A hydraulic support with six-link mechanism

Abstract

The invention discloses a hydraulic support with a six-bar mechanism, comprising a front connecting rod (1), a rear connecting rod assembly, a shielding beam (3) and a base (4); the rear connecting rod assembly comprises a rear main connecting rod (21), a rear long branch connecting rod (22) and a rear short branch connecting rod (23); the lower end of the front connecting rod (1) is hinged to the base (4), and the upper end is hinged to the shielding beam (3); the lower end of the rear main connecting rod (21) is hinged to the base (4), and the upper end is coaxially hinged to the lower ends of the rear long branch connecting rod (22) and the rear short branch connecting rod (23); the upper end of the rear long branch connecting rod (22) is hinged to the shielding beam (3); the upper end of the rear short branch connecting rod (23) is hinged to the middle and upper part of the front connecting rod (1); the front connecting rod (1), the rear main connecting rod (21), the rear long branch connecting rod (22), the rear short branch connecting rod (23), the shielding beam (3) and the base (4) constitute a six-bar mechanism. When the bracket is at the maximum height, the horizontal angle between the rear link and the ground should be as small as possible to prevent the rear link from tipping forward; when the bracket is at the minimum height, the distance between the shielding beam and the ground should be as large as possible to prevent the shielding beam from touching the bottom.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical structures, and in particular to a hydraulic support with a six-link mechanism. Background Art

[0002] The hydraulic support in this article belongs to the fully mechanized mining equipment used in coal mines. It plays the role of surrounding rock support in the fully mechanized mining working face and provides a certain safety space for operators and other equipment.

[0003] The mainstream comprehensive mining hydraulic support structural parts on the market now usually consist of a top beam, a base, a shielding beam, and front and rear connecting rods, among which the shielding beam and the front and rear connecting rods constitute the four-bar mechanism of the hydraulic support.

[0004] In the early stage of development, the hydraulic supports for fully mechanized mining working faces were chop-type supports and joint-type supports without four-bar linkage. In 1961, the Soviet Union introduced a shield-type hydraulic support with a four-bar linkage. Since then, the four-bar linkage has shown strong vitality in hydraulic supports. Now the mainstream fully mechanized mining hydraulic supports, whether two-column or four-column, full-height mining or top coal caving, all have four-bar linkage.

[0005] The four-bar linkage is not only an important force transmission component in the hydraulic support, which can transmit the force of the top beam to the base through the four-bar linkage, but also an important stabilizing component, which effectively controls the distance between the beam end and the coal wall, so that the distance between the beam end and the coal wall remains basically unchanged when the support is raised or lowered, avoiding the coal mining machine cutting the beam head.

[0006] The hydraulic support with a four-bar linkage has certain limitations in the minimum and maximum ratios. If the thickness of the coal seam varies greatly, the hydraulic support will become incompatible when using three telescopic columns.

[0007] The hydraulic support structure of the prior art is as follows Figure 1 and 2 As shown, the four-link machine includes a front link 1, a rear link 2, a shield beam 3 and a base 4; the lower ends of the front link 1 and the rear link 2 are respectively hinged to the base 4, and the upper ends are respectively hinged to the shield beam 3. The shield beam 3 swings through the drive of the column hydraulic cylinder to form a relatively stable mechanism. Figure 1 In the case where the bracket is at its highest position (about 5200 mm), the horizontal angle between the bracket rear link 2 is about 70°, and the angle between the rear link 2 and the horizontal plane is large, which may cause the rear link 2 to tip forward. Figure 2 In the embodiment, when the support is at the lowest position (about 2200 mm), the support shielding beam 3 is about 62 mm from the ground. The distance between the shielding beam 3 and the ground is small, and there is a risk that the shielding beam 3 touches the bottom. Summary of the invention

[0008] The purpose of the present invention is to provide a hydraulic support with a six-link mechanism, so that when the support is at the maximum height, the horizontal angle between the rear connecting rod and the ground is as small as possible to prevent the rear connecting rod from tipping forward; when the support is at the minimum height, the distance between the shielding beam and the ground is as large as possible to prevent the shielding beam from touching the bottom.

[0009] The objective of the present invention is achieved through the following technical solutions:

[0010] A hydraulic support with a six-link mechanism, comprising a front link 1, a rear link assembly, a shield beam 3 and a base 4;

[0011] The rear connecting rod assembly includes a rear main connecting rod 21, a rear long connecting rod 22 and a rear short connecting rod 23;

[0012] The lower end of the front connecting rod 1 is hinged to the base 4, and the upper end is hinged to the shield beam 3;

[0013] The lower end of the rear main connecting rod 21 is hinged to the base 4, and the upper end is coaxially hinged to the lower ends of the rear long connecting rod 22 and the rear short connecting rod 23; the upper end of the rear long connecting rod 22 is hinged to the shield beam 3; the upper end of the rear short connecting rod 23 is hinged to the middle and upper part of the front connecting rod 1;

[0014] The front connecting rod 1, the rear main connecting rod 21, the rear long supporting connecting rod 22, the rear short supporting connecting rod 23, the shielding beam 3 and the base 4 form a six-bar mechanism.

[0015] The rear long connecting rods 22 include two connecting rods, which are arranged on both sides of the rear short connecting rods 23 .

[0016] The rear short connecting rods 23 include two connecting rods, which are arranged on both sides of the rear long connecting rod 22 .

[0017] It can be seen from the technical solution provided by the present invention that the hydraulic support with a six-link mechanism provided in the embodiment of the present invention makes the horizontal angle between the rear link and the ground as small as possible when the support is at the maximum height to prevent the rear link from tipping forward; and the distance between the shielding beam and the ground is as large as possible when the support is at the minimum height to prevent the shielding beam from touching the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the hydraulic support with a six-link mechanism in the prior art in the highest state;

[0020] Figure 2It is a schematic diagram of the lowest state structure of a hydraulic support with a six-link mechanism in the prior art;

[0021] Figure 3 A schematic diagram of the highest state structure of a hydraulic support with a six-link mechanism provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the lowest state structure of a hydraulic support with a six-link mechanism provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0024] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0025] Example

[0026] like Figure 3 and 4 As shown, this example is a hydraulic support with a six-bar mechanism, including a front connecting rod 1, a rear connecting rod assembly, a shielding beam 3 and a base 4; the rear connecting rod assembly includes a rear main connecting rod 21, a rear long supporting connecting rod 22 and a rear short supporting connecting rod 23; the lower end of the front connecting rod 1 is hinged to the base 4, and the upper end is hinged to the shielding beam 3; the lower end of the rear main connecting rod 21 is hinged to the base 4, and the upper end is coaxially hinged with the lower ends of the rear long supporting connecting rod 22 and the rear short supporting connecting rod 23; the upper end of the rear long supporting connecting rod 22 is hinged to the shielding beam 3; the upper end of the rear short supporting connecting rod 23 is hinged to the middle and upper part of the front connecting rod 1; the specific hinge position can be designed according to the needs of the structural design. At the same time, the length of each rod and the structure of the hydraulic support can be designed by yourself with reference to the hydraulic support of the prior art, and the specific requirements are not repeated here.

[0027] In this example, the rear long connecting rod 22 includes two, which are double connecting rods, and are arranged on both sides of the rear short connecting rod 23. Alternatively, the rear short connecting rod 23 includes two, which are double connecting rods, and are arranged on both sides of the rear long connecting rod 22.

[0028] The front connecting rod 1, the rear main connecting rod 21, the rear long supporting connecting rod 22, the rear short supporting connecting rod 23, the shielding beam 3 and the base 4 form a six-bar mechanism.

[0029] The six-bar mechanism is different from the four-bar mechanism, and its operating state is more complicated. However, through the six-bar mechanism, the highest and lowest ratios of the bracket can be adjusted higher. When the maximum height of the bracket is determined, the horizontal angle between the rear connecting rod of the bracket and the ground can be made smaller. For the same type of hydraulic bracket, when it is at the highest state of 5200mm, the horizontal angle between the rear main connecting rod 21 and the ground is 59°, reaching a smaller level to prevent tipping over. When the minimum height of the bracket is determined, the vertical distance between the bracket shielding beam 3 and the ground can be made larger. For the same type of hydraulic bracket, when it is at the lowest state of 2200mm, the vertical distance between the shielding beam 3 and the ground is 245mm, reaching a safer distance to prevent the shielding beam from touching the bottom.

[0030] It can be seen that if the hydraulic cylinder of the hydraulic support column adopts a three-telescopic form to improve the telescopic ratio, the hydraulic support with a six-link mechanism has better adaptability and increases the adaptability range of the support.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hydraulic support with a six-link mechanism, characterized in that: It comprises a front connecting rod (1), a rear connecting rod assembly, a shield beam (3) and a base (4); The rear connecting rod assembly comprises a rear main connecting rod (21), a rear long connecting rod (22) and a rear short connecting rod (23); The lower end of the front connecting rod (1) is hinged to the base (4), and the upper end is hinged to the shielding beam (3); The lower end of the rear main connecting rod (21) is hinged to the base (4), and the upper end is coaxially hinged to the lower ends of the rear long connecting rod (22) and the rear short connecting rod (23); the upper end of the rear long connecting rod (22) is hinged to the shield beam (3); the upper end of the rear short connecting rod (23) is hinged to the middle and upper part of the front connecting rod (1); The front connecting rod (1), the rear main connecting rod (21), the rear long connecting rod (22), the rear short connecting rod (23), the shielding beam (3) and the base (4) form a six-bar mechanism; The rear long connecting rod (22) comprises two connecting rods, which are arranged on both sides of the rear short connecting rod (23); or the rear short connecting rod (23) comprises two connecting rods, which are arranged on both sides of the rear long connecting rod (22).

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