Conductive rod fixing device and double-end numerical control lathe

Abstract

The utility model discloses a kind of electrically conductive rod fixing device and double-end numerical control lathe, it is related to machining equipment technical field.Electrically conductive rod fixing device includes jacket, jacket is made of two section is semicircular arc's fixture, two fixtures are used for placing the electrically conductive rod of clamping to be processed between;Two fixtures are mutually close and are equipped with the inside wall of avoiding sink groove;After being worn in the chuck of double-end numerical control lathe in jacket, the jacket is clamped and fixed using chuck;Electrically conductive rod fixing device provided by the utility model, by setting jacket, electrically conductive rod is pre-clamped, then it is placed into chuck, so as to be installed on double-end numerical control lathe, so that the two surfaces to be processed of electrically conductive rod are all in the processing range of double-end numerical control lathe, so that sequentially clamping and fixing, the processing of multiple surfaces to be processed of electrically conductive rod can be realized, the machining precision of electrically conductive rod can be effectively ensured, and processing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing equipment technology, and in particular to a conductive rod fixing device and a double-head CNC lathe. Background Technology

[0002] Currently, in actual machining scenarios for conductive rods, when using conventional CNC lathes to machine the surface, the entire machining process needs to be broken down into two sequential steps. This step-by-step machining mode has significant drawbacks. Due to the dispersed nature of the steps, the adjustment and waiting time between the two machining operations increases, resulting in extremely low overall machining efficiency. Moreover, during the clamping and machining process, accurately controlling the coaxiality of the product faces great difficulties. Even if operators strictly follow the specifications, it is difficult to guarantee that the coaxiality of the product will reach the ideal standard after each clamping.

[0003] Furthermore, during processing, when products need to be moved for repositioning or process changes, the surface to be processed is highly susceptible to collisions with surrounding equipment and fixtures. These collisions can range from minor scratches affecting the product's appearance to serious alterations in shape and size, directly causing product defects and resulting in high defect rates and significant cost losses for the company.

[0004] The situation becomes even more complex when machining tapered conductive rods. In this case, soft-jaw clamping is typically used to secure the conductive rod. However, this technique has several drawbacks. Compared to machining ordinary conductive rods, using soft-jaw clamping for tapered conductive rods is less efficient. This is because the elasticity of the soft jaws requires more precise adjustments and a longer stabilization time during clamping, resulting in a reduced machining output per unit time. Furthermore, due to the unique shape of the tapered conductive rod, the soft jaws struggle to distribute force evenly during clamping, further complicating the process of ensuring product coaxiality. This makes reliable coaxiality even more difficult to guarantee, severely impacting the machining quality and production efficiency of the conductive rod. Utility Model Content

[0005] In view of this, the purpose of this utility model is to overcome the shortcomings in related technologies. This utility model provides a conductive rod fixing device and a double-head CNC lathe.

[0006] This utility model provides the following technical solution: A conductive rod fixing device includes a clamp.

[0007] The clamp consists of two clamps with a semi-circular cross-section, and the conductive rod to be processed is placed between the two clamps; the inner sidewalls of the two clamps that are close to each other are provided with clearance grooves; after the clamp is inserted into the collet of the double-head CNC lathe, the clamp can be used to clamp and fix the clamp.

[0008] As a further improvement to the above technical solution, one end of the jacket is provided with a positioning step.

[0009] As a further improvement to the above technical solution, the two fixtures are connected by locating pins.

[0010] As a further improvement to the above technical solution, the positioning pins are sequentially inserted through the positioning steps on the two clamps.

[0011] As a further improvement to the above technical solution, the positioning step is provided with an installation notch corresponding to the positioning pin. The positioning pin is inserted through the installation notch on one of the positioning steps and is threaded into the other positioning step.

[0012] As a further improvement to the above technical solution, two positioning pins are provided symmetrically with respect to the axis of the sleeve.

[0013] As a further improvement to the above technical solution, the depth of the avoidance trough is d, and the value of d satisfies: 1mm≤d≤5mm.

[0014] As a further improvement to the above technical solution, the opening length of the avoidance trough along the axial direction of the jacket is L1, and the total length of the jacket is L2. The values ​​of L1 and L2 satisfy: 0.5×L2≤L1≤0.8×L2.

[0015] As a further improvement to the above technical solution, the jacket is made of P20 mold steel.

[0016] This utility model also provides a double-head CNC lathe, including any of the above-mentioned conductive rod fixing devices.

[0017] Compared with related technologies, the beneficial effects of this utility model are: The conductive rod fixing device provided by this utility model, when it is necessary to install the conductive rod to be processed on a double-head CNC lathe for processing, firstly, the conductive rod to be processed is placed between the two clamps provided by the clamp. At this time, the two clamps will perform their initial clamping and positioning functions, supporting and fixing the conductive rod from both sides, ensuring that the conductive rod maintains the correct position and posture in the initial state.

[0018] Next, the sleeve, with the conductive rod already pre-fixed, is inserted into the collet. During this process, the collet, with its design and clamping force, clamps and secures the sleeve. Through this operation, the conductive rod to be processed is clamped and fixed on the double-headed CNC lathe. This ensures that both surfaces of the conductive rod to be processed are simultaneously within the machining range of the double-headed CNC lathe. This means that the operator only needs to perform sequential clamping and fixing operations to achieve one-time fixation of the conductive rod, and then process multiple surfaces simultaneously. This design greatly simplifies the operation process, avoiding the cumbersome process of repeatedly moving and clamping the conductive rod. Multiple clamping and moving not only increases the operation time and difficulty, but also easily causes bumps and scratches to the surfaces of the conductive rod to be processed during the movement, thus affecting the processing quality. The conductive rod fixing device of this utility model effectively avoids this problem, ensuring the integrity and accuracy of the conductive rod during the processing, and significantly improving processing efficiency.

[0019] Furthermore, by providing clearance grooves on the inner sidewalls of the opposing end faces of the two clamps, this design effectively avoids the unmachined surfaces of the conductive rod. These unmachined surfaces often have low-precision roughness or special structures, which do not require much attention or processing during machining. The clearance grooves allow the clamps to cleverly bypass these unmachined surfaces when holding the conductive rod, avoiding unnecessary contact and impact. This allows for greater focus on machining, improving the machining accuracy of the two surfaces of the conductive rod and ensuring that the final manufactured conductive rod meets standards and requirements.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the conductive rod fixing device from one perspective in one embodiment of the present invention; Figure 2 This shows a schematic diagram of the conductive rod fixing device from another perspective in one embodiment of the present invention; Figure 3 This diagram shows a schematic view of the fixture in one embodiment of the present invention. Figure 4 This diagram shows another perspective view of the fixture in one embodiment of the present invention.

[0023] Explanation of key component symbols: 100-Clamping sleeve; 110-Clamping fixture; 111-Allowing trough; 120-Positioning step; 121-Installation notch; 130-Positioning pin; 200-Collapse clamp; 300-Conductive rod; 310-Surface to be machined. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] Combination Figures 1 to 3 As shown, an embodiment of this utility model provides a conductive rod fixing device, including a clip 100.

[0030] The clamp 100 is composed of two clamps 110 with a semi-circular cross section. The space between the two clamps 110 is used to hold the conductive rod 300 to be processed. The inner sidewalls of the two clamps 110 that are close to each other are provided with clearance grooves 111. After the clamp 100 is inserted into the collet 200 of the double-head CNC lathe, the collet 200 can be used to clamp and fix the clamp 100.

[0031] The conductive rod fixing device provided in this embodiment, when the conductive rod 300 to be processed needs to be mounted on a double-head CNC lathe for processing, firstly, places the conductive rod 300 to be processed between the two clamps 110 provided by the clamp 100. At this time, the two clamps 110 will perform their initial clamping and positioning functions, supporting and fixing the conductive rod 300 from both sides, ensuring that the conductive rod 300 maintains the correct position and posture in the initial state.

[0032] Next, the collet 100, with the conductive rod 300 already preliminarily fixed, is inserted into the collet 200. During this process, the collet 200, with its design and clamping force, clamps and secures the collet 100. Through this operation, the conductive rod 300 to be processed is clamped and fixed on the double-head CNC lathe. This ensures that both machined surfaces 310 of the conductive rod 300 are simultaneously within the machining range of the double-head CNC lathe. This means that the operator only needs to perform sequential clamping and fixing operations to achieve one-time fixation of the conductive rod 300, and then process multiple machined surfaces 310. This design greatly simplifies the operation process and avoids the cumbersome process of repeatedly moving and clamping the conductive rod 300. Multiple movements and clamping not only increase the operation time and difficulty, but also easily cause bumps and scratches to the machined surfaces 310 of the conductive rod 300 during movement, thus affecting the machining quality. The conductive rod fixing device provided in this embodiment effectively avoids this problem, ensuring the integrity and accuracy of the conductive rod 300 during the processing, and significantly improving processing efficiency.

[0033] Furthermore, by providing clearance grooves on the inner sidewalls of the opposing end faces of the two clamps 110, this design effectively avoids the unmachined surfaces of the conductive rod 300. The unmachined surfaces of the conductive rod 300 often have rough surfaces with low precision or special structures, which do not require much attention or processing during machining. The clearance grooves allow the clamps 110 to cleverly bypass these unmachined surfaces when holding the conductive rod 300, avoiding unnecessary contact and impact. This allows for greater focus on machining, improving the machining accuracy of the two machined surfaces 310 of the conductive rod 300, and ensuring that the final machined conductive rod 300 meets standards and requirements.

[0034] In some specific embodiments, one end of the sleeve 100 is provided with a positioning step 120; when the operator inserts the sleeve 100 into the collet 200, the positioning step 120 begins to function. As the sleeve 100 is inserted deeper, the positioning step 120 will lock onto the side of the collet 200, forming a clear physical barrier. This barrier effectively limits the further insertion of the sleeve 100, avoiding installation position deviations caused by excessive or insufficient insertion.

[0035] The precise positioning of the positioning step 120 ensures an extremely high level of accuracy in the relative positions of the sleeve 100 and the collet 200. This precision means that operators do not need to perform tedious repeated adjustments during installation. Without the positioning step 120, operators might need to make multiple attempts and adjustments to ensure the accurate relative positions of the sleeve 100 and the collet 200, which is not only time-consuming and labor-intensive but also prone to installation errors due to human factors.

[0036] With the assistance of the positioning step 120, the clamp 100 can be accurately installed into the designated position in one go, greatly improving the efficiency of the clamp 100. Simultaneously, because the relative position of the clamp 100 and the collet 200 is precisely guaranteed, the stability of the conductive rod 300 during the fixing process is also significantly improved, thereby increasing the processing efficiency of the conductive rod 300. Operators can focus more on the processing of the conductive rod 300 without worrying about reduced processing quality or efficiency due to installation problems.

[0037] In some specific embodiments, the two clamps 110 are assembled and connected by a locating pin 130. In actual operation, after the initial clamping action of the conductive rod 300 to be processed is completed by the clamping sleeve 100, the conductive rod 300 is clamped between the two clamps 110, but it has not yet reached an absolutely stable state. In order to further enhance the stability of clamping and reduce potential problems in subsequent operations, it is necessary to use the locating pin 130 or other suitable connecting parts to clamp and fix the two clamps 110.

[0038] When using the locating pin 130 for connection and fixation, the operator will tighten the locating pin 130 according to the predetermined force, so that the two clamps 110 fit tightly together. This connection method has a certain degree of stability. Once the two clamps 110 are fixed by the locating pin 130, they will form a whole and generate a uniform clamping force on the conductive rod 300.

[0039] The advantages of this approach are significant. During the subsequent transfer or insertion of the sleeve 100 into the collet 200, since the two clamps 110 are securely connected by the locating pin 130, the probability of relative movement between the conductive rod 300 and the sleeve 100 is greatly reduced. Previously, without the locating pin 130 connecting the two clamps 110, the conductive rod 300 might experience slight movement within the sleeve 100 during transfer or insertion due to external forces or its own weight. Although this movement may seem insignificant, it can severely affect the clamping and fixing accuracy of the conductive rod 300, thus adversely impacting the subsequent processing quality.

[0040] The design of assembling and connecting the two clamps 110 and the positioning pins 130 in this embodiment can effectively avoid this situation and ensure that the conductive rod 300 is always kept in the accurate position throughout the entire operation, thereby ensuring the accuracy of clamping and fixing the conductive rod 300 in this embodiment.

[0041] In some specific embodiments, the positioning pin 130 passes sequentially through the positioning steps 120 on the two clamps 110. Since the positioning pin 130 is located at the side end of the sleeve 100, during the subsequent operation of inserting the sleeve 100 into the collet 200, the positioning pin 130 will not enter the collet 200 along with the sleeve 100. If the positioning pin 130 enters the collet 200 along with the sleeve 100, on the one hand, it may occupy unnecessary space inside the collet 200, interfering with the normal clamping action of the collet 200 on the sleeve 100, resulting in uneven distribution of clamping force and affecting the fixing effect of the sleeve 100; on the other hand, the positioning pin 130 may also collide or rub against the inner wall of the collet 200 or other components inside the collet 200, causing damage to the positioning pin 130 or the collet 200 and reducing the service life of the device.

[0042] In some specific embodiments, the positioning step 120 is provided with an installation notch 121 corresponding to the positioning pin 130. The positioning pin 130 passes through the installation notch 121 on one of the positioning steps 120 and is threaded into the other positioning step 120. This is to ensure that the end of the positioning pin 130 does not extend beyond the side of the positioning step 120 during use, thereby reducing the probability of interference between the clamp 100 and other external components during movement and ensuring the reliability of this embodiment.

[0043] In some specific embodiments, two positioning pins 130 are provided symmetrically with respect to the axis of the clamp 100 to ensure the reliable connection between the two clamps 110.

[0044] like Figure 4 As shown, in some specific embodiments, the depth of the avoidance groove 111 is d, and the value of d satisfies: 1mm ≤ d ≤ 5mm. When the depth d of the avoidance groove 111 is in the range of 1mm to 5mm, it can effectively avoid these rough surfaces or special structures on the side wall of the conductive rod 300. In this way, when the clamp 110 clamps the conductive rod 300, it will not cause unnecessary interference due to excessive contact with these non-critical parts, avoiding the clamping instability caused by forcibly clamping rough surfaces or special structures, thereby providing a relatively stable and undisturbed environment for the processing of the conductive rod 300.

[0045] Meanwhile, limiting the value of d to this range is also to ensure the structural strength of the clamp 110 itself. If the depth of the clearance groove 111 is too small, such as less than 1 mm, it may not be able to adequately avoid the rough surfaces or special structures on the side wall of the conductive rod 300, causing the clamp 110 to still be affected by these parts during the clamping process, reducing the reliability of the clamping. On the other hand, if the depth of the clearance groove 111 is too large, exceeding 5 mm, it will excessively weaken the structural strength of the clamp 110. When the clamp 110 is subjected to clamping force, it may experience stress concentration, deformation, or even breakage due to the excessive depth of the clearance groove 111, seriously affecting the service life of the clamp 110 and the clamping effect on the conductive rod 300.

[0046] Therefore, by controlling the depth d of the avoidance groove 111 within a reasonable range of 1mm to 5mm, it is possible to ensure that the avoidance groove 111 effectively plays its avoidance role, and also to ensure that the clamp 110 itself has sufficient structural strength, thereby ensuring the reliability of the clamp 110 in clamping the conductive rod 300, and providing a strong guarantee for the high-quality processing of the conductive rod 300.

[0047] In some specific embodiments, the opening length of the clearance groove 111 along the axial direction of the clamp 100 is L1, and the total length of the clamp 100 is L2. The values ​​of L1 and L2 satisfy: 0.5×L2≤L1≤0.8×L2. In practical applications, when the opening length of the clearance groove 111 is designed according to the above value range, several good effects can be achieved. First, from the perspective of clearance function, if the opening length L1 of the clearance groove 111 along the axial direction of the clamp 100 is too small, for example, much smaller than 0.5×L2, it may not be able to fully cover the rough surfaces or special structures on the side wall of the conductive rod 300 that need to be avoided. In this case, during the clamping process of the conductive rod 300, the clamp 110 may interfere with these parts that should not be in contact, which will not only affect the processing accuracy of the conductive rod 300, but may also damage the surface of the conductive rod 300. When the value of L1 is in the range of 0.5×L2 to 0.8×L2, the avoidance groove 111 can effectively avoid the corresponding part on the side wall of the conductive rod 300, providing a relatively "clean" and undisturbed space for the processing of the conductive rod 300, thereby giving full play to its avoidance function.

[0048] Secondly, from the perspective of clamping reliability, if the opening length L1 of the clearance groove 111 is too large, such as close to or exceeding 0.8 × L2, then the portion of the clamping sleeve 100 used for actual contact and clamping with the conductive rod 300 will be correspondingly reduced. The effective clamping contact surface that can be formed between the two clamps 110 and the conductive rod 300 will become insufficient, leading to uneven distribution of the clamping force of the clamping sleeve 100 on the conductive rod 300 and decreased clamping stability. During processing, the conductive rod 300 may wobble or shift due to insecure clamping, seriously affecting processing quality and efficiency. However, when L1 satisfies 0.5 × L2 ≤ L1 ≤ 0.8 × L2, sufficient clamping contact surface can be maintained between the two clamps 110 and the conductive rod 300, ensuring that the clamping sleeve 100 applies a uniform and stable clamping force to the conductive rod 300, thereby guaranteeing the clamping reliability of the clamping sleeve 100 on the conductive rod 300 and laying a solid foundation for high-quality processing of the conductive rod 300.

[0049] In some specific embodiments, the jacket 100 is made of P20 mold steel; P20 mold steel is a high-performance alloy tool steel with a series of outstanding properties. Chemically, it contains appropriate amounts of elements such as carbon, chromium, nickel, and molybdenum, which work synergistically to give P20 mold steel excellent comprehensive performance. In terms of mechanical properties, P20 mold steel exhibits high strength, high hardness, and good toughness. Its hardness is typically between HRC 28 and 32, and after appropriate heat treatment, the hardness can be further increased while maintaining good toughness and resistance to brittle fracture.

[0050] The selection of P20 mold steel for the jacket 100 serves a specific purpose. The conductive rod 300, due to its function and usage requirements, possesses a certain level of mechanical strength. However, during processing, it needs to withstand various external forces, such as the clamping force of the fixture 110 and the cutting force of the machining tool. If the mechanical strength of the jacket 100 is insufficient, it may deform, wear, or even be damaged during its interaction with the conductive rod 300. This will not only affect the machining accuracy of the conductive rod 300, leading to dimensional deviations and reduced surface quality, but will also shorten the service life of the jacket 100, increasing equipment maintenance costs and replacement frequency.

[0051] The clamping sleeve 100, made of P20 mold steel, has a mechanical strength greater than that of the conductive rod 300 to be processed. This means that when clamping the conductive rod 300 for processing, the clamping sleeve 100 can stably withstand various external forces without easily deforming or being damaged. It provides a reliable and stable support and fixing environment for the conductive rod 300, ensuring that the conductive rod 300 maintains the correct position and posture during processing, thereby guaranteeing processing accuracy and quality. At the same time, due to the high mechanical strength of the clamping sleeve 100, its service life is also effectively extended, reducing equipment downtime and maintenance costs caused by damage to the clamping sleeve 100. This ensures the reliability and service life of this embodiment, providing a strong guarantee for the efficient and high-quality processing of the conductive rod 300.

[0052] An embodiment of this utility model also provides a double-head CNC lathe, which is equipped with two sets of independent cutting tool structures to realize the machining of two different surfaces 310 of the conductive rod 300. It includes the conductive rod fixing device described in the above embodiment. The double-head CNC lathe has all the beneficial effects of the conductive rod fixing device, which will not be described in detail here.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An electrically conductive pole securing device, characterized in that, include: The jacket (100) consists of two clamps (110) with a semi-circular cross section. The space between the two clamps (110) is used to hold the conductive rod (300) to be processed. The inner sidewalls of the two clamps (110) that are close to each other are provided with clearance grooves (111). After the sleeve (100) is inserted into the collet (200) of the double-head CNC lathe, the sleeve (100) can be clamped and fixed by the collet (200).

2. The electrically conductive pole securing device of claim 1, wherein, One end of the jacket (100) is provided with a positioning step (120).

3. The conductive rod fixing device according to claim 2, characterized in that, The two fixtures (110) are assembled and connected by a locating pin (130).

4. The electrically conductive pole securing device of claim 3, wherein, The positioning pin (130) passes through the positioning steps (120) on the two clamps (110) in sequence.

5. The electrically conductive pole securing device of claim 4, wherein, The positioning step (120) is provided with an installation notch (121) corresponding to the positioning pin (130). The positioning pin (130) is inserted through the installation notch (121) on one of the positioning steps (120) and is inserted into the other positioning step (120) by means of threaded engagement.

6. The conductive rod fixing device according to claim 4, characterized in that, Two positioning pins (130) are provided symmetrically with respect to the axis of the sleeve (100).

7. The conductive rod fixing device according to any one of claims 1 to 6, characterized in that, The depth of the avoidance trough (111) is d, and the value of d satisfies: 1mm≤d≤5mm.

8. The conductive rod fixing device according to any one of claims 1 to 6, characterized in that, The length of the clearance trough (111) along the axis of the sleeve (100) is L1, and the total length of the sleeve (100) is L2. The values ​​of L1 and L2 satisfy: 0.5×L2≤L1≤0.8×L2.

9. The electrically conductive pole securing arrangement of any one of claims 1 to 6, wherein, The jacket (100) is made of P20 mold steel.

10. A double-head numerically controlled lathe, characterized by comprising: Includes the conductive rod fixing device as described in any one of claims 1 to 9.

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