Double-telescopic stand column for hydraulic support

Abstract

The utility model discloses a double telescopic stand column for a hydraulic support, which belongs to the field of mining hydraulic supports and comprises an outer cylinder, a middle cylinder arranged inside the outer cylinder, a movable column body arranged inside the middle cylinder, a middle liquid pipe arranged inside the movable column body, a first liquid inlet channel arranged at the bottom of the outer cylinder and communicated with a lower cavity of the outer cylinder, and a second liquid inlet channel arranged at the bottom of the outer cylinder. A second liquid inlet channel is arranged on the upper portion of the outer cylinder and communicated with an upper cavity of the outer cylinder, a bottom valve is arranged at the bottom of the middle cylinder, protrusions are arranged at the bottom of the outer cylinder, a middle liquid pipe penetrates through the movable column body and then is connected with the middle cylinder, a flow guide channel is arranged at the bottom of the middle cylinder, and one end of the flow guide channel is communicated with the middle liquid pipe. The other end of the flow guide channel is communicated with the lower cavity of the outer cylinder, and a through hole is formed in the outer wall of the bottom of the plunger body. The middle liquid pipe is arranged in the movable column body, the structure is more compact, a liquid inlet pipe is prevented from being connected to the column head of the movable column body, and the double-telescopic stand column is more concise in structure and more convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of mine hydraulic support, especially a double telescopic stand column for hydraulic support. BACKGROUND

[0002] There are three forms of the conventional hydraulic support column used in coal mining: single telescopic stand column, single telescopic mechanical lengthening stand column and double telescopic stand column. The double telescopic stand column has the largest telescopic ratio and can meet the needs of most coal mines, so it is widely used. The existing double telescopic stand column usually has a liquid inlet on the head of the movable column body, and the liquid inlet is connected with a liquid inlet pipe to input liquid into the movable column body. Since the double telescopic stand column will be lifted during work, a very long liquid inlet pipe needs to be connected, which is connected to the outside of the double telescopic stand column, affecting the appearance and being not conducive to storage. If the liquid inlet pipe is accidentally touched during use, it will also affect the normal use of the double telescopic stand column. SUMMARY

[0003] The utility model discloses a double telescopic stand column for hydraulic support, which solves the problem that the existing double telescopic stand column usually has a liquid inlet connected to the head of the movable column body, affecting the appearance and being not conducive to storage, and if the liquid inlet pipe is accidentally touched during use, it will also affect the normal use of the double telescopic stand column.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] The utility model discloses a double telescopic stand column for hydraulic support, which solves the problem that the existing double telescopic stand column usually has a liquid inlet connected to the head of the movable column body, affecting the appearance and being not conducive to storage, and if the liquid inlet pipe is accidentally touched during use, it will also affect the normal use of the double telescopic stand column.

[0006] Further, the upper part of the outer cylinder and the middle cylinder, and the upper part of the middle cylinder and the movable column body are provided with a first sliding sealing assembly.

[0007] Further, the first sliding sealing assembly comprises a guide sleeve arranged inside the outer cylinder or the middle cylinder, an upper side of the guide sleeve is provided with a baffle sleeve, an upper side of the baffle sleeve is provided with a hole baffle ring, a first three half rings are arranged between the baffle sleeve and the inner wall of the outer cylinder and between the baffle sleeve and the inner wall of the middle cylinder, the first three half rings are in contact with the upper end surface of the guide sleeve, a first guide ring, a first baffle ring and a reed ring are arranged between the guide sleeve and the outer wall of the middle cylinder and between the guide sleeve and the outer wall of the active column body.

[0008] Further, a dustproof ring is arranged between the baffle sleeve and the outer wall of the middle cylinder and between the baffle sleeve and the outer wall of the active column body.

[0009] Further, the lower parts of the outer cylinder and the middle cylinder and the lower part of the middle cylinder and the active column body are all provided with a second sliding sealing assembly.

[0010] Further, the second sliding sealing assembly comprises a support ring arranged on the lower outer wall of the middle cylinder or the active column body, an outer side of the support ring is provided with an outer guide ring, an upper side of the support ring is provided with a clamping key, an upper side of the clamping key is provided with a piston guide ring and a drum ring.

[0011] Further, a third sliding sealing assembly is arranged between the bottom of the active column body and the middle liquid pipe.

[0012] Further, the third sliding sealing assembly comprises a second guide ring and a pull rod seal, the second guide ring and the pull rod seal are arranged in the mounting groove of the bottom of the active column body respectively, and the second guide ring is located on the upper side of the pull rod seal.

[0013] Further, a dumbbell ring is arranged between the middle cylinder and the middle liquid pipe.

[0014] Further, the bottom of the middle cylinder is provided with a mounting cavity, a limiting seat is arranged in the mounting cavity, the bottom of the middle liquid pipe extends into the mounting cavity and is in contact with the top surface of the limiting seat, an O-shaped ring and a second baffle ring are arranged between the limiting seat and the inner wall of the mounting cavity, the inside of the limiting seat is provided with a connecting channel, one end of the connecting channel is in communication with the middle liquid pipe, and the other end of the connecting channel is in communication with the flow guide channel.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0016] The utility model discloses the inside of active column body is provided with middle liquid pipe, and the structure is more compact, avoids connecting liquid inlet pipe on the column head of active column body, makes the structure of double telescopic stand more simple, and uses more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model is further described below in combination with the drawings.

[0018] Figure 1 It is the side view of the double telescopic stand column for hydraulic support of the utility model;

[0019] Figure 2 It is the sectional view of A-A direction of the double telescopic stand column for hydraulic support of the utility model;

[0020] Figure 3 It is the enlarged view of B in the middle; Figure 2

[0021] Figure 4 It is the enlarged view of C in the middle; Figure 2

[0022] Figure 5 It is the enlarged view of D in the middle; Figure 2

[0023] Figure 6 It is the enlarged view of E in the middle; Figure 2

[0024] Figure 7 It is the enlarged view of F in the middle; Figure 2

[0025] Figure 8 It is the sectional view of G-G direction of the double telescopic stand column for hydraulic support of the utility model.

[0026] Mark explanation: 1, outer cylinder, 1-1, first liquid inlet passage, 1-2, second liquid inlet passage, 1-3, protrusion, 2, middle cylinder, 2-1, flow guide passage, 3, movable column body, 3-1, through hole, 4, intermediate liquid pipe, 5, bottom valve, 6, hole check ring, 7, retaining sleeve, 8, guide sleeve, 9, first three half ring, 10, dustproof ring, 11, first check ring, 12, bud type ring, 13, first guide ring, 14, support ring, 15, clamping key, 16, piston guide ring, 17, drum ring, 18, outer guide ring, 19, second guide ring, 20, pull rod seal, 21, dumbbell ring, 22, O ring, 23, second check ring, 24, second three half ring, 25, pressure plate, 26, slotted countersunk screw, 27, limit seat, 27-1, connecting passage. Specific implementation

[0027] As Figures 1-8 ​​​​​As shown, a double telescopic column for a hydraulic support includes an outer cylinder 1. A middle cylinder 2 is slidably and sealed inside the outer cylinder 1. A movable column 3 is slidably and sealed inside the middle cylinder 2. An intermediate liquid pipe 4 is installed inside the movable column 3. A first liquid inlet channel 1-1 is connected to the bottom of the outer cylinder 1, communicating with the lower cavity of the outer cylinder 1. A second liquid inlet channel 1-2 is provided at the upper part of the outer cylinder 1, communicating with the upper cavity of the outer cylinder 1. A bottom valve 5 is installed at the bottom of the middle cylinder 2. When the bottom valve 5 is opened, the lower cavity of the outer cylinder 1 communicates with the lower cavity of the middle cylinder 2. The bottom of the outer cylinder 1 is connected to a protrusion 1-3 that matches the bottom valve 5. The intermediate liquid pipe 4 passes through the piston 3 and connects to the middle cylinder 2. The bottom of the middle cylinder 2 is provided with a flow guide channel 2-1. One end of the flow guide channel 2-1 is connected to the intermediate liquid pipe 4, and the other end of the flow guide channel 2-1 is connected to the lower cavity of the outer cylinder 1. The bottom outer wall of the piston 3 is provided with a through hole 3-1, which is connected to the upper cavity of the middle cylinder 2. The bottom valve 5 is a one-way valve. When the middle cylinder 2 descends to the lowest position, the protrusion 1-3 contacts the bottom valve 5 and pushes the bottom valve 5 open in the opposite direction, allowing the emulsion to flow back.

[0028] like Figure 2 As shown, the upper parts of the outer cylinder 1 and the middle cylinder 2, as well as the upper parts of the middle cylinder 2 and the piston 3, are all provided with first sliding sealing assemblies. Taking the first sliding sealing assembly on the upper part of the outer cylinder 1 and the middle cylinder 2 as an example, its specific structure is described below. Figure 3 As shown, the first sliding sealing assembly includes a guide sleeve 8, which is installed inside the outer cylinder 1. A retaining sleeve 7 is provided on the upper side of the guide sleeve 8, and a retaining ring 6 for the hole is provided on the upper side of the retaining sleeve 7. The retaining ring 6 for the hole limits the retaining sleeve 7. A first three-half ring 9 is installed between the retaining sleeve 7 and the inner wall of the outer cylinder 1. The first three-half ring 9 contacts the upper end face of the guide sleeve 8 and limits the guide sleeve 8. A first guide ring 13, a first retaining ring 11, and a lace ring 12 are installed between the guide sleeve 8 and the outer wall of the middle cylinder 2. A dustproof ring 10 is installed between the retaining sleeve 7 and the outer wall of the middle cylinder 2. The first sliding sealing assembly on the upper part of the middle cylinder 2 and the piston 3 has the same structure as the above structure, only the size is different.

[0029] The lower parts of the outer cylinder 1 and the middle cylinder 2, as well as the lower parts of the middle cylinder 2 and the piston 3, are all provided with second sliding sealing assemblies. Taking the second sliding sealing assembly installed at the lower part of the middle cylinder 2 and the piston 3 as an example, its specific structure is described below. Figure 4As shown, the second sliding sealing assembly includes a support ring 14, which is mounted on the lower outer wall of the piston 3. An outer guide ring 18 is mounted on the outer side of the support ring 14, and a retaining key 15 is mounted on the upper side of the support ring 14. A piston guide ring 16 and a drum-shaped ring 17 are mounted on the upper side of the retaining key 15. The second sliding sealing assembly at the lower part of the outer cylinder 1 and the middle cylinder 2 has the same structure as described above, except for the different dimensions.

[0030] A third sliding sealing assembly is installed between the bottom of the piston cylinder 3 and the intermediate liquid pipe 4. For example... Figure 5 As shown, the third sliding sealing assembly includes a second guide ring 19 and two pull rod seals 20. The second guide ring 19 and the pull rod seals 20 are respectively installed in the mounting groove at the bottom of the piston 3, and the second guide ring 19 is located on the upper side of the pull rod seal 20.

[0031] like Figure 6 As shown, a dumbbell ring 21 is installed between the middle cylinder 2 and the intermediate liquid pipe 4; the bottom of the middle cylinder 2 is provided with an installation cavity, and a limiting seat 27 is installed in the installation cavity. The bottom of the intermediate liquid pipe 4 extends into the installation cavity and contacts the top surface of the limiting seat 27. An O-ring 22 and a second retaining ring 23 are installed between the limiting seat 27 and the inner wall of the installation cavity. A connecting channel 27-1 is opened inside the limiting seat 27. One end of the connecting channel 27-1 is connected to the intermediate liquid pipe 4, and the other end of the connecting channel 27-1 is connected to the guide channel 2-1.

[0032] like Figure 7 As shown, the bottom valve 5 is installed at the bottom of the middle cylinder 2. The bottom of the bottom valve 5 is connected to the pressure plate 25 by a slotted countersunk screw 26. A second three-half ring 24 is installed between the pressure plate 25 and the bottom cavity of the middle cylinder 2.

[0033] The working principle of this utility model is as follows:

[0034] The column raising process: The emulsion enters the lower chamber of the outer cylinder 1 through the first inlet channel 1-1, pushing the middle cylinder 2 and the piston 3 to rise together; when the middle cylinder 2 reaches the highest position, it stops, at which point the bottom valve 5 opens, the emulsion enters the lower chamber of the middle cylinder 2, pushing the piston 3 to rise, and the piston 3 stops at the highest position, thus ending the entire telescopic column raising process.

[0035] The descending column process: the emulsion enters into the upper cavity of the outer cylinder 1 through the second liquid inlet channel 1-2, pushes the middle cylinder 2 to drive the movable column body 3 to descend, the emulsion in the lower cavity of the outer cylinder 1 is discharged through the first liquid inlet channel 1-1, when the middle cylinder 2 descends to the lowest position, the protrusion 1-3 contacts with the bottom valve 5 to open the bottom valve 5, then the emulsion enters into the flow guide channel 2-1, the emulsion enters into the intermediate liquid pipe 4 through the flow guide channel 2-1, and enters into the inside of the movable column body 3 through the opening at the top end of the intermediate liquid pipe 4, then communicates with the upper cavity of the middle cylinder 2 through the through hole 3-1 to push the movable column body 3 to descend, the emulsion in the lower cavity of the middle cylinder 2 is discharged from the first liquid inlet channel 1-1 through the bottom valve 5, the movable column body 3 stops descending at the lowest position, and the descending process of the telescopic column is completed.

[0036] The above-described embodiments are only used to describe the preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements of the technical scheme of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A double telescopic prop for hydraulic support, characterized in that: The outer cylinder (1) is internally provided with a middle cylinder (2), the middle cylinder (2) is internally provided with a movable cylinder (3), the movable cylinder (3) is internally provided with an intermediate liquid pipe (4), the bottom of the outer cylinder (1) is provided with a first liquid inlet channel (1-1), the first liquid inlet channel (1-1) is communicated with the lower cavity of the outer cylinder (1), the upper part of the outer cylinder (1) is provided with a second liquid inlet channel (1-2), the second liquid inlet channel (1-2) is communicated with the upper cavity of the outer cylinder (1), the bottom of the middle cylinder (2) is provided with a bottom valve (5), the lower cavity of the outer cylinder (1) is communicated with the lower cavity of the middle cylinder (2) after the bottom valve (5) is opened, the bottom of the outer cylinder (1) is provided with a protrusion (1-3) matched with the bottom valve (5), the intermediate liquid pipe (4) is connected with the middle cylinder (2) after penetrating through the movable cylinder (3), the bottom of the middle cylinder (2) is provided with a flow guide channel (2-1), one end of the flow guide channel (2-1) is communicated with the intermediate liquid pipe (4), the other end of the flow guide channel (2-1) is communicated with the lower cavity of the outer cylinder (1), the bottom outer wall of the movable cylinder (3) is provided with a through hole (3-1), the through hole (3-1) is communicated with the upper cavity of the middle cylinder (2).

2. The double telescopic prop according to claim 1, wherein: The upper part of the outer cylinder (1) and the middle cylinder (2), the upper part of the middle cylinder (2) and the movable cylinder (3) are provided with a first sliding sealing assembly.

3. The double telescopic prop according to claim 2, wherein: The first sliding sealing assembly comprises a guide sleeve (8), the guide sleeve (8) is arranged in the inner part of the outer cylinder (1) or the middle cylinder (2), the upper side of the guide sleeve (8) is provided with a blocking sleeve (7), the upper side of the blocking sleeve (7) is provided with a hole blocking ring (6), the first three half rings (9) are arranged between the blocking sleeve (7) and the inner wall of the outer cylinder (1), between the blocking sleeve (7) and the inner wall of the middle cylinder (2), the first three half rings (9) are in contact with the upper end surface of the guide sleeve (8), the first guide ring (13), the first blocking ring (11) and the lily type ring (12) are arranged between the guide sleeve (8) and the outer wall of the middle cylinder (2), between the guide sleeve (8) and the outer wall of the movable cylinder (3).

4. The double telescopic prop according to claim 3, wherein: The dustproof ring (10) is arranged between the blocking sleeve (7) and the outer wall of the middle cylinder (2), between the blocking sleeve (7) and the outer wall of the movable cylinder (3).

5. The hydraulic support double telescopic prop according to claim 1, characterized in that: The lower part of the outer cylinder (1) and the middle cylinder (2), the lower part of the middle cylinder (2) and the movable cylinder (3) are provided with a second sliding sealing assembly.

6. The double telescopic prop according to claim 5, wherein: The second sliding sealing assembly comprises a supporting ring (14), the supporting ring (14) is arranged on the lower outer wall of the middle cylinder (2) or the movable cylinder (3), the outer side of the supporting ring (14) is provided with an outer guide ring (18), the upper side of the supporting ring (14) is provided with a clamping key (15), the upper side of the clamping key (15) is provided with a piston guide ring (16) and a drum-shaped ring (17).

7. The hydraulic support double telescopic prop according to claim 1, characterized in that: The third sliding sealing assembly is arranged between the bottom of the movable cylinder (3) and the intermediate liquid pipe (4).

8. The double telescopic prop according to claim 7, characterized in that: The third sliding sealing assembly comprises a second guide ring (19) and a pull rod seal (20), which are arranged in mounting grooves at the bottom of the valve body (3), and the second guide ring (19) is located on the upper side of the pull rod seal (20).

9. The hydraulic support double telescopic prop according to claim 1, characterized in that: A dumbbell ring (21) is arranged between the middle cylinder (2) and the intermediate liquid pipe (4).

10. The hydraulic support double telescopic prop according to claim 1, characterized in that: The bottom of the middle cylinder (2) is provided with a mounting cavity, the mounting cavity is provided with a limiting seat (27), the bottom of the intermediate liquid pipe (4) extends into the mounting cavity and is in contact with the top surface of the limiting seat (27), an O-shaped ring (22) and a second stop ring (23) are arranged between the limiting seat (27) and the inner wall of the mounting cavity, the inside of the limiting seat (27) is provided with a connecting channel (27-1), one end of the connecting channel (27-1) is in communication with the intermediate liquid pipe (4), and the other end of the connecting channel (27-1) is in communication with the flow guide channel (2-1).

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