Hydraulic support rigidity testing device and method

Abstract

The invention provides a hydraulic support rigidity testing device and method.The device comprises a loading test bench, a distance measuring module, a force measuring module and a data processing module, and the loading test bench is used for placing a to-be-tested hydraulic support and pressurizing the to-be-tested hydraulic support; the distance measuring module is used for acquiring the displacement in the pressurizing process after the loading test bed pressurizes the hydraulic support to be tested to a preset state; the force measurement module is used for obtaining the pressure increment of the to-be-tested hydraulic support after the loading test bed pressurizes the to-be-tested hydraulic support to a preset state; and the data processing module determines the support rigidity of the to-be-tested hydraulic support based on the displacement amount and the pressure increment. By taking the whole to-be-measured hydraulic support as an object, the result of comprehensive influence of factors such as the type of the to-be-measured hydraulic support, the cylinder diameter of the stand column and the strength of the structural member is considered in the measurement of the rigidity value, the accurate measurement process of the support rigidity of the to-be-measured hydraulic support is realized, and the accuracy of the measurement of the support rigidity of the to-be-measured hydraulic support is improved.

Description

Technical Field

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

[0002] The interaction between hydraulic supports and surrounding rocks in coal mining sites is the core content of the research on mine pressure and rock formation control, and is also an important basis for guiding the selection of supports for coal mining working faces. Among them, the stiffness of hydraulic supports is the basic indicator for establishing the mechanical model of the "support-surrounding rock" system and analyzing the overall stability of the system.

[0003] The existing method is based on approximating the stiffness of the hydraulic support to the equivalent column stiffness, ignoring the influence of the support structure size, structural member strength, position, etc. on its overall stiffness, resulting in low accuracy of the determined hydraulic support stiffness. Summary of the invention

[0004] The invention provides a hydraulic support stiffness testing device and method, which are used to improve the hydraulic support stiffness measurement accuracy.

[0005] The present invention provides a hydraulic support stiffness testing device, comprising a loading test bench, a distance measuring module, a force measuring module and a data processing module; The loading test bench is used to place the hydraulic support to be tested and pressurize the load-bearing top beam of the hydraulic support to be tested; The distance measuring module is used to obtain the displacement of the hydraulic support to be tested during the pressurization process after the loading test bench pressurizes the hydraulic support to be tested to a preset state, wherein the pressurization to the preset state is to pressurize until the safety valve of the hydraulic support to be tested is opened, and then continue to pressurize until the hydraulic support to be tested is retracted by a preset distance; The force measuring module is used to obtain the pressure increment of the hydraulic support to be tested after the loading test bench pressurizes the hydraulic support to be tested to a preset state; The first end of the data processing module is connected to the distance measuring module, and the second end of the data processing module is connected to the force measuring module, and is used to obtain the displacement and the pressure increment, and based on the displacement and the pressure increment, determine the support stiffness of the hydraulic support to be tested, and the support stiffness is used to characterize the compressive strength of the hydraulic support to be tested.

[0006] According to a hydraulic support stiffness testing device provided by the present invention, the distance measuring module includes a first laser distance measuring device, a second laser distance measuring device and a first calculation submodule; The first laser rangefinder is set and the second laser rangefinder is set respectively on the left and right guard plates of the hydraulic support to be tested; The first laser rangefinder is connected to the first calculation submodule and is used to obtain a first displacement of the hydraulic support to be tested after being pressurized to a preset state; The second laser rangefinder is connected to the first calculation submodule and is used to obtain a second displacement of the hydraulic support to be tested after being pressurized to a preset state; The first calculation submodule is used to determine the displacement amount based on the first displacement and the second displacement.

[0007] According to a hydraulic support stiffness testing device provided by the present invention, the force measuring module includes a pressure sensor and a second calculation submodule; The pressure sensor is connected to the hydraulic oil circuit of the column of the hydraulic support to be tested, and is used to obtain the column pressure value of the column after the hydraulic support to be tested is pressurized to a preset state; The second calculation submodule is connected to the pressure sensor, and is used to obtain the column pressure value, and determine the pressure increment based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

[0008] According to a hydraulic support stiffness testing device provided by the present invention, the second calculation submodule is also used for: The pressure increment is determined as the difference between the column pressure value and the rated initial support force.

[0009] According to a hydraulic support stiffness testing device provided by the present invention, the data processing module is also used for: The support stiffness is determined as a ratio of the pressure increment to the displacement.

[0010] The present invention also provides a hydraulic support stiffness testing method based on the above hydraulic support stiffness testing device, comprising the following steps: After the hydraulic support to be tested placed in the loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained, wherein the pressurization to the preset state is to pressurize until the safety valve of the hydraulic support to be tested is opened, and then continue to pressurize until the hydraulic support to be tested is retracted by a preset distance; After the loading test bench pressurizes the hydraulic support to be tested to a preset state, obtaining a pressure increment received by the hydraulic support to be tested; Based on the displacement and the pressure increment, the support stiffness of the hydraulic support to be tested is determined, and the support stiffness is used to characterize the compressive strength of the hydraulic support to be tested.

[0011] According to a method for testing the stiffness of a hydraulic support provided by the present invention, after a hydraulic support to be tested placed in a loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained, including: Based on a first laser rangefinder arranged on the left guard plate of the hydraulic support to be tested, a first displacement of the hydraulic support to be tested after being pressurized to a preset state is obtained; Based on a second laser rangefinder arranged on the right guard plate of the hydraulic support to be tested, a second displacement of the hydraulic support to be tested after being pressurized to a preset state is obtained; The displacement amount is determined based on the first displacement and the second displacement.

[0012] According to a method for testing the stiffness of a hydraulic support provided by the present invention, after the loading test bench pressurizes the hydraulic support to be tested to a preset state, obtaining the pressure increment received by the hydraulic support to be tested comprises: After the hydraulic support to be tested is pressurized to a preset state, a column pressure value of the column is obtained based on a pressure sensor, and the pressure sensor is connected to a hydraulic oil circuit of the column of the hydraulic support to be tested; The pressure increment is determined based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

[0013] According to a hydraulic support stiffness testing method provided by the present invention, the pressure increment is the difference between the column pressure value and the rated initial support force.

[0014] According to a hydraulic support stiffness testing method provided by the present invention, the support stiffness is the ratio of the pressure increment to the displacement.

[0015] The hydraulic support stiffness testing device and method provided by the present invention obtains the displacement and pressure increment of the hydraulic support to be tested during the process of pressurizing and increasing resistance, inverts the displacement and pressure increment to obtain the support stiffness, and the measured stiffness is the overall stiffness of the support. Taking the entire hydraulic support to be tested as the object, the measured stiffness value takes into account the comprehensive influence of factors such as the frame type of the hydraulic support to be tested, the cylinder diameter of the column, and the strength of the structural parts, thereby realizing the accurate measurement process of the support stiffness of the hydraulic support to be tested, and improving the accuracy of the support stiffness measurement of the hydraulic support to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the hydraulic support stiffness testing device provided by the present invention.

[0018] Figure 2 It is a schematic diagram of the test setting structure provided by the present invention.

[0019] Figure 3 It is a structural schematic diagram of the loading process provided by the present invention.

[0020] Figure 4 It is a schematic diagram of the change curve of key data provided by the present invention.

[0021] Figure 5 It is a flow chart of a hydraulic support stiffness testing method implemented based on a hydraulic support stiffness testing device provided by the present invention.

[0022] Reference numerals: 110: Loading test bench; 120: Distance measurement module; 130: Force measurement module; 150: Support plate of the loading test bench. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0024] The interaction between hydraulic supports and surrounding rocks in coal mining sites is the core content of the research on mine pressure and rock formation control, and is also an important basis for guiding the selection of supports for coal mining working faces. Among them, the stiffness of hydraulic supports is the basic indicator for establishing the mechanical model of the "support-surrounding rock" system and analyzing the overall stability of the system.

[0025] There is a relative lack of numerical values ​​for hydraulic support stiffness, and there are two main methods for determining it: one is to approximate the support stiffness to the equivalent column stiffness, which ignores the influence of the support structure size, structural member strength, position, etc. on its overall stiffness; the other is to conduct a mechanical analysis of the support stress structure based on the support stress state, which is relatively complex and also ignores the influence of the machine-liquid coupling relationship, component gaps, steel type, etc. The difficulty in measuring support stiffness and the lack of stiffness data have seriously restricted the development of surrounding rock control technology in mining areas. In view of the defects in the related methods, the present invention provides a hydraulic support stiffness testing device. Figure 1 Schematic diagram of the structure of the hydraulic support stiffness testing device provided by the present invention. Figure 1 As shown, the device includes: a loading test bench 110 , a distance measurement module 120 , a force measurement module 130 and a data processing module 140 .

[0026] Determine the hydraulic support to be tested and its basic parameters, especially the initial support force of the support, the opening pressure of the safety valve, etc. The loading test bench 110 is used to place the hydraulic support to be tested, move the hydraulic support to be tested to the loading test bench 110 by a crane, operate the support pushing mechanism to move it to the test position in the loading test bench 110, and adjust the shape of the hydraulic support to be tested to ensure that the top beam of the hydraulic support to be tested is level.

[0027] The schematic diagram of the specific test setup can be as follows: Figure 2 As shown in the schematic diagram of the test setup structure provided by the present invention, the hydraulic support to be tested is placed on the supporting plate 150 of the loading test bench 110, and the loading test bench 110 is used to pressurize the load-bearing top beam of the hydraulic support to be tested, so as to realize the subsequent test process of the hydraulic support to be tested. After reaching the preset state, the distance measurement module 120 obtains the displacement of the hydraulic support to be tested during the pressurization process; the force measurement module 130 obtains the pressure increment of the hydraulic support to be tested during the pressurization process.

[0028] After the hydraulic support to be tested is placed in the loading test bench 110, a distance measurement module 120 and a force measurement module 130 are set to collect key data during the test of the hydraulic support to be tested. The schematic diagram of loading after the hydraulic support to be tested is placed in the loading test bench 110 can be as follows: Figure 3 The loading process structure provided by the present invention is shown in the schematic diagram.

[0029] After the distance measuring module 120 and the force measuring module 130 are set up, the distance measuring module 120 and the force measuring module 130 are connected to the power supply and the CAN to USB module respectively based on the communication cable (signal line) for power supply and data collection. The distance measuring module 120 and the force measuring module 130 are connected to the data processing module 140.

[0030] After all settings are completed, operate the test bench to supply fluid and pressurize it, and perform top beam balanced external loading on the hydraulic support to be tested. When the column pressure of the hydraulic support to be tested reaches the rated initial support force of the support, it will pause. This is the initial state of the hydraulic support to be tested.

[0031] Continue to pressurize the hydraulic support to be tested. When the safety valve of the hydraulic support to be tested is opened, the emulsion of the column can be observed to flow out, and the pressure value fluctuates up and down. Continue to pressurize the hydraulic support to be tested until the column retracts a preset distance (which can be 0.3~0.5m), then stop loading, and at the same time, obtain the displacement of the hydraulic support to be tested during the pressurization process based on the distance measurement module 120, and obtain the pressure increment of the hydraulic support to be tested based on the force measurement module 130.

[0032] After the distance measuring module 120 obtains the displacement of the hydraulic support to be measured during the pressurization process, the distance measuring module 120 sends the obtained displacement to the data processing module 140 .

[0033] After the force measuring module 130 obtains the pressure increment received by the hydraulic support to be tested, the force measuring module 130 sends the obtained pressure increment to the data processing module 140 .

[0034] After receiving the displacement and the pressure increment, the data processing module 140 determines the support stiffness of the hydraulic support to be tested.

[0035] Optionally, based on Hooke's law, the ratio of the pressure increment to the displacement can be used as the support stiffness of the hydraulic support to be tested. The support stiffness of the hydraulic support to be tested represents the compression resistance of the hydraulic support to be tested.

[0036] The hydraulic support stiffness test device provided by the present invention obtains the displacement and pressure increment of the hydraulic support to be tested during the process of pressurizing and increasing resistance, inverts the displacement and pressure increment to obtain the support stiffness, and the measured stiffness is the overall stiffness of the support. Taking the entire hydraulic support to be tested as the object, the measured stiffness value takes into account the comprehensive influence of factors such as the frame type of the hydraulic support to be tested, the cylinder diameter of the column, and the strength of the structural parts, thereby realizing the accurate measurement process of the support stiffness of the hydraulic support to be tested, and improving the accuracy of the support stiffness measurement of the hydraulic support to be tested.

[0037] In one embodiment, the ranging module includes a first laser rangefinder, a second laser rangefinder and a first calculation submodule; the first laser rangefinder and the second laser rangefinder are respectively arranged on the left and right guard plates of the hydraulic support to be tested; the first laser rangefinder is connected to the first calculation submodule, and is used to obtain the first displacement of the hydraulic support to be tested when it is pressurized to the hydraulic support; the second laser rangefinder is connected to the first calculation submodule, and is used to obtain the second displacement of the hydraulic support to be tested after it is pressurized to a preset state; the first calculation submodule is used to determine the displacement based on the first displacement and the second displacement.

[0038] The distance measurement module includes a first laser distance meter, a second laser distance meter and a first calculation submodule.

[0039] The first laser rangefinder and the second laser rangefinder are respectively arranged on the left and right guard plates of the hydraulic support to be tested, and the specific positions can be located at the horizontal projections of the left and right columns. The laser rangefinder can be stably and easily disassembled by adsorption with a strong magnet.

[0040] After the hydraulic support to be tested is pressurized to a preset state based on the loading test bench, a first displacement is obtained based on the first laser rangefinder, and a second displacement is obtained based on the first laser rangefinder.

[0041] The first laser rangefinder obtains the first displacement and sends it to the first calculation submodule. The second laser rangefinder obtains the second displacement and sends it to the first calculation submodule.

[0042] After receiving the first displacement and the second displacement, the first calculation submodule may calculate an average value of the first displacement and the second displacement, and use the calculated average value as the displacement amount.

[0043] In one embodiment, the force measuring module includes a pressure sensor and a second calculation submodule; the pressure sensor is connected to the hydraulic oil circuit of the column of the hydraulic support to be tested, and is used to obtain the column pressure value of the column after the hydraulic support to be tested is pressurized to a preset state; the second calculation submodule is connected to the pressure sensor, and is used to obtain the column pressure value, and determine the pressure increment based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

[0044] Connect the pressure sensor to the hydraulic oil circuit of the support column. If the test support is a two-column type, the sensor is connected to the left and right column hydraulic pipelines respectively; if the test support is a four-column type, the sensor is connected to the front and rear column hydraulic pipelines respectively.

[0045] After the hydraulic support to be tested is pressurized to a preset state, the column pressure value of the column is obtained and sent to the second calculation submodule. After receiving the column pressure value, the second calculation submodule determines the pressure increment based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

[0046] The specific key data obtained, column pressure and displacement change curves, can be shown as follows: Figure 4 The change curve diagram of the key data provided by the present invention is shown in FIG.

[0047] It should be noted that the rated initial support force of the hydraulic support to be tested refers to the support force applied to the top plate when the support is installed, which is an important indicator of the performance of the hydraulic support to be tested. When the pressure in the piston chambers of all the pillars of the hydraulic support to be tested reaches the rated working pressure of the pump station, the support force of the hydraulic support to be tested on the top plate is the initial support force of the hydraulic support to be tested. The rated initial support force ensures that the hydraulic support to be tested can effectively support the top plate in the initial stage, prevent the top plate from sinking or collapsing, and thus maintain the safety of the working surface.

[0048] In one embodiment, the second calculation submodule is further used to: determine the pressure increment as the difference between the column pressure value and the rated initial support force.

[0049] It can be understood that by subtracting the rated initial support force from the column pressure value and the rated initial support force at the initial moment of the support resistance increase, the increase in the support pressure during the pressurization and resistance increase stage of the loading test bench can be obtained.

[0050] In one embodiment, the data processing module is further used to: determine the support stiffness as the ratio of the pressure increment to the displacement.

[0051] The bracket stiffness calculation formula can be as follows: ; Where: is the pressure increment, is the displacement, K is the support stiffness of the hydraulic support to be tested, in MPa / m; P k is the column pressure value measured at the end of pressurization, MPa; P 0 is the rated initial support force, MPa; s 0 , s k They are the distances between the top beam and the base during initial loading and before the safety valve is opened, respectively.

[0052] Optionally, the test can be performed multiple times to N The group support stiffness data is averaged, and the average value obtained is the final overall stiffness of the hydraulic support to be tested. After a test is completed, it is necessary to wait for the test bench to slowly rise to the set height, readjust the support shape, and make the top beam contact horizontally with the test bench to prepare for the next support stiffness test.

[0053] Optionally, the bracket stiffness calculation formula can be calculated based on the column pressure, and the obtained stiffness unit is MPa / m, which is the change in bracket support strength when the bracket is compressed by 1m, which is similar to the elastic foundation coefficient of the elastic foundation. The dimension can also be transformed by multiplying the obtained stiffness by the bracket top control area to obtain the traditional bracket line stiffness in units of kN / m.

[0054] The present invention also provides a hydraulic support stiffness testing method based on the hydraulic support stiffness testing device, such as Figure 5 As shown, the specific steps include: Step 510, after the hydraulic support to be tested placed in the loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained, wherein the pressurization to the preset state is to pressurize until the safety valve of the hydraulic support to be tested is opened, and then continue to pressurize until the hydraulic support to be tested is retracted by a preset distance; Step 520, after the loading test bench pressurizes the hydraulic support to be tested to a preset state, obtaining the pressure increment received by the hydraulic support to be tested; Step 530: Determine the support stiffness of the hydraulic support to be tested based on the displacement and the pressure increment, wherein the support stiffness is used to characterize the compressive strength of the hydraulic support to be tested.

[0055] The execution subject of the hydraulic support stiffness test method provided by the present invention can be an electronic device, a component in an electronic device, an integrated circuit, or a chip. The electronic device can be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and the non-mobile electronic device can be a server, a network attached storage (NAS), or a personal computer (PC), etc., which is not specifically limited by the present invention.

[0056] The following takes the hydraulic support stiffness testing method provided by the present invention executed by a computer as an example to describe the technical solution of the present invention in detail.

[0057] In step 510, after the hydraulic support to be tested placed in the loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained. The pressurization to the preset state is to pressurize the hydraulic support to be tested until the safety valve of the hydraulic support to be tested is opened, and then continue to pressurize the hydraulic support to be tested until it retracts a preset distance.

[0058] Determine the hydraulic support to be tested and its basic parameters, especially the initial support force of the support, the opening pressure of the safety valve, etc. The loading test bench is used to place the hydraulic support to be tested, move the hydraulic support to be tested to the loading test bench by a crane, operate the support pushing mechanism to move it to the test position in the loading test bench, and adjust the shape of the hydraulic support to be tested to ensure that the top beam of the hydraulic support to be tested is level.

[0059] Among them, the loading test bench is used to pressurize the load-bearing top beam of the hydraulic support to be tested, so as to realize the subsequent testing process of the hydraulic support to be tested.

[0060] In step 520, after the loading test bench pressurizes the hydraulic support to be tested to a preset state, the pressure increment received by the hydraulic support to be tested is obtained; After all settings are completed, operate the test bench to supply fluid and pressurize it, and perform top beam balanced external loading on the hydraulic support to be tested. When the column pressure of the hydraulic support to be tested reaches the rated initial support force of the support, it will pause. This is the initial state of the hydraulic support to be tested.

[0061] Continue to pressurize the hydraulic support to be tested. When the safety valve of the hydraulic support to be tested is opened, the emulsion of the column can be observed to flow out, and the pressure value fluctuates up and down. Continue to pressurize the hydraulic support to be tested until the column retracts a preset distance (which can be 0.3~0.5m), then stop loading, and at the same time obtain the displacement of the hydraulic support to be tested during the pressurization process, and obtain the pressure increment of the hydraulic support to be tested.

[0062] Optionally, the displacement and pressure can be collected synchronously at the millisecond level. Other precision displacement and pressure monitoring and collection systems can also be used for monitoring and collection. However, since the loading bracket time is short, usually 3 to 8 minutes, the data collection time interval should not be too long.

[0063] In step 530, the support stiffness of the hydraulic support to be tested is determined based on the displacement and the pressure increment, and the support stiffness is used to characterize the compressive strength of the hydraulic support to be tested.

[0064] Based on the displacement and pressure increment, the support stiffness of the hydraulic support to be tested is determined.

[0065] Optionally, based on Hooke's law, the ratio of the pressure increment to the displacement can be used as the support stiffness of the hydraulic support to be tested. The support stiffness of the hydraulic support to be tested represents the compression resistance of the hydraulic support to be tested.

[0066] The hydraulic support stiffness test method provided by the present invention obtains the displacement and pressure increment of the hydraulic support to be tested during the process of pressurizing and increasing resistance, inverts the displacement and pressure increment to obtain the support stiffness, and the measured stiffness is the overall stiffness of the support. Taking the entire hydraulic support to be tested as the object, the measured stiffness value takes into account the comprehensive influence of factors such as the frame type, column cylinder diameter, and structural member strength of the hydraulic support to be tested, thereby realizing the accurate measurement process of the support stiffness of the hydraulic support to be tested and improving the accuracy of the support stiffness measurement of the hydraulic support to be tested.

[0067] In one embodiment, after the hydraulic support to be tested placed in the loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained, including: based on a first laser rangefinder set on the left guard plate of the hydraulic support to be tested, the first displacement of the hydraulic support to be tested after being pressurized to the preset state is obtained; based on a second laser rangefinder set on the right guard plate of the hydraulic support to be tested, the second displacement of the hydraulic support to be tested after being pressurized to the preset state is obtained; based on the first displacement and the second displacement, the displacement is determined.

[0068] The first laser rangefinder and the second laser rangefinder are respectively arranged on the left and right guard plates of the hydraulic support to be tested, and the specific positions can be located at the horizontal projections of the left and right columns. The laser rangefinder can be stably and easily disassembled by adsorption with a strong magnet.

[0069] After the hydraulic support to be tested is pressurized to a preset state based on the loading test bench, a first displacement is obtained based on the first laser rangefinder, and a second displacement is obtained based on the first laser rangefinder.

[0070] An average value of the first displacement and the second displacement may be calculated, and the calculated average value is used as the displacement amount.

[0071] In one embodiment, after the loading test bench pressurizes the hydraulic support to be tested to a preset state, the pressure increment received by the hydraulic support to be tested is obtained, including: after the hydraulic support to be tested is pressurized to a preset state, obtaining a column pressure value of a column based on a pressure sensor, the pressure sensor being connected to a hydraulic oil circuit of the column of the hydraulic support to be tested; determining the pressure increment based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

[0072] Connect the pressure sensor to the hydraulic oil circuit of the support column. If the test support is a two-column type, the sensor is connected to the left and right column hydraulic pipelines respectively; if the test support is a four-column type, the sensor is connected to the front and rear column hydraulic pipelines respectively.

[0073] After the hydraulic support to be tested is pressurized to a preset state, a column pressure value of the column is obtained. Based on the column pressure value and the rated initial support force of the hydraulic support to be tested, a pressure increment is determined.

[0074] It should be noted that the rated initial support force of the hydraulic support to be tested refers to the support force applied to the top plate when the support is installed, which is an important indicator of the performance of the hydraulic support to be tested. When the pressure in the piston chambers of all the pillars of the hydraulic support to be tested reaches the rated working pressure of the pump station, the support force of the hydraulic support to be tested on the top plate is the initial support force of the hydraulic support to be tested. The rated initial support force ensures that the hydraulic support to be tested can effectively support the top plate in the initial stage, prevent the top plate from sinking or collapsing, and thus maintain the safety of the working surface.

[0075] In one embodiment, the pressure increment is the difference between the column pressure value and the rated initial support force.

[0076] It can be understood that by subtracting the rated initial support force from the column pressure value and the rated initial support force at the initial moment of the support resistance increase, the increase in the support pressure during the pressurization and resistance increase stage of the loading test bench can be obtained.

[0077] In one embodiment, the support stiffness is a ratio of the pressure increment to the displacement.

[0078] The bracket stiffness calculation formula can be as follows: ; Where: is the pressure increment, is the displacement, K is the support stiffness of the hydraulic support to be tested, in MPa / m; P k is the column pressure value measured at the end of pressurization, MPa; P 0 is the rated initial support force, MPa; s 0 , s k They are the distances between the top beam and the base during initial loading and before the safety valve is opened, respectively.

[0079] Optionally, the test can be performed multiple times to N The group support stiffness data is averaged, and the average value obtained is the final overall stiffness of the hydraulic support to be tested.

[0080] Optionally, the bracket stiffness calculation formula can be calculated based on the column pressure, and the obtained stiffness unit is MPa / m, which is the change in bracket support strength when the bracket is compressed by 1m, which is similar to the elastic foundation coefficient of the elastic foundation. The dimension can also be transformed by multiplying the obtained stiffness by the bracket top control area to obtain the traditional bracket line stiffness in units of kN / m.

[0081] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0082] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic support stiffness testing device, characterized in that: include: Loading test bench, distance measurement module, force measurement module and data processing module; The loading test bench is used to place the hydraulic support to be tested and pressurize the load-bearing top beam of the hydraulic support to be tested; The distance measuring module is used to obtain the displacement of the hydraulic support to be tested during the pressurization process after the loading test bench pressurizes the hydraulic support to be tested to a preset state, wherein the pressurization to the preset state is to pressurize until the safety valve of the hydraulic support to be tested is opened, and then continue to pressurize until the hydraulic support to be tested is retracted by a preset distance; The force measuring module is used to obtain the pressure increment of the hydraulic support to be tested after the loading test bench pressurizes the hydraulic support to be tested to a preset state; The first end of the data processing module is connected to the distance measuring module, and the second end of the data processing module is connected to the force measuring module, and is used to obtain the displacement and the pressure increment, and based on the displacement and the pressure increment, determine the support stiffness of the hydraulic support to be tested, and the support stiffness is used to characterize the compressive strength of the hydraulic support to be tested.

2. The hydraulic support stiffness testing device according to claim 1, characterized in that: The distance measurement module includes a first laser distance meter, a second laser distance meter and a first calculation submodule; The first laser rangefinder is set and the second laser rangefinder is set respectively on the left and right guard plates of the hydraulic support to be tested; The first laser rangefinder is connected to the first calculation submodule and is used to obtain a first displacement of the hydraulic support to be tested after being pressurized to a preset state; The second laser rangefinder is connected to the first calculation submodule and is used to obtain a second displacement of the hydraulic support to be tested after being pressurized to a preset state; The first calculation submodule is used to determine the displacement amount based on the first displacement and the second displacement.

3. The hydraulic support stiffness testing device according to claim 1, characterized in that: The force measurement module includes a pressure sensor and a second calculation submodule; The pressure sensor is connected to the hydraulic oil circuit of the column of the hydraulic support to be tested, and is used to obtain the column pressure value of the column after the hydraulic support to be tested is pressurized to a preset state; The second calculation submodule is connected to the pressure sensor, and is used to obtain the column pressure value, and determine the pressure increment based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

4. The hydraulic support stiffness testing device according to claim 3, characterized in that: The second calculation submodule is further used for: The pressure increment is determined as the difference between the column pressure value and the rated initial support force.

5. The hydraulic support stiffness testing device according to claim 1, characterized in that: The data processing module is also used for: The support stiffness is determined as a ratio of the pressure increment to the displacement.

6. A method for testing the stiffness of a hydraulic support implemented based on the hydraulic support stiffness testing device according to any one of claims 1 to 5, characterized in that: include: After the hydraulic support to be tested placed in the loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained, wherein the pressurization to the preset state is to pressurize until the safety valve of the hydraulic support to be tested is opened, and then continue to pressurize until the hydraulic support to be tested is retracted by a preset distance; After the loading test bench pressurizes the hydraulic support to be tested to a preset state, obtaining a pressure increment received by the hydraulic support to be tested; Based on the displacement and the pressure increment, the support stiffness of the hydraulic support to be tested is determined, and the support stiffness is used to characterize the compressive strength of the hydraulic support to be tested.

7. The method for testing the rigidity of a hydraulic support according to claim 6, characterized in that: After the hydraulic support to be tested placed in the loading test bench is pressurized to a preset state, the displacement of the hydraulic support to be tested during the pressurization process is obtained, including: Based on a first laser rangefinder arranged on the left guard plate of the hydraulic support to be tested, a first displacement of the hydraulic support to be tested after being pressurized to a preset state is obtained; Based on a second laser rangefinder arranged on the right guard plate of the hydraulic support to be tested, a second displacement of the hydraulic support to be tested after being pressurized to a preset state is obtained; The displacement amount is determined based on the first displacement and the second displacement.

8. The method for testing the rigidity of a hydraulic support according to claim 6, characterized in that: After the loading test bench pressurizes the hydraulic support to be tested to a preset state, obtaining the pressure increment received by the hydraulic support to be tested includes: After the hydraulic support to be tested is pressurized to a preset state, a column pressure value of the column is obtained based on a pressure sensor, and the pressure sensor is connected to a hydraulic oil circuit of the column of the hydraulic support to be tested; The pressure increment is determined based on the column pressure value and the rated initial support force of the hydraulic support to be tested.

9. The method for testing the rigidity of a hydraulic support according to claim 8, characterized in that: The pressure increment is the difference between the column pressure value and the rated initial support force.

10. The method for testing the rigidity of a hydraulic support according to claim 6, characterized in that: The support stiffness is the ratio of the pressure increment to the displacement.

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