Large-height-adjusting-ratio three-telescopic stand column and hydraulic support

Abstract

The utility model discloses a three-telescopic stand column with a large height adjustment ratio and a hydraulic support, the stand column comprises a first-stage cylinder body, a second-stage cylinder body, a third-stage cylinder body and a piston column which are arranged in a sliding and sealing mode, a control valve seat and a column descending liquid inlet connector are arranged on the outer side of the first-stage cylinder body, a first hydraulic control valve is arranged on the bottom wall of the second-stage cylinder body, and a second hydraulic control valve is arranged on the bottom wall of the third-stage cylinder body; a first blind hole is formed in the lower end face of the piston column, a supporting rod is arranged in the first blind hole, a second blind hole is formed in the upper end face of the supporting rod, and a flow guide channel is formed in the lower portion of the second blind hole and communicated with an inner cavity of the first blind hole. The outer peripheral face of the upper end of the supporting rod is provided with an annular table, the outer peripheral face of the annular table is in sealing sliding fit with the inner peripheral face of the first blind hole, and the lower end of the supporting rod is sleeved with a piston fixedly connected with the piston column. Therefore, the stand column is the three-telescopic stand column with the large height adjusting ratio, the problem that coal mining is difficult to achieve due to the fact that the thickness of a coal mine is large is solved, the lifting height difference of the hydraulic support is large in change, and the actual use requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic supports, in particular to a three-telescopic column with a large height adjustment ratio and a hydraulic support. Background Art

[0002] As the key bearing component of hydraulic support, the performance of the column directly determines the mining efficiency of the coal mining face. The hydraulic support columns used in the fully-mechanized mining face of coal mines mainly include single telescopic columns, single telescopic mechanical extension rod columns, and double telescopic columns. Among them, the double telescopic column has the largest telescopic ratio and can meet the mining conditions of most coal mines; however, there are also a few areas where the thickness of coal seams changes frequently, especially when there are faults that need to be passed through the fully-mechanized mining area, which requires a larger lifting range of the hydraulic support. The support height of the support is determined by the height adjustment range of the column. Ordinary double telescopic columns can no longer meet the requirements of a large ratio between the maximum support height and the minimum support height of the hydraulic support. Therefore, it is imperative to develop a three-telescopic column with a larger telescopic ratio to meet market demand. Utility Model Content

[0003] In view of the above-mentioned deficiencies, the technical problem to be solved by the utility model is: to provide a three-telescopic column and a hydraulic support with a large height adjustment ratio, which can be applied to coal seams with thick deposits and difficult to mine in coal mines. The telescopic column of the utility model makes the lifting height difference of the hydraulic support vary greatly, thus meeting the use requirements.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A three-stage telescopic column with a large height adjustment ratio comprises a primary cylinder, a secondary cylinder sealingly and slidably arranged inside the primary cylinder, a tertiary cylinder sealingly and slidably arranged inside the secondary cylinder, and a piston column sealingly and slidably arranged inside the tertiary cylinder;

[0006] The outer side of the first-stage cylinder body is respectively provided with a control valve seat and a descending column liquid inlet joint, and the descending column liquid inlet joint is communicated with the upper chamber of the first-stage cylinder body;

[0007] A first hydraulically controlled valve is arranged on the bottom wall of the secondary cylinder body, and the first hydraulically controlled valve connects the lower chamber of the primary cylinder body with the lower chamber of the secondary cylinder body; a secondary flow channel is longitudinally opened in the side wall of the secondary cylinder body, and the secondary flow channel connects the upper chamber of the primary cylinder body with the upper chamber of the secondary cylinder body;

[0008] A second hydraulically controlled valve is arranged on the bottom wall of the three-stage cylinder body, and the second hydraulically controlled valve connects the lower chamber of the two-stage cylinder body with the lower chamber of the three-stage cylinder body; a three-stage flow channel is opened in the side wall of the three-stage cylinder body, and the three-stage flow channel connects the upper chamber of the two-stage cylinder body with the upper chamber of the three-stage cylinder body;

[0009] A first blind hole is axially formed on the lower end surface of the piston column, a support rod is coaxially provided in the first blind hole, a second blind hole is axially formed on the upper end surface of the support rod, a flow guide channel is radially formed on the lower part of the second blind hole, and the flow guide channel is communicated with the inner cavity of the first blind hole;

[0010] The outer circumference of the upper end of the support rod is provided with a ring platform, and the outer circumference of the ring platform is sealingly slidably matched with the inner circumference of the first blind hole. The outer circumference of the lower end of the support rod is sealingly slidably sleeved with a piston, and the piston is fixedly connected to the piston column.

[0011] Preferably, the ring platform and the support rod are forged into an integral structure.

[0012] Preferably, the first-stage cylinder body, the second-stage cylinder body and the third-stage cylinder body are integrally forged.

[0013] Preferably, the first-stage cylinder body and the second-stage cylinder body are sealed and slidably arranged via a first guide sleeve; the second-stage cylinder body and the third-stage cylinder body are sealed and slidably arranged via a second guide sleeve; and / or; the third-stage cylinder body and the piston rod are sealed and slidably arranged via a third guide sleeve.

[0014] A hydraulic support comprises the above-mentioned three telescopic columns with large height adjustment ratio.

[0015] After adopting the above technical solution, the beneficial effects of the utility model are:

[0016] Due to the large height adjustment ratio three-telescopic column and hydraulic support of the utility model, the telescopic column includes a first-level cylinder body, a second-level cylinder body, a third-level cylinder body and a piston column arranged in sequence from the outside to the inside, and the first-level cylinder body, the second-level cylinder body, the third-level cylinder body and the piston column are slidingly sealed and connected, a control valve seat and a lowering column liquid inlet joint are arranged on the outer side of the first-level cylinder body, a first hydraulic control valve is arranged on the bottom wall of the second-level cylinder body, and a second hydraulic control valve is arranged on the bottom wall of the third-level cylinder body; a first blind hole is axially provided on the lower end surface of the piston column, a support rod is arranged in the coaxial gap in the first blind hole, a second blind hole is axially provided on the upper end surface of the support rod, a guide channel is radially provided on the lower part of the second blind hole, and the guide channel is communicated with the inner cavity of the first blind hole; an annular platform is provided on the outer circumferential surface of the upper end of the support rod, and the outer circumferential surface of the annular platform is sealingly and slidingly matched with the inner circumferential surface of the first blind hole, a piston is sealingly and slidingly sleeved on the outer circumferential surface of the lower end of the support rod, and the piston is fixedly connected to the piston column. It can be seen that the column of the utility model is a three-telescopic column with a large height adjustment ratio, which solves the problem of difficult-to-mine coal seams with large thickness in coal mines, makes the lifting height difference of the hydraulic support vary greatly, and meets actual use needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of three telescopic columns with large height adjustment ratio in the utility model;

[0018] Figure 2 yes Figure 1 Cross-section view in the AA direction;

[0019] Figure 3 This is the dimensioning diagram of the three telescopic columns with large height adjustment ratio in the utility model;

[0020] In the figure: 1-first-stage cylinder body, 11-control valve seat, 12-down column liquid inlet joint, 2-second-stage cylinder body, 21-secondary flow channel, 22-first hydraulic control valve, 3-third-stage cylinder body, 31-third-stage flow channel, 32-second hydraulic control valve, 4-piston column, 41-first blind hole, 5-support rod, 51-second blind hole, 52-guide channel, 53-ring platform, 6-piston, 7-fourth pressure-bearing chamber, 80-first guide sleeve, 81-second guide sleeve, 82-third guide sleeve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0023] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0024] Embodiment 1:

[0025] like Figure 1 and Figure 2As shown, a three-stage telescopic column with a large height adjustment ratio includes a primary cylinder body 1, a secondary cylinder body 2 sealed and slidably arranged inside the primary cylinder body 1, a tertiary cylinder body 3 sealed and slidably arranged inside the secondary cylinder body 2, and a piston column 4 sealed and slidably arranged inside the tertiary cylinder body 3. In a preferred embodiment, the primary cylinder body 1, the secondary cylinder body 2 and the tertiary cylinder body 3 are integrally forged to reduce the amount of welding and improve the overall structural strength. In this embodiment, the primary cylinder body 1 and the secondary cylinder body 2 are sealed and slidably arranged through the first guide sleeve 80; the secondary cylinder body 2 and the tertiary cylinder body 3 are sealed and slidably arranged through the second guide sleeve 81; and / or; the tertiary cylinder body 3 and the piston column 4 are sealed and slidably arranged through the third guide sleeve 82.

[0026] A control valve seat 11 and a descending column liquid inlet joint 12 are respectively provided on the outer side of the first-stage cylinder body 1 , and the descending column liquid inlet joint 12 is communicated with the upper chamber of the first-stage cylinder body 1 .

[0027] A first hydraulically controlled valve 22 is provided on the bottom wall of the secondary cylinder body 2, and the first hydraulically controlled valve 22 connects the lower chamber of the primary cylinder body 1 with the lower chamber of the secondary cylinder body 2; a secondary flow channel 21 is longitudinally opened in the side wall of the secondary cylinder body 2, and the secondary flow channel 21 connects the upper chamber of the primary cylinder body 1 with the upper chamber of the secondary cylinder body 2.

[0028] A second hydraulic control valve 32 is arranged on the bottom wall of the tertiary cylinder body 3, and the second hydraulic control valve 32 connects the lower chamber of the secondary cylinder body 2 with the lower chamber of the tertiary cylinder body 3; a tertiary flow channel 31 is opened in the side wall of the tertiary cylinder body 3, and the tertiary flow channel 31 connects the upper chamber of the secondary cylinder body 2 with the upper chamber of the tertiary cylinder body 3.

[0029] A first blind hole 41 is axially opened on the lower end face of the piston column 4, a support rod 5 is coaxially gapped in the first blind hole 41, a second blind hole 51 is axially opened on the upper end face of the support rod 5, a guide channel 52 is radially opened on the lower part of the second blind hole 51, and the guide channel 52 is communicated with the inner cavity of the first blind hole 41.

[0030] The outer circumference of the upper end of the support rod 5 is provided with a ring platform 53, and the outer circumference of the ring platform 53 is sealingly slidably matched with the inner circumference of the first blind hole 41. The outer circumference of the lower end of the support rod 5 is sealingly slidably sleeved with a piston 6, and the piston 6 is fixedly connected to the piston column 4. In a preferred embodiment, the ring platform 53 and the support rod 5 are processed into an integrated structure by forging.

[0031] The working principle of the utility model is:

[0032] like Figure 1 and Figure 2As shown, when the column is raised: the emulsion enters the lower cavity of the first-stage cylinder body 1 through the control valve seat 11 on the outer wall of the first-stage cylinder body 1, pushes the second-stage cylinder body 2 to drive the third-stage cylinder body 3 and the piston rod 4 to rise together, the second-stage cylinder body 2 rises to the highest position and stops, the first hydraulic control valve 22 opens, the emulsion enters the lower cavity of the second-stage cylinder body 2, pushes the third-stage cylinder body 3 to drive the piston rod 4 to rise together, the third-stage cylinder body 3 rises to the highest position and stops, the second hydraulic control valve 32 opens, the emulsion enters the lower cavity of the third-stage cylinder body 3, pushes the piston rod 4 to rise, the piston rod 4 rises to the highest position and stops, and the entire column rising process ends.

[0033] It should be emphasized that: the support rod 5 is stationary during the rising process of the piston column 4, so the emulsion entering the lower chamber of the three-stage cylinder body 3 enters the second blind hole 51 through the guide channel 52, and the emulsion reaches the fourth pressure-bearing chamber 7 at the top of the first blind hole 41 through the second blind hole 51, that is, the pressure of the lower chamber of the three-stage cylinder body 3 is transmitted to the fourth pressure-bearing chamber 7 of the piston column 4, which is equivalent to increasing the pressure-bearing area of ​​the lower chamber of the three-stage cylinder body 3, thereby reducing the pressure borne by the lower chamber of the three-stage cylinder body 3; at the same time, when the telescopic column is subjected to an impact load, the emulsions in the fourth pressure-bearing chamber 7 at the top of the three-stage cylinder body 3 and the piston column 4 both play a buffering role, effectively reducing the hydraulic elastic coefficient of the entire column, prolonging the impact action time, and significantly enhancing the impact resistance of the column.

[0034] like Figure 1 and Figure 2 As shown, when the column is lowered: the emulsion enters the upper cavity of the first-stage cylinder body 1 through the column lowering liquid inlet joint 12 on the outer wall of the first-stage cylinder body 1, and the lower cavity of the first-stage cylinder body 1 returns liquid. At this time, the first hydraulic control valve 22 and the second hydraulic control valve 32 are both in a closed state, and the emulsion pushes the second-stage cylinder body 2 to drive the tertiary cylinder body 3 and the piston column 4 to descend. When the second-stage cylinder body 2 drops to the bottom position, the first hydraulic control valve 22 opens, and the emulsion pushes the tertiary cylinder body 3 and the piston column 4 to descend together. When the tertiary cylinder body 3 drops to the bottom position, the second hydraulic control valve 32 opens, and the emulsion pushes the piston column 4 to descend, and the entire column lowering process ends.

[0035] To sum up, the column of the utility model is a three-telescopic column with a large height adjustment ratio, which solves the problem of difficult-to-mine coal seams with large thickness in coal mines, makes the lifting height difference of the hydraulic support vary greatly, meets actual use needs, and has a simple structure, low cost and easy implementation.

[0036] like Figure 3 As shown, in order to meet the design requirements of the column and achieve equal pressure in each chamber, other conditions need to be met. Therefore, the inner diameter and wall thickness of each cylinder can be optimized to meet actual needs.

[0037] D1 is the outer diameter of the first-stage cylinder body, D2 is the inner diameter of the first-stage cylinder body, D3 is the outer diameter of the second-stage cylinder body, D4 is the inner diameter of the second-stage cylinder body, D4 is the outer diameter of the third-stage cylinder body, D5 is the inner diameter of the third-stage cylinder body, D6 is the piston diameter, D7 is the piston column diameter, and D8 is the support rod diameter.

[0038] The specific values ​​are: D1=φ520mm, D2=φ450mm, D3=φ425mm, D4=φ360mm, D5=φ340mm, D6=φ250mm, D7=φ235mm, D8=φ90mm.

[0039] Embodiment 2:

[0040] A hydraulic support comprises the above-mentioned three telescopic columns with large height adjustment ratio.

[0041] The hydraulic support of the utility model uses the three telescopic columns with a large height adjustment ratio as described in the first embodiment, so that it can be applied to coal seams with large thickness and difficult to mine, thus meeting the use requirements.

[0042] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modifications made within the spirit and principles of the utility model, improvements of the three telescopic columns and hydraulic supports with a large height adjustment ratio, etc., should be included in the protection scope of the utility model.

Claims

1. A three-telescopic column with a large height adjustment ratio, characterized in that: It comprises a primary cylinder, a secondary cylinder sealingly and slidably arranged inside the primary cylinder, a tertiary cylinder sealingly and slidably arranged inside the secondary cylinder, and a piston rod sealingly and slidably arranged inside the tertiary cylinder; The outer side of the first-stage cylinder body is respectively provided with a control valve seat and a descending column liquid inlet joint, and the descending column liquid inlet joint is communicated with the upper chamber of the first-stage cylinder body; A first hydraulically controlled valve is arranged on the bottom wall of the secondary cylinder body, and the first hydraulically controlled valve connects the lower chamber of the primary cylinder body with the lower chamber of the secondary cylinder body; a secondary flow channel is longitudinally opened in the side wall of the secondary cylinder body, and the secondary flow channel connects the upper chamber of the primary cylinder body with the upper chamber of the secondary cylinder body; A second hydraulically controlled valve is arranged on the bottom wall of the three-stage cylinder body, and the second hydraulically controlled valve connects the lower chamber of the two-stage cylinder body with the lower chamber of the three-stage cylinder body; a three-stage flow channel is opened in the side wall of the three-stage cylinder body, and the three-stage flow channel connects the upper chamber of the two-stage cylinder body with the upper chamber of the three-stage cylinder body; A first blind hole is axially formed on the lower end surface of the piston column, a support rod is coaxially provided in the first blind hole, a second blind hole is axially formed on the upper end surface of the support rod, a flow guide channel is radially formed on the lower part of the second blind hole, and the flow guide channel is communicated with the inner cavity of the first blind hole; The outer circumference of the upper end of the support rod is provided with a ring platform, and the outer circumference of the ring platform is sealingly slidably matched with the inner circumference of the first blind hole. The outer circumference of the lower end of the support rod is sealingly slidably sleeved with a piston, and the piston is fixedly connected to the piston column.

2. The three-telescopic column with large height adjustment ratio according to claim 1 is characterized in that: The ring platform and the support rod are processed into an integrated structure through forging.

3. The three-telescopic column with large height adjustment ratio according to claim 1 is characterized in that: The primary cylinder body, the secondary cylinder body and the tertiary cylinder body are integrally forged.

4. The three-telescopic column with large height adjustment ratio according to claim 1 is characterized in that: The first-stage cylinder body and the second-stage cylinder body are arranged to slide in a sealed manner via a first guide sleeve; The secondary cylinder body and the tertiary cylinder body are arranged to slide in a sealed manner via a second guide sleeve; and / or; The three-stage cylinder body and the piston rod are arranged in sealing and sliding manner through a third guide sleeve.

5. A hydraulic support, characterized in that: It comprises the three telescopic columns with large height adjustment ratio as described in any one of claims 1 to 4.

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