Pushing oil cylinder speed regulation control system

Abstract

The utility model discloses a speed regulation control system for a pushing oil cylinder. The speed regulation control system comprises the pushing oil cylinder, a reversing valve, a speed regulation valve, a pushing one-way valve and an electromagnetic pilot operated valve, the reversing valve controls liquid inlet and liquid return of the pushing oil cylinder, and the speed regulating valve controls the liquid flow speed of the rodless cavity. The one-way valve is pushed to control liquid feeding and liquid returning of the rod cavity; the electromagnetic pilot valve is connected with the speed regulating valve through a first control pipeline to control the working state of the speed regulating valve, the electromagnetic pilot valve is connected with the pushing one-way valve through a second control pipeline to control the working state of the pushing one-way valve, and the electromagnetic pilot valve is connected with a third pipeline and connected to the alternating valve through the other end of the third pipeline. Control liquid does not need to be introduced from the outside, the self-unlocking function can be achieved, then sequential control over pushing of the one-way lock is achieved, and the opening frequency of a pushing safety valve in the frame pulling process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic supports used in fully mechanized mining working faces in underground coal mines, in particular to a speed regulation control system for a push oil cylinder. Background Art

[0002] Coal mining is a comprehensive mechanized operation, and hydraulic supports are used to support the roof. The pushing and pulling of the hydraulic supports are completed by the hydraulic support push cylinder. The existing hydraulic supports will have the following technical defects when working: 1. The safety valve of the hydraulic support push cylinder for coal mines is frequently opened, causing large-scale damage. 2. The problem of precise control of the pushing and pulling of the hydraulic support for coal mines. 3. The connecting pin of the hydraulic support push cylinder for coal mines is deformed and damaged. The reasons for the above problems are: 1. When the hydraulic support for coal mines performs the pulling action, the pushing one-way lock is not unlocked in time, resulting in the frequent pressure-blocking opening of the safety valve, and then the problem of large-scale damage. 2. When the hydraulic support performs the pushing and pulling action, the hydraulic impact is too large, and the impact shear force on the connecting pin of the component is too large, which is prone to pin deformation or even breakage. Summary of the Invention

[0003] The present utility model aims to address the aforementioned issues by providing a speed control system for a push cylinder. First, it achieves sequential control of the push lock, reducing the number of times the push safety valve is opened during the rack extension process. Second, it achieves speed control of the push cylinder. Third, it solves the problem of fracture and deformation of the pin connecting the push cylinder to other components.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] A speed control system for a push cylinder, comprising:

[0006] The push cylinder comprises a rod chamber and a rodless chamber, and a first pipeline and a second pipeline respectively connected to the rod chamber and the rodless chamber, wherein the first pipeline and the second pipeline are connected to the oil tank via a reversing valve;

[0007] A speed regulating valve is provided on the first pipeline to control the liquid inlet and liquid return flow of the rodless chamber; controls the liquid inlet and liquid return of the rodless chamber and controls the liquid flow rate of the rodless chamber during liquid return;

[0008] A push-type one-way valve is provided on the second pipeline to control the liquid inflow and liquid return to the rod chamber and to limit the flow direction of the liquid in the rod chamber, thereby controlling the liquid inflow and liquid return to the rod chamber;

[0009] an alternating valve and an alternating communication pipeline connected to the alternating valve, wherein one end of the alternating communication pipeline is connected to the outlet of the rod chamber so as to form a parallel pipeline with the second pipeline, and the other end of the alternating communication pipeline is connected to the first pipeline at the outlet of the speed regulating valve;

[0010] An electromagnetic pilot valve and a first control pipeline, a second control pipeline, and a third pipeline connected to the electromagnetic pilot valve. The first control pipeline is connected to the speed regulating valve to control the working state of the speed regulating valve. The second control pipeline is connected to the push check valve to control the working state of the push check valve. The other end of the third pipeline is connected to the alternating valve.

[0011] As an improvement to the above technical solution, the control port of the push-type one-way valve is connected to a third control pipeline, forming a parallel pipeline with the second control pipeline, and the other end of the third control pipeline is connected to the first pipeline at the outlet of the speed control valve.

[0012] As an improvement to the above technical solution, the electromagnetic pilot valve is composed of two two-position three-way valves connected in parallel, the reversing valve is a three-position four-way valve, and the speed regulating valve is a two-position two-way valve.

[0013] As an improvement to the above technical solution, the outlet of the rod chamber is further connected to an oil outlet pipeline controlled by a safety valve;

[0014] As an improvement to the above technical solution, a filter is provided on the third pipeline.

[0015] As an improvement to the above technical solution, the electromagnetic pilot valve is provided with a liquid return path connected to the oil tank.

[0016] As an improvement to the above technical solution, the oil tank is connected to the reversing valve via two pipelines, and a power source is provided on one of the pipelines.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are:

[0018] This utility model does not require external control fluid and utilizes electromagnetic pilot valve control to simultaneously achieve speed regulation and unlocking functions, thereby achieving sequential control of the push-type one-way lock, reducing the number of times the push-type safety valve is opened during the rack pulling process. Simultaneously, speed regulation of the push cylinder prevents breakage and deformation of the pin connecting the push cylinder to other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 This is a schematic diagram of the system structure of the utility model;

[0021] Figure 2This is a schematic diagram of the oil flow for a mining hydraulic support performing a push-and-slide action;

[0022] Figure 3 This is a schematic diagram of the oil flow before the mining hydraulic support performs the pulling action;

[0023] Figure 4 Schematic diagram of the oil flow for a mining hydraulic support to perform the pulling action.

[0024] Figure numerals: 1. Power source; 2. Reversing valve; 3. Alternating valve; 4. Filter; 5. Solenoid pilot valve; 6. Speed ​​regulating valve; 7. Push cylinder; 8. Safety valve; 9. Push check valve; 10. First pipeline 10; 11. Second pipeline; 12. Alternating connecting pipeline; 13. First control pipeline; 14. Second control pipeline; 15. Third control pipeline; 16. Third pipeline. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0026] like Figures 1 to 4 As shown, this embodiment discloses a push cylinder speed control system, which includes a power source 1, a reversing valve 2, an alternating valve 3, a filter 4, an electromagnetic pilot valve 5, a speed control valve 6, a push cylinder 7, a safety valve 8, and a push check valve 9.

[0027] The push cylinder 7 has a rod chamber and a rodless chamber, each connected to a first pipeline 10 and a second pipeline 11, respectively. The first pipeline 10 and the second pipeline 11 are connected to the oil tank via a reversing valve 2. The speed regulating valve 6 is installed on the first pipeline 10 to control the inflow and return of liquid to the rodless chamber and the liquid flow rate during the return flow. By controlling the inflow and return flow of liquid to the rodless chamber, the speed of pushing and pulling the bracket is controlled. The push check valve 9 is installed on the second pipeline 11 to control the inflow and return of liquid to the rodless chamber.

[0028] The alternating valves 3 are connected to each other via an alternating communication line 12. One end of the alternating communication line 12 (i.e., the communication line 12 at the front end of the alternating valve 3) is connected to the outlet of the rod chamber, forming a parallel line with the second line 11. The other end of the alternating communication line 12 (i.e., the communication line 12 at the rear end of the alternating valve 3) is connected to the first line 10 at the outlet of the speed regulating valve 6, so that the oil after passing through the alternating valve 3 is merged into the first line 10 at the rear end of the speed regulating valve 6.

[0029] The solenoid pilot valve 5, the first control pipeline 13, the second control pipeline 14, and the third pipeline 16 connected to the solenoid pilot valve 5, the first control pipeline 13 is connected to the speed control valve 6 to control the working state of the speed control valve 6, the second control pipeline 14 is connected to the push check valve 9 to control the working state of the push check valve 9, and the other end of the third pipeline 16 is connected to the alternating valve 4.

[0030] The control port of the push-type check valve 9 is connected to a third control line 15, forming a parallel line with the second control line 14. The other end of the third control line 15 is connected to the first line 10 at the outlet of the speed control valve 6. The solenoid pilot valve 5 is composed of two two-position, three-way valves connected in parallel. The reversing valve 2 is a three-position, four-way valve, and the speed control valve 6 is a two-position, two-way valve. The outlet of the rod chamber is also connected to an oil outlet line controlled by the safety valve 8; a filter 4 is installed on the third line 16. The solenoid pilot valve 5 is provided with a return line connected to the fuel tank. The fuel tank is connected to the reversing valve 2 by two lines, one of which is equipped with a power source 1.

[0031] like Figure 2 、 3 As shown in Figure 4, when the mining hydraulic support is performing a pushing and sliding action, the reversing valve 2 functions in the left position. Simultaneously, the solenoid pilot valve 5 receives a control signal to function in the left position, controlling the speed regulating valve 6 via the first control line 13. The speed regulating valve 6 functions in the right position, slowing the hydraulic support's movement and reducing the initial hydraulic impact force. When the control signal from the solenoid pilot valve 5 is removed, the right chamber (rod chamber) of the push cylinder 7 begins to flow normally. The power source 1 continuously supplies oil to the rod chamber of the push cylinder 7 via the reversing valve 2, the second line 11, and the push check valve 9. At this point, the speed regulating valve 6 functions in the left position, and the left chamber (rodless chamber) begins to return normally. In this state, electronic control fluid flows through the alternating connecting line 12, the alternating valve 3, the third line 16, and the first control line 13. The filter 4 filters the flow of electronic control fluid to ensure its purity.

[0032] Before the hydraulic support reaches the designated position, the solenoid pilot valve 5 is controlled to execute the left position function to control the speed regulating valve 6, and the speed regulating valve 6 executes the right position function. The return flow of the rodless chamber of the push cylinder 7 is reduced, slowing the movement of the hydraulic support, thereby achieving precise pushing and sliding of the mining hydraulic support while avoiding the impact of the connecting pin. In this state, the alternating connecting line 12, the alternating valve 3, the third line 16, and the second control line 14 contain electronic control fluid. The filter 4 filters the flow of electronic control fluid to ensure its purity.

[0033] When the mining hydraulic support performs the pulling action, before the reversing valve 2 performs the right function, the reversing valve 2 performs the middle function, and the liquid in the rod chamber of the pushing cylinder 7 is supplied to the electromagnetic pilot valve 5 through the alternating connecting pipe 12. The electromagnetic pilot valve 5 receives the control signal to perform the right function, and the pushing check valve 9 is unlocked through the second control pipe 14. The rod chamber returns liquid through the pushing check valve 9 and the second pipe 11, thereby avoiding pressure buildup in the rod chamber of the pushing cylinder and avoiding the problem of frequent opening of the safety valve when the pushing cylinder performs the pulling action.

[0034] Then, the control signal of the electromagnetic pilot valve 5 is canceled, the reversing valve 2 performs the right position function, and the power source 1 delivers liquid to the rodless chamber through the reversing valve 2 via the first pipeline 10. The left chamber of the push cylinder 7, i.e., the rodless chamber, normally flows liquid, and the right chamber, i.e., the rod chamber, normally returns liquid. Before the hydraulic support reaches the specified position, the electromagnetic pilot valve 5 is controlled to perform the left position function to control the speed regulating valve 6, reducing the flow rate of liquid into the rod chamber of the push cylinder 7, slowing the movement speed of the hydraulic support, thereby achieving precise pulling of the mining hydraulic support and avoiding the impact of the connecting pin shaft. In this state, there is electronic control fluid in the third pipeline 16 and the first control pipeline 13.

[0035] The improvements of the present invention over the prior art are as follows:

[0036] 1. Introduce the electromagnetic pilot valve control system, and introduce the push cylinder lock chamber into the electromagnetic pilot valve inlet chamber through the flow channel design, so as to realize electro-hydraulic control and self-unlocking control at the same time.

[0037] 2. The push-type one-way lock control chamber is designed with a double-stage unlocking structure, which can realize self-control and liquid introduction control.

[0038] 3. Link the other control port of the electromagnetic pilot valve with the speed control valve assembly so that the system has both self-unlocking control and the speed control function of the push cylinder.

[0039] The technical effects of the utility model include the following:

[0040] 1. When the hydraulic support for coal mines performs the pulling action, liquid enters the rodless chamber of the push cylinder, and the rod chamber is unlocked and liquid returns, realizing the extension of the piston rod of the push cylinder, and then realizing the pulling action of the hydraulic support.

[0041] In the actual process of hydraulic support extension in coal mines, the problem of delayed unlocking of the push check lock, resulting in pressure buildup in the rod chamber of the push cylinder, and frequent opening of the safety valve, which can cause damage. To solve this problem, before the hydraulic support extension is performed, the solenoid pilot valve is controlled to open the right control port. The solenoid pilot valve unlocks the push check valve in advance, thereby preventing pressure buildup in the rod chamber of the push cylinder and the frequent opening of the safety valve when the push cylinder is performing the extension action.

[0042] 2. Hydraulic supports used in coal mines experience high pumping station pressure and high flow rates. During push-and-pull operations, the connecting pins between the push cylinder and the hydraulic support are subjected to significant impact, which can easily cause deformation and breakage. Furthermore, precise control of the hydraulic support during push-and-pull operations can be difficult.

[0043] To address this issue, before the initial and final actions of pulling and pushing a hydraulic support in a coal mine, the solenoid pilot valve opens the left control port, controlling the oil control speed regulating valve to perform a speed regulation function, slowing the hydraulic support and reducing the initial hydraulic impact force. Furthermore, this allows for precise pushing and pulling of the hydraulic support.

[0044] 3. Through the flow channel design, the liquid in the rod chamber of the push cylinder is supplied to the electromagnetic pilot valve, which uses it as the control fluid to unlock the push check valve. This enables the coal mine hydraulic support to have a self-unlocking function when performing the frame pulling action.

[0045] In summary, the utility model utilizes electromagnetic pilot valve control, does not require external introduction of control fluid, can realize self-unlocking function, and can realize speed regulation and unlocking functions at the same time.

Claims

1. A speed control system for a push cylinder, characterized by: include: The push cylinder comprises a rod chamber and a rodless chamber, and a first pipeline and a second pipeline respectively connected to the rod chamber and the rodless chamber, wherein the first pipeline and the second pipeline are connected to the oil tank via a reversing valve; A speed regulating valve is provided on the first pipeline to control the liquid inlet and liquid return of the rodless chamber and to control the liquid flow rate of the rodless chamber during liquid return; A push-type one-way valve is provided on the second pipeline to control the liquid inflow and liquid return to the rod chamber; an alternating valve and an alternating communication pipeline connected to the alternating valve, wherein one end of the alternating communication pipeline is connected to the outlet of the rod chamber so as to form a parallel pipeline with the second pipeline, and the other end of the alternating communication pipeline is connected to the first pipeline at the outlet of the speed regulating valve; An electromagnetic pilot valve and a first control pipeline, a second control pipeline, and a third pipeline connected to the electromagnetic pilot valve. The first control pipeline is connected to the speed regulating valve to control the working state of the speed regulating valve. The second control pipeline is connected to the push check valve to control the working state of the push check valve. The other end of the third pipeline is connected to the alternating valve.

2. The push cylinder speed control system according to claim 1, characterized in that: The control port of the push check valve is connected to a third control pipeline, forming a parallel pipeline with the second control pipeline. The other end of the third control pipeline is connected to the first pipeline at the outlet of the speed regulating valve.

3. The push cylinder speed control system according to claim 2, characterized in that: The electromagnetic pilot valve is formed by two two-position three-way valves connected in parallel, the reversing valve is a three-position four-way valve, and the speed regulating valve is a two-position two-way valve.

4. The push cylinder speed control system according to claim 1, characterized in that: The outlet of the rod chamber is also connected to an oil outlet pipeline controlled by a safety valve.

5. The push cylinder speed control system according to claim 1, characterized in that: The third pipeline is provided with a filter.

6. The push cylinder speed control system according to claim 1, characterized in that: The electromagnetic pilot valve is provided with a liquid return path connected to the oil tank.

7. The push cylinder speed control system according to claim 1, characterized in that: The oil tank is connected to the reversing valve via two pipelines, and a power source is arranged on one of the pipelines.

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