Hydraulic support thrust mechanism service life test device and method

Abstract

A hydraulic support thrust mechanism service life test device comprises a frame, a damping jack, a damping valve group, a tested hydraulic support, a liquid supply pump station and a control system. The damping jack is hinged between the frame and a push rod of the tested hydraulic support, and the damping jack is passively telescopic and used for generating resistance. The damping valve group is respectively connected with upper and lower cavities of the damping jack; the tested hydraulic support is placed on the frame and is limited to move by a limiting structure arranged on the frame; the liquid supply pump station is connected with the damping jack and the tested hydraulic support pushing mechanism through a hydraulic loop and used for supplying liquid to the damping jack and supplying liquid to the pushing jack and the bottom lifting jack of the tested hydraulic support. The control system is in signal connection with the tested hydraulic support pushing mechanism. The actual stress condition and the action sequence of the underground thrust mechanism can be truly simulated, and the whole service life of the hydraulic support thrust mechanism can be tested.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic support testing, and in particular to a hydraulic support pushing mechanism life testing device and method. Background Art

[0002] The hydraulic support push mechanism usually refers to a mechanism composed of a push jack, a push rod and a bottom lifting jack. The push mechanism is an important component of the hydraulic support and is the executive component of the hydraulic support to complete the work of pushing, lifting and moving the frame. The quality of the push mechanism directly affects the service life of the hydraulic support.

[0003] At present, most of the test devices for hydraulic supports can only complete the strength test of the push cylinder and the push rod or the durability test of the push cylinder alone. However, there are few life test devices and methods for the entire push mechanism of the hydraulic support.

[0004] Chinese invention patent CN2021116229449 discloses a test push-pull frame device and its use method, the test push-pull frame device includes a hydraulic support, a push device and a test bench, the hydraulic support can be slidably arranged on the test bench, a scraper is connected to one side of the hydraulic support, the push device includes a fixed jack and a push jack, the push jack is installed on the hydraulic support, the piston rod of the push jack is connected to the scraper, the fixed jack is installed on the test bench, and the piston rod of the fixed jack is connected to the side of the hydraulic support away from the scraper. The test push-pull frame device is suitable for simulating working conditions where there is no hydraulic support top connection condition on the well, does not affect the original control logic, and has the advantage of good controllability. However, the test push-pull frame device only simulates the propulsion action of the hydraulic support, and cannot truly simulate the actual force condition and action sequence of the hydraulic support push mechanism in the well, and it is also impossible to test the overall life of the hydraulic support push mechanism. Summary of the invention

[0005] The actions performed by the hydraulic support pushing mechanism in actual use underground are pushing, lifting the bottom, and moving the frame, and these three actions are repeated in a cycle. In order to more realistically simulate the actual force conditions and action sequence of the underground pushing mechanism and realize the test of the overall life of the hydraulic support pushing mechanism, the present invention provides a hydraulic support pushing mechanism life test device and method.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hydraulic support pushing mechanism life test device, including a frame, a damping jack, a damping valve group, a tested hydraulic support, a liquid supply pump station and a control system; The damping jack is hinged between the frame and the push rod of the tested hydraulic support. The damping jack is passively extended and retracted to generate resistance to simulate the force on the pushing mechanism of the tested hydraulic support when pushing or moving the support. The damping valve group is connected to the upper and lower chambers of the damping jack respectively, and the resistance generated by the damping jack meets the requirements of the corresponding pushing force and frame moving force through the set pressure of the damping valve group; The tested hydraulic support is placed on the frame and its movement is restricted by the limiting structure arranged on the frame; The liquid supply pump station is respectively connected with the damping jack and the pushing mechanism of the tested hydraulic support through a hydraulic circuit, and is used to replenish liquid to the damping jack, and supply liquid to the pushing jack and the bottom lifting jack of the tested hydraulic support; The control system is connected with the signal of the pushing mechanism of the tested hydraulic support and is used for controlling the movement of the pushing jack and the bottom lifting jack of the tested hydraulic support.

[0007] Based on the above, the damping valve group includes a lower chamber overflow valve, an upper chamber overflow valve and a hydraulic two-way lock; The lower chamber overflow valve is connected to the lower chamber of the damping jack. The lower chamber overflow valve is used to set the pressure that meets the push-slide force. When the pressure in the lower chamber of the damping jack reaches the set pressure of the lower chamber overflow valve, the liquid in the lower chamber of the damping jack is discharged through the lower chamber overflow valve. The upper chamber relief valve is connected to the upper chamber of the damping jack. When the pressure in the upper chamber of the damping jack reaches the set pressure of the upper chamber relief valve, the liquid in the upper chamber of the damping jack is discharged through the upper chamber relief valve. The hydraulic two-way lock is installed on the hydraulic circuit of the damping jack to prevent the liquid in the upper and lower chambers of the damping jack from being discharged through the hydraulic circuit of the damping jack.

[0008] Based on the above, pressure sensors are installed in the upper and lower chambers of the push jack and the damping jack respectively. The control system reads and records the pressure values ​​of the upper and lower chambers of the push jack and the damping jack respectively in real time during the test through the corresponding pressure sensors.

[0009] By adopting the above technical scheme, a test method for a life test device of a hydraulic support pushing mechanism includes the following steps: first, the magnitude of the force exerted on the pushing mechanism during pushing and sliding and frame shifting is calculated, and then the set pressure of the damping valve group is set so that the resistance generated by the damping jack meets the requirements of the pushing and sliding force and the frame shifting force; then the control system controls the tested hydraulic support pushing mechanism to automatically cycle the actions of pushing the damping jack, lifting the bottom and pulling the damping jack, simulating the actions performed by the hydraulic support pushing mechanism during actual use underground, and then testing the life of the tested hydraulic support pushing mechanism; according to the test requirements, the life test is completed when the tested hydraulic support pushing mechanism automatically cycles the actions of pushing the damping jack, lifting the bottom and pulling the damping jack for a specified number of cycles; finally, the control system extracts the upper and lower cavity pressure values ​​of the pushing jack and the damping jack collected by each pressure sensor during the test, so as to analyze the pressure value data later.

[0010] Based on the above, the control system controls the tested hydraulic support pushing mechanism to automatically cycle through the actions of pushing the damping jack, lifting the bottom, and pulling the damping jack. Specifically, the actions are as follows: Step 1: Initially, the push jack is fully extended, the push rod is fully retracted, and the damping jack is in the extended state, simulating the state of being ready to push and slide; Step 2: The push jack is retracted, driving the push rod to extend, and the push rod pushes the damping jack to retract the damping jack, simulating the pushing and sliding action of the hydraulic support. During this process, the liquid in the lower chamber of the damping jack is compressed. When the liquid pressure in the lower chamber of the damping jack reaches the set pressure of the lower chamber relief valve, the liquid in the lower chamber of the damping jack is discharged through the lower chamber relief valve, and at the same time, the upper chamber of the damping jack is replenished with liquid through the hydraulic circuit; Step 3: Extend the bottom lifting jack to lift the front end of the base of the tested hydraulic support to realize the bottom lifting action of the hydraulic support and simulate the state of preparing to move the support; Step 4: The push jack is extended, driving the push rod to retract, and the push rod pulls the damping jack to extend the damping jack, simulating the hydraulic support moving action. During this process, the liquid in the upper chamber of the damping jack is compressed. When the liquid pressure in the upper chamber of the damping jack reaches the set pressure of the upper chamber relief valve, the liquid in the upper chamber of the damping jack is discharged through the upper chamber relief valve, and at the same time, the lower chamber of the damping jack is replenished with liquid through the hydraulic circuit; Step 5: Retract the bottom jack and return to the initial state of step 1 to prepare for the next cycle; Step 6: Repeat steps 2 to 5 to automatically complete the required number of cycles.

[0011] Compared with the prior art, the present invention has outstanding substantial features and remarkable progress. Specifically, the present invention drives the extension and retraction of the damping jack by extending and retracting the push jack of the tested support. The damping jack simulates the resistance during pushing and sliding and frame moving. At the same time, through the set pressure of the lower chamber overflow valve and the upper chamber overflow valve, the resistance generated by the damping jack can meet the requirements of the corresponding pushing and sliding force and frame moving force, and truly reflects the actual force of the underground pushing mechanism. Among them, the pushing and sliding action is realized by pushing the damping jack, the bottom lifting action is the same as underground, and the frame moving action is realized by pulling the damping jack. The overall test of the tested hydraulic support is more in line with the actual working conditions, and can truly simulate the actual force conditions and action sequence of the underground pushing mechanism, thereby realizing the test of the overall life of the hydraulic support pushing mechanism.

[0012] Furthermore, the tested hydraulic support is restricted in movement by the limit structure on the frame, and the frame moving action is achieved by retracting the push rod with additional force (resistance generated by the damping jack), thereby preventing the tested hydraulic support from moving forward and eliminating the action of resetting the tested hydraulic support. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a life test device for a hydraulic support pushing mechanism of the present invention.

[0014] Figure 2 yes Figure 1 Top view of the .

[0015] Figure 3 It is a schematic diagram of the tested hydraulic support of the present invention completing a simulated pushing and sliding action.

[0016] Figure 4 It is a schematic diagram of the tested hydraulic support of the present invention realizing the bottom lifting action and simulating the state of preparing to move the support.

[0017] Figure 5 It is a schematic diagram of the control principle of the hydraulic support pushing mechanism life test device of the present invention.

[0018] In the figure: 1. frame; 2. damping jack; 3. tested hydraulic support; 4. control system; 5. push rod; 6. push jack; 7. bottom lifting jack; 8. limit plate; 9. lower chamber overflow valve; 10. upper chamber overflow valve; 11. hydraulic two-way lock. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a hydraulic support pushing mechanism life test device includes a frame 1, a damping jack 2, a damping valve group, a tested hydraulic support 3, a liquid supply pump station and a control system 4; The damping jack 2 is hinged between the frame 1 and the push rod 5 of the tested hydraulic support 3. The damping jack 2 is passively extended and retracted to generate resistance to simulate the force on the pushing mechanism of the tested hydraulic support 3 when pushing or moving the frame; The damping valve group is connected to the upper and lower chambers of the damping jack 2 respectively, and the set pressure of the damping valve group makes the resistance generated by the damping jack 2 meet the requirements of the corresponding pushing and sliding force and the frame moving force; The tested hydraulic support 3 is placed on the frame 1 and is restricted in movement by a limiting structure arranged on the frame 1; The liquid supply pump station is respectively connected to the damping jack 2 and the pushing mechanism of the tested hydraulic support 3 through a hydraulic circuit, and is used to replenish liquid to the damping jack 2, and supply liquid to the pushing jack 6 and the bottom lifting jack 7 of the tested hydraulic support 3; The control system 4 is connected to the push mechanism signal of the tested hydraulic support 3 and is used to control the movement of the push jack 6 and the bottom lifting jack 7 of the tested hydraulic support 3.

[0021] In this embodiment, the damping jack 2 is arranged in the front side of the push rod 5 of the tested hydraulic support 3 along the front-to-back direction, the front end of the damping jack 2 is hinged to the frame 1 through a pin shaft, and the rear end of the damping jack 2 is hinged to the front end of the push rod 5 of the tested hydraulic support 3 through a pin shaft.

[0022] In this embodiment, the limiting structure is a limiting plate 8 welded on the frame 1 and located around the tested hydraulic support 3, which is used to limit the forward, backward, left and right movement of the tested hydraulic support 3.

[0023] The damping valve group includes a lower chamber overflow valve 9, an upper chamber overflow valve 10 and a hydraulic two-way lock 11; The lower chamber overflow valve 9 is connected to the lower chamber of the damping jack 2. The lower chamber overflow valve 9 is used to set the pressure that meets the push-slide force. When the pressure in the lower chamber of the damping jack 2 reaches the set pressure of the lower chamber overflow valve 9, the liquid in the lower chamber of the damping jack 2 is discharged through the lower chamber overflow valve 9. The upper chamber relief valve 10 is connected to the upper chamber of the damping jack 2. When the pressure in the upper chamber of the damping jack 2 reaches the set pressure of the upper chamber relief valve 10, the liquid in the upper chamber of the damping jack 2 is discharged through the upper chamber relief valve 10. The hydraulic two-way lock 11 is installed on the hydraulic circuit of the damping jack 2 to prevent the liquid in the upper and lower chambers of the damping jack 2 from being discharged through the hydraulic circuit of the damping jack 2 .

[0024] Pressure sensors are installed in the upper and lower chambers of the push jack 6 and the damping jack 2 respectively. The control system 4 reads and records the pressure values ​​of the upper and lower chambers of the push jack 6 and the damping jack 2 respectively in real time during the test through the corresponding pressure sensors.

[0025] By adopting the above technical scheme, a test method for a life test device of a hydraulic support pushing mechanism includes the following steps: first, the magnitude of the force exerted on the pushing mechanism during pushing and sliding and frame shifting is calculated, and then the set pressure of the damping valve group is set so that the resistance generated by the damping jack 2 meets the requirements of the pushing force and frame shifting force, and then the control system 4 controls the tested hydraulic support 3 pushing mechanism to automatically cycle the actions of pushing the damping jack 2, lifting the bottom and pulling the damping jack 2, simulating the actions performed by the hydraulic support pushing mechanism during actual use underground, and then testing the life of the tested hydraulic support 3 pushing mechanism, and according to the test requirements, the life test is completed when the tested hydraulic support 3 pushing mechanism automatically cycles the actions of pushing the damping jack 2, lifting the bottom and pulling the damping jack 2 for a specified number of cycles, and finally, the control system 4 is used to extract the upper and lower cavity pressure values ​​of the pushing jack 6 and the damping jack 2 collected by each pressure sensor during the test, so as to analyze the pressure value data later.

[0026] The control system 4 controls the pushing mechanism of the tested hydraulic support 3 to automatically and cyclically execute the actions of pushing the damping jack 2, lifting the bottom and pulling the damping jack 2. Specifically, the actions are as follows: Step 1: Initially, the push jack 6 is fully extended, the push rod 5 is fully retracted, and the damping jack 2 is in an extended state, simulating a state of being ready to push and slide; Step 2: The push jack 6 is retracted, driving the push rod 5 to extend, and the push rod 5 pushes the damping jack 2 to retract the damping jack 2, simulating the pushing and sliding action of the hydraulic support. During this process, the liquid in the lower chamber of the damping jack 2 is compressed. When the liquid pressure in the lower chamber of the damping jack 2 reaches the set pressure of the lower chamber relief valve 9, the liquid in the lower chamber of the damping jack 2 is discharged through the lower chamber relief valve 9, and at the same time, the upper chamber of the damping jack 2 is replenished with liquid through the hydraulic circuit; Step 3: The bottom lifting jack 7 is extended to lift the front end of the base of the tested hydraulic support 3, so as to realize the bottom lifting action of the hydraulic support and simulate the state of preparing to move the support; Step 4: The push jack 6 extends, driving the push rod 5 to retract, and the push rod 5 pulls the damping jack 2 to extend the damping jack 2, simulating the hydraulic support moving action. During this process, the liquid in the upper chamber of the damping jack 2 is compressed. When the liquid pressure in the upper chamber of the damping jack 2 reaches the set pressure of the upper chamber relief valve 10, the liquid in the upper chamber of the damping jack 2 is discharged through the upper chamber relief valve 10, and at the same time, the lower chamber of the damping jack 2 is replenished with liquid through the hydraulic circuit; Step 5: The bottom lifting jack 7 is retracted and returns to the initial state of step 1, preparing for the next cycle; Step 6: Repeat steps 2 to 5 to automatically complete the required number of cycles.

[0027] In this embodiment, the control system 4 is a PLC or a single chip microcomputer, and the movement of the push jack 6 and the bottom lifting jack 7 of the tested hydraulic support 3 is controlled by the PLC or the single chip microcomputer.

[0028] In other embodiments, two damping jacks 2 can be arranged, respectively set on the front and rear sides of the tested hydraulic support 3, the two ends of the damping jack 2 on the front side are respectively hinged to the frame 1 and the front end of the push rod 5 of the tested hydraulic support 3, and the two ends of the damping jack 2 on the rear side are respectively hinged to the frame 1 and the rear end of the push rod 5 of the tested hydraulic support 3.

[0029] The damping jack 2 can also be replaced by a spring or other damping device that can generate resistance.

[0030] It should be noted that the damping valve group is an electrically controlled valve group or an ordinary valve group, that is, the lower chamber overflow valve 9 and the upper chamber overflow valve 10 can be electromagnetic overflow valves or ordinary overflow valves. If the lower chamber overflow valve 9 and the upper chamber overflow valve 10 are electromagnetic overflow valves, the set pressures of the lower chamber overflow valve 9 and the upper chamber overflow valve 10 can be adjusted through the control system. If the lower chamber overflow valve 9 and the upper chamber overflow valve 10 are ordinary overflow valves, the overflow valves with different set pressures can be directly replaced to adjust the set pressures of the lower chamber overflow valve 9 and the upper chamber overflow valve 10, thereby setting the set pressure of the damping valve group and ensuring that the resistance generated by the damping jack 2 meets the requirements of the corresponding pushing force and frame shifting force.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A hydraulic support pushing mechanism life test device, characterized in that: It includes a frame, a damping jack, a damping valve group, a tested hydraulic support, a fluid supply pump station and a control system; The damping jack is hinged between the frame and the push rod of the tested hydraulic support. The damping jack is passively extended and retracted to generate resistance to simulate the force on the pushing mechanism of the tested hydraulic support when pushing or moving the support. The damping valve group is connected to the upper and lower chambers of the damping jack respectively, and the resistance generated by the damping jack meets the requirements of the corresponding pushing force and frame moving force through the set pressure of the damping valve group; The tested hydraulic support is placed on the frame and its movement is restricted by the limiting structure arranged on the frame; The liquid supply pump station is respectively connected with the damping jack and the pushing mechanism of the tested hydraulic support through a hydraulic circuit, and is used to replenish liquid to the damping jack, and supply liquid to the pushing jack and the bottom lifting jack of the tested hydraulic support; The control system is connected with the signal of the pushing mechanism of the tested hydraulic support and is used for controlling the movement of the pushing jack and the bottom lifting jack of the tested hydraulic support.

2. The hydraulic support pushing mechanism life test device according to claim 1 is characterized in that: The damping valve group includes a lower chamber overflow valve, an upper chamber overflow valve and a hydraulic two-way lock; The lower chamber overflow valve is connected to the lower chamber of the damping jack. The lower chamber overflow valve is used to set the pressure that meets the push-slide force. When the pressure in the lower chamber of the damping jack reaches the set pressure of the lower chamber overflow valve, the liquid in the lower chamber of the damping jack is discharged through the lower chamber overflow valve. The upper chamber relief valve is connected to the upper chamber of the damping jack. When the pressure in the upper chamber of the damping jack reaches the set pressure of the upper chamber relief valve, the liquid in the upper chamber of the damping jack is discharged through the upper chamber relief valve. The hydraulic two-way lock is installed on the hydraulic circuit of the damping jack to prevent the liquid in the upper and lower chambers of the damping jack from being discharged through the hydraulic circuit of the damping jack.

3. The life test device for the hydraulic support pushing mechanism according to claim 2 is characterized in that: Pressure sensors are installed in the upper and lower chambers of the push jack and the damping jack respectively. The control system reads and records the pressure values ​​of the upper and lower chambers of the push jack and the damping jack respectively in real time during the test through the corresponding pressure sensors.

4. A test method for the hydraulic support pushing mechanism life test device as claimed in claim 3, characterized in that: The following steps are involved: First, the force exerted on the pushing mechanism during pushing and sliding and frame shifting is calculated. Then, the set pressure of the damping valve group is set to make the resistance generated by the damping jack meet the requirements of the pushing force and frame shifting force. Then, the control system controls the tested hydraulic support pushing mechanism to automatically cycle the actions of pushing the damping jack, lifting the bottom and pulling the damping jack, simulating the actions performed by the hydraulic support pushing mechanism during actual use underground, and then testing the life of the tested hydraulic support pushing mechanism. According to the test requirements, the life test is completed when the tested hydraulic support pushing mechanism automatically cycles the actions of pushing the damping jack, lifting the bottom and pulling the damping jack for the specified number of cycles. Finally, the control system extracts the upper and lower cavity pressure values ​​of the pushing jack and the damping jack collected by each pressure sensor during the test, so as to analyze the pressure value data later.

5. The test method of the hydraulic support pushing mechanism life test device according to claim 4 is characterized in that: The control system controls the tested hydraulic support pushing mechanism to automatically cycle through the actions of pushing the damping jack, lifting the bottom, and pulling the damping jack. The specific actions are: Step 1: Initially, the push jack is fully extended, the push rod is fully retracted, and the damping jack is in the extended state, simulating the state of being ready to push and slide; Step 2: The push jack is retracted, driving the push rod to extend, and the push rod pushes the damping jack to retract the damping jack, simulating the pushing and sliding action of the hydraulic support. During this process, the liquid in the lower chamber of the damping jack is compressed. When the liquid pressure in the lower chamber of the damping jack reaches the set pressure of the lower chamber relief valve, the liquid in the lower chamber of the damping jack is discharged through the lower chamber relief valve, and at the same time, the upper chamber of the damping jack is replenished with liquid through the hydraulic circuit; Step 3: Extend the bottom lifting jack to lift the front end of the base of the tested hydraulic support to realize the bottom lifting action of the hydraulic support and simulate the state of preparing to move the support; Step 4: The push jack is extended, driving the push rod to retract, and the push rod pulls the damping jack to extend the damping jack, simulating the hydraulic support moving action. During this process, the liquid in the upper chamber of the damping jack is compressed. When the liquid pressure in the upper chamber of the damping jack reaches the set pressure of the upper chamber relief valve, the liquid in the upper chamber of the damping jack is discharged through the upper chamber relief valve, and at the same time, the lower chamber of the damping jack is replenished with liquid through the hydraulic circuit; Step 5: Retract the bottom jack and return to the initial state of step 1 to prepare for the next cycle; Step 6: Repeat steps 2 to 5 to automatically complete the required number of cycles.

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