Composite lead sealing method and system for deep well diversion cable and feed rod welding head

Abstract

The invention relates to the technical field of electrical connection, and discloses a composite lead sealing method and system for a deep well diversion cable and a feed rod welding joint, a lead coating method and a mold lead sealing method are combined, a first lead coating layer is convenient for controlling lead sealing temperature, manually coating lead-tin alloy and preventing heat from damaging a cable insulating layer; and the second layer is a mold lead sealing layer, so that the thickness of the lead sealing layer in each direction can be conveniently controlled, and the boundary dimension of the lead sealing layer can be conveniently controlled.

Description

Technical Field

[0001] The invention relates to the technical field of electrical connection, and in particular to a composite lead sealing method and system for a welding joint of a deep well guide cable and a feeder rod. Background Art

[0002] In the electrical installation of deep well vertical grounding electrodes for DC transmission projects, the connection between the guide cable and the feeder rod is very important. The connection point is usually tens or hundreds of meters underground. Once a fault occurs, no remedial measures can be taken. With the promotion of deep well vertical grounding electrode technology, the connection process between the guide cable and the feeder rod has received more and more attention.

[0003] At present, in deep well operations, the sealing protection of the welding joints of the guide cable and the feeder rod is a key link to ensure the safety and stability of power transmission. One of the commonly used lead sealing methods in this field is the lead enamelling method. The traditional lead sealing method mainly relies on manual operation to complete the lead sealing operation. In the actual deep well test grounding electrode project, the welding points of the guide cable and the feeder rod often present irregular shapes. This irregular shape brings great difficulties to manual operation. It is difficult for operators to ensure the uniform distribution of lead-tin alloy in all directions of the welding joint by manual operation and visual judgment, so it is difficult to ensure that the lead sealing thickness in all directions of the welding joint can be kept consistent, and it is impossible to meet the high quality requirements of the deep well test grounding electrode project for the sealing of the welding joints of the guide cable and the feeder rod. Summary of the invention

[0004] The invention provides a composite lead sealing method and system for a welding joint between a deep well guide cable and a feeder rod, solving the technical problem of how to improve the sealing performance of the welding joint between the deep well guide cable and the feeder rod.

[0005] The first aspect of the present invention provides a composite lead sealing method for a welding joint between a deep well current guiding cable and a feeder rod, comprising:

[0006] Respond to lead sealing job requests and build lead sealing molds;

[0007] Preparing lead-tin alloy and pre-treating it;

[0008] According to the preset lead-plating requirements, the lead-tin alloy after pretreatment is used to lead-plating the lead sealing part of the welding joint between the deep well guide cable and the feeder rod;

[0009] The lead sealing mold is sleeved on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and the lead sealing operation is performed.

[0010] Optionally, responding to the lead sealing operation request and constructing a lead sealing mold includes:

[0011] In response to a lead sealing operation request, determine a lead sealing position of a welding joint between a deep well flow guiding cable and a feed rod corresponding to the lead sealing operation request;

[0012] Acquire structural parameters associated with the lead sealing portion of the deep well current guiding cable and the feed rod welding joint;

[0013] Based on the three-dimensional modeling software, the target mold model is created using the structural parameters;

[0014] Exporting the target mold model to a format file that meets the machine tool recognition requirements;

[0015] The format file is read by a machine tool, and the mold is processed according to preset processing requirements to generate a lead sealing mold.

[0016] Optionally, creating a target mold model using the structural parameters based on three-dimensional modeling software includes:

[0017] Use the stretching tool to create the mold body model;

[0018] According to the structural parameters, a geometric model of each component included in the lead sealing part of the welding joint between the deep well guide cable and the feed rod is created;

[0019] Performing a summation operation on the geometric body models of each component to generate a composite geometric body model;

[0020] Based on the mold main body model, performing a difference operation on the composite geometric body model to obtain an initial mold model with a lead-sealed composite cavity;

[0021] A lead pouring port geometry model of the initial mold model is created, and based on the initial mold model, a subtraction operation is performed on the lead pouring port geometry model to obtain a target mold model with a lead pouring port.

[0022] Optionally, the preset processing requirement is specifically to process into a symmetrical and detachable lead sealing mold, and the lead sealing thickness in any direction of the welding head surface after the lead sealing operation is performed using the lead sealing mold is 10 mm.

[0023] Optionally, the lead sealing mold is made of carbon graphite.

[0024] Optionally, the mass ratio of lead to tin in the lead-tin alloy is (6-7): (3-4).

[0025] Optionally, the preprocessing includes:

[0026] The lead-tin alloy is heated at a temperature of 180-250° C. until the lead-tin alloy is in a semi-molten state.

[0027] Optionally, the preset lead plating requirement is specifically that the lead plating is performed at least twice.

[0028] Optionally, the lead sealing operation includes:

[0029] The lead raw material is subjected to a stepwise heating treatment to obtain molten lead water;

[0030] Pour the molten lead into the mold, and disassemble the lead sealing mold after the molten lead is cooled and solidified.

[0031] The second aspect of the present invention provides a composite lead sealing system for a deep well current guiding cable and a feeder rod welding joint, comprising:

[0032] The response module is used to respond to the lead sealing operation request and build the lead sealing mold;

[0033] A pretreatment module, used for preparing and pretreating the lead-tin alloy;

[0034] A lead-plating module is used to use the pre-treated lead-tin alloy to plate the lead sealing part of the welding joint between the deep well guide cable and the feed rod according to the preset lead-plating requirements;

[0035] The lead sealing module is used to sleeve the lead sealing mold on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and perform the lead sealing operation.

[0036] It can be seen from the above technical solutions that the present invention has the following advantages:

[0037] The present invention proposes a composite lead sealing method and system for the welding joint of a deep well guide cable and a feeder rod, which is applied to deep well test grounding electrode projects. The lead sealing operation is carried out by coordinating the lead enameling method with the mold lead sealing method. The lead enameling method can avoid damage to the insulation layer, and the mold lead sealing can ensure the uniform distribution of the lead-tin alloy, thereby ultimately achieving a good sealing effect and meeting the high quality requirements of the deep well test grounding electrode project for the welding joint sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 A flow chart of the steps of a composite lead sealing method for a deep well current guiding cable and a feeder rod welding joint provided in the first embodiment of the present invention;

[0040] Figure 2 A flow chart of the steps of a composite lead sealing method for a deep well current guiding cable and a feeder rod welding joint provided in the second embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the lead-plated package layer;

[0042] Figure 4 This is a schematic diagram of the lead sealing mold;

[0043] Figure 5 It is the lead-tin balance diagram;

[0044] Figure 6 This is a schematic diagram of the mold sealing lead layer;

[0045] Figure 7 This is a schematic diagram of the lead seal mold installation;

[0046] Figure 8 This is a schematic diagram of thermocouple installation for measuring insulation.

[0047] Fig. 9 It is the temperature variation curve of point A;

[0048] Fig.10 It is the temperature variation curve of point B;

[0049] Fig.11 It is the temperature variation curve of point C;

[0050] Fig.12 It is the temperature variation curve of point D;

[0051] Fig.13 This is a structural block diagram of a composite lead sealing system for a deep well current guiding cable and a feeder rod welding joint provided in the third embodiment of the present invention. DETAILED DESCRIPTION

[0052] The embodiment of the present invention provides a composite lead sealing method and system for a welding joint between a deep well guide cable and a feeder rod, which is used to solve the technical problem of how to improve the sealing performance of the welding joint between a deep well guide cable and a feeder rod.

[0053] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0054] Since the melting point of lead is 327°C, if the sealing is performed directly by pouring lead into the mold, the lead water melted into liquid at high temperature will damage the insulation layer of the guide cable, resulting in a safety hazard at the connection between the guide cable and the feed rod.

[0055] The traditional lead-plating method, using lead-tin alloy, can control the temperature very well. However, since it is a manual operation, the welding point between the guide cable and the feed rod is irregular in shape, and it is difficult to ensure that the lead sealing thickness in all directions of the welding head is consistent.

[0056] Therefore, the connection between the deep-well vertical grounding electrode guide cable and the feeding rod is carried out by exothermic welding using an adapter. The shape of the welding head is irregular, and the lead enamelling method and the mold lead sealing method are coordinated to carry out a composite lead sealing operation, which can effectively solve the above problems.

[0057] See also Figure 1 , Figure 1 A flow chart of the steps of a composite lead sealing method for a welding joint between a deep well guide cable and a feed rod provided in Embodiment 1 of the present invention.

[0058] The present invention provides a composite lead sealing method for a deep well current guiding cable and a feeder rod welding joint, comprising:

[0059] Step 101: respond to a lead sealing operation request and construct a lead sealing mold.

[0060] The lead sealing operation request refers to the request instruction for the lead sealing operation at the connection between the deep well guide cable and the feed rod welding head of the deep well test grounding electrode project.

[0061] In an embodiment of the present invention, in response to a received request instruction for performing a lead sealing operation on a connection between a deep well flow guide cable and a feed rod welding joint for a deep well test grounding electrode project, the request is read and a lead sealing mold is constructed.

[0062] Step 102: prepare a lead-tin alloy and perform pretreatment.

[0063] In an embodiment of the present invention, a lead-tin alloy is prepared, and the prepared lead-tin alloy is heated to make it in a semi-solid state to facilitate lead plating operations.

[0064] Step 103: Lead-plating the lead sealing part of the welding joint between the deep well guide cable and the feeder rod with the pre-treated lead-tin alloy according to the preset lead-plating requirements.

[0065] The preset lead-enamelling requirements refer to the pre-established lead-enamelling requirements to ensure that the lead sealing part of the welding joint between the deep well guide cable and the feeder rod has good electrical properties, mechanical properties and sealing properties.

[0066] In an embodiment of the present invention, the lead sealing part of the welding joint of the deep well guide cable and the feeder rod is lead-enameled using a pre-treated lead-tin alloy according to the preset lead-enameling requirements, thereby ensuring that the lead sealing part of the welding joint of the deep well guide cable and the feeder rod has good electrical properties, mechanical properties and sealing properties.

[0067] Step 104: Sleeve the lead sealing mold on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and perform the lead sealing operation.

[0068] In an embodiment of the present invention, the lead sealing mold is sleeved on the lead sealing part of the welding joint between the deep well guide cable and the feed rod to ensure that the mold fits tightly with the lead sealing part and the position is accurate, and then the lead sealing operation is carried out according to the established operating procedures.

[0069] In the present invention, in response to a lead sealing operation request, a lead sealing mold is constructed; a lead-tin alloy is prepared and pretreated; the lead sealing part of the welding joint of the deep well guide cable and the feeder rod is lead-enameled using the pretreated lead-tin alloy according to preset lead-enameling requirements; the lead sealing mold is sleeved on the lead sealing part of the welding joint of the deep well guide cable and the feeder rod, and the lead sealing operation is performed.

[0070] The present invention proposes a composite lead sealing method for the welding joint of a deep well guide cable and a feeder rod, which is applied to a deep well test grounding electrode project. The composite lead sealing operation is carried out by coordinating the lead enamelling method with the mold lead sealing method. Firstly, an adaptive lead sealing mold is constructed according to the irregular structural characteristics of the welding joint of the deep well guide cable and the feeder rod, which is a key prerequisite for ensuring that subsequent lead sealing operations can be carried out accurately and efficiently. Then, the lead enamelling method is used to lead the welding joint of the deep well guide cable and the feeder rod, thereby forming a lead enamel wrapping layer on the surface of the welding joint, which not only helps to achieve precise control of the lead sealing temperature, but also can effectively prevent damage to the cable insulation layer due to heat transfer during the lead sealing process, thereby ensuring the insulation performance and overall safety of the cable. Finally, the constructed lead sealing mold is used to perform lead sealing operations on the irregular structure at the welding joint. Through the standardized guidance of the mold, it can be ensured that the lead-tin alloy is evenly distributed in all directions of the welding joint, thereby keeping the lead sealing thickness consistent, and finally achieving a good sealing effect, meeting the high quality requirements of the deep well test grounding electrode project for welding joint sealing.

[0071] See also Figure 2 , Figure 2 A flow chart of the steps of a composite lead sealing method for a welding joint between a deep well guide cable and a feed rod provided in the second embodiment of the present invention.

[0072] The present invention provides a composite lead sealing method for a deep well current guiding cable and a feeder rod welding joint, comprising:

[0073] Step 201: respond to a lead sealing operation request and determine a lead sealing location of a welding joint between a deep well flow guiding cable and a feed rod corresponding to the lead sealing operation request.

[0074] In an embodiment of the present invention, in response to a received request instruction for performing a lead sealing operation on the connection between the deep well guide cable and the feed rod welding head for a deep well test grounding electrode project, the request is read and the lead sealing point of the deep well guide cable and the feed rod welding head corresponding to the lead sealing operation request is determined.

[0075] Step 202: Obtain structural parameters associated with the lead sealing portion of the welding joint between the deep well guide cable and the feed rod.

[0076] Structural parameters include but are not limited to the overall dimensions of the welding head, the dimensions of the cable and the feed rod, the relative position dimensions of the cable and the feed rod, the shape of the welding seam, the width and depth of the welding seam, the height and shape of the welding protrusion, and the depth and area of ​​the welding depression.

[0077] See also Figure 3 , Figure 3 This is a schematic diagram of the lead-lined sheath, which is the lead sealing part of the welding joint between the deep well guide cable and the feeder rod. The lead sealing part includes the feeder 1 (specifically the feeder rod body), the adapter 2, the welding head 3 (specifically the feeder rod welding head), the guide cable 4 and the lead-lined sheath 5.

[0078] In the embodiment of the present invention, structural parameters associated with the feeder 1, the adapter 2, the welding head 3 and the guide cable 4 at the lead sealing are obtained.

[0079] Step 203: Create a target mold model using structural parameters based on 3D modeling software.

[0080] Further, step 203 may include the following sub-steps:

[0081] S11. Call the stretching tool to create the mold main body model.

[0082] S12. Create geometric models of various components included in the lead sealing part of the welding joint between the deep well guide cable and the feed rod according to the structural parameters.

[0083] S13, performing a sum operation on the geometric body models of each component to generate a composite geometric body model.

[0084] S14. Based on the mold main body model, a subtraction operation is performed on the composite geometric body model to obtain an initial mold model with a lead-sealed composite cavity.

[0085] S15, creating a lead filling port geometry model of the initial mold model, and based on the initial mold model, performing a subtraction operation on the lead filling port geometry model to obtain a target mold model with the lead filling port.

[0086] In the embodiment of the present invention, please refer to Figure 4 , Figure 4The schematic diagram of the lead sealing mold includes a lead sealing mold 7 and a lead filling port 8. The stretching tool in the 3D modeling software is called to create a rectangular mold main body model. Then, according to the structural parameters, the geometric models of various components included in the lead sealing part of the deep well guide cable and the feed rod welding head are created. The component geometric models include the feeder geometric model, the adapter geometric model, the welding head geometric model and the guide cable geometric model. The Boolean algorithm is used to sum the geometric models of various components, and multiple component geometric models are integrated to generate a composite geometric model. In the mold main body model, the geometric model of each component is combined with the composite geometric model. The composite geometric model is subjected to a difference operation using a Boolean algorithm, and the composite geometric model is subtracted from the mold main body model to obtain an initial mold model with a lead-sealed composite cavity. At this time, a lead filling port 8 needs to be created for the initial mold model for subsequent lead-sealing operations. Therefore, a lead filling port geometric model of the initial mold model is created. For example, the lead filling port 8 is circular, so a cylindrical geometric model needs to be created. Then, the composite geometric model is subjected to a difference operation using a Boolean algorithm, and the lead filling port geometric model is subtracted from the initial mold model to obtain a target mold model with a lead filling port 8.

[0087] Step 204: export the target mold model into a format file that meets the machine tool recognition requirements.

[0088] In the embodiment of the present invention, the present invention utilizes CNC machine tools (Computer Numerical Control Machine Tools) to perform mold processing. Therefore, in order to import the three-dimensional processing data of the target mold model in the three-dimensional modeling software into the CNC machine tool, it is necessary to convert the format of the file exported by the three-dimensional modeling software into a format file that can be recognized and read by the CNC machine tool.

[0089] Step 205 , the format file is read by the machine tool, and the mold is processed according to the preset processing requirements to generate the lead sealing mold 7 .

[0090] Furthermore, the preset processing requirement is specifically to process into a symmetrical and detachable lead sealing mold 7, and the lead sealing thickness in any direction of the surface of the welding head 3 after the lead sealing operation is performed using the lead sealing mold 7 is 10 mm.

[0091] In an embodiment of the present invention, according to preset processing requirements, the lead sealing mold 7 needs to be processed into a symmetrical and detachable mold. The lead sealing mold 7 is divided into a left mold and a right mold. The detachable structure between the left mold and the right mold can be set according to actual needs, such as bolt connection, which is not limited here. At the same time, it is also necessary to design the lead sealing composite cavity in the lead sealing mold 7 so that the lead sealing thickness in any direction on the surface of the welding head 3 after the lead sealing operation using the lead sealing mold 7 is 10 mm, that is, the distance from the outer edge of the lead sealing composite cavity of the lead sealing mold 7 to the welding head 3 in all directions is consistent, which is 10 mm.

[0092] Furthermore, the material of the lead sealing mold 7 is carbon graphite.

[0093] In the embodiment of the present invention, the material of the lead sealing mold 7 is carbon graphite, and a high-density carbon graphite block is selected. The carbon graphite material has the advantages of good high temperature resistance, high thermal conductivity and low density, and it also has good chemical stability. It is not easy to react chemically with various materials (such as lead, etc.) used in the lead sealing process, thereby ensuring the surface quality and service life of the lead sealing mold 7, and will not cause corrosion, wear or other defects on the surface of the lead sealing mold 7 due to chemical reactions.

[0094] Step 206: prepare a lead-tin alloy and perform pretreatment.

[0095] Furthermore, the mass ratio of lead to tin in the lead-tin alloy is (6~7):(3~4).

[0096] Further, pre-processing includes:

[0097] The lead-tin alloy is heated at a temperature of 180-250°C until the lead-tin alloy is in a semi-molten state.

[0098] In the embodiment of the present invention, in order to prevent the lead sealing process from damaging the insulation layer of the cable, the melting temperature of the lead sealing solder should not be too high. Lead-tin alloy is an ideal solder, the melting point of lead is 327°C, and the melting point of tin is 232°C. According to physical and chemical theory, please refer to Figure 5 , Figure 5This is the lead-tin equilibrium diagram. A is the melting point of pure lead, which is 327°C. At this point, the lead completely changes from solid to liquid. When the temperature is higher than this point, the lead is in liquid state; when it is lower than this point, the lead is in solid state. B is the eutectic point, which is 183°C. At this temperature and composition, the alloy changes directly from liquid to a mechanical mixture of two solid crystals (lead solid solution and tin solid solution), and a eutectic reaction occurs. C is the melting point of pure tin, which is 232°C, which is the same as A. The point is similar to the transition temperature between the solid and liquid states of pure tin. Above this temperature, tin is liquid, and below this temperature, it is solid. D is the maximum amount of tin that can be dissolved in lead at 183°C (eutectic temperature). When the temperature is lower than 183°C, as the temperature drops, the solid solubility of tin in lead will change along the solvus line, and excess tin will precipitate from the lead-based solid solution in the form of tin-based solid solution. E is the maximum amount of lead that can be dissolved in tin at 183°C (eutectic temperature). When the temperature is lower than 183°C, As the temperature drops, the solid solubility of lead in tin will change along the solvus line, and there will be excess lead precipitated from the tin-based solid solution in the form of lead-based solid solution. A is the melting point of lead, B is the melting point of lead-tin alloy, C is the melting point of tin, and DE is the solubility limit of the solid solution. From the lead-tin equilibrium diagram, it can be seen that the lead-tin alloy made with a ratio of 65% lead and 35% tin is in a semi-solid state within the temperature range of 180~250℃. Such a lead-tin alloy has a relatively wide operating temperature range. According to the experience in engineering, if the lead content is too little, it is not suitable for processing and forming when sealing the lead; if the tin content is too much, the temperature range of the solder in the semi-solid state is reduced, and the processing time is too short, which is not conducive to the lead sealing operation.

[0099] Step 207: Use the pre-treated lead-tin alloy to lead-line the lead sealing part of the welding joint between the deep well guide cable and the feed rod according to the preset lead-line requirements.

[0100] Furthermore, the preset lead plating requirement is specifically that the lead plating be performed at least twice.

[0101] In the embodiment of the present invention, the lead sealing part of the welding joint between the deep well guide cable and the feed rod is lead-plated at least twice using the pre-treated lead-tin alloy according to the preset lead-plating requirements.

[0102] There may be some tiny gaps or holes in the welding head 3. If these gaps are not effectively treated, moisture, air or other impurities may enter, affecting the performance and service life of the welding head 3. During the lead enamelling process, the lead-tin alloy has good fluidity and can penetrate into these tiny gaps. Manually applying twice can further ensure that the gaps are fully filled, forming a tighter sealing layer, and effectively preventing the intrusion of foreign substances.

[0103] Lead-tin alloy has a certain conductivity, and after lead plating, a protective layer with good conductivity can be formed on the surface of the welding head 3. Manually applying twice can make the lead layer fit better with the surface of the welding head 3 and reduce the contact resistance.

[0104] The lead enamel layer can provide additional mechanical protection for the welding head 3, making it more durable. Manually applying twice can increase the thickness of the lead layer and improve the impact resistance and wear resistance of the welding head 3.

[0105] Step 208: Set the lead sealing mold 7 on the lead sealing position of the welding joint between the deep well guide cable and the feed rod, and perform the lead sealing operation.

[0106] Further, step 208 may include the following sub-steps:

[0107] S21, subjecting the lead raw material to a graded and progressive heating treatment to obtain molten lead.

[0108] S22, pouring molten lead into the mold, and dismantling the lead sealing mold 7 after the molten lead is cooled and solidified.

[0109] In the embodiment of the present invention, please refer to Figure 6-Figure 7 , Figure 6 The process comprises a lead-lined wrapping layer 5 and a mold lead sealing layer 6. After the lead sealing mold 7 is sleeved on the lead sealing part of the welding joint of the deep well guide cable and the feeder rod, the lead raw material is subjected to graded and progressive heating treatment to obtain molten lead water, which is then poured into the mold. The lead water is rapidly cooled and solidified in the lead sealing mold 7 to form the mold lead sealing layer 6. The lead sealing mold 7 is disassembled to complete the lead sealing operation.

[0110] The lead-enameling method is combined with the mold-sealing method. The first layer of lead-enameling wrapping layer 5 is convenient for controlling the lead sealing temperature. The lead-tin alloy is manually applied to prevent heat from damaging the cable insulation layer. The second layer is the mold-sealing layer 6, which is convenient for controlling the thickness of the lead sealing layer in all directions, that is, for controlling the external dimensions of the lead sealing layer.

[0111] In the present invention, in response to a lead sealing operation request, the lead sealing part of the welding joint between the deep well guide cable and the feed rod corresponding to the lead sealing operation request is determined; the structural parameters associated with the lead sealing part of the welding joint between the deep well guide cable and the feed rod are obtained, and a lead sealing mold 7 is constructed using the structural parameters; a lead-tin alloy is prepared and pretreated; the lead sealing part of the welding joint between the deep well guide cable and the feed rod is lead-enameled using the pretreated lead-tin alloy according to preset lead-enameling requirements; the lead sealing mold 7 is mounted on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and a lead sealing operation is performed.

[0112] The present invention proposes a composite lead sealing method for the welding joint of a deep well guide cable and a feeder rod, which is applied to a deep well test grounding electrode project. The composite lead sealing operation is carried out by coordinating the lead enameling method with the mold lead sealing method. First, an adaptive lead sealing mold 7 is constructed according to the irregular structural characteristics of the welding joint of the deep well guide cable and the feeder rod, which is a key prerequisite for ensuring that subsequent lead sealing operations can be carried out accurately and efficiently. Then, the lead enameling method is used to lead the welding joint of the deep well guide cable and the feeder rod, thereby forming a layer of lead enameling wrapping layer 5 on the surface of the welding joint 3, which not only helps to achieve precise control of the lead sealing temperature, but also can effectively prevent the cable insulation layer from being damaged due to heat transfer during the lead sealing process, thereby ensuring the insulation performance and overall safety of the cable. Finally, the constructed lead sealing mold 7 is used to perform the lead sealing operation on the irregular structure at the welding joint 3. Through the standardized guidance of the mold, it can be ensured that the lead-tin alloy is evenly distributed in all directions of the welding joint 3, thereby keeping the lead sealing thickness consistent, and finally achieving a good sealing effect, meeting the high quality requirements of the deep well test grounding electrode project for the sealing of the welding joint 3.

[0113] The following is a specific test example:

[0114] 1) Prepare the lead-tin alloy

[0115] 2) Heat the prepared lead-tin alloy to 180~250℃ to make it semi-solid.

[0116] 3) Lead the welding joints between the guide cable and the feed rod, and apply lead manually twice.

[0117] 4) Due to the irregular shape of the welding joint between the guide cable and the feeder rod of the deep well grounding electrode, the lead sealing mold was designed using 3D modeling software. The distance from the outer edge of the mold cavity to the welding joint 3 in all directions was consistent, which was 10 mm.

[0118] The mold cavity can well wrap the irregularly shaped welding head 3. This lead sealing mold is used for the lead sealing of the welding head of the guide cable and the feeder rod of the deep well grounding electrode.

[0119] 5) Import the designed seal mold 3D processing data into the CNC machine tool, select high-density carbon graphite blocks, and precisely carve the seal mold.

[0120] 6) Use the processed mold to seal the lead, ensuring that the lead seal thickness in all directions of the welding head 3 is 10 mm to achieve a good sealing effect.

[0121] In the above lead sealing process, the temperature at different points is measured and recorded by thermocouples:

[0122] Purpose of measurement

[0123] This test measures the temperature variation of the circumferential surface of the cable insulation layer over time during the lead sealing process to determine whether the temperature during the lead sealing process has a damaging effect on the insulation.

[0124] Measuring equipment

[0125] Iron-copper-nickel thermocouple, digital multimeter with 1% sensitivity, infrared thermometer.

[0126] Test Procedure

[0127] In order to observe the temperature distribution under the water-blocking layer (close to the surface of the insulating shielding layer) at the same level, four thermocouples a, b, c, and d are evenly and symmetrically laid on the surface of the cable insulation layer in advance. The thermocouple laying position is located just below the lead sealing position. Then, the primer and lead sealing are carried out. The laying position of the thermocouple at the insulation is measured. Figure 8 shown.

[0128] Temperature Recording

[0129] Record the change of thermocouple temperature over time during lead sealing. Record the value of the multimeter every 1 minute during the lead sealing process. The temperature change curve of each point is as follows: Figure 9-12 As shown:

[0130] Table 1. Maximum temperature of thermocouple measurement points

[0131]

[0132] Although the flame temperature of the spray gun is as high as 1600℃ and the temperature of the newly melted lead strip is as high as 200℃, the maximum temperature of the outer surface of the cable insulation layer is only 78℃, which is not as high as we imagined. This temperature is much lower than the temperature of the insulation in the vulcanization tube when the cable is produced. Therefore, under normal lead sealing conditions, there is no problem of burning the insulation.

[0133] When the lead pouring operation is adopted, when the semi-solid lead melted on the wiper cloth adheres to the aluminum sheath, the highest temperature of the lead at that time measured by an infrared thermometer is 88°C, which is much lower than the imagined melting point of lead, and the temperature drops very rapidly.

[0134] The change of temperature over time is not linear, and the temperature of the four measurement points is not the same at the same time. This is mainly due to the time difference between the two lead pourings, the position of the lead pouring is not at one point, but on an irregular annular surface, and the amount of lead poured each time is also different.

[0135] Therefore, during the actual lead sealing, the temperature is measured and recorded at different points by thermocouples, and the temperature is much lower than the temperature of the insulation in the vulcanized tube during cable production. Under normal lead sealing conditions, there is no problem of insulation burning.

[0136] See also Fig.13 , Fig.13 This is a structural block diagram of a composite lead sealing system for a deep well current guiding cable and a feeder rod welding joint provided in the third embodiment of the present invention.

[0137] The present invention provides a composite lead sealing system for a deep well current guiding cable and a feeder rod welding joint, comprising:

[0138] The response module 301 is used to respond to the lead sealing operation request and construct the lead sealing mold 7;

[0139] A pretreatment module 302 is used to prepare the lead-tin alloy and perform pretreatment;

[0140] The lead-plating module 303 is used to lead-plating the lead sealing part of the welding joint between the deep-well guide cable and the feed rod using the pre-treated lead-tin alloy according to the preset lead-plating requirements;

[0141] The lead sealing module 304 is used to sleeve the lead sealing mold 7 on the lead sealing position of the welding joint between the deep well guide cable and the feed rod, and perform the lead sealing operation.

[0142] Furthermore, the mold construction module 301 includes:

[0143] The lead sealing position determination submodule is used to respond to the lead sealing operation request and determine the lead sealing position of the deep well guide cable and the feed rod welding joint corresponding to the lead sealing operation request;

[0144] The structural parameter submodule is used to obtain the structural parameters associated with the lead sealing part of the deep well guide cable and the feed rod welding joint;

[0145] A 3D modeling submodule is used to create a target mold model using structural parameters based on 3D modeling software;

[0146] The format conversion submodule is used to export the target mold model to a format file that meets the machine tool recognition requirements;

[0147] The mold processing submodule is used to read the format file through the machine tool, and perform mold processing according to the preset processing requirements to generate the lead sealing mold 7.

[0148] Furthermore, the 3D modeling submodule includes:

[0149] The mold main body model unit is used to call the stretching tool to create the mold main body model;

[0150] The geometric model unit is used to create the geometric model of each component included in the lead sealing part of the deep well guide cable and the feed rod welding joint according to the structural parameters;

[0151] A composite geometric body model unit is used to perform a sum operation on the geometric body models of each component to generate a composite geometric body model;

[0152] The initial mold model unit is used to perform a difference operation on the composite geometric body model based on the mold main body model to obtain an initial mold model with a lead-sealed composite cavity;

[0153] The target mold model unit is used to create a lead filling port geometry model of the initial mold model, and based on the initial mold model, perform a difference operation on the lead filling port geometry model to obtain a target mold model with a lead filling port 8.

[0154] Furthermore, the preset processing requirement is specifically to process into a symmetrical and detachable lead sealing mold 7, and the lead sealing thickness in any direction of the surface of the welding head 3 after the lead sealing operation is performed using the lead sealing mold 7 is 10 mm.

[0155] Furthermore, the material of the lead sealing mold 7 is carbon graphite.

[0156] Furthermore, the mass ratio of lead to tin in the lead-tin alloy is (6~7):(3~4).

[0157] Furthermore, the preprocessing module 302 includes:

[0158] The heating submodule is used to heat the lead-tin alloy at a temperature of 180-250°C until the lead-tin alloy is in a semi-molten state.

[0159] Furthermore, the preset lead plating requirement is specifically that the lead plating be performed at least twice.

[0160] Further, the lead sealing module 304 includes:

[0161] The lead water melting submodule is used to perform a graded and progressive heating treatment on the lead raw material to obtain melted lead water;

[0162] The lead filling submodule is used to fill molten lead into the mold, and then disassemble the lead sealing mold 7 after the molten lead is cooled and solidified.

[0163] In the present invention, in response to a lead sealing operation request, the lead sealing part of the welding joint between the deep well guide cable and the feed rod corresponding to the lead sealing operation request is determined; the structural parameters associated with the lead sealing part of the welding joint between the deep well guide cable and the feed rod are obtained, and a lead sealing mold 7 is constructed using the structural parameters; a lead-tin alloy is prepared and pretreated; the lead sealing part of the welding joint between the deep well guide cable and the feed rod is lead-enameled using the pretreated lead-tin alloy according to preset lead-enameling requirements; the lead sealing mold 7 is mounted on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and a lead sealing operation is performed.

[0164] The present invention proposes a composite lead sealing system for the welding joint of a deep well guide cable and a feeder rod, which is applied to a deep well test grounding electrode project. The composite lead sealing operation is carried out by coordinating the lead enameling method with the mold lead sealing method. First, an adaptive lead sealing mold 7 is constructed according to the irregular structural characteristics of the welding joint of the deep well guide cable and the feeder rod, which is a key prerequisite for ensuring that subsequent lead sealing operations can be carried out accurately and efficiently. Then, the lead enameling method is used to lead the welding joint of the deep well guide cable and the feeder rod, thereby forming a layer of lead enameling wrapping layer 5 on the surface of the welding joint 3, which not only helps to achieve precise control of the lead sealing temperature, but also can effectively prevent the cable insulation layer from being damaged due to heat transfer during the lead sealing process, thereby ensuring the insulation performance and overall safety of the cable. Finally, the constructed lead sealing mold 7 is used to perform the lead sealing operation on the irregular structure at the welding joint 3. Through the standardized guidance of the mold, it can be ensured that the lead-tin alloy is evenly distributed in all directions of the welding joint 3, thereby keeping the lead sealing thickness consistent, and finally achieving a good sealing effect, meeting the high quality requirements of the deep well test grounding electrode project for the sealing of the welding joint 3.

[0165] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0166] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0167] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 composite lead sealing method for the welding joint of a deep well guide cable and a feeder rod, characterized in that: include: Respond to lead sealing job requests and build lead sealing molds; Preparing lead-tin alloy and pre-treating it; According to the preset lead-plating requirements, the lead-tin alloy after pretreatment is used to lead-plating the lead sealing part of the welding joint between the deep well guide cable and the feeder rod; The lead sealing mold is sleeved on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and the lead sealing operation is performed.

2. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to claim 1 is characterized in that: The step of responding to the lead sealing operation request and constructing the lead sealing mold includes: In response to a lead sealing operation request, determine a lead sealing position of a welding joint between a deep well flow guiding cable and a feed rod corresponding to the lead sealing operation request; Acquire structural parameters associated with the lead sealing portion of the deep well current guiding cable and the feed rod welding joint; Based on the three-dimensional modeling software, the target mold model is created using the structural parameters; Exporting the target mold model to a format file that meets the machine tool recognition requirements; The format file is read by a machine tool, and the mold is processed according to preset processing requirements to generate a lead sealing mold.

3. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to claim 2 is characterized in that: The method of creating a target mold model using the structural parameters based on the three-dimensional modeling software includes: Use the stretching tool to create the mold body model; According to the structural parameters, a geometric model of each component included in the lead sealing part of the welding joint between the deep well guide cable and the feed rod is created; Performing a summation operation on the geometric body models of each component to generate a composite geometric body model; Based on the mold main body model, performing a difference operation on the composite geometric body model to obtain an initial mold model with a lead-sealed composite cavity; A lead pouring port geometry model of the initial mold model is created, and based on the initial mold model, a subtraction operation is performed on the lead pouring port geometry model to obtain a target mold model with a lead pouring port.

4. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to claim 3 is characterized in that: The preset processing requirement is specifically to process it into a symmetrical and detachable lead sealing mold, and the lead sealing thickness in any direction of the welding head surface after the lead sealing operation is performed using the lead sealing mold is 10 mm.

5. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to any one of claims 1 or 2, characterized in that: The material of the lead sealing mold is carbon graphite.

6. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to claim 1 is characterized in that: The mass ratio of lead to tin in the lead-tin alloy is (6-7): (3-4).

7. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to claim 1 is characterized in that: The preprocessing comprises: The lead-tin alloy is heated at a temperature of 180-250° C. until the lead-tin alloy is in a semi-molten state.

8. The composite lead sealing method for the welding joint of the deep well guide cable and the feeder rod according to claim 1 is characterized in that: The preset lead plating requirement is specifically that the lead plating is performed at least twice.

9. The composite lead sealing method for the welding joint of the deep well guide cable and the feed rod according to claim 1 is characterized in that: The lead sealing operation includes: The lead raw material is subjected to a stepwise heating treatment to obtain molten lead water; Pour the molten lead into the mold, and disassemble the lead sealing mold after the molten lead is cooled and solidified.

10. A composite lead sealing system for the welding joint of a deep well guide cable and a feeder rod, characterized in that: include: The response module is used to respond to the lead sealing operation request and build the lead sealing mold; A pretreatment module, used for preparing and pretreating the lead-tin alloy; A lead-plating module is used to lead-plating the lead sealing part of the welding joint between the deep-well guide cable and the feeder rod using the pre-treated lead-tin alloy according to the preset lead-plating requirements; The lead sealing module is used to sleeve the lead sealing mold on the lead sealing part of the welding joint between the deep well guide cable and the feed rod, and perform the lead sealing operation.

Images