Two-way extending jack for coal mine hydraulic support

Abstract

The utility model belongs to the field of jacks, and particularly relates to a two-way extending jack for a coal mine hydraulic support, an integrated double-extending integral piston rod is arranged in a two-way extending cylinder barrel, and the integrated double-extending integral piston rod comprises a left piston rod, a right piston rod and a middle piston. The left piston rod, the right piston rod and the middle piston are integrally formed, and the middle piston is located in the two-way extending cylinder barrel and divides the interior of the two-way extending cylinder barrel into a left cavity and a right cavity which are independent. The hydraulic jack is reasonable and reliable in structural design, the integrated double-extension integral piston rod extends leftwards through the left guide sleeve, and when liquid enters the connecting seat at the right guide sleeve, the integrated double-extension integral piston rod extends rightwards through the right guide sleeve, so that the problems that the action of operating two jacks is tedious and synchronization is difficult to realize are solved.

Description

Technical Field

[0001] The utility model belongs to the field of jacks, and in particular relates to a two-way extending jack for a coal mine hydraulic support. Background Art

[0002] Hydraulic support is the key equipment of comprehensive mechanized coal mining equipment. It is used in conjunction with coal mining machine and scraper conveyor. Its function is to effectively support and control the roof of the working face, ensure the safe working space of workers and equipment, and is of great significance to the safe production of coal mines, increase the output of the working face, improve the labor intensity of the working face and improve labor efficiency.

[0003] The hydraulic support is mainly composed of four parts: bearing structure, actuator, control element, and auxiliary device. Among them, the actuator includes columns and various jacks, which are responsible for completing various actions of the hydraulic support. The actuator is a key component of the hydraulic support, and its performance directly affects the working performance and life of the hydraulic support.

[0004] The bottom of the cylinder and the piston rod of an ordinary jack are respectively connected to two components that need to produce relative motion. When in use, one end is fixed and the other end is extended. An ordinary jack can only be extended in one direction. When the bottom of the cylinder is fixed, the piston rod end extends outward. When the piston rod end is fixed, the bottom of the cylinder extends outward. When it is necessary to extend in two directions, two jacks must be set up or the installation direction of the jack must be changed, which is complex in structure and inconvenient to operate. It is not possible to achieve the function of extending in two directions by only setting up one jack. Especially when it is necessary to extend in one direction and retract in the other direction synchronously, if two jack structures are used, two sets of inlet and return liquid control systems must be equipped for the two jacks. When operating one jack to extend, the other jack must also be operated to retract. Without the use of program automatic control, the operation is cumbersome and it is difficult to achieve synchronization. Therefore, the two-way extension jack solution reduces the number of jacks, simplifies the inlet and return liquid control system, and solves the problem that the operation of the two jacks is cumbersome and difficult to achieve synchronization. Utility Model Content

[0005] The utility model aims to provide a two-way extending jack for a coal mine hydraulic support, which solves the problem that the operation of two jacks is complicated and difficult to achieve synchronization.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a two-way extension jack for a coal mine hydraulic support, the interior of the two-way extension cylinder is provided with an integrated double-extending integral piston rod, the integrated double-extending integral piston rod comprises a left piston rod, a right piston rod and a middle piston, the left piston rod, the right piston rod and the middle piston are integrally formed, the middle piston is located inside the two-way extension cylinder, the middle piston divides the interior of the two-way extension cylinder into two independent left and right cavities, the two sides of the two-way extension cylinder are respectively fixedly connected with a left guide sleeve and a right guide sleeve, the top of the two-way extension cylinder is fixedly installed with a left liquid inlet connecting seat, the middle piston is fixedly connected with a mountain-shaped sealing ring, the interiors of the left guide sleeve and the right guide sleeve are fixedly connected with O-rings, the O-rings and the integrated double extension integral piston rod are fixedly connected. The piston rod is slidably connected, and the interior of the left guide sleeve and the right guide sleeve are fixedly connected with a retaining ring 1, and the retaining ring 1 is slidably connected to the integrated double-extending integral piston rod, the interior of the left guide sleeve and the right guide sleeve are fixedly connected with a piston rod guide ring, and the piston rod guide ring is slidably connected to the integrated double-extending integral piston rod, the interior of the left guide sleeve and the right guide sleeve are fixedly connected with a bud-shaped sealing ring, and the bud-shaped sealing ring is slidably connected to the integrated double-extending integral piston rod, the interior of the left guide sleeve and the right guide sleeve are fixedly connected with a retaining ring 2, and the retaining ring 2 is slidably connected to the integrated double-extending integral piston rod, the inner side of the two-way extending cylinder is fixedly sleeved with two symmetrically distributed dust rings, and the top of the two-way extending cylinder and located on the right side of the left liquid inlet connecting seat is fixedly connected with a right liquid inlet connecting seat.

[0007] The principle of the utility model is that an integrated double-extending whole piston rod is arranged inside the double-extending cylinder of the jack, and a liquid inlet connection seat is arranged near the guide sleeve. When the left liquid inlet connection seat at the left guide sleeve is filled with liquid, the integrated double-extending whole piston rod is extended to the left through the left guide sleeve, and when the right liquid inlet connection seat at the right guide sleeve is filled with liquid, the integrated double-extending whole piston rod is extended to the right through the right guide sleeve, so that only one double-extending jack is provided to realize the function of extending to the left and right directions respectively. Through the effects of the mountain-shaped sealing ring, the O-shaped sealing ring, the bud-shaped sealing ring and the dust ring, the sealing and protective effect of the inside of the double-extending cylinder can be greatly improved.

[0008] The beneficial effects of the utility model are as follows: the structural design is reasonable and reliable, an integrated double-extending integral piston rod is arranged inside the bidirectional extension cylinder of the jack, and a liquid inlet connection seat is arranged near the guide sleeve. When the connection seat at the left guide sleeve is filled with liquid, the integrated double-extending integral piston rod extends to the left through the left guide sleeve, and when the connection seat at the right guide sleeve is filled with liquid, the integrated double-extending integral piston rod extends to the right through the right guide sleeve. Only one jack is provided to extend and push the hydraulic support in two directions according to needs, and it is stable and reliable during repeated use. And only one liquid inlet and return control system is needed, so that it can be extended in one direction while being recovered in the other direction synchronously, reducing the number of jacks, simplifying the liquid inlet and return control system, and solving the problem that the operation of two jacks is cumbersome and difficult to achieve synchronization.

[0009] Further, the left liquid inlet connection seat penetrates the bidirectionally extending cylinder barrel, and the left liquid inlet connection seat is communicated with the left guide sleeve. By designing the communication between the left liquid inlet connection seat and the left guide sleeve, the left liquid inlet connection seat can input hydraulic oil into the left guide sleeve.

[0010] Further, the right liquid inlet connection seat penetrates the bidirectionally extending cylinder barrel, and the right liquid inlet connection seat is communicated with the right guide sleeve. By designing the communication between the right liquid inlet connection seat and the right guide sleeve, the right liquid inlet connection seat can input hydraulic oil into the inside of the right guide sleeve.

[0011] Furthermore, the dust ring is fixedly connected to the left guide sleeve and the right guide sleeve respectively, and the dust ring is slidably connected to the integrated double-extending integral piston rod. By designing the dust ring, the inside of the two-way extending cylinder can be dust-proof and sealed.

[0012] Furthermore, a piston guide ring is fixedly connected to the inner side of the mountain-shaped sealing ring, and the piston guide ring is fixedly connected to the middle piston. By designing the piston guide ring, the movement of the piston can be guided.

[0013] Further, the left guide sleeve is slidably connected with the integrated double-extending integral piston rod. By designing the left guide sleeve, the integrated double-extending integral piston rod extending from the left end can be guided.

[0014] Further, the right guide sleeve is slidably connected with the integrated double-extending integral piston rod. By designing the right guide sleeve, the integrated double-extending integral piston rod extending from the right end can be guided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a two-way extension jack for a coal mine hydraulic support according to an embodiment of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the integrated double-extending integral piston rod.

[0017] The marks in the drawings of the specification include: two-way extending cylinder 1, integrated double-extending integral piston rod 2, left guide sleeve 3, piston guide ring 4, mountain-shaped sealing ring 5, O-ring 6, retaining ring 1 7, piston rod guide ring 8, bud-shaped sealing ring 9, retaining ring 2 10, dust ring 11, right guide sleeve 12, left liquid inlet connecting seat 13, right liquid inlet connecting seat 14, left piston rod 21, right piston rod 22, and middle piston 23. DETAILED DESCRIPTION

[0018] The following is further described in detail through specific implementation methods:

[0019] like Figure 1 As shown, this embodiment provides a two-way extension jack for a coal mine hydraulic support, including a two-way extension cylinder 1, an integrated two-way extension integral piston rod 2 is arranged inside the two-way extension cylinder 1, and the integrated two-way extension integral piston rod 2 includes a left piston rod 21, a right piston rod 22 and a middle piston 23, and the left piston rod 21, the right piston rod 22 and the middle piston 23 are integrally formed (as shown in FIG. Figure 2 As shown), the middle piston 23 is located inside the two-way extending cylinder 1, and the middle piston 23 divides the inside of the two-way extending cylinder 1 into two independent left and right cavities. The two sides of the two-way extending cylinder 1 are respectively fixedly connected with a left guide sleeve 3 and a right guide sleeve 12. By designing the left guide sleeve 3, the integrated double-extending integral piston rod 2 extending from the left end can be guided. The inside of the two-way extending cylinder 1 and located on the right side of the left guide sleeve 3 is fixedly connected with a right guide sleeve 12. The right guide sleeve 12 is slidably connected to the integrated double-extending integral piston rod 2. By designing the right guide sleeve 12, the integrated double-extending integral piston rod 2 extending from the right end can be guided.

[0020] like Figure 1 As shown, a left liquid inlet connection seat 13 is fixedly installed on the top of the two-way extending cylinder 1. The left liquid inlet connection seat 13 penetrates the two-way extending cylinder 1. The left liquid inlet connection seat 13 is connected to the left guide sleeve 3. By designing the connection between the left liquid inlet connection seat 13 and the left guide sleeve 3, the left liquid inlet connection seat 13 can input hydraulic oil into the left guide sleeve 3. The middle piston 23 is fixedly connected to a mountain-shaped sealing ring 5. The inner side of the mountain-shaped sealing ring 5 is fixedly connected to a piston guide ring 4. The piston guide ring 4 is fixedly connected to the middle piston 23. By designing the piston guide ring 4, the movement of the piston can be guided to increase the stability of the middle piston 23. The inside of the left guide sleeve 3 and the right guide sleeve 12 are both fixedly connected to an O-ring 6. The O-ring 6 is slidably connected to the integrated double-extending integral piston rod 2. The inside of the left guide sleeve 3 and the right guide sleeve 12 are both fixedly connected to a retaining ring 7. The retaining ring 7 is slidably connected to the integrated double-extending integral piston rod 2.

[0021] like Figure 1As shown, the interior of the left guide sleeve 3 and the right guide sleeve 12 are fixedly connected with a piston rod guide ring 8, and the piston rod guide ring 8 is slidably connected to the integrated double-extending integral piston rod 2. The interior of the left guide sleeve 3 and the right guide sleeve 12 are fixedly connected with a bud-shaped sealing ring 9, and the bud-shaped sealing ring 9 is slidably connected to the integrated double-extending integral piston rod 2. The interior of the left guide sleeve 3 and the right guide sleeve 12 are fixedly connected with a retaining ring 10, and the retaining ring 10 is slidably connected to the integrated double-extending integral piston rod 2. The inner side of the two-way extending cylinder 1 is fixedly sleeved with two symmetrically distributed dust rings 11. The dust ring 11 is fixedly connected with the left guide sleeve 3 and the right guide sleeve 12 respectively, the dust ring 11 is slidably connected with the integrated double-extending integral piston rod 2, and the dust ring 11 can be designed to seal the inside of the two-way extending cylinder 1 against dust, and the top of the two-way extending cylinder 1 and the right side of the left liquid inlet connecting seat 13 are fixedly connected with a right liquid inlet connecting seat 14, the right liquid inlet connecting seat 14 passes through the two-way extending cylinder 1, and the right liquid inlet connecting seat 14 is connected with the right guide sleeve 12. By designing the connection between the right liquid inlet connecting seat 14 and the right guide sleeve 12, the right liquid inlet connecting seat 14 can input hydraulic oil into the right guide sleeve 12.

[0022] The above structure realizes support and guidance for movement in two directions, and a mountain-shaped sealing ring 5 is provided at the same time. The mountain-shaped sealing ring 5 is a bidirectional sealing ring, that is, it can realize sealing of the piston in two directions along the axis, thereby driving the integrated double-extending overall piston rod 2 to extend in both directions.

[0023] The specific implementation process of the utility model is as follows: an integrated double-extending whole piston rod 2 is arranged inside the two-way extending cylinder 1 of the jack, and a liquid inlet connection seat is arranged near the guide sleeve. When the left liquid inlet connection seat 13 at the left guide sleeve 3 is filled with liquid, the integrated double-extending whole piston rod 2 is extended to the left through the left guide sleeve 3 (and the right side is retracted at the same time). When the right liquid inlet connection seat 14 at the right guide sleeve 12 is filled with liquid, the integrated double-extending whole piston rod 2 is extended to the right through the right guide sleeve 12 (and the left side is retracted at the same time). Thus, only one two-way extending jack is set to realize the function of extending in two directions, left and right. Through the effects of the mountain-shaped sealing ring 5, the O-shaped sealing ring 6, the bud-shaped sealing ring 9 and the dust ring 11, the sealing and protective effect of the inside of the two-way extending cylinder 1 can be greatly improved.

[0024] The beneficial effects of the utility model are: reasonable and reliable structural design, an integrated double-extending integral piston rod 2 is arranged inside the two-way extending cylinder 1 of the jack, and a liquid inlet connecting seat is arranged near the guide sleeve. When liquid is introduced into the connecting seat at the left guide sleeve 3, the integrated double-extending integral piston rod 2 is extended to the left through the left guide sleeve 3. When liquid is introduced into the connecting seat at the right guide sleeve 12, the integrated double-extending integral piston rod 2 is extended to the right through the right guide sleeve 12. Only one jack is provided to realize extending and pushing the hydraulic support in two directions according to needs, and it is stable and reliable during repeated use.

[0025] That is, when liquid enters the left cavity, the piston drives the piston rod to move to the right, so that the right piston rod 22 is extended, and the left piston rod 21 moves to the right synchronously, so that the left piston rod 21 is retracted; when liquid enters the right cavity, the piston drives the piston rod to move to the left, so that the left piston rod 21 is extended, and the right piston rod 22 moves to the left synchronously, so that the right piston rod 22 is retracted.

[0026] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A two-way extension jack for a coal mine hydraulic support, comprising a two-way extension cylinder, characterized in that: The interior of the two-way extending cylinder is provided with an integrated double-extending integral piston rod, and the integrated double-extending integral piston rod comprises a left piston rod, a right piston rod and a middle piston. The left piston rod, the right piston rod and the middle piston are integrally formed, and the middle piston is located inside the two-way extending cylinder, and the middle piston divides the interior of the two-way extending cylinder into two independent left and right cavities, and the two sides of the two-way extending cylinder are respectively fixedly connected with a left guide sleeve and a right guide sleeve, and the top of the two-way extending cylinder is fixedly installed with a left liquid inlet connecting seat, and the middle piston is fixedly connected with a mountain-shaped sealing ring, and the interiors of the left guide sleeve and the right guide sleeve are fixedly connected with O-rings, and the O-rings are slidably connected to the integrated double-extending integral piston rod. The inside of the guide sleeve is fixedly connected with a retaining ring 1, and the retaining ring 1 is slidably connected to the integrated double-extending integral piston rod. The inside of the left guide sleeve and the right guide sleeve are fixedly connected with a piston rod guide ring, and the piston rod guide ring is slidably connected to the integrated double-extending integral piston rod. The inside of the left guide sleeve and the right guide sleeve are fixedly connected with a bud-shaped sealing ring, and the bud-shaped sealing ring is slidably connected to the integrated double-extending integral piston rod. The inside of the left guide sleeve and the right guide sleeve are fixedly connected with a retaining ring 2, and the retaining ring 2 is slidably connected to the integrated double-extending integral piston rod. The inner side of the two-way extending cylinder is fixedly sleeved with two symmetrically distributed dust rings, and the top of the two-way extending cylinder and located on the right side of the left liquid inlet connecting seat is fixedly connected with a right liquid inlet connecting seat.

2. The two-way extension jack for coal mine hydraulic support according to claim 1 is characterized in that: The left liquid inlet connecting seat passes through the bidirectionally extending cylinder barrel, and the left liquid inlet connecting seat is communicated with the left guide sleeve.

3. The two-way extension jack for coal mine hydraulic support according to claim 1 is characterized in that: The right liquid inlet connection seat passes through the bidirectionally extending cylinder barrel, and the right liquid inlet connection seat is communicated with the right guide sleeve.

4. The two-way extension jack for coal mine hydraulic support according to claim 1 is characterized in that: The dustproof ring is fixedly connected to the left guide sleeve and the right guide sleeve respectively, and the dustproof ring is slidably connected to the integrated double-extended integral piston rod.

5. The two-way extension jack for coal mine hydraulic support according to claim 1 is characterized in that: The inner side of the mountain-shaped sealing ring is fixedly connected with a piston guide ring, and the piston guide ring is fixedly connected with the middle piston.

6. The two-way extension jack for coal mine hydraulic support according to claim 1 is characterized in that: The left guide sleeve is slidably connected to the integrated double-extended integral piston rod.

7. The two-way extension jack for coal mine hydraulic support according to claim 1 is characterized in that: The right guide sleeve is slidably connected to the integrated double-extending integral piston rod.

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