A vibration-damping hydraulic support side plate stability control system

Abstract

This utility model discloses a vibration-damping hydraulic support side plate stability control system, relating to the technical field of coal mining equipment. It includes a side plate jack, a two-way lock, and two safety valves. The upper and lower oil ports of the side plate jack are respectively connected to the two working oil ports of the two-way lock via hydraulic pipelines. This utility model replaces the traditional two-way damping joint with two unidirectional damping joints and optimizes their series connection with the two-way lock, enabling the side plate to maintain stable pilot pressure of the two-way lock during both extension and retraction: during extension, the inlet unidirectional damping joint is open to prevent negative pressure, and the return unidirectional damping joint throttles and controls the speed; during retraction, the return unidirectional damping joint is open to ensure pressure stability, and the inlet unidirectional damping joint throttles and controls the speed. This fundamentally eliminates the problem of "intermittent pressure loss leading to frequent valve opening and closing."

Description

Technical Field

[0001] This utility model belongs to the technical field of coal mining equipment, specifically relating to a vibration-damping hydraulic support side plate stability control system. Background Technology

[0002] In fields such as coal mining and underground engineering, hydraulic supports are core equipment for ensuring operational safety and efficiency. Their side plates play a crucial role in preventing coal wall spalling and providing auxiliary support.

[0003] However, existing hydraulic support side plates have significant technical defects in actual working conditions: during the extension and retraction of the side plates, they need to go through a falling action from a high position, during which continuous vibration is common. This not only affects the stable operation of the side plates, but also aggravates component wear and shortens the service life of the side plates and related hydraulic components.

[0004] Further analysis of the technical root cause of the vibration phenomenon reveals that the traditional side support hydraulic system, in order to achieve throttling control, incorporates a bidirectional damping connector at the inlet of the lower chamber of the bidirectional lock. This connector throttles during both inlet and outlet operations. When the side support extends, the bidirectional lock opens momentarily, and the side support jack, bearing the weight of the side support, rapidly discharges oil from its upper chamber under gravity, causing a momentary negative pressure in the lower chamber. According to Pascal's principle, the oil pressure in the lower chamber drops sharply. The bidirectional throttling characteristic of the bidirectional damping connector causes intermittent pressure loss between the bidirectional lock and the damping connector due to the negative pressure, resulting in the pilot pressure of the bidirectional lock dropping to zero and the valve core frequently closing. This cycle of "pressure loss - valve core closure - pressure recovery - valve core opening" directly manifests as continuous vibration of the side support in actual working conditions, severely affecting the operational stability and reliability of the hydraulic support.

[0005] Therefore, we propose a vibration-damping hydraulic support side plate stability control system to solve the above problems. Utility Model Content

[0006] In view of the fact that the side guard plate needs to fall from a high position during the extension and retraction process, which generally causes continuous vibration, this invention provides a vibration-resistant hydraulic support side guard plate stability control system.

[0007] The solution adopted by this utility model to solve its technical problem is: a vibration-damping hydraulic support side plate stability control system, including a side plate jack, a two-way lock and two safety valves, wherein the upper chamber oil port and the lower chamber oil port of the side plate jack are respectively connected to the two working oil ports of the two-way lock through hydraulic pipelines. The inlet end of the bidirectional lock is connected in series with a one-way damping connector, the other end of which is connected to the main inlet circuit of the hydraulic system. The return end of the bidirectional lock is connected in series with another one-way damping connector, the other end of which is connected to the main return circuit of the hydraulic system.

[0008] Preferably, the rated inlet pressure of the hydraulic system is 31.5 MPa.

[0009] Preferably, the two safety valves are installed in parallel on the left and right mounting interfaces of the bidirectional lock to directly monitor the real-time pressure inside the bidirectional lock.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model replaces the traditional bidirectional damping joint with two unidirectional damping joints and optimizes their series connection with the bidirectional lock, enabling the side guard plate to maintain stable pilot pressure of the bidirectional lock during both extension and retraction: during extension, the inlet unidirectional damping joint is open to avoid negative pressure, and the return unidirectional damping joint throttles and controls speed; during retraction, the return unidirectional damping joint is open to ensure pressure stability, and the inlet unidirectional damping joint throttles and controls speed. This fundamentally eliminates the problem of "intermittent pressure loss leading to frequent valve opening and closing," achieving vibration-free operation of the side guard plate, reducing impact wear on core components such as the side guard jack and bidirectional lock, significantly extending the service life of the entire side guard plate system, and reducing equipment maintenance frequency and costs.

[0011] 2. This utility model retains the core function of damping and throttling, which can effectively control the falling speed of the side guard plate under gravity, prevent it from rapidly impacting the coal wall or hydraulic support body, ensure operational safety, and achieve better operating results. Attached Figure Description

[0012] Figure 1 This is a diagram of the stable control system of this utility model; Figure 2 This is a front view structural diagram of the side guard plate of this utility model. Figure 3 For the operation of the side guard plate of this utility model Figure 1 ; Figure 4 For the operation of the side guard plate of this utility model Figure 2 ; Figure 5 This is a front view cross-sectional structural diagram of the unidirectional damping joint of this utility model; Figure 6 This is a frontal cross-sectional view of the flow channel structure of this utility model.

[0013] In the diagram: 1-Side support jack; 2-Safety valve; 3-Two-way lock; 4-One-way damping connector; 5-Top beam; 6-Side support plate; 41-Connector valve body; 411-Small cavity; 412-Conical cavity; 413-Rough cavity; 414-Threaded hole; 42-Positioning plug; 43-End cap; 44-Reset spring; 45-Main valve core; 451-Through hole; 46-Sealing ring; 47-Conical valve; 471-Damping hole; 48-Fluid passage. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Please see Figure 1-4 This utility model provides a technical solution for a vibration-damping hydraulic support side plate stability control system: Example 1: according to Figure 1-4 As shown, the system includes a side protection jack 1, a two-way lock 3, and two safety valves 2. The upper and lower oil ports of the side protection jack 1 are connected to the two working oil ports of the two-way lock 3 through hydraulic pipelines. After the side protection plate 6 reaches the target position, the two-way lock 3 can lock the oil passage of the side protection jack 1 to prevent the side protection plate 6 from falling accidentally due to gravity or external force, thus ensuring operational safety.

[0016] A one-way damping connector 4 is connected in series at the inlet end of the bidirectional lock 3. The other end of the one-way damping connector 4 is connected to the main inlet circuit of the hydraulic system. Another one-way damping connector 4 is connected in series at the return end of the bidirectional lock 3. The other end of the one-way damping connector 4 is connected to the main return circuit of the hydraulic system. By replacing the traditional bidirectional damping connector with two one-way damping connectors 4 in opposite directions and optimizing their series connection with the bidirectional lock 3, the pilot pressure of the bidirectional lock 3 can be kept stable during both extension and retraction of the side plate 6: When extending, the one-way damping connector 4 at the inlet end is open to avoid negative pressure, and the one-way damping connector 4 at the return end controls the flow and speed; when retracting, the one-way damping connector 4 at the return end is open to ensure pressure stability, and the one-way damping connector 4 at the inlet end controls the flow and speed. This measure fundamentally eliminates the problem of "frequent opening and closing of the valve core due to intermittent pressure loss". This addresses the issue of vibration-free operation of the side guard plate 6, reduces impact wear on core components such as the side guard jack 1 and the two-way lock 3, significantly extends the service life of the entire side guard plate 6 system, and reduces equipment maintenance frequency and costs.

[0017] Two safety valves 2 are installed in parallel on the left and right mounting interfaces of the two-way lock 3, respectively, to directly monitor the real-time pressure inside the two-way lock 3. According to the rated inlet pressure of the hydraulic system of 31.5MPa, when the pressure of the side support jack 1 or the hydraulic circuit exceeds 31.5MPa due to sudden load changes, oil circuit blockage, or other problems, the safety valve 2 will automatically open and relieve pressure to prevent damage to components such as the side support jack 1 and the two-way lock 3 due to overpressure, and at the same time prevent the side support plate 6 from malfunctioning due to abnormal pressure.

[0018] In practical use, this utility model provides a stability control system for the anti-vibration hydraulic support side plate 6. Side guard plate 6 extended working condition (e.g.) Figure 3 (as shown) S1. The operator supplies high-pressure liquid into the lower chamber of the support jack 1 through the electro-hydraulic control system of the hydraulic support, and at the same time provides a passage for the return liquid in its upper chamber. S2. Before entering the bidirectional lock 3, the high-pressure liquid flows through the two one-way damping joints 4 on its front side. During this process, the one-way damping joint 4 on the right side is in a throttling state, and the one-way damping joint 4 on the left side is in a conducting state. S3. High-pressure liquid enters the lower chamber of the side protection jack 1, pushing the piston rod to extend at a constant speed. The oil in the upper chamber of the jack 1 needs to be discharged under the action of gravity, but due to the damping and throttling effect in the return fluid circuit, its discharge speed is effectively limited, thereby driving the side protection plate 6 to smoothly unfold to the required working position.

[0019] S4. When the side guard plate 6 reaches the designated position, the control system stops the fluid supply, and the two-way lock 3 automatically locks the oil passage of the side guard jack 1 to prevent the side guard plate 6 from falling accidentally, thus completing the extension operation.

[0020] Side guard plate 6 retraction operation (e.g.) Figure 4 (as shown) S1. The operator uses the control system to switch to supplying high-pressure liquid to the upper chamber of the support jack 1, while simultaneously providing a path for the return liquid to its lower chamber. S2. Before entering the bidirectional lock 3, the high-pressure liquid flows through the two one-way damping joints 4 on its front side. During this process, the one-way damping joint 4 on the left side is converted to a throttling state, and the one-way damping joint 4 on the right side is converted to a conducting state. S3. High-pressure liquid enters the upper chamber of the side jack 1, pushing the piston rod to retract at a constant speed. The side plate 6 tends to fall faster under its own weight, which increases the demand for oil discharge in its lower chamber. However, due to the damping and throttling effect in the return fluid path of the lower chamber, the oil discharge speed is limited, thus preventing the side plate 6 from falling too fast when it retracts.

[0021] S4. When the side guard plate 6 is fully retracted, the control system stops the liquid supply, the two-way lock 3 automatically closes, and the side guard jack 1 is locked, so that the side guard plate 6 is kept in a safe storage state.

[0022] Example 2: according to Figure 5 and Figure 6 As shown, a technical solution for a one-way damping joint includes a joint valve body 41 and a valve core unit. A fluid channel 48 is provided through the joint valve body 41. The fluid channel 48 is formed by a threaded hole 414, a coarse cavity 413, a conical cavity 412 and a fine cavity 411 coaxially connected from top to bottom along the preset conduction direction of the emulsion.

[0023] The valve core unit is adapted and assembled in the fluid channel 48, so that the emulsion is in a damped state when flowing in from the upper end of the fluid channel 48 and in a conductive state when flowing in from the lower end.

[0024] The valve core unit includes a positioning screw plug 42, an end cap 43, a return spring 44, a main valve core 45, and a conical valve 47. The positioning screw plug 42 is threaded into a threaded hole 414. The conical valve 47 is adapted to be installed inside the conical cavity 412. A damping hole 71 is provided through the central axis of the conical valve 47. An annular sealing groove is provided on the outer peripheral wall of the conical valve 7. A sealing ring 46 is embedded in the sealing groove. The outer peripheral surface of the sealing ring 46 is adapted to fit the inner wall of the conical cavity 412. The sealing ring 46 is an O-ring made of nitrile rubber. When the emulsion flows in the "damping direction", it can completely seal the gap between the conical valve 47 and the conical cavity 412, forcing the fluid to pass only through the damping hole 471 at the central axis, avoiding throttling failure caused by gap leakage, and realizing "one-way precise flow control".

[0025] End cap 43, return spring 44, and main valve core 45 are arranged sequentially along the direction from positioning screw 42 to conical valve 47. End cap 43 abuts against positioning screw 42, and main valve core 45 abuts against conical valve 47. The two ends of return spring 44 elastically abut against end cap 43 and main valve core 45 respectively. Return spring 44 is a low-stiffness soft spring. The elastic coefficient of soft spring satisfies the following: when the emulsion flows in the conduction direction, the pressure of the emulsion acting on the end face of conical valve 47 can push conical valve 47 and main valve core 45 to synchronously compress return spring 44, so that conical valve 47 separates from the conical surface of conical cavity 412 to form a flow gap.

[0026] The main valve core 45 is adapted to be installed in the coarse cavity 413 and can slide up and down along the coarse cavity 413. Multiple through holes 451 are arranged around the side wall of the main valve core 45, so that the emulsion in the flow channel 48 can enter the inner cavity of the main valve core 45 through the multiple through holes 451. Each through hole 451 is connected to the inner cavity of the main valve core 45, and the inner cavity of the main valve core 45, the inner cavity of the end cap 43, and the inner cavity of the positioning screw plug 42 are connected in sequence to form an internal channel for the flow of emulsion, so that the emulsion can quickly flow out of the connector valve body 41 through the inner cavities of the end cap 43 and the positioning screw plug 42.

Claims

1. A vibration-damping hydraulic support side plate stabilization control system, comprising a side plate jack, a two-way lock, and two safety valves, characterized in that: The upper and lower oil ports of the support jack are respectively connected to the two working oil ports of the two-way lock through hydraulic pipelines. The inlet end of the bidirectional lock is connected in series with a one-way damping connector, the other end of which is connected to the main inlet circuit of the hydraulic system. The return end of the bidirectional lock is connected in series with another one-way damping connector, the other end of which is connected to the main return circuit of the hydraulic system.

2. The anti-vibration hydraulic support side plate stability control system according to claim 1, characterized in that: The rated inlet pressure of the hydraulic system is 31.5 MPa.

3. The anti-vibration hydraulic support side plate stability control system according to claim 1, characterized in that: The two safety valves are installed in parallel on the left and right mounting interfaces of the bidirectional lock to directly monitor the real-time pressure inside the bidirectional lock.

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