Electric drive type transformation car frame structure and method for hydraulic system of horizontal directional drilling machine

Abstract

The invention discloses a horizontal directional drilling machine hydraulic system electric drive type transformation trolley structure and method, and the method comprises the following steps: calculating the output rotating speed and the output torque of a newly added motor according to the function and related parameters of a hydraulic motor in an original drilling machine hydraulic system, and selecting a motor with a proper model; designing and planning an overall motor control scheme; disassembling a hydraulic system part assembly of the original drilling machine, wherein the hydraulic system part assembly comprises a hydraulic motor, all hydraulic oil pipelines and valves; checking and maintaining or repairing the remaining mechanical part of the hydraulic system of the original drilling machine; manufacturing a machined part, and purchasing a motor and matched parts; the size of original drilling machine equipment is measured, the position of newly-added equipment is planned, and assembling of the newly-added equipment is completed; a corresponding connecting cable is matched according to the electric equipment; and the equipment can be put into production and use after being debugged to be qualified. The electric drive type drilling machine has the beneficial effects that an existing hydraulic drive type horizontal directional drilling machine is transformed into the electric drive type drilling machine, and the problems that the size of an existing hydraulic drive type drilling machine is not matched with the size of an electric drive type drilling machine, and the rotating speed and the output torque of a newly-added motor are different from those of an original hydraulic motor are solved; and the equipment cost can be greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment, specifically to a structure and method for the electric drive conversion of a hydraulic system for a horizontal directional drilling rig. Background Technology

[0002] Horizontal directional drilling rigs are trenchless technology products widely used for laying or upgrading pipelines for water supply, gas, electricity, telecommunications, natural gas, and oil. Existing horizontal directional drilling rigs are hydraulically driven, requiring the conversion of chemical energy into mechanical energy, and then into hydraulic energy—an extra stage of energy conversion, resulting in some energy loss. Furthermore, horizontal directional drilling rigs do not operate at full load continuously; most of the time, they operate at only 10-30% load, and the larger the rig tonnage, the more frequent these low-load operating conditions. Hydraulic system rigs, however, maintain high-pressure hydraulic oil circulation to keep the hydraulic system functioning properly, resulting in significant energy loss. Under low-load conditions, energy loss accounts for at least 70%. Moreover, fuel consumption in directional drilling projects is continuously increasing, accounting for approximately 10-15% of the total cost. Electric drilling rigs, when connected to grid power, only consume electricity when the equipment is in operation, unlike diesel-hydraulic generators which constantly consume fuel. When using generator power, the equipment considers both single and dual generator operation modes. Under low load conditions, a single generator can drive the rig normally. When a heavy load occurs, an additional generator can be added to provide power. By flexibly switching between these two power supply modes, energy conservation and consumption reduction can be achieved.

[0003] Against the backdrop of environmental protection and energy transition, the electric drive transformation of horizontal directional drilling rigs is not only a technological innovation, but also a concrete practice of the concept of sustainable development.

[0004] Currently, diesel-hydraulic horizontal directional drilling rigs remain the mainstream product in the market. A few horizontal directional drilling rig manufacturers have developed and produced a limited number of electric-drive rigs, all based on newly developed systems and architectures. However, purchasing new electric-drive horizontal directional drilling rigs incurs costs and can leave existing hydraulic horizontal directional drilling rigs idle. In contrast, retrofitting traditional hydraulic horizontal directional drilling rigs by replacing the traditional fuel-hydraulic system with an electric drive system can significantly reduce emissions and noise while improving equipment operating efficiency and reliability. However, there are currently very few electric-drive horizontal directional drilling rigs that have been retrofitted from existing diesel-hydraulic horizontal directional drilling rigs on the market.

[0005] Currently, the existing technology mainly involves newly developed electrically driven horizontal directional drilling rigs. These rigs all possess relatively mature design technologies. However, the electric drive retrofitting of diesel-hydraulic drilling rigs, constrained by the principle of reusing the existing rigs, requires addressing the following issues:

[0006] 1) The size difference between electric motors and hydraulic motors. Because hydraulic motors are smaller in size, the original drilling rig's hydraulic motor space is compact, making it difficult to replace them with electric motors.

[0007] 2) Due to the difference in drilling speed and output torque between the electric motor and the hydraulic motor, the original drilling rig's reducer ratio and original transmission ratio are different. The original reducer is utilized as much as possible, and the reducer is modified as little as possible to meet the transmission ratio of the electric motor.

[0008] 3) The main purpose of electric drilling rigs is to reduce energy consumption and thus construction costs. Depending on the different application scenarios, electric drilling rigs can achieve varying degrees of energy saving and consumption reduction. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a structure and method for converting the hydraulic system of a horizontal directional drilling rig into an electrically driven platform, thereby transforming the existing hydraulic system of the drilling rig into an electrically driven system.

[0010] The technical solution adopted in this invention is: a platform structure for the electric drive modification of the hydraulic system of a horizontal directional drilling rig, including a platform, a push-pull motor, a push-pull reducer, a rotary motor, a rotary reducer, a transmission box, and a rotary shaft;

[0011] The push-pull motor, push-pull reducer, rotary motor, rotary reducer, transmission box, and gear are all mounted on the platform; the output end of the push-pull motor is connected to the input end of the push-pull reducer, the output end of the push-pull reducer is connected to the gear shaft, and the gear meshes with the rack on the drilling rig frame.

[0012] The output end of the rotary motor is connected to the input end of the transfer case, the output end of the transfer case is connected to the input end of the rotary reducer, the output end of the rotary reducer is connected to the input end of the transmission box, and the output end of the transmission box is connected to the rotary shaft.

[0013] According to the above scheme, there are four sets of rotary motors, including two sets of rotary motors A and two sets of rotary motors B, and two rotary reducers A and two rotary reducers B are set accordingly. The four rotary reducers are set in pairs on both sides of the transmission box, with rotary reducer A located on the left side of the transmission box and rotary reducer B located on the right side of the transmission box.

[0014] According to the above scheme, a transfer case A is set on the left side of the two rotary reducers A; two sets of rotary motors A are respectively set on the front and rear sides of the transmission box, the output end of the rotary motor A is connected to the input end of the transfer case A, the output end of the transfer case A is connected to the input end of the rotary reducer A, and the rotary reducer A is set on the left side of the transmission box.

[0015] According to the above scheme, a transfer case B is set on the right side of the two rotary reducers B; both sets of rotary motors B are located on the right side of the transmission box, the output end of the rotary motor B is connected to the input end of the transfer case B, the transfer case B is located on the right side of the rotary reducer B, the output end of the transfer case B is connected to the input end of the rotary reducer B, and the output end of the rotary reducer B is connected to the input end of the transmission box.

[0016] A method for retrofitting the hydraulic system of a horizontal directional drilling rig to electric drive, the method comprising the following steps:

[0017] Step 1: Based on the function and relevant parameters of the hydraulic motor in the original drilling rig hydraulic system, calculate the output speed and output torque of the new motor and select a suitable model of motor.

[0018] Step 2: Design and plan the overall motor control scheme;

[0019] Step 3: Disassemble some components of the original drilling rig's hydraulic system, including the hydraulic motor, all hydraulic oil lines and valves;

[0020] Step 4: Inspect, maintain, or repair the remaining mechanical parts of the original drilling rig's hydraulic system;

[0021] Step 5: Fabricate and process the parts, and purchase the motor and related components;

[0022] Step 6: Measure the dimensions of the hydraulic motor on the original drilling rig platform, plan the location of the new motor, and complete the assembly of the platform structure for the electric drive modification of the hydraulic system of the horizontal directional drilling rig.

[0023] Step 7: Match the corresponding connecting cable according to the electrical equipment;

[0024] Step 8: Equipment debugging. Once the equipment is successfully debugged, it can be put into production.

[0025] According to the above plan, the specific method for step one is as follows:

[0026] Calculate the relevant parameters of the motor used to drive the drilling rig's rotation, and determine the output speed of the rotary motor;

[0027] Calculate the relevant parameters of the motor used to drive the drilling rig's push-pull movement, and determine the output torque of the push-pull motor;

[0028] The motor is selected based on its output speed and torque, and by comprehensively considering its performance and price parameters.

[0029] According to the above scheme, in step six, when the space inside the original drilling rig where the hydraulic motor is installed is insufficient to install the motor, the transfer case is adjusted and / or added to install the new motor.

[0030] In step seven, the modified drilling rig is powered by either a single or dual generator. Specifically, the power supply interface of the drilling rig is designed to allow for either parallel or separate operation. At the rear of the interface, all electrical equipment of the drilling rig is divided into two groups, with each group using independent cables that are not interconnected. When a single generator is selected, both groups of electrical equipment are connected to this interface. When a dual generator is selected, the two groups of electrical equipment are isolated from each other and are powered by a separate generator, without being affected by whether the AC frequency is synchronized.

[0031] The beneficial effects of this invention are as follows: This invention transforms existing hydraulically driven horizontal directional drilling rigs into electrically driven drilling rigs. By adding and / or adjusting the transfer case within the rig structure, the problem of size mismatch between existing hydraulically driven and electrically driven drilling rigs is overcome. Furthermore, by adding a reduction stage to the original reducer, the speed and output torque of the new motor differ from the original hydraulic motor. Compared to directly purchasing an electrically driven drilling rig, this significantly reduces equipment costs, improves construction efficiency, and reduces equipment maintenance. Given the large number of traditional hydraulic drilling rigs on the market, the technical solution described in this invention has broad prospects. Attached Figure Description

[0032] Figure 1 This is a front view of the drilling rig modification platform structure in this embodiment.

[0033] Figure 2 This is a top view of the original embodiment before modification.

[0034] Figure 3 This is the modified left view of this embodiment.

[0035] Figure 4 This is the right view after the modification in this embodiment.

[0036] Figure 5 This is the front view after the modification in this embodiment.

[0037] Figure 6 This is a top view of the modified embodiment.

[0038] Figure 7 This is the modified left view of this embodiment.

[0039] Figure 8 This is the right view after the modification in this embodiment.

[0040] Figure 9 This is a three-dimensional schematic diagram of the modified embodiment.

[0041] Figures 5-8In the middle: 1. Push-pull motor; 2. Brake; 3. Push-pull reducer (for connection to the push-pull motor); 4. Gear; 5. Rotary motor A (the two rotary motors in the middle); 6. Rotary motor B (the two rotary motors on the right); 7. Rotary reducer A (for connection to rotary motor A); 8. Transfer case A (for connection to rotary motor A); 9. Transfer case B; 10. Rotary reducer B (for connection to rotary motor B); 11. Rotary shaft; 12. Transmission box; 13. Car platform.

[0042] Figures 1-4 In the middle: 4. Gear; 11. Rotary shaft; 12. Transmission box; 13. Car platform; 14. Push-pull hydraulic motor; 15. Rotary hydraulic motor; 16. Push-pull reducer; 17. Rotary reducer. Detailed Implementation

[0043] To better understand the present invention, it will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] Example

[0045] The original horizontal directional drilling rigs (hereinafter referred to as the original drilling rigs) were all fully hydraulic drilling rigs. The hydraulic system included hydraulic motors for pushing and pulling and rotating, related hydraulic pipelines and solenoid valves, etc. The power was mainly driven by a diesel engine to rotate the hydraulic pump. The power was transmitted to the hydraulic motor through high-pressure hydraulic oil. The hydraulic motor was connected to the push-pull reducer. The push-pull reducer drove the push-pull gear to realize the back-and-forth movement of the platform relative to the drilling rig frame (the drilling rig frame is equipped with a rack that meshes with the gear). The hydraulic motor was connected to the rotary reducer. The rotary reducer drove the gearbox gear to realize the rotation of the gearbox spindle, thereby realizing various functions such as loading and unloading drill rods on the drilling rig.

[0046] This embodiment modifies the hydraulic system of a DD625 horizontal directional drilling rig, replacing the original hydraulic system with an electric drive system. The original drilling rig had a thrust-pull force of 283 tons and a maximum torque of 108,500 Nm. The modification scheme involves changing the original hydraulic transmission system to an electric motor drive. The original reducer is retained, and in principle, the transmission force is not increased.

[0047] A method for retrofitting the hydraulic system of a horizontal directional drilling rig to electric drive, the method comprising the following steps:

[0048] Step 1: Based on the function and relevant parameters of the hydraulic motor in the original drilling rig hydraulic system, calculate the output speed and output torque of the new motor and select a suitable motor model.

[0049] In this embodiment, based on the principle of reusing existing equipment, the original drilling rig uses four sets of rotary reducers plus hydraulic motors to achieve its rotation function, with a rotary reduction ratio of 1:40; and four sets of travel reducers plus hydraulic motors to achieve its push-pull travel function, with a push-pull travel reduction ratio of 1:25. Since the motor speed is much higher than the original hydraulic motor speed, to reduce the speed, a 1:5 reducer is added to the existing reducers, bringing the total reduction ratio to 1:125; that is, the reducer for the new motor adds one stage of reduction to match the speed of the original drilling rig.

[0050] 1) Calculate the relevant parameters of the motor used to drive the drilling rig to rotate, and determine the output speed of the rotating motor.

[0051] In this embodiment, the relevant parameters for the original drilling rig's rotational operation are as follows: transfer case reduction ratio is 1:40; maximum rotational torque is 224 kNm; maximum rotational speed is 67.5 RPM; rated rotational speed is 112 kNm; rated rotational torque is 37.5 RPM. The final requirements for rotational torque are: maximum output torque not less than 100,000 Nm, and rated speed of 30 rpm.

[0052] In this embodiment, the original drilling rig hydraulic system includes four rotary positions (installing four hydraulic motors originally used to drive the drilling rig's rotation), allowing for simultaneous operation of four motors. Based on the reduction ratio, the motor speed is calculated to be between 1000 rpm and 1500 rpm, with an output torque of 625 Nm. A motor rotating at 1000 rpm will ultimately output a speed of 25 rpm; a motor rotating at 1500 rpm will ultimately output a speed of 37.5 rpm.

[0053] 2) Calculate the relevant parameters of the motor used to drive the drilling rig to push and pull, and determine the output torque of the push and pull motor.

[0054] In this embodiment, the relevant parameters of the original drilling rig's push-pull action are as follows: transfer case reduction ratio: first-stage speed ratio (1:5) (preliminary consideration, can be customized and changed), second-stage speed ratio (1:25); maximum push-pull force is 4000KN; maximum speed of push-pull action is 21.6RPM; rated speed of push-pull part is 12RPM; rated push-pull force of push-pull part is 2622KN; pitch circle diameter is 320mm, corresponding to a travel distance of 1m per revolution.

[0055] The drilling rig track is approximately 10m long, and the entire travel time must be controlled within 1.5 minutes, therefore the output speed must not be less than 6.7rpm.

[0056] In this embodiment, the original drilling rig hydraulic system includes four push-pull travel positions (installing four hydraulic motors originally used to drive the drilling rig's push-pull movement). Four push-pull motors can be used to replace the hydraulic motors and operate simultaneously. Based on the reduction ratio, the motor speed is calculated to be 1000 rpm, and the travel speed is 8 m / min. Taking a single motor outputting 50 tons of thrust as an example, the required motor output torque is 627 Nm. Taking 75 tons of thrust as an example, the required motor output torque is 940 Nm. Taking 100 tons of thrust as an example, the required motor output torque is 1254 Nm.

[0057] (3) Based on the output speed and torque of the motor, and taking into account the motor performance and price parameters, select the motor and modify the original reducer to add a reduction stage.

[0058] In this embodiment, based on design requirements, motor performance, and motor price, a Langgao horizontal directional drilling rig-specific motor, model YQW3-225C2-10A-RA2, is to be selected; the frequency converter matched with the motor is an Huichuan vehicle-mounted frequency converter, model ICMD10 series dual drive (LD32); and a Huichuan vehicle-mounted rectifier unit, model CMR10-250, is to be matched with it.

[0059] Step 2: Plan the overall electronic control process and power circuit diagram.

[0060] Based on the selected motor and the control requirements for the motor (controlling speed, torque, etc.), design the overall motor control scheme and create the motor control flowchart and power system diagram.

[0061] In this invention, the speed and torque of the motor are controlled to enable the drilling rig to rotate and push-pull walking functions to meet production requirements. In this embodiment, the design and fabrication of the motor control scheme, motor control flowchart, and power system diagram can all be carried out using existing conventional technologies.

[0062] In this invention, the modified drilling rig can be powered by either a single generator or two generators. Specifically, the power supply interface on the drilling rig is designed with two selectable modes: parallel or separate operation. At the rear of the interface, all electrical equipment on the drilling rig is divided into two groups, each with its own independent cable. When using a single generator, both groups of equipment are connected to this interface; when using two generators, the two groups are isolated and powered by their own generators, unaffected by AC frequency synchronization.

[0063] Step 3: Disassemble some components of the original drilling rig's hydraulic system, including the hydraulic motor, all hydraulic oil lines and valves.

[0064] In this embodiment, the original drilling rig's eight hydraulic motors, all hydraulic oil pipelines, solenoid valves, and the corresponding control circuits of the solenoid valves are disassembled.

[0065] Step 4: Inspect, maintain, or repair the remaining mechanical parts of the original drilling rig's hydraulic system.

[0066] In this invention, the mechanical parts that are retained are mainly the frame and transmission parts of the original drilling rig, such as the reducer and the gears and racks that drive the drilling rig.

[0067] Step 5: Fabricate and process the parts, and purchase the motor and related components, including the rectifier and motor driver.

[0068] The machined parts in this invention include planetary gears that increase the reduction ratio, and a transmission box that separates the motor.

[0069] Step Six: Measure the dimensions of the hydraulic motor on the original drilling rig platform, plan the location of the new motor, and complete the assembly of the platform structure for the electric drive conversion of the horizontal directional drilling rig's hydraulic system. In this invention, when the space inside the original drilling rig is insufficient to install the hydraulic motor, the problem is solved by adjusting and / or adding a transfer case.

[0070] The hydraulic system of the drilling rig is mounted on the platform structure, allowing the platform to move relative to the rig frame. The original platform structure is as follows: Figures 1-4 As shown, the push-pull hydraulic motor 14, push-pull reducer 16, rotary hydraulic motor 15, rotary reducer 17, and gear 4 are all mounted on the platform 13. The push-pull hydraulic motor 14 is connected to the gear 4 axle through the push-pull reducer 16. The gear 4 meshes with the rack on the drilling rig frame. The push-pull hydraulic motor 14 drives the gear 4 to rotate through the push-pull reducer 16 and the gear axle, thus enabling the platform 13 to move forward and backward. The rotary hydraulic motor 15 transmits power to the rotary shaft 11 through the rotary reducer 17 and the transmission box 12, thus driving the rotary shaft 11 to rotate.

[0071] The platform structure after the original drilling rig was converted to electric drive is as follows: Figures 5-8 As shown. Demolition Figures 1-4 The hydraulic motor and its associated pipe valves (not shown) are installed in the original installation position of the hydraulic motor.

[0072] In this embodiment, the original drilling rig's hydraulic motors are 200×100×150mm in size, while the electric motors are 500×500×600mm, which is much larger. The spatial structure of the original drilling rig's hydraulic system cannot meet the installation requirements of the electric motors: 1. The two rotary motors at the far right (i.e. Figure 7 The rotary motor (B6) in the original drilling rig used a hydraulic motor, and the two reducers (i.e. Figure 7 The center spacing of the rotary reducers B10 in the middle is only 360mm, which cannot meet the requirement of parallel placement of the motors. Therefore, two transfer cases B9 are used, one in front of the other. The rotary motor in the middle (i.e.,...) Figure 7In addition to this issue, the rotating motor A5 also suffers from insufficient space on the left side (if the horizontally mounted motor does not rotate, it will conflict with the vertically mounted motor, making installation impossible). Therefore, in addition to adding a transfer case A8, it is also necessary to make the motor reverse direction (i.e., Figure 7 The two rotary motors (A5) in the machine are used to meet the assembly space requirements. The modified machine connection structure is as follows:

[0073] A platform structure for the electric drive modification of the hydraulic system of a horizontal directional drilling rig includes a platform 13, a push-pull motor 1, a push-pull reducer 3, a rotary motor, a rotary reducer, a transmission box 12, and a rotary shaft 11.

[0074] The push-pull motor 1, push-pull reducer 3, rotary motor, rotary reducer, transmission box 12 and gear are all mounted on the platform 13; the output end of the push-pull motor 1 is connected to the input end of the push-pull reducer 3, the output end of the push-pull reducer 3 is connected to the gear shaft, and the gear meshes with the rack on the drilling rig frame.

[0075] The output end of the rotary motor is connected to the input end of the transfer case, the output end of the transfer case is connected to the input end of the rotary reducer, the output end of the rotary reducer is connected to the input end of the transmission box 12, and the output end of the transmission box 12 is connected to the rotary shaft 11.

[0076] The walking function works as follows: the push-pull motor 1 drives the gear shaft to rotate through the push-pull reducer 3, and the gear rotates accordingly and meshes with the rack on the drilling rig frame, thereby realizing the forward and backward movement of the platform 13.

[0077] The principle of the rotation function is as follows: the rotary motor transmits power to the rotary shaft 11 through the rotary reducer and the transmission box 12, thereby driving the rotary shaft 11 to rotate; this is common knowledge in the industry and will not be elaborated here.

[0078] In this embodiment, there are four sets of push-pull motors 1, arranged in pairs opposite each other and located at the left end of the platform 13. Each push-pull motor 1 is respectively equipped with a push-pull reducer 3; at least one set of push-pull motors 1 is equipped with a brake 2.

[0079] In this embodiment, there are four sets of rotary motors, including two sets of rotary motors A5 and two sets of rotary motors B6, and two rotary reducers A7 and two rotary reducers B10 are correspondingly provided. The four rotary reducers are arranged in pairs on both sides of the transmission box 12, with rotary reducer A7 located on the left side of the transmission box 12 and rotary reducer B7 located on the right side of the transmission box 12.

[0080] In this embodiment, a transfer case A8 is provided on the left side of the two rotary reducers A7; two sets of rotary motors A5 are respectively located on the front and rear sides of the transmission box 12. The output end of the rotary motor A5 is connected to the input end of the transfer case A8, and the output end of the transfer case A8 is connected to the input end of the rotary reducer A7. The rotary reducer A7 is located on the left side of the transmission box 12 (that is, the end closer to the push-pull motor 1).

[0081] In this embodiment, a transfer case B9 is provided on the right side of the two rotary reducers B8; two sets of rotary motors B6 are both located on the right side of the transmission box 12, and the output end of the rotary motor B6 is connected to the input end of the transfer case B9. The transfer case B9 is located on the right side of the rotary reducer B10, and the output end of the transfer case B9 is connected to the input end of the rotary reducer B10. The output end of the rotary reducer B10 is connected to the input end of the transmission box 12.

[0082] In this embodiment, the modified push-pull reducer and rotary reducer are both modified from the original drilling rig reducer by adding a reduction stage according to the design requirements.

[0083] Step 7: Match the corresponding connecting cable according to the electrical equipment.

[0084] Step 8: Equipment debugging. Once the equipment is successfully debugged, it can be put into production.

[0085] The modified drilling rig was then tested to ensure its performance met the requirements.

[0086] In this embodiment, the relevant parameters of the drilling rig before and after modification are shown in Table 1.

[0087] Table 1. Relevant parameters before and after drilling rig modification.

[0088]

[0089]

[0090] The parameters in Table 1 are all standard parameters in the industry, and will not be elaborated further here.

[0091] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0092] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic system electric drive conversion platform structure for a horizontal directional drilling rig, characterized in that, Includes a platform, push-pull motor, push-pull reducer, rotary motor, rotary reducer, transmission box, and rotary shaft; The push-pull motor, push-pull reducer, rotary motor, rotary reducer, transmission box, and gear are all mounted on the platform; the output end of the push-pull motor is connected to the input end of the push-pull reducer, the output end of the push-pull reducer is connected to the gear shaft, and the gear meshes with the rack on the drilling rig frame. The output end of the rotary motor is connected to the input end of the transfer case, the output end of the transfer case is connected to the input end of the rotary reducer, the output end of the rotary reducer is connected to the input end of the transmission box, and the output end of the transmission box is connected to the rotary shaft.

2. The platform structure as described in claim 1, characterized in that, The rotary motor has four sets, including two sets of rotary motor A and two sets of rotary motor B, and two rotary reducers A and two rotary reducers B are set accordingly. The four rotary reducers are set in pairs on both sides of the transmission box, with rotary reducer A located on the left side of the transmission box and rotary reducer B located on the right side of the transmission box.

3. The platform structure as described in claim 2, characterized in that, A transfer case A is located on the left side of the two rotary reducers A; two sets of rotary motors A are located on the front and rear sides of the transmission box respectively. The output end of the rotary motor A is connected to the input end of the transfer case A, and the output end of the transfer case A is connected to the input end of the rotary reducer A. The rotary reducer A is located on the left side of the transmission box.

4. The platform structure as described in claim 1, characterized in that, A transfer case B is located on the right side of the two rotary reducers B; two sets of rotary motors B are located on the right side of the transmission box, and the output end of the rotary motor B is connected to the input end of the transfer case B. The transfer case B is located on the right side of the rotary reducer B, and the output end of the transfer case B is connected to the input end of the rotary reducer B. The output end of the rotary reducer B is connected to the input end of the transmission box.

5. A method for electrically driven retrofitting of a hydraulic system for a horizontal directional drilling rig, characterized in that, The method includes the following steps: Step 1: Based on the function and relevant parameters of the hydraulic motor in the original drilling rig hydraulic system, calculate the output speed and output torque of the new motor, and select a suitable model of motor and matching reducer. Step 2: Design and plan the overall motor control scheme; Step 3: Disassemble some components of the original drilling rig's hydraulic system, including the hydraulic motor, all hydraulic oil lines and valves; Step 4: Inspect, maintain, or repair the remaining mechanical parts of the original drilling rig's hydraulic system; Step 5: Fabricate and process the parts, and purchase the motor and related components; Step 6: Measure the dimensions of the hydraulic motor on the original drilling rig platform, plan the location of the new motor, and complete the assembly of the platform structure for the electric drive modification of the hydraulic system of the horizontal directional drilling rig as described in any one of claims 1 to 4. Step 7: Match the corresponding connecting cable according to the electrical equipment; Step 8: Equipment debugging. Once the equipment is successfully debugged, it can be put into production.

6. The method for converting the hydraulic system of a horizontal directional drilling rig to electric drive mode as described in claim 5, characterized in that, The specific method for step one is as follows: Calculate the relevant parameters of the motor used to drive the drilling rig's rotation, and determine the output speed of the rotary motor; Calculate the relevant parameters of the motor used to drive the drilling rig's push-pull movement, and determine the output torque of the push-pull motor; The motor is selected based on its output speed and torque, and by comprehensively considering its performance and price parameters.

7. The method for converting the hydraulic system of a horizontal directional drilling rig to electric drive mode as described in claim 5, characterized in that, In step six, if the space inside the original drilling rig where the hydraulic motor is installed is insufficient to install the motor, the transfer case is adjusted and / or added to install the new motor.

8. The method for converting the hydraulic system of a horizontal directional drilling rig to electric drive mode as described in claim 5, characterized in that, In step seven, the modified drilling rig is powered by either a single or dual generator. Specifically, the power supply interface of the drilling rig is designed to allow for either parallel or separate operation. At the rear of the interface, all electrical equipment of the drilling rig is divided into two groups, with each group using independent cables that are not interconnected. When a single generator is selected, both groups of electrical equipment are connected to this interface. When a dual generator is selected, the two groups of electrical equipment are isolated from each other and are powered by a separate generator, without being affected by whether the AC frequency is synchronized.

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