beam, holes are preset in the bottom of the top beam, and square holes are formed in the reinforcing rib plates in the top beam. The hole and the square hole form a rubber pipe guide channel allowing a liquid inlet and return high-pressure rubber pipe to penetrate, the outer side of the liquid inlet and return high-pressure rubber pipe is sleeved with a protection pipe, a first section pipe body of the protection pipe is fixedly connected with a supporting plate of a coal mine support jack and installed in an inner cavity of the top beam, and the protection pipe is of a corrugated pipe structure. The surface of the pipe body is coated with a basalt fiber woven layer, a polyurethane wear-resistant coating is lined in the pipe body to form a composite protection system, and a universal joint mechanism is arranged at the pipe end. The protection pipe of the corrugated pipe structure is arranged in the top beam of the box type truss structure, the liquid inlet and return high-pressure rubber pipe is protected, and the rubber pipe is not prone to being damaged in the using process and is safer.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coal mine support jack advances and returns liquid high pressure rubber pipe protection device and belongs to the coal mine construction technical field. BACKGROUND

[0002] The coal mine support jack advances and returns liquid high pressure rubber pipe is a key component in the hydraulic support system and is mainly used for transmitting liquid medium with certain pressure and temperature, such as petroleum-based liquid and water-based liquid.

[0003] In the use process of the hydraulic support support plate of the underground working face, the advance and return liquid rubber pipe of the support jack will reserve a length to meet the stroke requirement when the telescopic beam is knocked out, the reserved rubber pipe will naturally droop by a certain length, and the drooping state will be collided and even damaged when the coal mining machine passes, liquid leakage occurs, the high-pressure emulsion in the pipe may cause harm to the workers nearby. SUMMARY

[0004] The utility model discloses a coal mine support jack advances and returns liquid high pressure rubber pipe protection device, and solves the problem of rubber pipe drooping, better protects the rubber pipe, is more beautiful, and the rubber pipe is not easy to damage in the use process and is safer.

[0005] To achieve the above-mentioned purposes, the utility model adopts the following technical scheme:

[0006] Firstly, the utility model provides a coal mine support jack advances and returns liquid high pressure rubber pipe protection device, which comprises a roof beam, the roof beam adopts a box type truss structure, and is internally provided with multiple transverse reinforcing rib plates, a preset hole is formed at the bottom of the roof beam, and square holes are formed in the internal reinforcing rib plates, the hole and the square hole form a rubber pipe guide channel for the advance and return liquid high pressure rubber pipe to pass through, a protection pipe is sleeved on the outer side of the advance and return liquid high pressure rubber pipe, the first pipe body of the protection pipe is connected and fixed with the supporting plate of the coal mine support jack and is installed in the internal chamber of the roof beam, the protection pipe adopts a corrugated pipe structure, the pipe body surface is covered with a basalt fiber woven layer, and a polyurethane wear-resistant coating is lined to form a composite protection system, and a universal joint mechanism is arranged at the pipe end.

[0007] Further, the box side wall of the roof beam is provided with an inspection window, and the inspection window is provided with a quick-release sealing cover plate.

[0008] Further, the first pipe body of the protection pipe in the internal chamber of the roof beam is connected and fixed with the supporting plate of the coal mine support jack through a cross pin and a split pin.

[0009] Further, the inner wall of the protection pipe is integrated with a distributed optical fiber sensor.

[0010] Further, the pipe body of the protection pipe is made of shape memory alloy, piezoelectric ceramic pieces are pre-set on the pipe wall, and a spiral flow guide piece is arranged in the pipe body.

[0011] Further, the protection pipe comprises a single pipe, a telescopic two-stage pipe and a telescopic multi-stage pipe.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] First, the protection pipe with the corrugated pipe structure is arranged in the top beam of the box-shaped truss structure to protect the high-pressure rubber pipe for liquid inlet and outlet, and the problem of the drooping of the rubber pipe is solved, so that the rubber pipe is better protected and more beautiful, and the rubber pipe is not easy to be damaged and is safer during use.

[0014] Second, the corrugated pipe-universal joint composite structure is used to realize three-dimensional space motion compensation capability.

[0015] Third, the distributed optical fiber sensor is integrated on the inner wall of the protection pipe to monitor the surface temperature and strain parameters of the rubber pipe in real time. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof are used to explain the utility model and do not constitute improper limitation on the utility model.

[0017] Figure 1 Fig. 1 is a general schematic view of a coal mine support jack liquid inlet and outlet high-pressure rubber pipe protection device according to an embodiment of the utility model;

[0018] Figure 2 Fig. 2 is a sectional schematic view of the coal mine support jack liquid inlet and outlet high-pressure rubber pipe protection device according to the embodiment of the utility model.

[0019] In the figure, 1 is a telescopic beam, 2 is a top beam, 3 is a support jack, 4 is a supporting plate, 5 is a cross pin, 6 is a split pin, 7 is a protection pipe, 8 is a high-pressure rubber pipe for liquid inlet and outlet, 9 is a square hole, and 10 is a hole. DETAILED DESCRIPTION

[0020] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0021] The following detailed description is exemplary in nature and is intended to provide further description of the present application. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the present application is for describing specific embodiments only and is not intended to be limiting according to the example embodiments of the present application.

[0022] Embodiment:

[0023] Please refer to Figure 1 , a coal mine support jack high-pressure rubber pipe protection device is shown, wherein the telescopic beam 1 is used as a dynamic bearing base, high-strength alloy steel is adopted, and three groups of longitudinal sliding rails are arranged at the bottom and engaged with the hydraulic drive system. The surface of the sliding rail is treated by carburizing to form a 0.5mm thick wear-resistant layer, which ensures that the telescopic amount of 0.02mm / second can be maintained under the working condition of the roof pressure reaching 50MPa. The front end is integrated with a wedge-shaped guide mechanism, which forms dynamic cooperation with the dovetail groove at the bottom of the roof beam 2 to realize the angle self-adaptive adjustment function. Please refer to Figure 2 , the roof beam 2 adopts a box-shaped truss structure, and multiple transverse reinforcing ribs are arranged inside to form a stress dispersion system. The bottom is provided with a hole 10, and the internal reinforcing rib is provided with a square hole 9, and the composite guide hole system composed of the square hole 9 and the hole 10, the center lines of the two holes are inclinedly crossed to form a unique rubber pipe guide channel, and the side wall of the box body is provided with an inspection window, and a quick-release sealing cover plate is arranged to realize visual maintenance of the internal components. The support jack 3 adopts a two-stage piston structure, the main cylinder body is rigidly connected with the telescopic beam 1 through a flange plate, and the end of the auxiliary piston rod is provided with a ball joint to connect with the roof beam 2. The design enables the jack to provide a 2000kN thrust while compensating for a 3° plane deflection error of the support system caused by geological changes. A pressure fluctuation buffer is integrated in the hydraulic circuit to reduce the liquid hammer effect. The supporting plate 4 is used as a force conversion hub, is stamped from a 25mm thick manganese steel plate, and has a 0.8mm thick ceramic coating on the surface. The plate body is provided with a three-stage stepped mounting surface, which forms a surface contact force transmission structure with the flange of the protection pipe 7, the web of the roof beam 2 and the end of the telescopic beam 1, and a pin hole is arranged at the edge to embed a copper-based self-lubricating bushing to ensure the rotation flexibility of the cross pin 5 under the condition of frequent vibration. The protection pipe 7 adopts a segmented corrugated pipe structure, the length of a single section is 300mm, the outer diameter is 45mm, and the wall thickness is 6mm. The pipe body is covered with a basalt fiber woven layer, and the inner lining is a polyurethane wear-resistant coating to form a composite protection system. Adjacent pipe sections are connected through a trapezoidal thread to realize ±20mm axial expansion compensation, and a universal joint mechanism is arranged at the pipe end to adapt to the three-dimensional spatial deformation of the support system.

[0024] When the device is installed downhole, first, the inlet and return fluid high-pressure rubber pipe 8 is sequentially threaded through the hole 10 and square hole 9 of the top beam 2 and then through the protection pipe 7, which specifically includes: first, the top beam 2 is pretreated, and a special guide tool is used to thread the inlet and return fluid high-pressure rubber pipe 8 along a preset path - from the hole 10 at the bottom of the top beam 2, obliquely into the protection pipe 7 through the square hole 9, and then into the inlet end of the protection pipe 7. At this time, attention should be paid to the fact that the bending radius of the rubber pipe should not be less than 8 times the outer diameter to prevent stress concentration of the inner lining.

[0025] The protection pipe 7 is installed in the top beam 2, and then connected and fixed with the support plate 4 by using the cross pin 5 and the split pin 6, which specifically includes: the assembly of the protection pipe 7 adopts a modular construction method, the first pipe body is first pre-connected with the flange surface of the support plate 4, and after calibration by a laser positioning instrument, a hydraulic jacking device is used to send the pipe body into the internal cavity of the top beam 2. When connecting the pipe sections, the phase difference between adjacent corrugated sections should be kept at 180° to ensure uniform distribution of stress during expansion and contraction. After completing the connection of the six pipe bodies, the end pipe section needs to be extended by 300 mm to form a anti-disengagement section. The installation of the cross pin 5 adopts a hot installation process: the pin body is heated to 200℃ and then quickly inserted into the matching hole of the support plate 4 and the top beam 2, and the metal thermal expansion and cold contraction characteristics are used to achieve an interference fit. The split pin 6 innovatively adopts a double-layer locking structure, the inner layer is a spring steel sheet self-locking buckle, and the outer layer is a silicone sealing sleeve, forming a double anti-loose mechanism.

[0026] One end of the inlet and return fluid high-pressure rubber pipe 8 is connected to the support jack 3, and the other end is connected to the bidirectional lock, which specifically includes: the terminal connection of the inlet and return fluid high-pressure rubber pipe 8 adopts dynamic compensation technology, and the end of the support jack 3 is provided with a rotary joint to allow the rubber pipe to deflect by ±15° when the support moves; the bidirectional lock joint adopts a composite structure of conical face sealing and clamp locking to ensure zero leakage under a working pressure of 35 MPa.

[0027] On the basis of the above scheme, the following contents can be further improved to realize structural innovation:

[0028] 1. Intelligent compensation corrugated pipe: The pipe body is made of shape memory alloy, which automatically expands by 20% when the environmental temperature exceeds 50℃. In addition, the piezoelectric ceramic sheet pre-installed in the pipe wall can convert mechanical vibration into electrical energy to provide self-power supply for the monitoring system.

[0029] 2. Conical self-locking cross pin: The pin body surface is processed with micron-level spiral grooves, and a special nano coating is used to make the static friction force self-adaptively enhanced with vibration intensity. Experiments show that this structure can still maintain a displacement constraint of about 0.01 mm under a vibration frequency of 10 Hz.

[0030] 3. Bionic flow guiding system: The top beam 2 is internally provided with a flow guiding groove based on fractal geometry to guide the rubber pipe to form an optimal spatial curve. This design reduces the bending stress of the rubber pipe and actively avoids the interference area during the movement of the support.

[0031] 4、Ecological maintenance design: the detachable design of the supporting plate 4 shortens the time consumption of replacing the main components; the protective tube 7 is made of environmentally friendly composite material and can be completely recycled and reused, reducing the generation of metal waste.

[0032] The scheme introduces the lengthened part of the inlet and return liquid high-pressure rubber pipe 8 into the inside of the top beam 2 when the telescopic beam 1 is stretched out, and protects it, solves the problem of rubber pipe drooping, better protects the rubber pipe, and is more beautiful. The top beam 2 is simple and beautiful below, the rubber pipe is protected and not easy to be damaged, and is safer. The protective tube in the scheme includes a single tube and a telescopic two-stage or multi-stage tube.

[0033] From the technical common sense, the utility model can be realized through other implementation schemes without departing from the spiritual substance or necessary characteristics. Therefore, the above-mentioned disclosed implementation scheme is just an example and is not the only one. All changes within the scope of the utility model or within the scope equivalent to the utility model are included in the utility model.

[0034] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model and are not limited. Although the utility model has been described in detail with reference to the above examples, those skilled in the art should understand that the specific implementation of the utility model can be modified or replaced, and any modification or equivalent replacement without departing from the spirit and scope of the utility model should be covered within the protection scope of the claims of the utility model.

Claims

1. A protective device for the inlet and outlet high-pressure hoses of a coal mine support jack, characterized in that, The structure includes a top beam (2), which adopts a box truss structure and has multiple transverse reinforcing ribs inside. The bottom of the top beam (2) has a pre-set hole (10) and the internal reinforcing ribs have square holes (9). The hole (10) and the square hole (9) form a hose guide channel for the inlet and outlet high-pressure hose (8) to pass through. The outer side of the inlet and outlet high-pressure hose (8) is fitted with a protective tube (7). The first section of the protective tube (7) is connected and fixed to the support plate (4) of the coal mine support jack and installed in the internal cavity of the top beam (2). The protective tube (7) adopts a corrugated pipe structure, the surface of the tube is covered with a basalt fiber braided layer, and the inner lining is a polyurethane wear-resistant coating to form a composite protection system. The tube end is equipped with a universal joint mechanism.

2. The high-pressure hose protection device for the inlet and outlet of the coal mine support jack according to claim 1, characterized in that, The top beam (2) has an inspection window on its side wall, and the inspection window is equipped with a quick-release sealing cover.

3. The high-pressure hose protection device for the inlet and outlet of the coal mine support jack according to claim 1, characterized in that, The first section of the protective pipe (7) located in the inner cavity of the top beam (2) is connected and fixed to the support plate (4) of the coal mine support jack by a horizontal pin (5) and a cotter pin (6).

4. The high-pressure hose protection device for the inlet and outlet of the coal mine support jack according to claim 1, characterized in that, The inner wall of the protective tube (7) integrates a distributed optical fiber sensor.

5. The high-pressure hose protection device for the inlet and outlet of the coal mine support jack according to claim 1, characterized in that, The protective tube (7) is made of shape memory alloy, with piezoelectric ceramic plates pre-placed on the tube wall and spiral guide plates built into the tube body.

6. The high-pressure hose protection device for the inlet and outlet of the coal mine support jack according to claim 1, characterized in that, The protective tube (7) includes a single tube, a retractable two-stage tube, and a multi-stage tube.

Images