Adjustable-height support assembly for coal shearer

Abstract

The present invention relates to a support assembly for a shearer with adjustable height, which comprises a sliding shoe, a support base, a piston, a leg, a guide sleeve and a two-way hydraulic control check valve. The lower part of the leg is hinged to the sliding shoe. The leg is provided with an upper rectangular groove and a lower circular groove. The guide sleeve is threadedly connected to the upper part in the circular groove. The middle and lower parts of the support base are respectively made into rod-shaped structures with rectangular cross-sections and circular cross-sections. The piston is threadedly sleeved on the lower section of the rod-shaped structure with a circular cross-section. The space between the piston in the circular groove and below the guide sleeve and the circular groove forms an oil cylinder structure by sliding up and down in a sliding fit. The two chambers above and below the piston are respectively connected to the two oil outlets of the two-way hydraulic control check valve through two oil holes in the support base. The present invention has a long service life, can improve the coal loading capacity of the shearer in the downward mining state, can absorb part of the vibration of the shearer, and prolong the service life of the shearer drum.

Description

Technical Field

[0001] The present invention relates to a support assembly for a shearer, the height of which is adjustable, and belongs to the technical field of coal mining equipment. Background Art

[0002] The support assembly is one of the key components for supporting the shearer and enabling the shearer to move. One end of it is connected to the shearer body through a pin shaft assembly, and the other end rides on the scraper conveyor plow or the trough rib plate through a sliding shoe. The support assembly is a vulnerable part in the shearer, and the main manifestation of wear is the failure of the sliding shoe due to wear and the shortening of the height. The wear of the support assembly will cause the shearer to form an inclined layout structure on the working face. On the one hand, it further increases the abnormal wear of the guiding sliding shoe. On the other hand, the inclined layout causes the shearer to form a downward mining on the working face, resulting in a decrease in the coal loading capacity. Summary of the Invention

[0003] To solve the above problems, the present invention provides a support assembly for a shearer with adjustable height, which has a long service life and can improve the coal loading capacity of the shearer in the downward mining state.

[0004] The main technical solutions of the present invention are as follows:

[0005] A support assembly for a shearer with adjustable height, including a sliding shoe, a support seat assembly and a leg assembly. The lower part of the leg assembly is hinged to the sliding shoe through a pin shaft, and the lower part of the support seat assembly is inserted into the upper groove of the leg assembly to form an oil cylinder structure that can be telescoped up and down.

[0006] The leg assembly may include a leg and a guide sleeve. The top of the leg is provided with a groove, which includes an upper rectangular groove and a lower circular groove. The upper part of the circular groove is provided with internal threads, and the guide sleeve is threadedly connected to the upper part of the circular groove with its external threads. The support seat assembly may include a support seat and a piston. The middle and lower parts of the support seat are respectively made into rod-shaped structures with rectangular cross-sections and circular cross-sections. The lower section of the rod-shaped structure with a circular cross-section is provided with external threads, and the piston is threadedly sleeved outside the lower section of the rod-shaped structure with a circular cross-section with its internal threads. The piston slides up and down in the circular groove in cooperation with the lower part of the circular groove, and the two are sealed by an O-ring. The upper section of the rod-shaped structure with a circular cross-section slides up and down in the guide sleeve in cooperation with the guide sleeve, and the two are sealed by an O-ring. The rod-shaped structure with a rectangular cross-section is located in the rectangular groove and slides up and down in cooperation with the rectangular groove. When the piston moves down to the bottom limit position of the circular groove, there is a vertical gap between the piston and the guide sleeve.

[0007] Two oil holes are provided in the support seat, one end of the two oil holes is opened on the top surface of the support seat, the other end of the two oil holes is opened on the bottom surface of the support seat, and the other end is opened on the outer cylindrical surface of the rod-shaped structure of the circular cross-section of the support seat and is located above the piston, and when the piston moves down to the bottom limit position of the circular groove, it is located below the guide sleeve.

[0008] The height-adjustable coal mining machine support assembly may also include a two-way hydraulically controlled one-way valve, which is installed on the support seat. Two oil holes are opened at the ends of the top surface of the support seat and are respectively connected to the two oil outlets of the two-way hydraulically controlled one-way valve. The two oil inlets of the two-way hydraulically controlled one-way valve are connected to the pressure oil source and the return oil tank through a reversing valve.

[0009] The pressure oil source and the return oil tank are both provided by the coal mining machine system, and are connected to the reversing valve via the oil supply pipeline and the return oil pipeline provided by the coal mining machine system.

[0010] The stroke of the oil cylinder structure is preferably no greater than 20 cm.

[0011] Two O-ring mounting grooves are provided at intervals in the upper and lower parts on the outer cylindrical surface of the piston, in which O-rings are installed to seal between the piston and the lower part of the circular groove; two O-ring mounting grooves are provided at intervals in the upper and lower parts on the inner cylindrical surface of the guide sleeve, in which O-rings are installed to seal between the upper section of the rod-shaped structure with a circular cross-section and the guide sleeve.

[0012] The height-adjustable coal mining machine support assembly preferably also includes two overflow valves, which are respectively connected to the two one-way valves in the two-way hydraulically controlled one-way valve. The specific connection method is: the oil inlet of each overflow valve is connected to the oil outlet of one of the two-way hydraulically controlled one-way valves, and the oil outlet is connected to the oil inlet of the other one-way valve in the two-way hydraulically controlled one-way valve.

[0013] The lower portion of the leg rides on the ear of the sliding shoe and is hinged by the pin.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides an oil cylinder structure in the support assembly, and the height of the support assembly can be changed by adjusting the extension amount of the oil cylinder structure. When the sliding shoe is worn, the oil cylinder structure is adjusted to extend to a corresponding height according to the wear amount measurement value of the sliding shoe, so that the height of the support assembly can be kept equal to the height of the support assembly when the sliding shoe is not worn, so that the coal mining machine can be maintained to mine coal in parallel, the service life of the sliding shoe is extended, and the service life of the support assembly is increased.

[0016] When a shearer is mining coal underground, the working face conditions change frequently. By using the support assembly of the present invention, when there is an undulating working face, especially a downhill mining working face, the influence of the downhill mining working face can be reduced or eliminated by adjusting the telescopic amount of the oil cylinder structure, thereby improving the coal loading capacity of the shearer.

[0017] When a shearer is mining coal underground, the random variability of the coal seam on the working face is relatively large, which easily causes large vibrations of the shearer during coal mining. By using the support assembly of the present application, part of the vibrations of the shearer can be absorbed by the oil cylinder structure therein, which can extend the service life of the shearer, especially the service life of the shearer, and thus improve the working reliability of the shearer. Brief Description of the Drawings

[0018] Figure 1 is a perspective view of an embodiment of the present invention;

[0019] Figure 2 is Figure 1 the front view of

[0020] Figure 3 is Figure 2 the A-A stepped sectional view of

[0021] Reference numerals: 1. Pin shaft assembly; 2. Two-way hydraulically controlled check valve; 3. Support seat; 4. First O-ring; 5. Guide sleeve; 6. Second O-ring; 7. Piston; 8. Leg; 9. Pin shaft; 10. Slide shoe. Detailed Description of the Invention

[0022] The present invention discloses an adjustable-height shearer support assembly (hereinafter referred to as the support assembly). As Figures 1-3 shown, it includes a slide shoe 10, a support seat assembly and a leg assembly. The lower part of the leg assembly is hinged to the slide shoe through a pin shaft 9, and the lower part of the support seat assembly is inserted into the upper groove of the leg assembly to form an oil cylinder structure that can be telescopically extended up and down. By adjusting the telescopic amount of the oil cylinder structure, the height of the support assembly can be changed. When the slide shoe is worn more, as long as the telescopic amount of the oil cylinder structure is adjusted according to the measured wear amount of the slide shoe to extend the corresponding height, the height of the support assembly can be kept the same as that when the slide shoe is not worn, so that the shearer can maintain parallel coal mining, the service time of the slide shoe can be extended, and the service life of the support assembly can be improved. When there is an undulating working face, especially a downhill mining working face, the influence of the downhill mining working face can be reduced or eliminated by adjusting the telescopic amount of the oil cylinder structure, thereby improving the coal loading capacity of the shearer. In addition, by providing the oil cylinder structure, part of the vibrations of the shearer can also be absorbed, so the service life of the shearer drum is extended.

[0023] The outrigger assembly may include an outrigger 8 and a guide sleeve 5. A groove is provided at the top of the outrigger. The groove includes an upper rectangular groove and a lower circular groove. An internal thread is provided at the upper part of the circular groove. The guide sleeve is threadedly connected to the upper part within the circular groove with its external thread. The so-called rectangle and circle refer to the cross-sectional shapes at the corresponding positions of the outrigger. Other polygonal grooves may also be provided at the position of the rectangular groove.

[0024] The support base assembly may include a support base 3 and a piston 7. The middle and lower parts of the support base are respectively formed into rod-shaped structures with rectangular cross-sections and circular cross-sections. An external thread is provided at the lower section of the rod-shaped structure with the circular cross-section. The piston is threadedly sleeved outside the lower section of the rod-shaped structure with the circular cross-section with its internal thread.

[0025] Preferably, the depth of the upper rectangular groove is less than the distance between the guide sleeve and the piston in the installed state.

[0026] The piston slides up and down in cooperation with the lower part of the circular groove within the circular groove, and the two are sealed by an O-ring. The upper section of the rod-shaped structure with the circular cross-section slides up and down in cooperation with the guide sleeve within the guide sleeve, and the two are sealed by an O-ring. The rod-shaped structure with the rectangular cross-section is located within the rectangular groove and slides up and down in cooperation with the rectangular groove. The space below the guide sleeve within the circular groove constitutes the oil cylinder cavity of the oil cylinder structure. The piston slides up and down in this oil cylinder cavity driven by the support base. The oil cylinder cavities above and below the piston are respectively the upper cavity and the lower cavity. When the piston moves down to the bottom limit position of the circular groove, there is an upper and lower interval between the piston and the guide sleeve, and the oil cylinder cavity corresponding to this interval is the chamber when the upper cavity is at its maximum.

[0027] During assembly, the guide sleeve 5 can be first sleeved on the rod-shaped structure with the circular cross-section of the support base 3, then the piston 7 can be tightened on the lower section of the rod-shaped structure with the circular cross-section of the support base 3, and then the rod-shaped structure part of the support base 3 with the guide sleeve 5 and the piston 7 is inserted into the circular groove of the outrigger 8. At the same time, the support base 3 is rotated to threadedly connect the guide sleeve to the outrigger.

[0028] The support leg 8 can be made into a split structure, for example, including a support leg body and four side panels, the four side panels are fixedly mounted on the top surface of the support leg body, and are surrounded by a rectangle from four sides to form the upper rectangular groove. In this case, the piston 7 can also be placed in the bottom of the circular groove of the support leg first, and then the guide sleeve 5 is tightened on the upper part of the circular groove of the support leg, and the support seat 3 is inserted and rotated so that the piston 7 is threadedly connected with the lower section of the rod-shaped structure of the circular cross section of the support seat 3, and finally the four side panels are installed. Alternatively, the guide sleeve 5 can also be firstly sleeved on the upper section of the rod-shaped structure of the circular cross section of the support seat 3, and then the piston 7 is screwed on the lower section of the rod-shaped structure of the circular cross section of the support seat 3, and the support seat 3 with the guide sleeve 5 and the piston 7 is inserted into the circular groove of the support leg 8, and the support seat 3 is rotated at the same time so that the guide sleeve 5 is threadedly connected with the upper section of the circular groove of the support leg 8, and finally the four side panels are installed.

[0029] In the embodiment shown in the attached drawings, two oil holes are provided in the support seat, one end of the two oil holes is opened on the top surface of the support seat, and the other end of the two oil holes is opened on the bottom surface of the support seat, and the other end is opened on the outer cylindrical surface of the rod-shaped structure of the circular cross section of the support seat, which is located above the piston, and when the piston moves down to the bottom limit position of the circular groove, it is located below the guide sleeve. Through the alternating oil inlet and oil return of these two oil holes, the oil cylinder structure can be freely extended and retracted up and down to achieve the adjustment of the height of the support assembly.

[0030] Furthermore, the end of the oil hole provided on the outer cylindrical surface of the rod-shaped structure with a circular cross-section of the support seat is preferably located immediately above the top surface of the piston.

[0031] The height-adjustable coal mining machine support assembly can also include a two-way hydraulically controlled one-way valve 2, which can be installed on the middle top surface of the support seat, and the ends of the two oil holes opened on the top surface of the support seat are respectively connected to the two oil outlets of the two-way hydraulically controlled one-way valve, and the two oil inlets of the two-way hydraulically controlled one-way valve are connected to the pressure oil source and the return oil tank through a reversing valve. Through the reversing operation of the reversing valve, the two one-way valves in the two-way hydraulically controlled one-way valve alternately feed oil, so that the two oil holes alternately feed oil and return oil. The reversing valve adopts a three-position four-way reversing valve. When the reversing valve is switched to the middle position, the cylinder structure can stay at any position within the stroke.

[0032] The pressure oil source and return oil tank both adopt the pressure oil source and return oil tank of the coal mining machine system, and are respectively connected to the P port and O port of the reversing valve through the oil supply pipeline and return oil pipeline of the coal mining machine system, which saves the configuration of the hydraulic station and facilitates the centralized control of each valve.

[0033] The stroke of the oil cylinder structure is preferably no greater than 20 cm.

[0034] On the outer cylindrical surface of the piston, two O-ring mounting grooves can be provided at intervals in the vertical direction, and a second O-ring 6 is installed therein to seal between the piston and the lower part of the circular groove. On the inner cylindrical surface of the guide sleeve, two O-ring mounting grooves can be provided at intervals in the vertical direction, and a first O-ring 4 is installed therein to seal between the upper section of the rod-shaped structure with a circular cross-section and the guide sleeve.

[0035] The adjustable-height shearer support assembly preferably further includes two overflow valves, which are respectively connected to the two one-way valves in the two-way hydraulic control one-way valve. The specific connection method is as follows: for each overflow valve, its oil inlet is connected to the oil outlet of one of the one-way valves in the two-way hydraulic control one-way valve, and its oil outlet is connected to the oil inlet of the other one-way valve in the two-way hydraulic control one-way valve. The overflow valve can be integrally installed with the two-way hydraulic control one-way valve. The setting of the overflow valve enables the cylinder structure to withstand the ordinary impact of the shearer. When the impact exceeds the set pressure of the overflow valve, it can be unloaded through this overflow valve, thereby reducing the rigid vibration of the shearer.

[0036] In this embodiment, the lower part of the leg is provided with a through groove structure with an opening facing downwards. The leg straddles the ear part of the sliding shoe by using this through groove and is hinged through the pin shaft 9, so as to realize the hinged connection between the leg assembly and the sliding shoe.

[0037] On the upper part of the support base, a pin shaft assembly 1 is installed on each of the left and right sides for connecting the support base to the fuselage of the shearer.

Claims

1. An adjustable-height support assembly for a coal mining machine, comprising a sliding shoe, characterized in that: The cam is an axially rotatable hydraulic cylinder structure, and the cam is adapted to engage with the guide rails of the hydraulic cylinder to engage with the guide rails in a manner that allows the cams to move relative to the guide rails. The two are sealed by an O-ring, the upper section of the rod-shaped structure with a circular cross-section is slidably matched with the guide sleeve up and down in the guide sleeve, and the two are sealed by an O-ring, the rod-shaped structure with a rectangular cross-section is located in the rectangular groove and is slidably matched with the rectangular groove up and down, and when the piston moves down to the bottom limit position of the circular groove, there is an upper and lower gap between the piston and the guide sleeve; two oil holes are provided in the support seat, one end of the two oil holes is opened on the top surface of the support seat, and the other ends of the two oil holes are opened on the bottom surface of the support seat, and the other end is opened on the outer cylindrical surface of the rod-shaped structure with a circular cross-section of the support seat and is located above the piston, and when the piston moves down to the bottom limit position of the circular groove, it is located below the guide sleeve; the depth of the upper rectangular groove is less than the distance between the guide sleeve and the piston in the installed state.

2. The adjustable-height shearer support assembly according to claim 1, wherein: The end of the oil hole formed on the outer cylindrical surface of the rod-shaped structure with a circular cross section of the support seat is located just above the top surface of the piston.

3. The adjustable-height shearer support assembly according to claim 2, characterized in that: It also includes a two-way hydraulically controlled one-way valve, which is installed on the support seat. Two oil holes are opened at the ends of the top surface of the support seat and are respectively connected to the two oil outlets of the two-way hydraulically controlled one-way valve. The two oil inlets of the two-way hydraulically controlled one-way valve are connected to the pressure oil source and the return oil tank through a reversing valve.

4. The adjustable-height shearer support assembly according to claim 3, wherein: The pressure oil source and the return oil tank are both provided by the coal mining machine system, and are connected to the reversing valve via the oil supply pipeline and the return oil pipeline provided by the coal mining machine system.

5. The adjustable-height shearer support assembly according to claim 3, characterized in that: The stroke of the oil cylinder structure is no more than 20 cm.

6. The adjustable-height shearer support assembly according to claim 3, characterized in that: Two O-ring mounting grooves are provided at intervals in the upper and lower parts on the outer cylindrical surface of the piston, in which O-rings are installed to seal between the piston and the lower part of the circular groove; two O-ring mounting grooves are provided at intervals in the upper and lower parts on the inner cylindrical surface of the guide sleeve, in which O-rings are installed to seal between the upper section of the rod-shaped structure with a circular cross-section and the guide sleeve.

7. The adjustable-height shearer support assembly according to claim 3, 4, 5 or 6, characterized in that: It further includes two overflow valves which are respectively connected to the two one-way valves in the two-way hydraulically controlled one-way valve. The specific connection mode is as follows: for each of the overflow valves, its oil inlet is connected to the oil outlet of one of the one-way valves in the two-way hydraulically controlled one-way valve, and its oil outlet is connected to the oil inlet of the other one-way valve in the two-way hydraulically controlled one-way valve.

8. The adjustable-height shearer support assembly according to claim 7, characterized in that: The lower part of the outrigger straddle rides on the ear part of the slider and is hinged through the pin shaft.

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