Large-height-adjustment-ratio mechanical lengthened piston rod three-telescopic stand column and hydraulic support

Abstract

The utility model discloses a large height adjustment ratio mechanical lengthened piston rod three-telescopic stand column and a hydraulic support, the stand column comprises a first-stage cylinder body, a second-stage cylinder body and a third-stage cylinder body, the mechanical lengthened piston rod is arranged in the third-stage cylinder body, and the mechanical lengthened piston rod is in threaded connection with the third-stage cylinder body; the three-stage cylinder further comprises a reinforcing clamping sleeve, the reinforcing clamping sleeve is arranged on the outer side of the mechanical lengthened piston rod in a sleeving mode, one end of the reinforcing clamping sleeve is fixed to the three-stage cylinder body, the other end of the reinforcing clamping sleeve is fixed to the outer end of the mechanical lengthened piston rod, and the reinforcing clamping sleeve is in threaded connection with the mechanical lengthened piston rod. When the mechanical lengthened piston rod goes deep into the third-stage cylinder body, column lifting is completed through bottom liquid inlet, and when the height adjusting ratio does not meet the use requirement, the mechanical lengthened piston rod can be screwed out of the third-stage cylinder body, and then a reinforcing clamping sleeve is additionally arranged. Therefore, the stand column has a large height adjusting ratio, so that the lifting height difference of the hydraulic support is greatly changed, and the requirement of a coal seam which is difficult to mine and has large thickness change in a thin coal mine can be 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 mechanically lengthened piston rod and a hydraulic support. Background Art

[0002] As the key load-bearing component of the 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 mechanically extended piston 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 a few areas where the thickness of the coal seams changes frequently, especially when there are faults that need to be passed through the fully-mechanized mining area. This requires the hydraulic support to have a larger lifting range, and 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 requirement of a large ratio between the highest support height and the lowest support height of the hydraulic support. Therefore, it is imperative to develop three telescopic columns with a larger telescopic ratio to meet market demand. Utility Model Content

[0003] In view of the above-mentioned shortcomings, the technical problem to be solved by the present invention is: to provide a three-telescopic column and a hydraulic support with a large height adjustment ratio and a mechanically lengthened piston rod. The column can increase the height adjustment ratio by mechanically lengthening the piston rod, so that the lifting height difference of the hydraulic support can vary greatly, thereby meeting the needs of difficult-to-mine coal seams such as thin coal mines with large thickness variations.

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

[0005] A column with a large telescopic ratio includes a first-stage cylinder body, a second-stage cylinder body sealingly and slidingly arranged on the inside of the first-stage cylinder body, and a third-stage cylinder body sealingly and slidingly arranged on the inside of the second-stage cylinder body. A mechanically extended piston rod is arranged in the third-stage cylinder body, an external rectangular thread is arranged on the mechanically extended piston rod, a first internal rectangular thread is arranged on the inner wall of the third-stage cylinder body, and the mechanically extended piston rod is threadedly connected to the third-stage cylinder body through the external rectangular thread and the first internal rectangular thread; it also includes a reinforcing sleeve, which is arranged on the outside of the mechanically extended piston rod, and one end of the reinforcing sleeve is fixed to the third-stage cylinder body, and the other end of the reinforcing sleeve is fixed to the outer end of the mechanically extended piston rod, the inner wall of the reinforcing sleeve is provided with a second internal rectangular thread, and the second internal rectangular thread is threadedly connected to the external rectangular thread.

[0006] Preferably, an operating hole is provided at the outer end of the mechanically lengthened piston rod.

[0007] Preferably, the reinforced ferrule includes a first ferrule and a second ferrule, and the first ferrule and the second ferrule are buckled together.

[0008] A preferred embodiment is that a first valve seat and a second valve seat are provided on the outer side of the first-stage cylinder body, a liquid inlet hole is provided on the first valve seat, and a liquid return hole is provided on the second valve seat; a long and deep liquid inlet hole is provided on the inner side of the first-stage cylinder body, the inlet of the long and deep liquid inlet hole passes through the outer wall of the first-stage cylinder body and is communicated with the liquid inlet hole, and the outlet of the long and deep liquid inlet hole is communicated with the lower cavity of the first-stage cylinder body to form a liquid inlet circuit; a long and deep liquid return hole is provided on the inner side of the second-stage cylinder body, the outlet of the long and deep liquid return hole passes through the outer wall of the first-stage cylinder body and is communicated with the liquid return hole, and the inlet of the long and deep liquid return hole is communicated with the hole at the cylinder mouth of the second-stage cylinder body to form a liquid return circuit.

[0009] Preferably, the first-stage cylinder and the second-stage cylinder are arranged to slide in a sealed manner via a first guide sleeve; and / or the second-stage cylinder and the third-stage cylinder are arranged to slide in a sealed manner via a second guide sleeve.

[0010] Preferably, a first outer guide ring is provided between the first-stage cylinder body and the second-stage cylinder body, and a second outer guide ring is provided between the second-stage cylinder body and the third-stage cylinder body; and / or a first inner guide ring is provided between the first guide sleeve and the second-stage cylinder body, and a second inner guide ring is provided between the second guide sleeve and the third-stage cylinder body.

[0011] A hydraulic support comprises the above-mentioned three telescopic columns with large height adjustment ratio and mechanically lengthened piston rod.

[0012] After adopting the above technical solution, the beneficial effects of the utility model are:

[0013] Due to the large height adjustment ratio mechanically extended piston rod three-telescopic column and hydraulic support of the utility model, the three-telescopic column includes a first-stage cylinder body, a second-stage cylinder body which is sealingly and slidingly arranged on the inside of the first-stage cylinder body, and a third-stage cylinder body which is sealingly and slidingly arranged on the inside of the second-stage cylinder body. A mechanically extended piston rod is arranged in the third-stage cylinder body, an external rectangular thread is arranged on the mechanically extended piston rod, a first internal rectangular thread is arranged on the inner wall of the third-stage cylinder body, and the mechanically extended piston rod is threadedly connected to the third-stage cylinder body through the external rectangular thread and the first internal rectangular thread; it also includes a reinforcing sleeve, which is arranged on the outside of the mechanically extended piston rod, and one end of the reinforcing sleeve is fixed to the third-stage cylinder body, and the other end of the reinforcing sleeve is fixed to the outer end of the mechanically extended piston rod, the inner wall of the reinforcing sleeve is provided with a second internal rectangular thread, and the second internal rectangular thread is threadedly connected to the external rectangular thread. In actual use, the mechanically extended piston rod extends deep into the three-stage cylinder. When a large height adjustment ratio is required, the mechanically extended piston rod is rotated out of the three-stage cylinder. After it is fully extended, a reinforcing sleeve is installed to increase the force resistance of the mechanically extended piston rod to meet the required use. As can be seen, the column of the utility model has a large height adjustment ratio, which allows the hydraulic support to have a large height difference. It can meet the large height adjustment ratio requirements of thin coal mines with large thickness variations and difficult to mine coal seams. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of three telescopic columns with a large height adjustment ratio and a mechanically lengthened piston rod;

[0015] Figure 2 This is a structural diagram of three telescopic columns with a large height adjustment ratio mechanically extended piston rod from another angle;

[0016] Figure 3 This is the main view of the three telescopic columns of the large height adjustment ratio mechanically lengthened piston rod in the utility model;

[0017] Figure 4 yes Figure 3 Cross-section view in the AA direction;

[0018] Figure 5 This is a cross-sectional view of the layout of the three telescopic columns with a large height adjustment ratio mechanically extended piston rod;

[0019] Figure 6 yes Figure 5 A magnified schematic diagram of point B in the middle;

[0020] In the figure: 1-first-stage cylinder body, 2-second-stage cylinder body, 3-third-stage cylinder body, 4-mechanically extended piston rod, 40-operating hole, 5-long deep hole for liquid return, 6-high-strength bolt, 7-long deep hole for liquid inlet, 8-liquid inlet hole, 9-liquid return hole, 10-first guide sleeve, 11-second guide sleeve, 12-first outer guide ring, 13-second outer guide ring, 14-first inner guide ring, 15-second inner guide ring, 16-reinforced sleeve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] Example 1:

[0023] like Figures 1 to 6 As shown together, a three-telescopic column with a large height adjustment ratio mechanically extended piston rod includes a first-stage cylinder body 1, a second-stage cylinder body 2 sealingly and slidingly arranged inside the first-stage cylinder body 1, and a third-stage cylinder body 3 sealingly and slidingly arranged inside the second-stage cylinder body 2. A mechanically extended piston rod 4 is arranged in the third-stage cylinder body 3, and the mechanically extended piston rod 4 is provided with an external rectangular thread. The inner wall of the third-stage cylinder body 3 is provided with a first internal rectangular thread, and the first internal rectangular thread is threadedly connected to the external rectangular thread to realize a threaded connection between the mechanically extended piston rod 4 and the third-stage cylinder body 3;

[0024] The column of the present invention also includes a reinforcing sleeve 16, which is sleeved on the outside of the mechanically extended piston rod 4, and one end of the reinforcing sleeve 16 is fixed to the three-stage cylinder body 3, and the other end of the reinforcing sleeve 16 is fixed to the outer end of the mechanically extended piston rod 4. In this embodiment, the reinforcing sleeve 16 is fixed to the three-stage cylinder body 3 and the mechanically extended piston rod 4 by a high-strength bolt 6; the inner wall of the reinforcing sleeve 16 is provided with a second inner rectangular thread, and the second inner rectangular thread is threadedly connected to the outer rectangular thread. In a preferred embodiment, the reinforcing sleeve 16 includes a first sleeve and a second sleeve, and the first sleeve and the second sleeve are buckled together; that is, the reinforcing sleeve 16 is a two-half structure, so that it can be installed from both sides of the mechanically extended piston rod 4, which is convenient to install.

[0025] In this embodiment, an operating hole 40 is provided at the outer end of the mechanically lengthened piston rod 4 , and the mechanically lengthened piston rod 4 can be rotated through the operating hole 40 , thereby simplifying the operation.

[0026] like Figure 5 As shown, a first valve seat and a second valve seat are provided on the outer side of the first-stage cylinder body 1, a liquid inlet hole 8 is provided on the first valve seat, and a liquid return hole 9 is provided on the second valve seat; a long and deep liquid inlet hole 7 is provided on the inner side of the first-stage cylinder body 1, the inlet of the long and deep liquid inlet hole 7 passes through the outer wall of the first-stage cylinder body 1 and is connected with the liquid inlet hole 8, and the outlet of the long and deep liquid inlet hole 7 is connected with the lower cavity of the first-stage cylinder body 1, forming a liquid inlet circuit; a long and deep liquid return hole 5 is provided on the inner side of the second-stage cylinder body 2, the outlet of the long and deep liquid return hole 5 passes through the outer wall of the first-stage cylinder body 1 and is connected with the liquid return hole 9, and the inlet of the long and deep liquid return hole 5 is connected with the hole at the cylinder mouth of the second-stage cylinder body 2, forming a liquid return circuit.

[0027] like Figure 5 As shown, the first and second cylinder bodies 1 and 2 are arranged in a sealed sliding manner via a first guide sleeve 10; and / or the second and third cylinder bodies 2 and 3 are arranged in a sealed sliding manner via a second guide sleeve 11. A first outer guide ring 12 is provided between the first and second cylinder bodies 1 and 2, and a second outer guide ring 13 is provided between the second and third cylinder bodies 2 and 3; and / or a first inner guide ring 14 is provided between the first guide sleeve 10 and the second cylinder body 2, and a second inner guide ring 15 is provided between the second guide sleeve 11 and the third cylinder body 3. Under the action of the guide sleeves and guide rings, both sealing performance and reliable movement are guaranteed.

[0028] When the present invention is actually used, when the height adjustment ratio does not change much, the mechanically extended piston rod 4 piston column penetrates into the three-stage cylinder body 3, and the column lifting is completed by liquid inlet from the bottom. The height adjustment ratio changes greatly, and when the column lifting is completed, it cannot meet the use requirements. The mechanically extended piston rod 4 can be screwed out of the three-stage cylinder body 3, and after it is extended into place, a reinforcing sleeve 16 with a rectangular threaded groove inside is installed. In order to prevent the reinforcing sleeve 16 from rotating and falling off, connecting holes are provided at the upper and lower ends of the reinforcing sleeve 16, and high-strength bolts 6 are installed in the upper and lower connecting holes to connect the mechanically extended piston rod 4 and the three-stage cylinder body 3; the reinforcing sleeve 16 is removed when not in use; the mechanically extended piston rod 4 is extended to the fourth stage, and its diameter is too small to meet the force requirements. The reinforcing sleeve 16 is used to increase its force resistance to meet the use requirements.

[0029] It can be seen that the column of the utility model utilizes a mechanically lengthened piston rod 4, which has a large height adjustment ratio, so that the lifting height difference of the hydraulic support varies greatly, which can meet the large height adjustment ratio requirements of difficult-to-mine coal seams such as thin coal mines with large thickness variations.

[0030] The working principle of this utility model is:

[0031] like Figures 1 to 6 As shown, when the column is raised: the emulsion enters the lower chamber of the first cylinder body 1 through the liquid inlet hole 8 and the long deep liquid inlet hole 7 on the first valve seat on the outer wall of the first cylinder body 1, pushing the second cylinder body 2, which in turn drives the third cylinder body 3 and the mechanical extension piston rod 4 to rise. The second cylinder body 2 rises to the highest position and stops. The hydraulic control valve opens, and the emulsion enters the lower chamber of the second cylinder body 2, pushing the third cylinder body 3 and the mechanical extension piston rod 4 to rise together. The third cylinder body 3 rises to the highest position and stops. Rotate the operating hole at the end of the mechanical extension piston rod 4 as needed to rotate and extend the mechanical extension piston rod 4. After it is extended to the right position, install the reinforcing sleeve 16, and the entire column raising process is completed.

[0032] Example 2:

[0033] A hydraulic support comprises the three telescopic columns with a large height adjustment ratio and a mechanically lengthened piston rod as described in the first embodiment.

[0034] The upright column used in the hydraulic support of the utility model has a large height adjustment wall, so that it can be applied to coal seams with thick deposits that are difficult to mine, thus meeting the use requirements.

[0035] The above-mentioned preferred embodiments of the present invention are only and are not intended to limit the present invention. Any modifications made within the spirit and principles of the present invention, including improvements such as a large height adjustment ratio mechanically lengthened piston rod, three telescopic columns, and a hydraulic support, shall be included in the scope of protection of the present invention.

Claims

1. A three-stage telescopic column with a large height adjustment ratio and a mechanically extended piston rod, comprising a primary cylinder, a secondary cylinder sealingly and slidingly arranged inside the primary cylinder, and a tertiary cylinder sealingly and slidingly arranged inside the secondary cylinder, characterized in that: A mechanically extended piston rod is provided in the three-stage cylinder body, and an external rectangular thread is provided on the mechanically extended piston rod. A first internal rectangular thread is provided on the inner wall of the three-stage cylinder body, and the mechanically extended piston rod is threadedly connected to the three-stage cylinder body through the external rectangular thread and the first internal rectangular thread: It also includes a reinforcing sleeve, which is arranged on the outside of the mechanically extended piston rod, and one end of the reinforcing sleeve is fixed to the three-stage cylinder body, and the other end of the reinforcing sleeve is fixed to the outer end of the mechanically extended piston rod. The inner wall of the reinforcing sleeve is provided with a second internal rectangular thread, and the second internal rectangular thread is threadedly connected to the external rectangular thread.

2. The three-telescopic column with large height adjustment ratio and mechanically lengthened piston rod according to claim 1 is characterized in that: An operating hole is provided at the outer end of the mechanically lengthened piston rod.

3. The three-telescopic column with large height adjustment ratio and mechanically lengthened piston rod according to claim 1 is characterized in that: The reinforced ferrule includes a first ferrule and a second ferrule, and the first ferrule and the second ferrule are buckled together.

4. The three-telescopic column with large height adjustment ratio and mechanically lengthened piston rod according to claim 1 is characterized in that: A first valve seat and a second valve seat are provided on the outer side of the first-stage cylinder body, the first valve seat is provided with a liquid inlet hole, and the second valve seat is provided with a liquid return hole; A long and deep liquid inlet hole is provided on the inner side of the first-stage cylinder body, the inlet of the long and deep liquid inlet hole passes through the outer wall of the first-stage cylinder body and is connected to the liquid inlet hole, and the outlet of the long and deep liquid inlet hole is connected to the lower cavity of the first-stage cylinder body, forming a liquid inlet circuit; A long and deep liquid return hole is provided on the inner side of the secondary cylinder body, the outlet of the long and deep liquid return hole passes through the outer wall of the primary cylinder body and is connected with the liquid return hole, and the inlet of the long and deep liquid return hole is connected with the hole at the cylinder mouth of the secondary cylinder body to form a liquid return circuit.

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

6. The three-telescopic column with large height adjustment ratio and mechanically lengthened piston rod according to claim 5 is characterized in that: A first outer guide ring is provided between the first-stage cylinder body and the second-stage cylinder body, and a second outer guide ring is provided between the second-stage cylinder body and the third-stage cylinder body; and / or a first inner guide ring is provided between the first guide sleeve and the second-stage cylinder body, and a second inner guide ring is provided between the second guide sleeve and the third-stage cylinder body.

7. A hydraulic support, characterized in that: It comprises the three telescopic columns with large height adjustment ratio and mechanically lengthened piston rod as described in any one of claims 1 to 6.

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