Built-in energy absorption box type scour prevention stand column

Abstract

A plunger body extends into a cylinder body from the upper opening end of the cylinder body, a plunger piston is arranged at the lower end of the plunger body, a guide sleeve is installed between the plunger body and the inner wall of the cylinder body, an isolating ring with an open hole is arranged in an inner cavity of the cylinder body, and an energy absorption box is arranged in the inner cavity of the cylinder body. The isolating ring divides an inner cavity of the cylinder body into an upper cavity and a lower cavity which are communicated up and down, the energy absorption piece is arranged in the lower cavity, and a floating piston is arranged between the energy absorption piece and the isolating ring; the plunger body, the plunger piston and the guide sleeve are located in the upper cavity, the plunger piston divides the upper cavity into an annular cavity and a circular cavity which are not communicated through liquid, and the circular cavity is formed between the plunger piston and the isolating ring and communicated with a liquid inlet formed in the cylinder body; the lower end of the cylinder body is closed by arranging an end socket, the end socket is detachably fixed to the lower end of the cylinder body, and the lower end of the energy absorption piece is arranged at the upper end of the end socket. The energy absorption box is arranged in the bottom of the stand column cylinder body, and the height adaptability of the energy absorption anti-impact support can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal seam mining, in particular to a built-in energy-absorbing box-type anti-collision column, which is applied to an anti-collision support. Background Art

[0002] As the intensity and depth of coal mining continue to increase, many large mines have experienced rock bursts, which has become a disaster that seriously affects coal mine safety production. Rock bursts are characterized by short occurrence time, high intensity, and large energy release. In order to prevent and control rock bursts, since 2010, the team of Academician Pan Yishan has begun to study energy absorption and anti-impact technology, and has developed an energy-absorbing column with rapid absorption and concession functions. When used on the support, it can achieve a rapid pressure-absorption response to rock bursts, while absorbing impact energy and reducing the damage to the tunnel caused by the impact. After field application, it has achieved good anti-impact support effects. However, the energy absorber of the existing energy-absorbing and anti-impact column is set at the lower part of the hydraulic section of the column, such as Figure 1 As shown, the energy absorber is placed at the lower part of the cylinder body, and is composed of a guide rod 8, an energy absorbing piston 9, a sleeve 10 and an energy absorbing member 5. The energy absorbing piston 9 and the guide rod 8 are fixedly connected to the cylinder body 3. When the energy absorbing member 5 absorbs and gives way, the length L2 is reduced, and the guide rod 8 needs to move down the same distance, that is, the guide rod 8 gives way stroke L1 is reduced by the same distance. Therefore, for the axial size of the column, this type of energy absorber requires a displacement of 100mm at L1 and L2 to ensure a 100mm absorption and giving way stroke, and the overall non-hydraulic section size of the anti-collision column is larger. In addition, when the size of L2 is reduced, since the size of the hydraulic section of the anti-collision column remains unchanged, the overall maximum and minimum sizes of the anti-collision column are reduced accordingly, affecting the support height of the supporting equipment.

[0003] It can be seen that the installation length of the energy absorbing part and the compression stroke length of the energy absorbing part need to be set on the axial length of the column. Compared with the non-hydraulic section length of the ordinary column, the increase is much greater, which affects the stroke of the hydraulic column and reduces the adaptability of the energy absorbing bracket in the height direction. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a built-in energy absorption box type anti-collision column, in which the energy absorption box is built into the bottom of the column cylinder, reducing the axial length of the column and increasing the length adjustment range of the column, thereby improving the height adaptability of the energy absorption and anti-collision bracket.

[0005] The technical solutions adopted are as follows:

[0006] The cam is an axially oriented cylinder of the embodiment of the present invention, wherein the cam is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams, each of which is provided with a plurality of cams.

[0007] Furthermore, the floating piston is arranged at the upper end of the energy absorbing member, and a sealing member is provided on the floating piston to isolate the energy absorbing member from the liquid in the circular cavity.

[0008] Preferably, the isolation ring has a plurality of openings.

[0009] Preferably, when the volume of liquid between the floating piston and the piston remains unchanged, the energy absorbing member is deformed by absorbing energy, and its axial length becomes shorter, and the floating piston and the piston move toward the end cap direction at the same time.

[0010] Preferably, the supporting force of the energy absorbing member is greater than the rated load of the column and less than the safe allowable load of the column.

[0011] When the cross section of the floating piston is smaller than the cross section of the piston, the axial shortening dimension of the energy absorbing member after energy absorption deformation is greater than the maximum movable distance of the piston;

[0012] When the cross section of the floating piston is larger than the cross section of the piston, the axial shortening dimension of the energy absorbing member after energy absorption deformation is smaller than the maximum movable distance of the piston;

[0013] When the cross section of the floating piston is equal to the cross section of the piston, the axial shortening dimension generated by the energy absorbing member after energy absorption deformation is equal to the maximum movable distance of the piston.

[0014] The technical solution of the utility model has the following advantages:

[0015] A. The utility model places the energy absorbing member and the floating piston inside the cylinder body and in the lower chamber below the isolation ring, and places the piston body and the piston piston in the upper chamber above the isolation ring. Before and after the energy absorbing member is deformed, the maximum and minimum lengths of the anti-collision column remain unchanged, and the height parameters of the supporting equipment are not affected.

[0016] B. The utility model supports a floating piston above the energy absorbing member, which reduces the displacement stroke of the energy absorbing member compared to the external energy absorbing method placed at the bottom of the anti-collision column. At the same height, the column stroke range can be effectively increased to improve adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present utility model, the drawings required for use in the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is the structural diagram of the traditional external energy-absorbing and anti-impact column;

[0019] Figure 2 It is a structural diagram of the anti-collision column provided by the utility model.

[0020] The symbols provided in the figure are explained as follows:

[0021] 1- piston; 2- guide sleeve; 3- cylinder body, 31- liquid inlet, 32- isolation ring; 4- floating piston, 41- cavity; 5- energy absorbing part; 6- head; 7- piston piston; 8- guide rod; 9- energy absorbing piston; 10- sleeve; a- opening.

[0022] A-upper chamber, A1-annular chamber, A2-circular chamber; B-lower chamber. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 2As shown, the utility model provides a built-in energy absorption box type anti-collision column, including: a piston body 1, a cylinder body 3 and an energy absorbing member 5, the cylinder body 3 is open at both ends, the piston body 1 extends into the cylinder body 3 from the upper open end of the cylinder body 3, and a piston piston 7 is arranged at the lower end thereof, the piston piston 7 forms an axial seal with the inner wall of the cylinder body, a guide sleeve 2 is installed between the piston body 1 and the inner wall of the cylinder body 3, the guide sleeve 2 and the piston 1 form an axial seal, an isolating ring 32 with an opening a is arranged in the inner cavity of the cylinder body 3, the isolating ring 32 divides the inner cavity of the cylinder body 3 into an upper chamber A and a lower chamber B which are connected up and down, the energy absorbing member 5 is arranged in the lower chamber B, a floating piston 4 is arranged between the energy absorbing member 5 and the isolating ring 32, and the floating piston 4 An axial seal is formed between the piston 1, the piston 7 and the guide sleeve 2 in the upper chamber A. The piston 7 divides the upper chamber A into an annular chamber A1 and a circular chamber A2 which are not connected by liquid. The circular chamber A2 is arranged between the piston 7 and the isolation ring 32 and is connected to the liquid inlet 31 arranged on the cylinder 3. The isolation ring 32 is fixed on the inner wall of the cylinder 3 and can preferably be an integral structure with the cylinder 3. The isolation ring 32 can limit the lowest position of the piston 1 and the highest position of the floating piston 4, so that the deformation of the energy absorbing member 5 does not affect the height dimension of the anti-collision column. There can be multiple openings a on the isolation ring 32, so that the circular chamber A2 is connected with the lower chamber B. The isolation ring 32 has an opening a, and the working liquid of the anti-collision column can freely enter the lower chamber B from the circular chamber A2, so that the liquid pressure at the circular chamber A2 and the upper end surface of the floating piston 4 are always equal.

[0025] At the same time, the lower end of the cylinder body 3 is closed by providing a sealing head 6 , which is detachably fixed to the lower end of the cylinder body 3 , and the lower end of the energy absorbing member 5 is placed at the upper end of the sealing head 6 .

[0026] The lower end of the energy absorbing member 5 in the utility model contacts the end cap 6, and the upper end of the energy absorbing member 5 contacts the lower end of the floating piston 4. When the energy absorbing member 5 does not generate compression deformation, the upper end of the floating piston 4 contacts the lower end surface of the isolation ring 32. At the same time, it is also preferred to set a concave cavity 41 on the upper end surface of the floating piston 4, and the circular cavity A2 is connected to the concave cavity 41 through the opening a on the isolation ring 32. A space is left between the energy absorbing member 5 and the inner wall of the cylinder body 3 for the energy absorbing member 5 to deform.

[0027] In addition, the supporting force of the energy absorbing member 5 used in the present invention is greater than the rated load of the active cylinder 1 , and less than the safe allowable load of the active cylinder 1 .

[0028] When the volume of liquid between the floating piston 4 and the piston 7 remains unchanged, the energy absorbing member 5 absorbs energy and deforms, and its axial length becomes shorter, and the floating piston 4 and the piston 1 move toward the end cap 6 at the same time.

[0029] When the cross section of the floating piston 4 is smaller than the cross section of the piston 7, the axial shortening dimension of the energy absorbing member 5 after energy absorption deformation is greater than the maximum movable distance of the piston 1;

[0030] When the cross section of the floating piston 4 is larger than the cross section of the piston 7, the axial shortening dimension of the energy absorbing member 5 after energy absorption deformation is smaller than the maximum movable distance of the piston 1;

[0031] When the cross section of the floating piston 4 is equal to the cross section of the piston 7 , the axial shortening dimension of the energy absorbing member 5 after energy absorption deformation is equal to the maximum movable distance of the piston 1 .

[0032] The working principle of the floating compression energy absorption and anti-collision column provided by the utility model is specifically:

[0033] The piston head and the end cap of a floating compression energy-absorbing anti-collision column in a supporting state are subjected to axial forces in opposite directions. The working liquid in the circular cavity A2 is locked inside the cylinder by a one-way valve installed outside the cylinder body, and the liquid pressure acts on the bottom surface of the piston and the floating piston at the same time. The axial load on the piston is transmitted to the floating piston through the liquid pressure, and then transmitted to the end cap through the floating piston and the energy-absorbing part. When the axial load is less than the rated load of the piston, the energy-absorbing part does not deform to absorb energy. The greater the axial load, the higher the liquid pressure in the piston. When the liquid pressure exceeds the rated pressure of the piston, the safety valve connected to the anti-collision column will open to relieve the pressure to ensure that the pressure inside the column will not be over-pressured.

[0034] When the active column is subjected to a large axial external impact load, due to the instantaneous nature of the impact force, the safety valve cannot respond to the pressure relief in time, and the axial load of the active column will increase and exceed the supporting force of the energy absorbing part. At this time, the external load is transmitted to the floating piston through the liquid pressure, and then to the energy absorbing part. Since the axial external load is greater than the supporting force of the energy absorbing part at this time, the energy absorbing part will deform and absorb energy, causing the space of the chamber where the energy absorbing part is located to become smaller, and the chamber between the floating piston and the isolation ring to become larger. The liquid pressure in the connected concave cavity and the piston cavity will decrease due to the increase in volume, thereby ensuring that the supporting force of the active column will not be greater than its safe allowable load, thereby achieving the function of resisting impact and protecting the column.

[0035] Anything not described in the present invention is applicable to the prior art.

[0036] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present utility model.

Claims

1. A built-in energy absorption box type anti-collision column, comprising a movable column (1), a cylinder (3) and an energy absorbing member (5), wherein both ends of the cylinder (3) are open; the movable column (1) extends into the cylinder (3) from the upper open end of the cylinder (3), and a movable column piston (7) is arranged at the lower end thereof, and a guide sleeve (2) is installed between the movable column (1) and the inner wall of the cylinder (3), characterized in that: An isolating ring (32) with an opening (a) is provided in the inner cavity of the cylinder body (3), and the isolating ring (32) divides the inner cavity of the cylinder body (3) into an upper chamber (A) and a lower chamber (B) which are connected to each other. The energy absorbing member (5) is arranged in the lower chamber (B), and a floating piston (4) is provided between the energy absorbing member (5) and the isolating ring (32); the piston body (1), the piston piston (7) and the guide sleeve (2) are located in the upper chamber (A), and the piston piston (7) The upper chamber (A) is divided into an annular chamber (A1) and a circular chamber (A2) which are not connected by liquid. The circular chamber (A2) is arranged between the piston (7) and the isolation ring (32), and is connected to a liquid inlet (31) arranged on the cylinder body (3). The lower end of the cylinder body (3) is closed by arranging a sealing head (6). The sealing head (6) is detachably fixed to the lower end of the cylinder body (3). The lower end of the energy absorbing member (5) is placed at the upper end of the sealing head (6).

2. The built-in energy absorption box type anti-collision column according to claim 1 is characterized in that: The floating piston (4) is arranged at the upper end of the energy absorbing member (5), and a sealing member is provided on the floating piston (4) to isolate the energy absorbing member (5) from the liquid in the circular cavity (A2).

3. The built-in energy absorption box type anti-collision column according to claim 2 is characterized in that: The isolation ring (32) is provided with a plurality of openings (a).

4. The built-in energy-absorbing box-type anti-collision column according to any one of claims 1 to 3, characterized in that: When the volume of liquid between the floating piston (4) and the piston (7) remains unchanged, the energy absorbing member (5) absorbs energy and deforms, and its axial length becomes shorter, and the floating piston (4) and the piston body (1) move toward the end cap (6) at the same time.

5. The built-in energy-absorbing box-type anti-collision column according to claim 4 is characterized in that: The supporting force of the energy absorbing member (5) is greater than the rated load of the column and less than the safe allowable load of the column.

6. The built-in energy-absorbing box-type anti-collision column according to claim 5 is characterized in that: When the cross section of the floating piston (4) is smaller than the cross section of the piston (7), the axial shortening dimension generated by the energy absorbing member (5) after energy absorption deformation is greater than the maximum movable distance of the piston (1); When the cross section of the floating piston (4) is larger than the cross section of the piston piston (7), the axial shortening dimension generated by the energy absorbing member (5) after energy absorption deformation is smaller than the maximum movable distance of the piston body (1); When the cross section of the floating piston (4) is equal to the cross section of the piston piston (7), the axial shortening dimension generated by the energy absorbing member (5) after energy absorption deformation is equal to the maximum movable distance of the piston body (1).

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