Two-column shield hydraulic support

Abstract

The application provides a two-column shield type hydraulic support, relates to the technical field of hydraulic supports for coal mine working faces, and comprises a base, a stand column, a top beam, a driving rod, a first traction rod, a second traction rod and a rhombus unit. The size of the stand column in the height direction is adjustable, and the base extends along a first direction. The driving rod, the first traction rod and the second traction rod are all pivotally connected with the base, the pivot axes of each of the driving rod, the first traction rod and the second traction rod at the base are in the same horizontal plane and all extend along a second direction. The rhombus unit comprises four unit rods which are sequentially pivotally connected and form a closed rhombus, and the rhombus unit has a first pivot axis, a second pivot axis, a third pivot axis and a fourth pivot axis which are sequentially distributed in a rhombus shape. The application can make the top beam linearly ascend and descend when the working height is adjusted, reduces the horizontal swing range of the beam end running track, ensures that the beam end can move along a relatively accurate linear track, and effectively improves the use stability of the hydraulic support during work.

Description

Technical Field

[0001] This application relates to the field of hydraulic support technology for coal mine working faces, and in particular to a two-column shield hydraulic support. Background Technology

[0002] Hydraulic supports are the core equipment of fully mechanized mining faces, and their quality directly affects the quality of the mining face. Among them, the two-column shield hydraulic support has advantages such as column strength, better physical state of integration with the roof, ability to adjust the position of the top beam's combined force, and being more suitable for the needs of high-yield and high-efficiency development, and its usage ratio in hydraulic supports has been increasing year by year.

[0003] The core and challenge of designing a two-column shield hydraulic support lies in its four-bar structure. The quality of its design and optimization directly impacts the performance of the two-column shield hydraulic support. The key to optimizing the four-bar structure is reducing the horizontal swing of the beam-end trajectory. The closer the beam-end trajectory is to a straight line (i.e., the smaller the horizontal swing), the more stable the hydraulic support. Ideally, the hydraulic support is most stable when the trajectory is a straight line. In related technologies, the beam-end trajectory optimized for the four-bar structure of hydraulic supports is often an approximate straight line obtained from a double kink, failing to achieve a truly straight trajectory. This reduces the stability of the two-column shield hydraulic support during operation in fully mechanized mining faces. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a two-column shield hydraulic support, which enables the top beam to rise and fall linearly when adjusting the working height, greatly reducing the horizontal swing of the beam end's running trajectory and ensuring that the beam end can move along a relatively precise straight trajectory, thereby effectively improving the stability of the hydraulic support during operation.

[0006] A two-column shield hydraulic support according to an embodiment of the present invention includes a base, columns, a top beam, a drive rod, a first traction rod, a second traction rod, and a rhomboid unit.

[0007] The lower end of the column is connected to the base, the upper end of the column is pivotally connected to the top beam, the column is adjustable in height, and the base extends along a first direction.

[0008] The drive rod, the first traction rod, and the second traction rod are all pivotally connected to the base. The pivot axes of each of the drive rod, the first traction rod, and the second traction rod at the base are on the same horizontal plane and all extend along the second direction. The second direction, the first direction, and the height direction are mutually perpendicular. The pivot axes of the first traction rod and the second traction rod at the base are collinear.

[0009] The rhomboid unit comprises four unit rods that are pivotally connected in sequence to form a closed rhombus. The rhomboid unit has a first pivot axis, a second pivot axis, a third pivot axis, and a fourth pivot axis that are distributed in a rhomboid pattern in sequence. The portions of the first traction rod and the second traction rod that are away from the base are pivotally connected to the rhomboid unit around the first pivot axis and the third pivot axis, respectively. The portion of the drive rod that is away from the base is pivotally connected to the rhomboid unit around the second pivot axis. The top beam is pivotally connected to the rhomboid unit around the fourth pivot axis. The distance between the pivot axes of the drive rod and the first traction rod at the base is equal to the distance between the pivot axis of the drive rod at the base and the second pivot axis. The distance between the pivot axis of the first traction rod at the base and the first pivot axis is equal to the distance between the pivot axis of the second traction rod at the base and the third pivot axis.

[0010] According to an embodiment of the present invention, the two-column shield hydraulic support consists of a drive rod, a first traction rod, a second traction rod, and a rhomboid unit, forming a Procellie linkage mechanism. Compared to the related art where the column is paired with a four-bar linkage, resulting in an approximate straight line obtained by a double kink, the column in this application, paired with the Procellie linkage mechanism, ensures that the top beam moves linearly when the column adjusts the position of the top beam along the height direction. This greatly reduces the horizontal swing of the beam's trajectory and ensures that the beam end can move along a relatively precise straight line, effectively improving the stability of the hydraulic support during operation.

[0011] In some embodiments, the two-column shield hydraulic support further includes a balance drive, which is pivotally connected to the base, and the output end of the balance drive is driven and pivotally connected to the drive rod.

[0012] In some embodiments, the four unit rods are of equal length and are connected by pivoting from end to end in sequence.

[0013] In some embodiments, the first traction rod and the second traction rod are located on the same side of the rhomboid unit along the second direction;

[0014] Alternatively, the first traction rod and the second traction rod may be respectively located on both sides of the rhomboid unit along the second direction.

[0015] In some embodiments, there are two first traction rods and two second traction rods, with the two first traction rods respectively disposed on opposite sides of the rhomboid unit along the second direction, and the two second traction rods respectively disposed on opposite sides of the rhomboid unit along the second direction.

[0016] In some embodiments, the lengths of the first traction rod and the second traction rod are equal.

[0017] In some embodiments, the distance between the pivot axis of the drive rod at the base and the first pivot axis is less than the distance between the pivot axis of the drive rod at the base and the third pivot axis;

[0018] The two-column shield hydraulic support also includes a first tilt sensor, which is connected to the unit rod located between the third pivot axis and the fourth pivot axis. The first tilt sensor is used to detect the tilt angle of the unit rod located between the third pivot axis and the fourth pivot axis relative to the top beam.

[0019] In some embodiments, the two-column shield hydraulic support further includes a second tilt sensor, which is disposed on the column and used to detect the tilt angle of the column relative to the top beam.

[0020] In some embodiments, the base includes a first base and a second base arranged correspondingly along the second direction. The first base and the second base are connected and respectively connected to the lower end of one of the columns. The drive rod, the first traction rod, the second traction rod and the balance drive are all pivotally connected between the first base and the second base.

[0021] In some embodiments, the inner sides of the first seat and the inner sides of the second seat are respectively provided with first main stiffening plates, and the drive rod, the first traction rod, the second traction rod and the balance drive are all connected between the two first main stiffening plates by pins.

[0022] In some embodiments, at least two second main stiffening plates are provided on the lower surface of the top beam, both the second main stiffening plates and the first main stiffening plate extending along the first direction, and at least two second main stiffening plates are pivotally connected to the rhombic unit about the fourth pivot axis by pins.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a two-column shield hydraulic support according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the connection structure of the drive rod, first traction rod, second traction rod, diamond unit, and balance drive in a two-column shield hydraulic support according to an embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the rhomboid unit in the two-column shield hydraulic support according to an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram of the connection structure of the first traction rod and the second traction rod in a two-column shield hydraulic support according to an embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the base structure in a two-column shield hydraulic support according to an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the top beam in a two-column shield hydraulic support according to an embodiment of the present invention.

[0030] Figure 7 This is a structural schematic diagram of the two-column shield hydraulic support in posture one according to an embodiment of the present invention.

[0031] Figure 8 This is a structural schematic diagram of the two-column shield hydraulic support in posture two according to an embodiment of the present invention.

[0032] Figure 9 This is a structural schematic diagram of the two-column shield hydraulic support in posture three according to an embodiment of the present invention.

[0033] Figure 10 This is a graph showing the relationship between the displacement of the front end of the top beam along the first direction and time in a two-column shield hydraulic support according to an embodiment of the present invention. The vertical axis of the graph represents the displacement of the front end of the top beam along the first direction in millimeters, and the horizontal axis represents time in seconds.

[0034] Reference numerals: 1. Base; 11. First main stiffening plate; 2. Column; 3. Top beam; 31. Second main stiffening plate; 4. Drive rod; 5. First traction rod; 6. Second traction rod; 7. Rhomboid unit; 71. Unit rod; 72. First pivot axis; 73. Second pivot axis; 74. Third pivot axis; 75. Fourth pivot axis; 8. Balance drive; 9. First tilt sensor; 91. Second tilt sensor. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] like Figure 1 As shown, a two-column shield hydraulic support according to an embodiment of the present invention includes a base 1, a column 2, a top beam 3, a drive rod 4, a first traction rod 5, a second traction rod 6, and a rhomboid unit 7.

[0037] The lower end of the column 2 is connected to the base 1, and the upper end of the column 2 is pivotally connected to the top beam 3. The column 2 is adjustable in height, and the base 1 extends along the first direction.

[0038] Among them, the drive rod 4, the first traction rod 5 and the second traction rod 6 are all pivotally connected to the base 1. The pivot axis of each of the drive rod 4, the first traction rod 5 and the second traction rod 6 at the base 1 is on the same horizontal plane and extends along the second direction. The second direction, the first direction and the height direction are perpendicular to each other. The pivot axis of the first traction rod 5 and the second traction rod 6 at the base 1 is collinear.

[0039] like Figures 1 to 4 As shown in the figure, the rhomboid unit 7 includes four unit rods 71 ​​that are pivotally connected in sequence to form a closed rhombus. The rhomboid unit 7 has a first pivot axis 72, a second pivot axis 73, a third pivot axis 74, and a fourth pivot axis 75 that are distributed in a rhomboid pattern in sequence. The portions of the first traction rod 5 and the second traction rod 6 that are away from the base 1 are pivotally connected to the rhomboid unit 7 around the first pivot axis 72 and the third pivot axis 74, respectively. The portion of the drive rod 4 that is away from the base 1 is pivotally connected to the rhomboid unit 7 around the second pivot axis 73. The top beam 3 is pivotally connected to the rhomboid unit 7 around the fourth pivot axis 75. The distance between the pivot axes of the drive rod 4 and the first traction rod 5 at the base 1 is equal to the distance between the pivot axis of the drive rod 4 at the base 1 and the second pivot axis 73. The distance between the pivot axis of the first traction rod 5 at the base 1 and the first pivot axis 72 is equal to the distance between the pivot axis of the second traction rod 6 at the base 1 and the third pivot axis 74.

[0040] According to an embodiment of the present invention, the two-column shield hydraulic support is formed by the cooperation of the drive rod 4, the first traction rod 5, the second traction rod 6 and the rhomboid unit 7, which constitutes the Percelli linkage mechanism. Compared with the related technology in which the column 2 is cooperated with the four-bar linkage mechanism and the beam end running trajectory is an approximately straight line obtained by the double hindrance, the column 2 in this application cooperates with the Percelli linkage mechanism to ensure that the top beam 3 rises and falls in a straight line when the column 2 adjusts the position of the top beam 3 in the height direction. This greatly reduces the horizontal swing of the beam end running trajectory and ensures that the beam end can move along a relatively accurate straight trajectory, effectively improving the stability of the hydraulic support during operation.

[0041] It should be noted that in the Persellier linkage mechanism, the running trajectory of the free end of the rhombic unit 7 (i.e., the vertex end of the corner of the rhombic unit 7 that is not hinged to other rods) is a relatively precise straight line. Therefore, when the column 2 adjusts the position of the top beam 3 along the height direction, since the free end of the rhombic unit 7 is pivotally connected to the top beam 3 of the hydraulic support (i.e., in this application, the top beam 3 is pivotally connected to the rhombic unit 7 around the fourth pivot axis 75), the drive rod 4, the first traction rod 5, and the second traction rod 6 are all pivotally connected to the base 1. The Posselier linkage mechanism formed in this part moves synchronously with and restrains the column 2, so that the top beam 3 rises and falls in a straight line, so as to avoid the horizontal component movement (i.e., horizontal swing) in the running trajectory of the beam end. This ensures that after the height of the hydraulic support is adjusted, the top beam 3 is in a horizontal state in the working position (i.e., if only the column 2 or the Posselier linkage mechanism moves and restricts the movement of the other, it will cause the top beam 3 to tilt upward or downward). This ensures the stable support performance of the hydraulic support when working in the fully mechanized mining face.

[0042] Specifically, the drive rod 4, the first traction rod 5, and the second traction rod 6 are all pivotally connected to the base 1 via pins. The four unit rods 71 ​​can also be pivotally connected in pairs via pins. Furthermore, the drive rod 4, the first traction rod 5, and the second traction rod 6 can all be pivotally connected to the pins at the corresponding pivot axes of the rhomboid unit 7 via a common pin.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, the two-column shield hydraulic support also includes a balance drive 8, which is pivotally connected to the base 1, and the output end of the balance drive 8 is driven and pivotally connected to the drive rod 4.

[0044] The balance drive 8 pulls the drive rod 4 to rotate, causing the first traction rod 5 and the second traction rod 6 to swing, thereby deforming the rhomboid unit 7 and actively cooperating with the column 2 to realize the linear lifting and lowering action of the top beam 3. This further reduces the problem that when the balance drive 8 is not used, the drive rod 4, the first traction rod 5, the second traction rod 6 and the rhomboid unit 7 can only cooperate with the column 2 and cannot be adjusted independently to ensure the levelness of the top beam 3.

[0045] Specifically, the balance drive 8 can be a balance jack. The base of the balance jack can be pivotally connected to the base 1 via a pin, and its piston rod can be pivotally connected to the drive rod 4 via a pin. In actual use, the balance jack can also lock the position of the drive rod 4 after the height of the top beam 3 is adjusted to the correct position, thereby limiting the positions of the first traction rod 5, the second traction rod 6, and the rhomboid unit 7. Compared with locking the position of the top beam 3 only by the column 2, the use of the balance drive 8 also improves the support stability of the top beam 3 during operation.

[0046] like Figure 3 As shown, in some embodiments, the four unit rods 71 ​​are of equal length and are connected by pivoting from end to end in sequence.

[0047] like Figure 1 and Figure 2 As shown, in some embodiments, the first traction rod 5 and the second traction rod 6 are located on the same side of the rhomboid unit 7 along the second direction.

[0048] Alternatively, the first traction rod 5 and the second traction rod 6 are respectively located on both sides of the rhomboid unit 7 along the second direction.

[0049] like Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, there are two first traction rods 5 and two second traction rods 6. The two first traction rods 5 are respectively disposed on opposite sides of the rhomboid unit 7 along the second direction, and the two second traction rods 6 are respectively disposed on opposite sides of the rhomboid unit 7 along the second direction.

[0050] The use of two first traction rods 5 and second traction rods 6 can, in conjunction with the drive rod 4, traction the rhomboid unit 7 to deform in order to meet the usage requirements, while improving the traction reliability of the rhomboid unit 7 and ensuring the overall structural strength and support stability.

[0051] like Figure 4 As shown, in some embodiments, the length of the first traction rod 5 and the length of the second traction rod 6 are equal.

[0052] like Figures 1 to 3 As shown, in some embodiments, the distance between the pivot axis of the drive rod 4 at the base 1 and the first pivot axis 72 is less than the distance between the pivot axis of the drive rod 4 at the base 1 and the third pivot axis 74.

[0053] The two-column shield hydraulic support also includes a first tilt sensor 9, which is connected to a unit rod 71 located between the third pivot axis 74 and the fourth pivot axis 75. The first tilt sensor 9 is used to detect the tilt angle of the unit rod 71 located between the third pivot axis 74 and the fourth pivot axis 75 relative to the top beam 3.

[0054] The angle between the unit rod 71 and the top beam 3 is detected by the first tilt sensor 9 to avoid interference between the unit rod 71 and the top beam 3 when the hydraulic support is in a low working state, thereby reducing the damage to the unit rod 71 and the top beam 3.

[0055] Specifically, the first tilt sensor 9 is installed on the side wall of the unit rod 71 closest to the top beam 3. Since this position is the first to contact the top beam 3 when working in a low position, the positional relationship between this position and the top beam 3 is directly monitored to prevent interference problems, which is highly operable.

[0056] like Figure 1 As shown, in some embodiments, the two-column shield hydraulic support also includes a second tilt sensor 91, which is disposed on the column 2 and used to detect the tilt angle of the column 2 relative to the top beam 3.

[0057] The first tilt sensor 9 and the second tilt sensor 91 respectively collect the tilt angle data of their respective components relative to the top beam 3. By analyzing the aforementioned data, the extension or contraction of the balancing jack is adjusted to ensure the levelness of the top beam 3.

[0058] Specifically, the second tilt sensor 91 is fixed on the cylinder of the column 2. The use of the first tilt sensor 9 and the second tilt sensor 91 further improves the adjustment accuracy of the horizontality of the top beam 3 during the operation of the hydraulic support.

[0059] like Figure 1 and Figure 5 As shown, in some embodiments, the base 1 includes a first base body and a second base body arranged correspondingly along the second direction. The first base body and the second base body are connected and respectively connected to the lower end of a column 2. The drive rod 4, the first traction rod 5, the second traction rod 6 and the balance drive 8 are all pivotally connected between the first base body and the second base body.

[0060] The first support body, the second support body, and the two columns 2 ensure the support strength of the top beam 3. The placement of the drive rod 4, the first traction rod 5, the second traction rod 6, and the balance drive 8 between the first and second support bodies further improves the structural stability of the hydraulic support and reduces the possibility of deflection during the lifting and lowering of the top beam 3.

[0061] like Figure 1 and Figure 5 As shown, in some embodiments, the inner side of the first seat and the inner side of the second seat are respectively provided with first main stiffening plates 11, and the drive rod 4, the first traction rod 5, the second traction rod 6 and the balance drive 8 are all connected between the two first main stiffening plates 11 by pins.

[0062] like Figure 1 , Figure 5 and Figure 6 As shown, in some embodiments, at least two second main stiffening plates 31 are provided on the lower surface of the top beam 3. The second main stiffening plates 31 and the first main stiffening plates 11 both extend along the first direction. The at least two second main stiffening plates 31 are pivotally connected to the rhomboid unit 7 about the fourth pivot axis 75 by pins.

[0063] The first main stiffening plate 11 and the second main stiffening plate 31 can respectively ensure the structural strength of the base 1 and the top beam 3, while realizing the connection between the drive rod 4, the first traction rod 5, the second traction rod 6, the balance drive 8 and the rhomboid unit 7 between the base 1 and the top beam 3.

[0064] Preferably, in order to improve the stability of the vertical lifting of the top beam 3 when the hydraulic support is working, the upper ends of the two columns 2 can be pivotally connected to the top beam 3 at the positions on both sides of the center line of the lower surface of the top beam 3 along the first direction. The drive rod 4, the first traction rod 5, the second traction rod 6 and the balance drive 8 are all pivotally connected to the middle position of the two bases 1 along the first direction. The rhomboid unit 7 is pivotally connected to the position of the lower surface of the top beam 3 along the center line of the first direction around the fourth pivot axis 75.

[0065] The working method of this two-column shield-type hydraulic support is explained below, based on its specific structure. When the working height of the hydraulic support needs to be increased, column 2 extends. To maintain the levelness of the top beam 3, the balance jack retracts, causing the drive rod 4 to rotate backward around its pivot axis at the base 1, pulling the second pivot axis 73 downward. At this time, with the assistance of the first traction rod 5 and the second traction rod 6, the rhomboid unit 7 is stretched along the height direction. The top beam 3 is pushed upward with the cooperation of column 2 and rhomboid unit 7, thus raising the top beam 3. Conversely, when the working height of the hydraulic support needs to be decreased, column 2 retracts. To maintain the levelness of the top beam 3, the balance jack extends, and other components move accordingly, similar to the aforementioned process for increasing the working height of the hydraulic support.

[0066] In addition, during the lifting or lowering of the top beam 3, the balancing jack can be adjusted accordingly based on the data detected by the first tilt sensor 9 and the second tilt sensor 91 to keep the top beam 3 horizontal.

[0067] It is understandable that the three attitudes of the two-column shield hydraulic support in this application are realized as follows:

[0068] like Figure 7 As shown in posture one, the hydraulic support is at its lowest working height. At this time, the unit rod 71 with the first tilt sensor 9 installed is almost in contact with the top beam 3. The contact point is at the first tilt sensor 9. The angle between the first traction rod 5 and the base 1 reaches its minimum value. The angle between the second traction rod 6 and the base 1 does not change much and is always within a reasonable angle range. The angle between the two unit rods 71 ​​pivoted around the fourth pivot axis 75, the angle between the two unit rods 71 ​​pivoted around the second pivot axis 73, and the angle between the first traction rod 5 and the second traction rod 6 all reach their maximum values.

[0069] like Figure 8As shown in posture two, the hydraulic support is in the working state between the highest and lowest positions. As the column 2 extends and the top beam 3 rises, the included angle between the two unit rods 71 ​​pivoted around the fourth pivot axis 75, the included angle between the two unit rods 71 ​​pivoted around the second pivot axis 73, and the included angle between the first traction rod 5 and the second traction rod 6 all gradually decrease.

[0070] like Figure 9 As shown in posture three, the hydraulic support is at its highest working height. At this time, the column 2 reaches its maximum elongation, the distance between the first pivot axis 72 and the third pivot axis 74 reaches its minimum value, and the included angle between the two unit rods 71 ​​pivotally connected around the fourth pivot axis 75, the included angle between the two unit rods 71 ​​pivotally connected around the second pivot axis 73, and the included angle between the first traction rod 5 and the second traction rod 6 all reach their minimum values.

[0071] like Figure 10 As shown, it should be noted that, given the errors in the model, the front end of the top beam 3 only experienced a displacement of about 1.4 mm along the first direction.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A two-column shield-type hydraulic support, characterized in that, include: The base, the column, and the top beam are provided. The lower end of the column is connected to the base, and the upper end of the column is pivotally connected to the top beam. The column is adjustable in height, and the base extends along a first direction. The driving rod, the first traction rod, and the second traction rod are all pivotally connected to the base. The pivot axes of each of the driving rod, the first traction rod, and the second traction rod at the base are in the same horizontal plane and all extend along a second direction. The second direction, the first direction, and the height direction are mutually perpendicular. The pivot axes of the first traction rod and the second traction rod at the base are collinear. as well as A rhomboid unit comprises four unit rods pivotally connected in sequence to form a closed rhombus. The rhomboid unit has a first pivot axis, a second pivot axis, a third pivot axis, and a fourth pivot axis arranged in a rhomboid pattern. The portions of the first traction rod and the second traction rod facing away from the base are pivotally connected to the rhomboid unit around the first pivot axis and the third pivot axis, respectively. The portion of the drive rod facing away from the base is pivotally connected to the rhomboid unit around the second pivot axis. The top beam is pivotally connected to the rhomboid unit around the fourth pivot axis. The distance between the pivot axes of the drive rod and the first traction rod at the base is equal to the distance between the pivot axis of the drive rod at the base and the second pivot axis. The distance between the pivot axis of the first traction rod at the base and the first pivot axis is equal to the distance between the pivot axis of the second traction rod at the base and the third pivot axis.

2. The two-column shield-type hydraulic support according to claim 1, characterized in that, The two-column shield hydraulic support also includes a balance drive, which is pivotally connected to the base, and the output end of the balance drive is driven and pivotally connected to the drive rod.

3. The two-column shield-type hydraulic support according to claim 1, characterized in that, The four unit rods are of equal length and are connected by pivoting from end to end in sequence.

4. The two-column shield hydraulic support according to any one of claims 1-3, characterized in that, The first traction rod and the second traction rod are located on the same side of the rhomboid unit along the second direction; Alternatively, the first traction rod and the second traction rod may be respectively located on both sides of the rhomboid unit along the second direction.

5. The two-column shield-type hydraulic support according to claim 4, characterized in that, There are two first traction rods and two second traction rods. The two first traction rods are respectively located on opposite sides of the rhomboid unit along the second direction, and the two second traction rods are respectively located on opposite sides of the rhomboid unit along the second direction.

6. The two-column shield-type hydraulic support according to claim 1, characterized in that, The distance between the pivot axis of the drive rod at the base and the first pivot axis is less than the distance between the pivot axis of the drive rod at the base and the third pivot axis; The two-column shield hydraulic support also includes a first tilt sensor, which is connected to the unit rod located between the third pivot axis and the fourth pivot axis. The first tilt sensor is used to detect the tilt angle of the unit rod located between the third pivot axis and the fourth pivot axis relative to the top beam.

7. The two-column shield-type hydraulic support according to claim 6, characterized in that, The two-column shield hydraulic support also includes a second tilt sensor, which is located on the column and used to detect the tilt angle of the column relative to the top beam.

8. The two-column shield-type hydraulic support according to claim 2, characterized in that, The base includes a first base and a second base arranged correspondingly along the second direction. The first base and the second base are connected and respectively connected to the lower end of one of the columns. The drive rod, the first traction rod, the second traction rod and the balance drive are all pivotally connected between the first base and the second base.

9. The two-column shield-type hydraulic support according to claim 8, characterized in that, The inner sides of the first seat and the inner sides of the second seat are respectively provided with first main stiffening plates. The driving rod, the first traction rod, the second traction rod and the balance drive are all connected between the two first main stiffening plates by pins.

10. The two-column shield-type hydraulic support according to claim 9, characterized in that, At least two second main stiffening plates are provided on the lower surface of the top beam. Both the second main stiffening plates and the first main stiffening plate extend along the first direction. At least two second main stiffening plates are pivotally connected to the rhomboid unit around the fourth pivot axis via pins.

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