A hydraulic rock drill rotation torque test device

Abstract

The present invention discloses a rotary torque test device and method for a hydraulic rock drill, including a rock drill hydraulic control system and a rotary torque test system, wherein the rock drill hydraulic control system is composed of a motor, a hydraulic pump, a multi-way valve group, a speed regulating valve, a pressure gauge, a flow meter, a hydraulic cylinder, a rock drill and a drill rod; the rotary torque test system is mainly composed of a reflective label, a hysteresis brake, a stress signal acquisition card, a strain gauge, a router, a speed data acquisition card, a speed sensor, and a test computer. The present invention measures the maximum value of the shear strain of the rock drill under the rated working pressure and flow, and can calculate the rotary torque of the rock drill through relevant data processing. The equipment used in the rotary torque test system is simple to operate, and data acquisition is reliable. The value of the shear strain can be directly calculated through signal processing, which reduces the human error of data processing and makes the data more reliable.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical performance testing of rock drills, in particular to a rotary torque testing device for hydraulic rock drills. Background Art

[0002] The hydraulic control system of the rock drill mainly controls the hydraulic system through a multi-way valve group. The motor drives the hydraulic pump to provide power for the rotary motor cylinder of the rock drill. The hysteresis brake is used to add torque to the drill rod. This causes the drill rod to rotate to a certain extent and generate a shear strain. The rotary torque test system is composed of reflective labels, hysteresis brakes, stress signal acquisition cards, strain gauges, routers, speed data acquisition cards, speed sensors, and test computers.

[0003] A hydraulic rock drill rotary torque testing device and method in the prior art have the following disadvantages:

[0004] 1. Patent document CN106124099A discloses a rotary torque test device and method for a hydraulic rock drill, comprising "an assembly platform and a power source, a transmission device, a torque sensor and a driving structure connected in sequence; the driving structure is used to drive one of the inner ring and the outer ring of the slewing bearing to be tested to rotate relative to the other, and a plurality of fixed structures are arranged on the assembly platform at intervals in the horizontal direction, and the distances between the plurality of fixed structures and the center of the slewing bearing to be tested are different. The plurality of fixed structures can realize the fixing of slewing bearings of different specifications on the same assembly platform, thereby realizing the torque testing of slewing bearings of different specifications on the same assembly platform. The slewing bearing torque test device provided by the present invention has strong versatility, flexibility and practicality, greatly improves the torque test efficiency, greatly improves the test accuracy, and avoids accidents caused by unqualified products entering the market." When the above device is used, the rotary torque value of the rock drill can be calculated through data processing, and the speed electrical signal is measured by the speed sensor. The speed of the drill rod in the working environment can be directly obtained through data processing, but most devices are complicated to operate, resulting in inconvenience in use.

[0005] 2. A hydraulic rock drill rotary torque testing device and method in the prior art requires staff to quickly adjust the inside of the device when in use, but most devices are difficult to adjust, resulting in poor reliability.

[0006] 3. In the prior art, there is a hydraulic rock drill rotary torque testing device and method. When using the device, the staff needs to collect data and then perform numerical processing on the data signal separately. However, most devices have poor performance and are inconvenient to use. Summary of the invention

[0007] The object of the present invention is to provide a hydraulic rock drill rotary torque testing device to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic rock drill rotary torque testing device and method, including a rock drill hydraulic control system and a rotary torque testing system, wherein the rock drill hydraulic control system is composed of a motor, a hydraulic pump, a multi-way valve group, a speed regulating valve, a pressure gauge, a flow meter, a hydraulic cylinder, a rock drill and a drill rod; the rotary torque testing system is mainly composed of a reflective label, a hysteresis brake, a stress signal acquisition card, a strain gauge, a router, a speed data acquisition card, a speed sensor, and a test computer.

[0009] Preferably, the rock drill hydraulic control system mainly controls the operation of the hydraulic cylinder and the rock drill through a multi-way valve group. The hydraulic cylinder moves the rock drill to the working position. After the rock drill obtains hydraulic power, the hydraulic motor inside the rock drill drives the drill rod to rotate, transmitting a large torque to the drill rod.

[0010] Preferably, the rock drill is welded above the fixed plate, and two cylinders with inner and outer through holes are welded below the fixed plate to cooperate with the cylindrical slide rail on the fixed bracket to facilitate the axial movement of the position of the rock drill.

[0011] Preferably, the tail end of the hydraulic cylinder is welded in a bracket, and the end of the hydraulic cylinder with a rod end is welded to a fixed position of the rock drill; the function of the hydraulic cylinder is to control the rock drill to move to a working position.

[0012] Preferably, the hydraulic cylinder tail end is welded in a bracket, and the end of the hydraulic cylinder with a rod end is welded to the fixed position of the rock drill; the role of the hydraulic cylinder is to control the rock drill to move to the working position. The principle of the rotary torque test system: reflective labels, hysteresis brakes, speed sensors, speed data acquisition cards, strain gauges, strain signal acquisition cards and routers are pasted on the drill rod, and the speed sensor and strain gauge are respectively connected to the corresponding acquisition cards, and the wireless network is used to debug the test computer system and the acquisition card to establish a communication signal. Drive the hydraulic system of the rock drill, control the rotation speed of the drill rod through the multi-way valve group, and use the hysteresis brake to apply a load torque to the drill rod to cause a torsion on the drill rod. At this time, the strain gauge can measure the electrical signal test data of the shear strain, and the test data will be transmitted to the test computer in the form of photoelectric signals after being processed by the acquisition card. The test computer processes the processed photoelectric signals again, and finally displays and records the relevant data, starts the test bench, sets the rock drill under the rated working pressure and flow, gradually increases the load until the drill rod stops rotating, and collects and records the shear strain data through the computer. Repeat the test 5 times and take the arithmetic mean of the maximum shear strain values.

[0013] Preferably, the maximum load of the test should be no less than 80% of the maximum working load of the equipment;

[0014] Strain data acquisition system requirements: range not less than ±5000με; indication error not greater than 1% or ±5με; sampling frequency not less than 1kHz; maximum size of acquisition equipment not greater than 100mm; total weight of acquisition equipment not greater than 500g;

[0015] The drill rod material is generally 30CrMoNiV, and its mass length is equivalent to the length of the hydraulic rock drill piston;

[0016] The strain gauge operates in an ambient temperature of 10°C to 35°C, a compressed air temperature of 10°C to 35°C, and an atmospheric pressure of 96±10kPa; the sensitive grid length is not greater than 1mm; the resistance is not less than 120Ω; and the indication error is not greater than 1% or ±5με.

[0017] Preferably, the rock drill hydraulic cylinder and the multi-way valve group are connected by 6 sections of hose with a diameter of 30 mm and a length of 3 m.

[0018] Preferably, the hydraulic oil model meets the requirements of GB / T11118.1-2011.

[0019] Preferably, the data processing is finally performed, and the maximum shear strain of the rock drill rotary torque is calculated according to formula (1):

[0020] …… ...

[0021] Where:

[0022] ——maximum shear stress, in megapascals (MPa);

[0023] ——the shear modulus of elasticity of the elastic shaft, dimensionless;

[0024] ——maximum shear strain, dimensionless;

[0025] The torsional section coefficient is calculated according to formula (2):

[0026] …… ...

[0027] …… ...

[0028] Where:

[0029] ——Torsional section coefficient, in cubic millimeters (mm3 );

[0030] D ——Outer diameter of the drill rod, in millimeters (mm);

[0031] d ——Inner diameter of the drill rod, in millimeters (mm);

[0032] According to the relationship between torque and shear strain, the torque is calculated according to formula (3):

[0033] …… ...

[0034] Where:

[0035] T ——Slewing torque of the slewing mechanism, in Newton meters (N·m);

[0036] After data processing, the important parameters of the hydraulic rock drill's rotary torque can be calculated.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention measures the maximum value of the shear strain of the rock drill under the rated working pressure and flow rate, and can calculate the rotary torque of the rock drill through relevant data processing.

[0039] 2. The hydraulic control system of the present invention has a simple and reliable principle, strong operability, simple pressure and flow regulation, and pressure and flow regulation through an overflow valve and a speed regulating valve, and the device has high reliability.

[0040] 3. The equipment used in the rotary torque test system of the present invention is simple to operate and has reliable data acquisition. The value of shear strain can be directly calculated through signal processing, which reduces human errors in data processing and improves data reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a rotary torque test system of a hydraulic rock drill rotary torque test device provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of a rotary performance test system of a rotary torque test device for a hydraulic rock drill provided by an embodiment of the present invention;

[0043] Figure 3 A structural principle diagram of a hydraulic rock drill rotation torque testing device provided in an embodiment of the present invention.

[0044] In the figure: 1. drill rod; 2. reflective label; 3. hysteresis brake; 4. stress signal acquisition card; 5. strain gauge; 6. rock drill; 7. pressure gauge; 8. flow meter; 9. oil inlet circuit direction; 10. hydraulic cylinder; 11. multi-way valve group; 12. router; 13. test computer; 14. speed data acquisition card; 15. speed sensor; 16. motor; 17. hydraulic pump; 18. oil tank; 19. support moving guide rail, 20. support frame; 21. fixed bracket; 22. steel plate; 23. rock drill fixed plate; 24. hydraulic cylinder has rod end; 25. rock drill fixedly supports two cylindrical steel cylinders; 20-1. support frame; 19-1. support moving part; 21-1. fixed bracket; 22-1. steel plate 1; 23-1. rock drill fixed plate. DETAILED DESCRIPTION

[0045] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Embodiment 1:

[0049] See also Figure 1 , Figure 2 and Figure 3The present invention provides an embodiment of a hydraulic rock drill rotary torque test device, including a rock drill hydraulic control system and a rotary torque test system. The rock drill hydraulic control system is composed of a rock drill, a fixed movable bracket, a hydraulic cylinder, a multi-way valve group, a motor, and a hydraulic pump. The rock drill hydraulic system uses a motor to drive a hydraulic pump to provide hydraulic power, and controls the operation of the hydraulic cylinder and the rock drill through the multi-way valve group. The hydraulic cylinder moves the rock drill to a working position. After the rock drill obtains hydraulic power, the hydraulic motor inside the rock drill drives the drill rod to rotate, and transmits a large torque to the drill rod.

[0050] The rock drill 6 is connected to the top of the rock drill fixing plate 23 by threading, and a steel plate 22 is welded below the rock drill fixing plate 23. The steel plate 22 is fixed on the fixing bracket 21. The fixing bracket 21 has two rock drill fixing supports and two cylindrical steel cylinders 25, which are used to cooperate with the supporting movable guide rails 19 on the supporting frame 20 to facilitate the position movement of the rock drill 6. The connection of the hydraulic control system of the rock drill 6: the motor 16 is connected to the hydraulic pump 17, and the hydraulic pump 17 is connected to the multi-way valve group 11 through a hydraulic oil pipe, wherein the multi-way valve group 11 is an integrated multi-hydraulic valve and overflow valve, and is connected to the hydraulic cylinder 10 and the rock drill 6 through the control output end of the multi-way valve group. The oil inlet circuit and the oil return circuit of the rotating motor and the piston chamber of the rock drill 6 are respectively connected in series with a hydraulic pressure gauge 7, and the oil inlet circuit and the oil return circuit of the rotating motor and the piston chamber of the rock drill are also connected in series with a flow meter 8 for measuring the pressure and flow values ​​in the circuit.

[0051] Embodiment 2:

[0052] See also Figure 1 , Figure 2 and Figure 3 ,An embodiment of the present invention provides a hydraulic rock drill rotary torque test device, the rotary torque test system is mainly composed of a reflective label, a hysteresis brake, a stress signal acquisition card, a strain gauge, a router, a speed data acquisition card, a speed sensor, and a test computer. Before the experiment, the inner diameter and the outer diameter of the drill rod are measured and recorded;

[0053] The reflective label 2, hysteresis brake 3, speed sensor 15, speed data acquisition card 14, strain gauge 5, strain signal acquisition card 4 and router 12 are attached to the drill rod 1. Two strain gauges 5 are fixed at a position 100mm to 300mm away from the end of the drill tail, and are respectively at an angle of 45° and negative 45° with the axis direction of the drill rod 1; the speed sensor 15 and the strain gauge 5 are respectively connected with the corresponding acquisition card 4, and the wireless network is used to debug the test computer 13 system and the acquisition card 4 to establish a communication signal. The hydraulic system of the rock drill 6 is driven to control the rotation speed of the drill rod 4 through the multi-way valve group 11, and at the same time, a load torque is applied to the drill rod by the hysteresis brake 3 to generate a torsion on the drill rod 1. At this time, the strain gauge 5 can measure the electrical signal test data of the strain gauge, and the test data is finally transmitted to the test computer 13 after being processed by the acquisition card 4 in the form of photoelectric signals. The test computer 13 processes the processed photoelectric signals again and finally displays and records the relevant data.

[0054] Embodiment three:

[0055] See also Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention provides a hydraulic rock drill rotary torque test device, wherein two strain gauges are fixed at a position 100mm~300mm away from the end of the drill tail, and form an angle of 45° and negative 45° with the axis direction of the drill rod respectively; an acquisition card is fixed on the drill rod to achieve signal connection with the strain gauge, and a wireless network is used to debug a computer system and the acquisition card to establish a communication signal; the drill rod head is fixed on a torque load, and a speed sensor and a strain gauge are respectively connected to their corresponding acquisition cards to achieve signal connection, and a wireless network is used to debug a test computer system and the acquisition card to establish a communication signal. Drive the hydraulic system of the rock drill, control the rotation speed of the drill rod through the multi-way valve group, and use the hysteresis brake to apply a load torque to the drill rod to cause torsion on the drill rod. At this time, the strain gauge can measure the electrical signal test data of the shear strain. The test data is processed by the acquisition card in the form of photoelectric signals and finally transmitted to the test computer. The test computer processes the processed photoelectric signals again and finally displays and records the relevant data. Start the test bench, set the rock drill to the rated working pressure and flow, gradually increase the load until the drill rod stops rotating, and collect and record the shear strain data through the computer. Repeat the test 5 times, take the arithmetic mean of the maximum shear strain, and finally process the data. The maximum shear strain of the rock drill rotation torque is calculated according to formula (1):

[0056] …… ...

[0057] Where:

[0058] ——maximum shear stress, in megapascals (MPa);

[0059] ——the shear modulus of elasticity of the elastic shaft, dimensionless;

[0060] ——maximum shear strain, dimensionless.

[0061] The torsional section coefficient is calculated according to formula (2):

[0062] …… ...

[0063] …… ...

[0064] Where:

[0065] ——torsional section coefficient, in cubic millimeters (mm3);

[0066] D——Outer diameter of the drill rod, in millimeters (mm);

[0067] d – the inner diameter of the drill rod, in millimeters (mm).

[0068] According to the relationship between torque and shear strain, the torque is calculated according to formula (3):

[0069] …… ...

[0070] Where:

[0071] T——slewing torque of the slewing mechanism, in Newton meters (N·m);

[0072] After data processing, the important parameters of the rotary torque of the hydraulic rock drill can be calculated;

[0073] When the hysteresis brake 3 on the rock drill rod 1 applies torque, the rotary torque test system works synchronously at this time, and the test computer outputs data to obtain the corresponding shear strain value, and the rock drill 6 is measured to gradually increase the load under the rated working pressure and flow until the drill rod 1 stops rotating, and the shear strain data is collected and recorded by the test computer 13. Repeat the test 5 times and take the arithmetic mean of the maximum shear strain value.

[0074] In the present invention, the working steps of the device are as follows:

[0075] 1. The rock drill 6 is connected to the top of the rock drill fixing plate 23 by threads, and a steel plate 22 is welded below the rock drill fixing plate 23. The steel plate 22 is fixed on the fixing bracket 21. The fixing bracket 21 has two rock drill fixing supports and two cylindrical steel cylinders 25, which are used to cooperate with the supporting movable guide rails 19 on the supporting frame 20 to facilitate the position movement of the rock drill 6. Connection of the hydraulic control system of the rock drill 6: connect the motor 16 and the hydraulic pump 17, and the hydraulic pump 17 is connected to the multi-way valve group 11 through a hydraulic oil pipe, wherein the multi-way valve group 11 is an integrated plurality of hydraulic valves and overflow valves, and is connected to the hydraulic cylinder 10 and the rock drill 6 through the control output end of the multi-way valve group. The oil inlet circuit and the oil return circuit of the rotating motor and the piston chamber of the rock drill 6 are respectively connected in series with a hydraulic pressure gauge 7, and the oil inlet circuit and the oil return circuit of the rotating motor and the piston chamber of the rock drill are also connected in series with a flow meter 8 for measuring the pressure and flow values ​​in the circuit;

[0076] 2. The reflective label 2, hysteresis brake 3, speed sensor 15, speed data acquisition card 14, strain gauge 5, strain signal acquisition card 4 and router 12 are pasted on the drill rod 1. The two strain gauges 5 are fixed at a position 100mm to 300mm away from the end of the drill tail, and form an angle of 45° and negative 45° with the axis direction of the drill rod 1 respectively; the speed sensor 15 and the strain gauge 5 are respectively connected to the corresponding acquisition card 4 to achieve signal connection, and the wireless network is used to debug the test computer 13 system and the acquisition card 4 to establish communication signals. The hydraulic system of the rock drill 6 is driven to control the rotation speed of the drill rod 4 through the multi-way valve group 11. At the same time, the hysteresis brake 3 is used to apply a load torque to the drill rod to generate a torsion on the drill rod 1. At this time, the strain gauge 5 can measure the electrical signal test data of the strain gauge. The test data is processed by the acquisition card 4 in the form of photoelectric signals and finally transmitted to the test computer 13. The test computer 13 processes the processed photoelectric signals again and finally displays and records the relevant data;

[0077] 3. When the hysteresis brake 3 on the rock drill rod 1 applies torque, the rotary torque test system works synchronously at this time, and the test computer outputs data to obtain the corresponding shear strain value. The rock drill 6 is measured to gradually increase the load under the rated working pressure and flow until the drill rod 1 stops rotating, and the shear strain data is collected and recorded by the test computer 13. Repeat the test 5 times and take the arithmetic mean of the maximum shear strain value.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A hydraulic rock drill rotary torque test device, comprising a rock drill hydraulic control system and a rotary torque test system, characterized in that: The rock drill hydraulic control system is composed of a motor, a hydraulic pump, a multi-way valve group, a speed regulating valve, a pressure gauge, a flow meter, a hydraulic cylinder, a rock drill and a drill rod; the rotary torque test system is composed of a reflective label, a hysteresis brake, a stress signal acquisition card, a strain gauge, a router, a speed data acquisition card, a speed sensor, and a test computer; The hydraulic control system of the rock drill controls the operation of the hydraulic cylinder and the rock drill through a multi-way valve group. The hydraulic cylinder moves the rock drill to the working position. After the rock drill obtains hydraulic power, the hydraulic motor inside the rock drill drives the drill rod to rotate, transmitting a large torque to the drill rod. The rock drill is welded above the fixed plate, and two cylinders with inner and outer through holes are welded below the fixed plate to cooperate with the cylindrical slide rail on the fixed bracket to facilitate the axial movement of the rock drill; The tail end of the hydraulic cylinder is welded in a bracket, and the end of the hydraulic cylinder with a rod end is welded to a fixed position of the rock drill; the function of the hydraulic cylinder is to control the rock drill to move to a working position; The principle of the rotary torque test system is as follows: a reflective label, a hysteresis brake, a speed sensor, a speed data acquisition card, a strain gauge, a strain signal acquisition card and a router are pasted on the drill rod, the speed sensor and the strain gauge are respectively connected to the corresponding acquisition cards, and a wireless network is used to debug the test computer system and the acquisition card to establish a communication signal; the hydraulic system of the rock drill is driven to control the rotation speed of the drill rod through a multi-way valve group, and a load torque is applied to the drill rod by a hysteresis brake to cause a torsion on the drill rod. At this time, the strain gauge measures the electrical signal test data of the shear strain, and the test data is finally transmitted to the test computer in the form of a photoelectric signal after being processed by the acquisition card. The test computer processes the processed photoelectric signal again, and finally displays and records the relevant data, starts the test bench, sets the rock drill under the rated working pressure and flow, gradually increases the load until the drill rod stops rotating, and collects and records the shear strain data through the computer; repeats the test 5 times, and takes the arithmetic mean of the maximum shear strain value.

2. A hydraulic rock drill rotation torque testing device according to claim 1, characterized in that: The maximum load of the test should not be less than 80% of the maximum working load of the equipment; Strain data acquisition system requirements: range not less than ±5000με; indication error not greater than 1% or ±5με; sampling frequency not less than 1kHz; maximum size of acquisition equipment not greater than 100mm; total weight of acquisition equipment not greater than 500g; The drill rod is made of 30CrMoNiV, and its mass length is equivalent to the piston length of the hydraulic rock drill. The working environment temperature of the strain gauge is 10℃~35℃, the compressed air temperature is 10℃~35℃, and the atmospheric pressure is 96±10kPa; the sensitive grid length is not greater than 1mm; the resistance is not less than 120Ω; the indication error is not greater than 1% or ±5με.

3. A hydraulic rock drill rotation torque testing device according to claim 1, characterized in that: The rock drill hydraulic cylinder and the multi-way valve group are connected by 6 sections of hose with a diameter of 30mm and a length of 3m.

4. A hydraulic rock drill rotation torque test device according to claim 1, characterized in that: The hydraulic oil type meets the requirements of GB / T11118.1-2011.

5. A hydraulic rock drill rotation torque test device according to claim 1, characterized in that: Finally, data processing is performed and the maximum shear strain of the rock drill's rotary torque is calculated according to formula (1): …………………………………………（1） Where: ——maximum shear stress, in megapascals (MPa); ——the shear modulus of elasticity of the elastic shaft, dimensionless; ——maximum shear strain, dimensionless; The torsional section coefficient is calculated according to formula (2): …………………………………（2） …………………………………………………（3） Where: ——Torsional section coefficient, in cubic millimeters (mm 3 ); D ——Outer diameter of the drill rod, in millimeters (mm); d ——Inner diameter of the drill rod, in millimeters (mm); According to the relationship between torque and shear strain, the torque is calculated according to formula (3): …………………………………………（4） Where: T ——Slewing torque of the slewing mechanism, in Newton meters (N·m); The important parameters of the hydraulic rock drill's rotary torque can be calculated through data processing.

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