Drill rod thread cold rolling equipment applied to anchoring drilling tool with large length-diameter ratio

Abstract

The invention discloses drill rod thread cold rolling equipment applied to an anchoring drilling tool with a large length-diameter ratio, which is characterized in that thread rolling wheels are used as key structures for machining external threads of a drill rod, the thread rolling wheels are arranged outside a workpiece body in a triangular distribution state, and the thread opening action is performed through the rotation action of the thread rolling wheels and the rotation / straight movement action of the workpiece body; a front clamping block, a central clamping block and a rear clamping block are arranged at three positions of the thread opening action respectively, and the three structures have the basic effect of maintaining the basic position of the workpiece body when the workpiece body passes through the mounting sleeve, so that the primary positioning and supporting effects are achieved; according to the key points, the three structures can perform autonomous stress balance through the inner spring frame and the arch arm under the condition that the workpiece body shakes, and can also drive the small driving arm to perform small-amplitude linear movement through the hydraulic auxiliary assembly, so that the bending degree of the inner spring frame and the arch arm is actively changed; the purpose of passively balancing the stress and maintaining the machining stability is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of cold rolling, in particular to drill rod thread cold rolling equipment applied to anchor drilling tools with a large aspect ratio. Background Art

[0002] What needs to be explained about anchor drill tools with large aspect ratio is that in order to improve the stress state of the threaded part and enhance the fatigue resistance and strength of the thread (drill tool / anchor rod), it is necessary to perform surface strengthening treatment on anchor drill tools with large aspect ratio. Taking the cold rolling process as an example, its essence is to form threads on the outer surface.

[0003] It should be noted that the thread processing length of the drill rod part of the large aspect ratio anchor drill is large. Although the traditional machining method is used, the quality of the processed thread is high, but the production cost is too high. It should also be noted that during the threading process, the processing speed and processing stability between the workpiece and the processing structure need to be guaranteed. The stability of the original parts during the continuous transmission process is also one of the key factors affecting the processing quality. However, during the threading process, the workpiece is affected by the processing structure and locally shakes. The shaking process of the workpiece will also affect the thread processing quality. This application proposes a solution. Summary of the invention

[0004] The purpose of the present invention is to provide a drill pipe thread cold rolling device for anchor drill tools with a large aspect ratio. The device is a threading process for anchor drill tools with a large aspect ratio, because conventional machining methods have high production costs, and the moving speed of the original parts during the machining process (machining speed, machining stability) is also one of the key factors affecting the thread quality.

[0005] The object of the present invention can be achieved through the following technical scheme: a drill pipe thread cold rolling device applied to anchor drill tools with a large aspect ratio, comprising a mounting sleeve, a workpiece body and a straight drive assembly, wherein the workpiece body passes through the center point position of the mounting sleeve through the straight drive assembly, a thread rolling wheel arranged in a ring array along the workpiece body is arranged inside the mounting sleeve, a motor is installed outside the mounting sleeve, and a gear assembly corresponding to the motor and the thread rolling wheel is arranged inside the mounting sleeve;

[0006] An inner spring frame is arranged inside the mounting sleeve along the length direction of the workpiece body and corresponds to the middle position of two adjacent thread rolling wheels. A front clamp block and a rear clamp block are installed at both ends of the inner spring frame, and a bow-shaped arm is installed at a position of the inner spring frame corresponding to the inner wall of the workpiece body. A center clamp block is installed at the middle end of the bow-shaped arm. The center clamp block, the front clamp block and the rear clamp block match the workpiece body.

[0007] It is further configured as follows: the gear assembly consists of an outer ring gear, a cooperating gear and a driving gear, the driving gear is installed on the output shaft of the motor, the cooperating gear is installed on the center point of the thread rolling wheel, and the cooperating gear and the outer ring gear are internally meshed, the outer ring gear and the driving gear are externally meshed, and the thread rolling wheel is rotatably connected inside the mounting sleeve.

[0008] It is further configured as follows: the inner spring frame is in an arched shape and curved outwardly in a direction away from the workpiece body, and the bow-shaped arm is in an arched shape and curved outwardly in a direction close to the workpiece body.

[0009] It is further configured as follows: a cooperative sleeve is arranged between the workpiece body corresponding to the installation sleeve and the rear clamping block, the inner wall of the cooperative sleeve is provided with a thread corresponding to the workpiece body, and a connecting spring is arranged between the cooperative sleeve and the rear clamping block.

[0010] It is further configured as follows: a top pin sleeve is installed on the outer wall of one side of the cooperative sleeve close to the rear clamping block, and a top slot corresponding to the top pin sleeve is provided in the inner wall position of the rear clamping block.

[0011] It is further configured as follows: a hydraulic auxiliary assembly corresponding to the inner spring frame is installed on the outer position of the mounting sleeve, a driving arm is installed on the output shaft position of the hydraulic auxiliary assembly, and a hemispherical sleeve is arranged at the end position of the driving arm.

[0012] It is further configured as follows: an arc frame is installed on the outer wall position of the inner spring frame close to the driving arm, the arc frame is in a curved arch shape in the direction away from the workpiece body, and a hemisphere corresponding to the hemisphere sleeve is installed at the middle position of the arc frame.

[0013] It is further configured as follows: the center plane of the thread rolling wheel and the plane of the center point of the hemisphere are in the same plane position, and the front clamping block and the rear clamping block are arranged in mirror symmetry along the plane of the center point of the hemisphere.

[0014] The present invention has the following beneficial effects:

[0015] 1. Improve the threading action on the outer surface of the drill rod in the anchor drill with a large aspect ratio, and use the thread rolling wheel as the key structure in the threading action. Specifically, the threading purpose is achieved by coordinating the rotating action of the thread rolling wheel with the rotating / linear action of the workpiece body. In order to initially improve the processing stability, multiple thread rolling wheels are distributed in a triangular structure to ensure that the three thread rolling wheels can perform the threading action synchronously.

[0016] 2. Based on the above content, the key is to add a front clamp, a center clamp and a rear clamp at the threading position of the workpiece body. The basic function of the three structures is to maintain the basic position of the workpiece body when it passes through the mounting sleeve. It is mainly to provide external support and protection for the three positions of the workpiece body without interfering with the normal threading action. The three structures are mainly connected and fixed by the inner spring frame and the bow arm. The main purpose is to balance the stress of the three structures autonomously. When not interfering with the threading action, the hydraulic auxiliary assembly can also be used to drive the driving arm to move linearly in a small range, which is used to actively change the bending degree of the inner spring frame and the bow arm, so as to passively balance the stress and maintain the processing stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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 work.

[0018] Figure 1 This is a schematic diagram of the structure of a drill pipe thread cold rolling device applied to a large aspect ratio anchoring drill tool proposed by the present invention;

[0019] Figure 2 It is a lateral schematic diagram of the installation sleeve in the drill pipe thread cold rolling equipment applied to the anchor drilling tool with large aspect ratio proposed by the present invention;

[0020] Figure 3 A cross-sectional view of an installation sleeve in a drill pipe thread cold rolling device for anchoring drilling tools with a large aspect ratio proposed by the present invention;

[0021] Figure 4 This is a schematic diagram of the structure inside the installation sleeve of the drill pipe thread cold rolling equipment applied to the large aspect ratio anchor drilling tool proposed by the present invention;

[0022] Figure 5 The invention proposes a cold rolling device for drill pipe threads applied to anchor drilling tools with large aspect ratio. Figure 4 A right front view of

[0023] Figure 6 It is a front view of a workpiece body corresponding to a thread rolling wheel in a cold rolling device for thread of a drill pipe applied to an anchor drill tool with a large aspect ratio proposed by the present invention;

[0024] Figure 7 This is a schematic structural diagram of an inner spring frame in a drill pipe thread cold rolling device applied to an anchor drill tool with a large aspect ratio, as proposed by the present invention;

[0025] Figure 8It is a front view of the pressure regulator 7 in the drill pipe thread cold rolling equipment applied to the anchor drilling tool with large aspect ratio proposed by the present invention;

[0026] Fig. 9 The invention proposes a cold rolling device for drill pipe threads applied to anchor drilling tools with large aspect ratio. Figure 7 Partial split diagram of .

[0027] In the figure: 1. straight drive assembly; 2. workpiece body; 3. mounting sleeve; 4. hydraulic auxiliary assembly; 5. rear clamp; 6. inner spring frame; 7. front clamp; 8. motor; 9. thread rolling wheel; 10. cooperative sleeve; 11. gear assembly; 12. driving arm; 13. connecting spring; 14. arc frame; 15. top pin sleeve; 16. center clamp; 17. bow arm; 18. top slot. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0029] Embodiment 1: For the threading process of anchoring drill tools with large aspect ratio, since conventional machining methods have high production costs, and the moving speed of the original parts during the machining process (machining speed, machining stability) is also one of the key factors affecting the thread quality, this application proposes the following technical solutions:

[0030] Reference Figures 1 to 9 The drill pipe thread cold rolling device applied to the anchor drill tool with a large aspect ratio in this embodiment comprises a mounting sleeve 3, a workpiece body 2 and a straight driving assembly 1. The workpiece body 2 passes through the center point of the mounting sleeve 3 through the straight driving assembly 1. The mounting sleeve 3 is provided with a thread rolling wheel 9 arranged in a ring array along the workpiece body 2, and the mounting sleeve 3 is provided with a motor 8 outside. The mounting sleeve 3 is provided with a gear assembly 11 corresponding to the motor 8 and the thread rolling wheel 9.

[0031] An inner spring frame 6 is arranged inside the mounting sleeve 3 along the length direction of the workpiece body 2, corresponding to the middle position of two adjacent thread rolling wheels 9, and a front clamping block 7 and a rear clamping block 5 are installed at both ends of the inner spring frame 6, and an arch arm 17 is installed at the inner wall position of the inner spring frame 6 corresponding to the workpiece body 2, and a center clamping block 16 is installed at the middle end of the arch arm 17, and the center clamping block 16, the front clamping block 7 and the rear clamping block 5 match the workpiece body 2;

[0032] The gear assembly 11 consists of an outer ring gear, an assisted gear and a driving gear. The driving gear is installed on the output shaft of the motor 8, and the assisted gear is installed on the center point of the thread rolling wheel 9. The assisted gear and the outer ring gear are internally meshed, and the outer ring gear and the driving gear are externally meshed. The thread rolling wheel 9 is rotatably connected inside the mounting sleeve 3.

[0033] Working principle: Figure 1 For example, the essence of the workpiece body 2 is a drill rod of a drilling tool. The key content of the present invention is to open threads on the outer surface of the workpiece body 2. The function of the straight-line drive assembly 1 is to continuously move linearly on the basis of driving the workpiece body 2 to rotate at a uniform speed, mainly to ensure that the workpiece body 2 continuously and uniformly passes through the mounting sleeve 3. The mounting sleeve 3 is based on a thread rolling wheel 9. The thread opening action is completed in the continuous rotation action of the thread rolling wheel 9 in conjunction with the rotation / linear movement process of the workpiece body 2. The rotation speed, pitch, spiral diameter, etc. of the thread rolling wheel 9, as well as the straight-line speed and rotation speed of the workpiece body 2 can be set according to the thread opening process parameters. The specific process parameters are not limited in the present invention.

[0034] It should be noted that: Figure 6 To explain, because the stability of the triangular structure is the best state, the thread rolling wheels 9 in the present invention are arranged in a circular array at 120 degrees, so that the number of thread rolling wheels 9 is three, and the three thread rolling wheels 9 perform preliminary support and positioning on the workpiece body 2 to ensure the basic stability of the workpiece body 2 when performing the threading action;

[0035] As for the rotation action of each thread rolling wheel 9, specifically, the gear assembly 11 is used to realize directional and constant speed rotation by utilizing the planetary gear structure, and this part will not be elaborated in detail in the present invention.

[0036] Embodiment 2: Explanation of the front clamping block, the rear clamping block and the center clamping block in Embodiment 1:

[0037] The inner spring frame 6 is arched and curved outward in the direction away from the workpiece body 2, and the bow arm 17 is arched and curved outward in the direction close to the workpiece body 2. A cooperative sleeve 10 is arranged between the corresponding mounting sleeve 3 of the workpiece body 2 and the rear clamping block 5. The inner wall of the cooperative sleeve 10 is provided with a thread corresponding to the workpiece body 2, and a connecting spring 13 is arranged between the cooperative sleeve 10 and the rear clamping block 5. A top pin sleeve 15 is installed on the outer wall of the cooperative sleeve 10 on one side close to the rear clamping block 5, and a top groove 18 corresponding to the top pin sleeve 15 is provided in the inner wall position of the rear clamping block 5.

[0038] Solution Description: Refer to Figure 4It can be understood that when the workpiece body 2 enters the center position of the corresponding thread rolling wheel 9, it is set to the action position. For this, the front clamping block 7 and the rear clamping block 5 that match the action position are added in the present invention. Figure 4 and Figure 7 It can be understood that the front clamp block 7 and the rear clamp block 5 are essentially circular blocks, and the front clamp block 7 and the rear clamp block 5 are used to initially support, position, and clamp the workpiece body 2, and initially maintain the stability of the workpiece body 2, and will not interfere with the rotation and linear movement of the workpiece body 2;

[0039] Reference Figure 8 and Fig. 9 In addition, a central clamp 16 is added to the action position, and further reference is made to Figure 5 , wherein the center clamp block 16 is mainly installed in the bow arm 17. As shown in the first embodiment, the three thread rolling wheels 9 are arranged in an array along 120°, and the number of the inner spring frames 6 is three. Specifically, the inner spring frame 6 is arranged in the middle position of the thread rolling wheels 9 in two adjacent positions. Specifically, it is necessary to ensure that the center clamp block 16 will also fully contact the workpiece body 2, but the center clamp block 16 will not contact the thread rolling wheel 9 and will not interfere with the normal thread opening action. The center clamp block 16 supports the center position of the workpiece body 2 in the thread opening action;

[0040] In combination with the above content, it is explained again that the front clamp block 7 and the rear clamp block 5 are connected by the inner spring frame 6. In order to ensure that the front clamp block 7 and the rear clamp block 5 fully support the workpiece body 2, it is necessary to ensure that the front clamp block 7 and the rear clamp block 5 are mirror-symmetrically arranged along the setting position of the thread rolling wheel 9, and the center clamp block 16 is installed on the bow arm 17, wherein the center clamp block 16, the front clamp block 7 and the rear clamp block 5 need to provide inward pressure on the workpiece body 2, and for this purpose, it is necessary to limit the bow arm 17 to ensure bending toward the workpiece body 2, and the front clamp block 7 and the rear clamp block 5 also need to provide pressure on the workpiece body 2, and for this purpose, it is necessary to further limit the inner spring frame 6 from bending in a direction away from the workpiece body 2.

[0041] Embodiment 3: The action states of the inner spring frame and the bow-shaped arm 17 are explained in combination with Embodiment 1 and Embodiment 2:

[0042] A hydraulic assist assembly 4 corresponding to the inner spring frame 6 is installed on the outer position of the mounting sleeve 3, a driving arm 12 is installed on the output shaft position of the hydraulic assist assembly 4, a hemispherical sleeve is arranged at the end position of the driving arm 12, an arc frame 14 is installed on the outer wall position of the inner spring frame 6 close to the driving arm 12, the arc frame 14 is in a curved arch shape in the direction away from the workpiece body 2, and a hemisphere corresponding to the hemispherical sleeve is installed at the middle position of the arc frame 14, the central plane of the thread rolling wheel 9 and the plane of the center point of the hemisphere are in the same plane position, and the front clamping block 7 and the rear clamping block 5 are arranged in mirror symmetry along the plane of the center point of the hemisphere.

[0043] Solution description: Because the structural strength of the anchor drill with a large aspect ratio is relatively large, when the thread is opened by the thread rolling wheel 9, the entire anchor drill with a large aspect ratio generates non-directional vibration, which can be understood as non-directional stress generated on the anchor drill with a large aspect ratio. Although it is supported by the front clamp block 7, the center clamp block 16 and the rear clamp block 5 in the second embodiment, the front clamp block 7, the center clamp block 16 and the rear clamp block 5 are subjected to stress to generate reaction forces of different degrees;

[0044] In this regard, the front clamp block 7 and the rear clamp block 5 are first supported by the inner spring frame 6. After the front clamp block 7 and the rear clamp block 5 have different degrees of reaction forces, they will be transmitted to the inner spring frame 6, causing the inner spring frame 6 to undergo a re-bending deformation process in the direction away from the workpiece body 2, and the center clamp block 16 therein will also be subjected to the reaction force, causing the bow arm 17 to undergo a re-bending deformation process in the direction away from the workpiece body 2, and because the bending process of the bow arm 17 will further provide pressure to the inner spring frame 6, the third bending deformation process will occur after the inner spring frame 6 undergoes the re-bending deformation process, so it can be understood that: the reaction forces received by the front clamp block 7, the center clamp block 16 and the rear clamp block 5 will all be transmitted to the inner spring frame 6;

[0045] Combination Figure 8 and Fig. 9 It is to be noted again that the inner spring frame 6 is connected by the arc frame 14, and the setting direction of the arc frame 14 is parallel to the length direction of the workpiece body 2. When the inner spring frame 6 is subjected to the reaction force from the front clamp block 7, the center clamp block 16 and the rear clamp block 5, the hydraulic auxiliary assembly 4 can provide a force to the center point position of the inner spring frame 6. The hydraulic auxiliary assembly 4 is essentially a hydraulic cylinder structure, and the setting method of the arc frame 14 is further improved:

[0046] The middle end of the arc frame 14 is connected to the driving arm 12 through a hemisphere and a hemisphere sleeve, so that the inner spring frame 6 can perform a small-amplitude free swinging motion relative to the driving arm 12, specifically, it can swing freely according to the reaction force received at the front clamping block 7 and the rear clamping block 5, but the inner spring frame 6 is still subjected to the pressure compensation effect from the driving arm 12. The overall purpose is to ensure that the stresses received at the three positions of the front clamping block 7, the center clamping block 16 and the rear clamping block 5 remain in a relatively balanced state.

[0047] Implementation 4: This implementation example refers to Figure 8 , the workpiece body 2 moves linearly from the front clamping block 7 to the rear clamping block 5, so that the outer surface of the workpiece body 2 corresponding to the right side of the thread rolling wheel 9 is threaded. For this, it is necessary to ensure that the cooperative sleeve 10 and the threaded workpiece body 2 are threadedly connected. Because the workpiece body 2 keeps moving linearly, the cooperative sleeve 10 can move rightward, so that the top pin sleeve 15 is inserted into the top groove 18 in the rear clamping block 5 to squeeze and expand the three rear clamping blocks 5 outward. The purpose is to ensure that the rear clamping block 5 over-extends the threaded attack body 2, but it should be noted that:

[0048] Because the rear clamp 5 is relatively fixed, the rightward movement stroke of the cooperative sleeve 10 is limited. After reaching the maximum movement stroke, it cannot continue to move to the right. The cooperative sleeve 10 can only rotate in conjunction with the outer surface thread of the workpiece body 2. The purpose of this method is: because the workpiece body 2 corresponding to the rear clamp 5 has been threaded, the rear clamp 5 cannot be used to directly clamp and support the workpiece body 2. For this reason, the cooperative sleeve 10 is needed to sense the stress changes of the workpiece body 2 corresponding to the rear clamp 5, but it is still transferred to the rear clamp 5 in the end.

[0049] In summary, the thread rolling wheel is used as the key structure for processing the external thread of the drill rod. The thread rolling wheel is arranged outside the workpiece body in a triangular distribution state. The thread opening action is performed through the rotation action of the thread rolling wheel and the rotation / linear action of the workpiece body. The front clamp block, the center clamp block and the rear clamp block are respectively arranged for the three positions of the thread opening action. The basic function of the three structures is to maintain the basic position of the workpiece body when it passes through the installation sleeve, and play the role of preliminary positioning support. The key lies in:

[0050] The three structures can balance stress autonomously through the inner spring frame and the bow arm when the workpiece body shakes, and can also drive the driving arm to make small linear movements through the hydraulic auxiliary assembly, which is used to actively change the bending degree of the inner spring frame and the bow arm, and passively balance stress to achieve the purpose of maintaining processing stability.

[0051] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A cold rolling device for drill pipe threads used in anchor drilling tools with a large aspect ratio, comprising a mounting sleeve (3), a workpiece body (2) and a straight drive assembly (1), characterized in that: The workpiece body (2) passes through the center point of the installation sleeve (3) through the straight-moving drive assembly (1); a thread rolling wheel (9) arranged in a ring array along the workpiece body (2) is arranged inside the installation sleeve (3); a motor (8) is installed outside the installation sleeve (3); and a gear assembly (11) corresponding to the motor (8) and the thread rolling wheel (9) is arranged inside the installation sleeve (3); An inner spring frame (6) is arranged inside the mounting sleeve (3) along the length direction of the workpiece body (2) and corresponds to the middle position of two adjacent thread rolling wheels (9); a front clamping block (7) and a rear clamping block (5) are installed at both ends of the inner spring frame (6); and a bow-shaped arm (17) is installed at a position of the inner wall of the workpiece body (2) of the inner spring frame (6); a center clamping block (16) is installed at the middle end of the bow-shaped arm (17); and the center clamping block (16), the front clamping block (7) and the rear clamping block (5) match the workpiece body (2).

2. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 1 is characterized in that: The gear assembly (11) is composed of an outer ring gear, an assisted gear and a driving gear. The driving gear is mounted on the output shaft of the motor (8). The assisted gear is mounted on the center point of the thread rolling wheel (9). The assisted gear and the outer ring gear are internally meshed, and the outer ring gear and the driving gear are externally meshed. The thread rolling wheel (9) is rotatably connected inside the mounting sleeve (3).

3. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 1 is characterized in that: The inner spring frame (6) is in an arched shape and curved outward in a direction away from the workpiece body (2), and the bow-shaped arm (17) is in an arched shape and curved outward in a direction close to the workpiece body (2).

4. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 1 is characterized in that: A cooperating sleeve (10) is arranged between the workpiece body (2) and the corresponding mounting sleeve (3) and the rear clamping block (5); a thread corresponding to the workpiece body (2) is arranged on the inner wall of the cooperating sleeve (10); and a connecting spring (13) is arranged between the cooperating sleeve (10) and the rear clamping block (5).

5. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 4 is characterized in that: A top pin sleeve (15) is installed on the outer wall of the cooperative sleeve (10) on one side close to the rear clamping block (5), and a top slot (18) corresponding to the top pin sleeve (15) is provided in the inner wall of the rear clamping block (5).

6. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 1 is characterized in that: A hydraulic auxiliary assembly (4) corresponding to the inner spring frame (6) is installed at the outer position of the mounting sleeve (3), a driving arm (12) is installed at the output shaft position of the hydraulic auxiliary assembly (4), and a hemispherical sleeve is arranged at the end position of the driving arm (12).

7. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 6 is characterized in that: An arc frame (14) is installed on the outer wall of the inner spring frame (6) close to the driving arm (12). The arc frame (14) is in a curved arch shape in a direction away from the workpiece body (2), and a hemisphere corresponding to the hemisphere sleeve is installed in the middle of the arc frame (14).

8. The drill pipe thread cold rolling equipment for anchoring drill tools with large aspect ratio according to claim 7 is characterized in that: The center plane of the thread rolling wheel (9) and the plane of the center point of the hemisphere are located in the same plane position, and the front clamping block (7) and the rear clamping block (5) are arranged in a mirror-symmetrical manner along the plane of the center point of the hemisphere.

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