A hydraulic support back fluid damping joint and a hydraulic support inlet fluid damping joint

Abstract

The utility model discloses a kind of liquid return damping joints for hydraulic support, it is related to the field of damping joint, including joint valve body and valve core unit, fluid passage one is passed through and arranged in the joint valve body, the utility model is provided with liquid return damping joint and liquid inlet damping joint, when emulsion flows along preset conduction direction, fluid pressure can overcome the elasticity of reset spring, open the contact surface of conic core valve and conical cavity, form unobstructed flow channel, nearly unobstructed flow circulation;When emulsion flows reversely, conic core valve contacts with conical cavity under the action of reset spring and fluid pressure, sealing ring plays sealing role at this time, emulsion can only pass through tiny damping hole, produce remarkable throttling effect, the characteristics of this "one-way throttling, reverse unobstructed flow", perfect solution traditional fixed damping joint "two-way throttling" caused emulsion unobstructed, execute element action tardy and other problems, effectively shorten the action time of hydraulic support, such as lifting frame, moving frame.

Description

Technical Field

[0001] This utility model belongs to the field of damping joints, specifically relating to a return damping joint and an inlet damping joint for hydraulic supports. Background Technology

[0002] Hydraulic supports are the core of modern fully mechanized mining face support equipment, and the stability and controllability of their hydraulic systems directly affect the safety and efficiency of coal mining operations. In this system, the operating speed of actuators (such as columns and jacks) often needs to be precisely controlled according to different working conditions. For example, when slowly supporting the roof or smoothly retracting the supports, it is necessary to throttle and adjust the flow rate of the emulsion.

[0003] Currently, the most common flow control method used in the industry is to install a damping connector in the inlet line of the actuator. This connector essentially reduces the diameter of its internal flow orifice through machining, thereby limiting the cross-sectional area through which the emulsion flows, achieving the purpose of throttling. However, this traditional damping connector has an inherent technical flaw: its flow orifice is fixed. Therefore, the same throttling resistance is generated both when the emulsion enters the actuator (inlet) and when it returns from the actuator (outlet), resulting in a "bidirectional throttling" effect.

[0004] In most operating conditions of hydraulic supports, the system only needs to control the flow rate of fluid in one direction (such as inlet or outlet), while the fluid in the other direction must flow smoothly to avoid pressure loss or action delay. For example, during the support lifting process, only the inlet flow rate needs to be throttled to achieve smooth lifting, while the outlet flow needs to flow unimpeded to quickly discharge the emulsion in the cylinder. If a traditional double-throttle damping joint is used, the throttling effect during the outlet process will cause poor outlet flow in the cylinder, prolonging the lifting time and affecting production efficiency.

[0005] Therefore, we propose a return damping connector and an inlet damping connector for hydraulic supports to solve the above problems. Utility Model Content

[0006] To address the problem that the throttling effect during the return process of traditional double-throttling damping joints can lead to poor hydraulic cylinder return, prolonging the lifting time and affecting production efficiency, this utility model provides a return damping joint and an inlet damping joint for hydraulic supports.

[0007] The solution adopted by this utility model to solve its technical problem is: a return fluid damping joint for a hydraulic support, including a joint valve body and a valve core unit. A fluid channel is opened through the joint valve body. The fluid channel is composed of a thin cavity, a conical cavity, a coarse cavity and a threaded hole coaxially connected from top to bottom along the preset conduction direction of the emulsion. The valve core unit is adapted to be assembled in the fluid channel one, so that the emulsion is in a conducting state when flowing in from the upper end of the fluid channel one and in a damped state when flowing in from the lower end. The valve core unit includes a positioning screw plug, an end cap, a return spring, a main valve core, and a conical valve. The positioning screw plug is threaded into a threaded hole, and the conical valve is adapted to be installed in a conical cavity. A damping hole is provided through the central axis of the conical valve. The end cap, return spring, and main valve core are arranged sequentially along the direction from the positioning screw plug to the conical valve, with the end cap abutting against the positioning screw plug, the main valve core abutting against the conical valve, and the two ends of the return spring elastically abutting against the end cap and the main valve core, respectively. The main valve core is adapted to be installed in the coarse cavity and can slide up and down along the coarse cavity. Multiple through holes are arranged around the side wall of the main valve core. Each through hole is connected to the inner cavity of the main valve core. The inner cavity of the main valve core, the inner cavity of the end cap, and the inner cavity of the positioning screw plug are connected in sequence to form an internal channel for the flow of emulsion.

[0008] Preferably, the outer peripheral wall of the conical valve is provided with an annular sealing groove, and a sealing ring is embedded in the sealing groove. The outer peripheral surface of the sealing ring is adapted to fit the inner wall of the conical cavity.

[0009] Preferably, the return spring is a low-stiffness soft spring.

[0010] Preferably, the sealing ring is an O-ring made of nitrile rubber.

[0011] A hydraulic support fluid inlet damping connector includes a connector valve body and a valve core unit. A fluid channel two is provided through the connector valve body. The fluid channel two is formed by a threaded hole, a coarse cavity, a conical cavity and a fine cavity coaxially connected from top to bottom along the preset conduction direction of the emulsion. The valve core unit is adapted to be assembled in the fluid channel two, so that the emulsion is in a damped state when flowing in from the upper end of the fluid channel two and in a conductive state when flowing in from the lower end. The valve core unit includes a positioning screw plug, an end cap, a return spring, a main valve core, and a conical valve. The positioning screw plug is threaded into a threaded hole, and the conical valve is adapted to be installed in a conical cavity. A damping hole is provided through the central axis of the conical valve. The end cap, return spring, and main valve core are arranged sequentially along the direction from the positioning screw plug to the conical valve, with the end cap abutting against the positioning screw plug, the main valve core abutting against the conical valve, and the two ends of the return spring elastically abutting against the end cap and the main valve core, respectively. The main valve core is adapted to be installed in the coarse cavity and can slide up and down along the coarse cavity. Multiple through holes are arranged around the side wall of the main valve core. Each through hole is connected to the inner cavity of the main valve core. The inner cavity of the main valve core, the inner cavity of the end cap, and the inner cavity of the positioning screw plug are connected in sequence to form an internal channel for the flow of emulsion.

[0012] Preferably, the outer peripheral wall of the conical valve is provided with an annular sealing groove, and a sealing ring is embedded in the sealing groove. The outer peripheral surface of the sealing ring is adapted to fit the inner wall of the conical cavity.

[0013] Preferably, the return spring is a low-stiffness soft spring.

[0014] Preferably, the sealing ring is an O-ring made of nitrile rubber.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, by setting a return damping joint and an inlet damping joint, allows the fluid pressure to overcome the spring force of the return spring when the emulsion flows in the preset conduction direction, opening the contact surface between the conical valve and the conical cavity to form a smooth flow channel with almost no obstruction. When the emulsion flows in the reverse direction, the conical valve contacts the conical cavity under the action of the return spring and fluid pressure, and the sealing ring plays a sealing role. The emulsion can only pass through the tiny damping hole, producing a significant throttling effect. This "one-way throttling and reverse smooth flow" characteristic perfectly solves the problems of poor return fluid and slow action of actuators caused by the "two-way throttling" of traditional fixed damping joints, effectively shortening the action time of hydraulic support lifting and moving, and improving production efficiency.

[0016] 2. This utility model adapts and fits the sealing ring to the inner wall of the conical cavity. When the emulsion flows along the "damping direction", it can completely seal the gap between the conical valve and the conical cavity, forcing the fluid to pass only through the damping hole at the central axis, avoiding throttling failure caused by gap leakage, and achieving "one-way precise flow control".

[0017] 3. This utility model uses a low-stiffness soft spring for the reset spring, and its elastic coefficient is precisely designed. When the emulsion flows along the "conduction direction", the fluid pressure can easily push the conical valve and the main valve core to compress the spring synchronously, so that the conical valve separates from the conical cavity to form a large flow gap. At the same time, the multiple through holes surrounding the side wall of the main valve core are connected to the inner cavity of the main valve core, so that the emulsion can quickly flow out of the connector valve body through the inner cavity of the end cap and the positioning screw plug.

[0018] 4. The valve core units of the return damping connector and the inlet damping connector of this utility model are exactly the same. The "return" and "inlet" functions are distinguished only by adjusting the coaxial connection sequence of the fine cavity, conical cavity, coarse cavity and threaded hole in the valve body of the connector. The parts have a high degree of interchangeability, which is convenient for mass production and reduces manufacturing costs. Attached Figure Description

[0019] Figure 1 This is a front view cross-sectional structural diagram of the return fluid damping joint of this utility model; Figure 2 This is a front view cross-sectional structural diagram of the fluid channel of this utility model; Figure 3 This is a front view cross-sectional structural diagram of the liquid inlet damping connector of this utility model; Figure 4 This is a front view cross-sectional view of the fluid channel 2 of this utility model.

[0020] In the diagram: 1. Connector valve body, 11. Fine cavity, 12. Conical cavity, 13. Coarse cavity, 14. Threaded hole, 2. Positioning plug, 3. End cap, 4. Return spring, 5. Main valve core, 6. Sealing ring, 7. Conical valve, 71. Damping hole, 8. Fluid channel one, 9. Fluid channel two. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figure 1-2 This utility model provides a technical solution for a return fluid damping joint for a hydraulic support: according to Figure 1 and Figure 2 As shown, it includes a connector valve body 1 and a valve core unit. A fluid channel 8 is provided through the connector valve body 1. The fluid channel 8 is composed of a thin cavity 11, a conical cavity 12, a coarse cavity 13 and a threaded hole 14 connected coaxially 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 8, so that the emulsion is in a conducting state when flowing in from the upper end of the fluid channel 8 and in a damped state when flowing in from the lower end.

[0024] The valve core unit includes a positioning screw plug 2, an end cap 3, a return spring 4, a main valve core 5, and a conical valve 7. The positioning screw plug 2 is threaded into the threaded hole 14. The conical valve 7 is adapted and installed in the conical cavity 12. A damping hole 71 is opened through the central axis of the conical valve 7. An annular sealing groove is opened on the outer peripheral wall of the conical valve 7. A sealing ring 6 is embedded in the sealing groove. The outer peripheral surface of the sealing ring 6 is adapted and fitted to the inner wall of the conical cavity 12. The sealing ring 6 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 7 and the conical cavity 12, forcing the fluid to pass only through the damping hole 71 at the central axis, avoiding throttling failure caused by gap leakage, and realizing "one-way precise flow control".

[0025] End cap 3, return spring 4, and main valve core 5 are arranged sequentially along the direction from positioning screw 2 to conical valve 7. End cap 3 abuts against positioning screw 2, and main valve core 5 abuts against conical valve 7. The two ends of return spring 4 elastically abut against end cap 3 and main valve core 5, respectively. Return spring 4 is a low-stiffness soft spring. The elastic coefficient of the soft spring satisfies the following: when the emulsion flows along the conduction direction, the pressure of the emulsion acting on the end face of conical valve 7 can push conical valve 7 and main valve core 5 to synchronously compress return spring 4, so that conical valve 7 separates from the conical surface of conical cavity 12 to form a flow gap.

[0026] The main valve core 5 is adapted to be installed in the coarse cavity 13 and can slide up and down along the coarse cavity 13. Multiple through holes are arranged around the side wall of the main valve core 5, so that the emulsion in the flow channel 8 can enter the inner cavity of the main valve core 5 through multiple through holes. Each through hole is connected to the inner cavity of the main valve core 5, and the inner cavity of the main valve core 5, the inner cavity of the end cap 3, and the inner cavity of the positioning screw plug 2 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 1 through the inner cavities of the end cap 3 and the positioning screw plug 2.

[0027] Please see Figure 3-4 This utility model provides a technical solution for a return fluid damping joint for a hydraulic support: according to Figure 3 and Figure 4 As shown, the connector valve body 1 and the valve core unit are connected. A fluid channel 2 9 is provided through the connector valve body 1. The fluid channel 2 9 is composed of a threaded hole 14, a coarse cavity 13, a conical cavity 12 and a fine cavity 11 connected coaxially from top to bottom along the preset conduction direction of the emulsion.

[0028] The valve core unit is adapted and assembled in the fluid channel 2 9, so that the emulsion is in a damped state when flowing in from the upper end of the fluid channel 2 9 and in a conductive state when flowing in from the lower end.

[0029] The valve core unit includes a positioning screw plug 2, an end cap 3, a return spring 4, a main valve core 5, and a conical valve 7. The positioning screw plug 2 is threaded into the threaded hole 14. The conical valve 7 is adapted to be installed in the conical cavity 12. A damping hole 71 is provided through the central axis of the conical valve 7. An annular sealing groove is provided on the outer peripheral wall of the conical valve 7. A sealing ring 6 is embedded in the sealing groove. The outer peripheral surface of the sealing ring 6 is adapted to fit the inner wall of the conical cavity 12. The sealing ring 6 is an O-ring made of nitrile rubber.

[0030] End cap 3, return spring 4, and main valve core 5 are arranged sequentially along the direction from positioning screw 2 to conical valve 7. End cap 3 abuts against positioning screw 2, and main valve core 5 abuts against conical valve 7. The two ends of return spring 4 elastically abut against end cap 3 and main valve core 5 respectively. Return spring 4 is a low-stiffness soft spring.

[0031] The main valve core 5 is adapted to be installed in the coarse cavity 13 and can slide up and down along the coarse cavity 13. Multiple through holes are arranged around the side wall of the main valve core 5, so that the emulsion in the flow channel 2 9 can enter the inner cavity of the main valve core 5 through multiple through holes. Each through hole is connected to the inner cavity of the main valve core 5, and the inner cavity of the main valve core 5, the inner cavity of the end cap 3, and the inner cavity of the positioning screw plug 2 are connected in sequence to form an internal channel for the flow of emulsion.

[0032] This invention, by setting a return damping joint and an inlet damping joint, allows the emulsion to flow in a preset direction. When the emulsion flows, the fluid pressure can overcome the elastic force of the return spring 4, opening the contact surface between the conical valve 7 and the conical cavity 12, forming a smooth flow channel with almost no obstruction. When the emulsion flows in the opposite direction, the conical valve 7 contacts the conical cavity 12 under the action of the return spring 4 and the fluid pressure. At this time, the sealing ring 6 plays a sealing role, and the emulsion can only pass through the tiny damping hole 71, producing a significant throttling effect. This "one-way throttling and reverse smooth flow" characteristic perfectly solves the problems of poor return fluid and slow action of actuators caused by the "two-way throttling" of traditional fixed damping joints, effectively shortening the action time of hydraulic support lifting and moving, and improving production efficiency.

Claims

1. A return damping joint for a hydraulic support, comprising a joint valve body and a valve core unit, characterized in that: The valve body of the connector has a fluid channel that runs through it. The fluid channel is composed of a thin cavity, a conical cavity, a coarse cavity and a threaded hole connected coaxially from top to bottom along the preset conduction direction of the emulsion. The valve core unit is adapted to be assembled in the fluid channel one, so that the emulsion is in a conducting state when flowing in from the upper end of the fluid channel one and in a damped state when flowing in from the lower end. The valve core unit includes a positioning screw plug, an end cap, a return spring, a main valve core, and a conical valve. The positioning screw plug is threaded into a threaded hole, and the conical valve is adapted to be installed in a conical cavity. A damping hole is provided through the central axis of the conical valve. The end cap, return spring, and main valve core are arranged sequentially along the direction from the positioning screw plug to the conical valve, with the end cap abutting against the positioning screw plug, the main valve core abutting against the conical valve, and the two ends of the return spring elastically abutting against the end cap and the main valve core, respectively. The main valve core is adapted to be installed in the coarse cavity and can slide up and down along the coarse cavity. Multiple through holes are arranged around the side wall of the main valve core. Each through hole is connected to the inner cavity of the main valve core. The inner cavity of the main valve core, the inner cavity of the end cap, and the inner cavity of the positioning screw plug are connected in sequence to form an internal channel for the flow of emulsion.

2. The return fluid damping joint for a hydraulic support according to claim 1, characterized in that: The outer peripheral wall of the conical valve is provided with an annular sealing groove, and a sealing ring is embedded in the sealing groove. The outer peripheral surface of the sealing ring is adapted to fit the inner wall of the conical cavity.

3. The return fluid damping joint for a hydraulic support according to claim 1, characterized in that: The reset spring is a low-stiffness soft spring.

4. The return fluid damping joint for a hydraulic support according to claim 2, characterized in that: The sealing ring is an O-ring made of nitrile rubber.

5. A hydraulic inlet damping connector for a hydraulic support, comprising a connector valve body and a valve core unit, characterized in that: The valve body of the connector has a second fluid channel that runs through it. The second fluid channel is composed of a threaded hole, a coarse cavity, a conical cavity and a fine cavity that are coaxially connected from top to bottom along the preset conduction direction of the emulsion. The valve core unit is adapted to be assembled in the fluid channel two, so that the emulsion is in a damped state when flowing in from the upper end of the fluid channel two and in a conductive state when flowing in from the lower end. The valve core unit includes a positioning screw plug, an end cap, a return spring, a main valve core, and a conical valve. The positioning screw plug is threaded into a threaded hole, and the conical valve is adapted to be installed in a conical cavity. A damping hole is provided through the central axis of the conical valve. The end cap, return spring, and main valve core are arranged sequentially along the direction from the positioning screw plug to the conical valve, with the end cap abutting against the positioning screw plug, the main valve core abutting against the conical valve, and the two ends of the return spring elastically abutting against the end cap and the main valve core, respectively. The main valve core is adapted to be installed in the coarse cavity and can slide up and down along the coarse cavity. Multiple through holes are arranged around the side wall of the main valve core. Each through hole is connected to the inner cavity of the main valve core. The inner cavity of the main valve core, the inner cavity of the end cap, and the inner cavity of the positioning screw plug are connected in sequence to form an internal channel for the flow of emulsion.

6. The inlet damping joint for a hydraulic support according to claim 5, characterized in that: The outer peripheral wall of the conical valve is provided with an annular sealing groove, and a sealing ring is embedded in the sealing groove. The outer peripheral surface of the sealing ring is adapted to fit the inner wall of the conical cavity.

7. The inlet damping joint for a hydraulic support according to claim 5, characterized in that: The reset spring is a low-stiffness soft spring.

8. The inlet damping joint for a hydraulic support according to claim 6, characterized in that: The sealing ring is an O-ring made of nitrile rubber.

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