Steel structure punching equipment with auxiliary structure

By introducing rotating components and fan blades into the steel structure drilling equipment to generate heat dissipation wind, directly dissipating the motor, solving the problem of equipment overheating, and collecting metal debris through the collection of components, solving the problem of debris scattering, achieving a more efficient drilling process.

CN119076999BActive Publication Date: 2025-04-04南通晋弘钢结构工程有限公司
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Patent Information

Application Number
CN202411564347.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-05
Publication Date
2025-04-04
Estimated Expiration
2044-11-05

AI Technical Summary

Technical Problem

During the long-term use of existing steel structure hole drilling equipment, the driving motor is prone to overheating, affecting the service life and drilling efficiency. At the same time, the metal debris generated during the drilling process is difficult to effectively collect, affecting the quality of the drilling.

Method used

A steel structure drilling equipment with auxiliary structure is designed. By setting rotating components and fan blades in the equipment body, a heat dissipation wind force is generated directly through the bottom of the driving motor to improve the heat dissipation efficiency; at the same time, a collection component is used to collect metal chips and wires generated by the drilling to prevent them from scattering.

Benefits of technology

It effectively improves the heat dissipation effect and service life of the drive motor and improves the drilling efficiency; at the same time, by effectively collecting metal debris, the drilling quality and working environment are improved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention provides a steel structure punching device with an auxiliary structure, which relates to the field of steel structure processing, and includes: a chassis component; the chassis component is located at the bottom of the equipment body, a symmetrically arranged positioning plate is fixed inside the chassis component, the inside of the collecting component is a rectangular structure, the two ends of the inside of the collecting component are inclined structures, and a guide hole is provided in the middle of the collecting component, and the guide hole is a funnel-shaped structure. The steel structure is located between the positioning plates, the collecting component is installed on the top of the steel structure, the bottom of the collecting component contacts the top of the steel structure, and the metal shavings and metal wires generated by the punching move to the side through the guide hole, and the moved metal shavings and metal wires are located inside the collecting component to avoid moving outward and scattering, thereby improving the collection effect, and solving the problem that some metal wires and metal debris are generated during the punching process of common steel structure punching equipment, and these metal debris are relatively messy, and if they are not collected and processed, it will affect the punching problem.
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Description

Technical Field

[0001] The invention relates to the technical field of steel structure processing, and in particular to a steel structure punching device with an auxiliary structure. Background Art

[0002] When processing steel structures, it is usually necessary to punch holes in them. The main reasons for punching holes in steel structures include reducing the deadweight of the structure, saving steel, meeting strength requirements, moving the node plastic hinge outward, meeting the requirements of strong nodes and weak components, releasing internal stress, and facilitating the installation of accessories. In the design of steel structures, drilling holes in steel beams can reduce the deadweight of the structure, reduce the amount of lower structure materials, and save steel at the same time. The design is optimized according to the force characteristics. By drilling holes, the closer the steel beam is to the neutral axis, the smaller the stress. The process holes on the steel structure can also be used to install various accessories to improve assembly efficiency. The purpose of drilling holes in steel structures is mainly to optimize structural performance, improve material utilization efficiency, and enhance The durability of the structure and the convenience of subsequent modification or maintenance work. When drilling holes, steel structure punching equipment is needed. Steel structure punching equipment usually controls the smooth movement of the steel structure for drilling through auxiliary structures. The common steel structure punching equipment on the market is prone to overheating of the driving motor during long-term use, which affects the service life and drilling efficiency. In addition, some metal wires and metal debris will be generated during the drilling process. These metal debris are relatively messy. If they are not collected and processed, it will affect the drilling. When the steel structure is moved for drilling, it is usually pushed by manpower, and there is also a round stick that drives the steel structure to move and feed for drilling. However, this round stick is prone to wear when driving the steel structure to move. After wear, it is more cumbersome to replace. Summary of the invention

[0003] The disclosed embodiment relates to a steel structure drilling equipment with an auxiliary structure. When the equipment body is drilling a hole, the drill rod assembly generates a drilling force, which drives the rotating assembly to rotate together. The rotating assembly drives the fan blades to rotate together to generate heat dissipation wind force. The heat dissipation wind force enters the interior of the guide head, then flows inside the connecting pipe, and is discharged through another guide head, so that the heat dissipation wind force directly passes through the bottom of the drive motor, thereby improving the heat dissipation effect and heat dissipation efficiency of the drive motor.

[0004] In a first aspect of the present disclosure, a steel structure punching device with an auxiliary structure is provided, which specifically includes: a device body; a telescopic cylinder is installed at the top of the device body, a rotating assembly is rotatably installed at the bottom of the device body through a supporting assembly, a positioning assembly is fixed on both sides of the rotating assembly of the circular tubular structure, two sets of fan blades are fixed on the outside of the rotating assembly, and a guide head is fixed on the bottom of the device body through a connecting pipe; a chassis component; the chassis component is at the bottom of the device body, the corners of the chassis component are fixedly connected to the ground through bolts, symmetrically arranged positioning plates are fixed inside the chassis component, a cross-shaped channel is formed between the positioning plates, a steel structure and a collecting component are inserted between the positioning plates, the inside of the collecting component is a rectangular structure, the two ends of the inside of the collecting component are inclined structures, and a guide hole is provided in the middle of the collecting component, and the guide hole is a funnel-shaped structure; an external component structure; the external component structure is at the side of the chassis component, and the internal part of the external component structure of the U-shaped structure is installed with a rotating structure through a driving shaft and a driven shaft, and a freely displaceable pressing structure and a positioning rod are installed inside the two ends of the rotating structure through springs, and the positioning rod is a round rod structure with a protrusion on the top.

[0005] In at least some embodiments, a driving motor is installed at the rear end of the device body, and the driving motor is connected to the sliding structure through a transmission structure. A freely pullable drill rod assembly is inserted into the interior of the sliding structure, and the sliding structure drives the drill rod assembly to rotate together. The top end of the drill rod assembly is connected to the telescopic cylinder and is driven up and down by the telescopic cylinder. A drilling drill bit is provided at the bottom of the drill rod assembly; a slide groove is respectively provided on both sides of the drill rod assembly, and a positioning assembly is inserted into the interior of the slide groove. The drill rod assembly and the guide hole are on the same axis, and the support assembly is a circular ring structure; a connecting pipe is fixed to the bottom of the device body through a square plate, and the connecting pipe is a U-shaped tubular structure with openings at both ends. A guide head is fixed to each end of the connecting pipe, and the guide head at the front end is located below the two groups of fan blades, and the guide head at the rear end is directly below the driving motor.

[0006] In at least some embodiments, a support rod is welded and fixed to the top of the base frame component, and the inner end of the support rod is connected to the side of the equipment body by bolts; a guide plate is integrally formed inside the base frame component, and the front end of the guide plate is fixedly connected to the external structure; freely rotating rotating rod components are installed at both ends and the middle position of the guide plate through grooves and rotating shafts, and the top of the rotating rod component contacts the bottom of the steel structure; two baffle components are fixed at both ends of the guide plate, and a steel structure is inserted between the baffle components on both sides of the same end; an auxiliary plate is fixed to the outside of the baffle component, and a movable rod component that can be freely moved up and down is inserted into the inside of the auxiliary plate, the bottom end of the movable rod component is made of flexible rubber material, and a spring is mounted on the outside of the movable rod component, and the top of the spring contacts the bottom of the auxiliary plate and continuously pushes the movable rod component to move downward.

[0007] In at least some embodiments, two freely rotatable driving shafts are installed on the right side of the external structure, and two freely rotatable driven shafts are installed on the left side of the external structure, positioning rods are respectively inserted into the inside of the driving shaft and the driven shaft, and the two driving shafts are connected by a transmission belt; a mounting plate structure is fixed on the side of the external structure, a servo motor is fixed to the top of the mounting plate structure by bolts, and the servo motor is connected to a driving shaft through a transmission wheel and a transmission belt; the outside of the rotating structure is provided with anti-skid teeth that are evenly staggered, and the anti-skid teeth are wedge-shaped structures.

[0008] The present invention provides a steel structure punching device with an auxiliary structure, which has the following beneficial effects:

[0009] When the equipment body is drilling, the drill rod assembly generates a drilling force, which drives the rotating assembly to rotate together. The rotating assembly drives the fan blades to rotate together, generating heat dissipation wind force. The heat dissipation wind force enters the interior of the guide head, then flows inside the connecting pipe, and is discharged through another guide head, so that the heat dissipation wind force directly passes through the bottom of the drive motor, thereby improving the heat dissipation effect and heat dissipation efficiency of the drive motor.

[0010] When the equipment body is drilling, the steel structure is between the positioning plates, and the collecting component is installed on the top of the steel structure. The bottom of the collecting component is in contact with the top of the steel structure. When drilling, the drill bit drills through the guide hole, and the metal chips and metal wires generated by the drilling move to the side. The moved metal chips and metal wires are inside the collecting component. The collecting component directly collects the metal chips and metal wires to prevent them from moving outward and scattering, thereby improving the collection effect.

[0011] When the steel structure is driven to move, the servo motor drives the active shaft to drive the rotating structure to rotate together, so that the rotating structure contacts the steel structure through the anti-skid teeth, drives the steel structure to move, and makes the steel structure convenient to move and adjust the position for drilling. When the anti-skid teeth are worn after the rotating structure has been used many times, the pressing structure can be directly pressed to retract, so that it drives the positioning rod to move together. At the same time, the positioning rod is disengaged from the inside of the active shaft and the driven shaft, so that the rotating structure is released and controlled to be easily raised and removed, thereby improving replacement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0013] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0014] In the attached picture:

[0015] Figure 1 A three-dimensional structural schematic diagram of the present application is shown;

[0016] Figure 2 A bottom-up structural schematic diagram of the present application is shown;

[0017] Figure 3 The exploded three-dimensional structure diagram of the present application is shown;

[0018] Figure 4 The figure shows the exploded bottom view structure diagram of the present application;

[0019] Figure 5 A schematic diagram of the exploded three-dimensional structure of the device body of the present application is shown;

[0020] Figure 6 A schematic diagram of the exploded bottom view of the device body of the present application is shown;

[0021] Figure 7 The bottom part of the present application is shown in a three-dimensional exploded view and a partially enlarged structural schematic diagram;

[0022] Figure 8 A schematic diagram of the exploded three-dimensional structure of the external component structure of the present application is shown.

[0023] Reference numerals list

[0024] 1. Equipment body; 101. Driving motor; 102. Drill rod assembly; 103. Support assembly; 104. Rotating assembly; 105. Positioning assembly; 106. Segment; 107. Guide head; 108. Connecting pipe;

[0025] 2. chassis component; 201. support rod; 202. guide plate; 203. rotating rod component; 204. baffle component; 205. auxiliary plate; 206. moving rod component; 207. positioning plate; 208. collecting component;

[0026] 3. External structure; 301. Driving shaft; 302. Driven shaft; 303. Mounting plate structure; 304. Servo motor; 305. Rotating structure; 306. Anti-slip teeth; 307. Pressing structure; 308. Positioning rod. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment 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.

[0028] Example 1: Please refer to Figures 1 to 8 :

[0029] The present invention proposes a steel structure drilling equipment with an auxiliary structure, comprising: an equipment body 1; a telescopic cylinder is installed at the top of the equipment body 1 to drive a drill rod assembly 102 to move up and down to drill holes; a rotating assembly 104 is rotatably installed at the bottom of the equipment body 1 through a support assembly 103; a positioning assembly 105 is fixed on both sides of the rotating assembly 104 of a circular tubular structure, which is inserted into the internal positioning of a slide slot so that the drill rod assembly 102 drives the rotating assembly 104 to rotate together; two groups of fan blades 106 are fixed on the outside of the rotating assembly 104 to drive the fan blades 106 to rotate together to generate heat dissipation wind force; a guide head 107 is fixed at the bottom of the equipment body 1 through a connecting pipe 108 so that wind can flow inside the connecting pipe 108 and then be discharged through the guide head 107 to dissipate heat for the drive motor 101, thereby improving the heat dissipation efficiency; a chassis component 2; the chassis component 2 is located at the bottom of the equipment body 1, and the corners of the chassis component 2 are fixedly connected to the ground through bolts; symmetrically arranged positioning plates 207 are fixed inside the chassis component 2, and a cross-shaped through hole is formed between the positioning plates 207. The steel structure and the collecting component 208 are inserted between the positioning plates 207, so that the steel structure is guided and moved inside to make a guide hole. The inside of the collecting component 208 is a rectangular structure, and the two ends of the inside of the collecting component 208 are inclined structures. A guide hole is provided in the middle of the collecting component 208. The guide hole is a funnel-shaped structure, so that the drill bit can punch through the guide hole. The metal chips and metal wires generated by the punching enter the inside of the collecting component 208 for collection, so as to prevent the chips from scattering; the outer structure 3; the outer structure 3 is located on the side of the bottom frame component 2, and the outer part of the U-shaped structure is provided with a guide hole. A rotating structure 305 is installed inside the component structure 3 through the driving shaft 301 and the driven shaft 302. A freely displaceable pressing structure 307 and a positioning rod 308 are installed inside the two ends of the rotating structure 305 through springs. The positioning rod 308 is a round rod structure with a protrusion on the top, which is inserted into the driving shaft 301 and the driven shaft 302 to enable quick installation of the rotating structure 305. When the pressing structure 307 moves, it drives the positioning rod 308 to move together, compresses the spring, and makes the rotating structure 305 easy to disassemble and replace.

[0030] In the present disclosure, Figure 5 and Figure 6As shown, a driving motor 101 is installed at the rear end of the equipment body 1, and the driving motor 101 is connected to the sliding structure through a transmission structure. A freely pullable drill rod assembly 102 is inserted into the interior of the sliding structure, so that the drill rod assembly 102 can move up and down freely without affecting the rotation. The sliding structure drives the drill rod assembly 102 to rotate together. The top of the drill rod assembly 102 is connected to the telescopic cylinder and is driven up and down by the telescopic cylinder. A drilling drill bit is provided at the bottom of the drill rod assembly 102; a slide groove is respectively provided on both sides of the drill rod assembly 102, and a positioning assembly 105 is inserted into the interior of the slide groove. 2 is on the same axis as the guide hole, the support assembly 103 is a circular ring structure, and the support rotating assembly 104 is used for smooth rotation; a connecting pipe 108 is fixed to the bottom of the equipment body 1 through a square plate, and the connecting pipe 108 is a U-shaped tubular structure with two ends opened, so that the heat dissipation wind can flow inside it to improve the heat dissipation efficiency, and a guide head 107 is fixed to each end of the connecting pipe 108, the guide head 107 at the front end is located below the two sets of fan blades 106, and the guide head 107 at the rear end is located directly below the drive motor 101, so that the wind can be controlled to guide the flow, so that the wind can directly dissipate heat for the drive motor 101.

[0031] In the present disclosure, Figure 3 and Figure 7 As shown, a support rod 201 is welded and fixed to the top of the chassis component 2, and the inner end of the support rod 201 is connected to the side of the equipment body 1 by bolts to firmly support the equipment body 1 for use. A guide plate 202 is integrally formed inside the chassis component 2, and the front end of the guide plate 202 is fixedly connected to the external structure 3; the two ends and the middle position of the guide plate 202 are installed with a freely rotating rotating rod component 203 through a groove and a rotating shaft, and the top of the rotating rod component 203 contacts the bottom of the steel structure, so that the steel structure can move smoothly to adjust the punching position, and two ends of the guide plate 202 are respectively fixed A baffle component 204, and a steel structure is inserted between the baffle components 204 on both sides of the same end; an auxiliary plate 205 is fixed to the outside of the baffle component 204 to control the positioning and movement of the steel structure, and a movable rod component 206 that can be freely moved up and down is inserted into the inside of the auxiliary plate 205. The bottom end of the movable rod component 206 is made of flexible rubber material, and a spring is mounted on the outside of the movable rod component 206. The top end of the spring contacts the bottom of the auxiliary plate 205 and continuously pushes the movable rod component 206 to move downward, so that the bottom of the movable rod component 206 is in anti-slip contact with the ground, thereby improving the positioning effect of the guide plate 202.

[0032] In the present disclosure, Figure 4 and Figure 8As shown, two freely rotatable driving shafts 301 are installed on the right side of the outer structure 3, and two freely rotatable driven shafts 302 are installed on the left side of the outer structure 3. The positioning rods 308 are respectively inserted into the driving shaft 301 and the driven shaft 302. The rotating structure 305 is conveniently installed and used by controlling the positioning rods 308. The two driving shafts 301 are connected by a transmission belt; a mounting plate structure 303 is fixed on the side of the outer structure 3, and a servo motor 304 is fixed to the top of the mounting plate structure 303 by bolts. The servo motor 304 is connected to a driving shaft 301 through a transmission wheel and a transmission belt, so that the two driving shafts 301 are rotated at the same time; the outside of the rotating structure 305 is provided with anti-skid teeth 306 that are evenly staggered. The anti-skid teeth 306 are wedge-shaped structures, which are used to contact with the bottom of the steel structure, so that the steel structure can move smoothly and adjust the punching position.

[0033] Embodiment 2: Based on embodiment 1, the anti-slip teeth 306 may be made of rubber material to improve the anti-slip contact effect.

[0034] Embodiment 3: Based on embodiment 1, the anti-slip teeth 306 may be made of metal to improve the wear resistance and service life.

[0035] The working principle of this embodiment is as follows: when it is necessary to drill a hole in the steel structure, the base frame component 2 can be directly controlled to be fixed at the required position by bolts, and then the steel structure can be controlled to be placed above the guide plate 202, the steel structure is between the baffle component 204 and the positioning plate 207, the bottom of the steel structure is in contact with the anti-slip teeth 306 and the rotating rod component 203, and then the collecting component 208 is controlled to be installed between the positioning plates 207, so that the bottom of the collecting component 208 is in contact with the top of the steel structure, so that the drill rod assembly 102 is aligned with the guide hole. When drilling, the drive motor 101 and the servo motor 304 are controlled to operate, the drive motor 101 controls the drill rod assembly 102 to rotate, the drill rod assembly 102 controls the rotating component 104 to rotate quickly together through the slide groove and the positioning component 105, and the rotating component 104 drives the fan blade 106 to rotate together. After the fan blade 106 rotates, a heat dissipation airflow is generated. After the heat dissipation airflow passes through the connecting pipe 108, it is discharged from another guide head 107. The exhaust gas is discharged so that the heat dissipation airflow directly passes through the bottom of the drive motor 101 to dissipate the heat of the drive motor 101 and improve the heat dissipation efficiency. Then the telescopic cylinder drives the drill rod assembly 102 to move downward, and the bottom of the drill rod assembly 102 passes through the guide hole to punch holes in the steel structure. During the punching process, the generated metal chips and metal wires move and diffuse outward, so that they enter the interior of the collecting component 208 for convenient collection and storage, thereby preventing the metal chips and metal wires from being scattered. When adjusting the punching position, the servo motor 304 drives the rotating structure 305 and the anti-skid teeth 306 to rotate, and the anti-skid teeth 306 push the steel structure to move and switch the punching position. When the anti-skid teeth 306 are worn after being used many times and affect the movement of the steel structure, the pressing structure 307 can be directly squeezed to drive the positioning rod 308 to move together. The positioning rod 308 is detached from the inside of the active shaft 301 and the driven shaft 302, thereby releasing the fixation of the rotating structure 305 and conveniently disassembling the rotating structure 305 for replacement.

[0036] In this article, there are a few points to note:

[0037] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0038] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0039] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A steel structure punching device with an auxiliary structure, characterized in that: include: Equipment body; a telescopic cylinder is installed on the top of the equipment body, and a rotating assembly is rotatably installed on the bottom of the equipment body through a supporting assembly. A positioning assembly is fixed on both sides of the rotating assembly of the circular tubular structure, and two sets of fan blades are fixed on the outside of the rotating assembly. A guide head is fixed on the bottom of the equipment body through a connecting pipe; chassis component; the chassis component is at the bottom of the equipment body, and the corners of the chassis component are fixed to the ground by bolts. The interior of the chassis component is fixed with symmetrically arranged positioning plates, and a cross-shaped channel is formed between the positioning plates. Steel structures and collecting components are inserted between the positioning plates. The interior of the collecting component is a rectangular structure, and the two ends of the interior of the collecting component are inclined structures. A guide hole is provided in the middle of the collecting component, and the guide hole is a funnel-shaped structure; external structure; the external structure is on the side of the chassis component, and the U-shaped structure A rotating structure is installed inside the external structure through a driving shaft and a driven shaft, and a freely displaceable pressing structure and a positioning rod are installed inside the two ends of the rotating structure through springs. The positioning rod is a round rod structure with a protrusion on the top; a driving motor is installed at the rear end of the equipment body, and the driving motor is connected to the sliding structure through a transmission structure. A freely withdrawn drill rod assembly is inserted into the sliding structure, and the sliding structure drives the drill rod assembly to rotate together. The top of the drill rod assembly is connected to the telescopic cylinder and is driven up and down by the telescopic cylinder. A drilling drill bit is provided at the bottom of the drill rod assembly; a connecting pipe is fixed to the bottom of the equipment body through a square plate. The connecting pipe is a U-shaped tubular structure with openings at both ends. A guide head is fixed to each end of the connecting pipe, and the guide head at the front end is located below the two groups of fan blades, and the guide head at the rear end is directly below the driving motor.

2. A steel structure punching device with an auxiliary structure according to claim 1, characterized in that: A slide groove is respectively provided on both sides of the drill rod assembly, a positioning assembly is inserted into the slide groove, the drill rod assembly and the guide hole are on the same axis, and the support assembly is a circular ring structure.

3. A steel structure punching device with an auxiliary structure according to claim 2, characterized in that: A support rod is welded and fixed to the top of the chassis component, and the inner end of the support rod is connected to the side of the equipment body by bolts. A guide plate is integrally formed inside the chassis component, and the front end of the guide plate is fixedly connected to the external structure.

4. A steel structure punching device with an auxiliary structure according to claim 3, characterized in that: Freely rotating rotating rod components are installed at both ends and the middle position of the guide plate through grooves and rotating shafts. The top of the rotating rod component contacts the bottom of the steel structure. Two baffle components are fixed at both ends of the guide plate, and a steel structure is inserted between the baffle components on both sides of the same end.

5. A steel structure punching device with an auxiliary structure according to claim 4, characterized in that: An auxiliary plate is fixed on the outside of the baffle component, and a movable rod component that can move freely up and down is inserted into the inside of the auxiliary plate. The bottom end of the movable rod component is made of flexible rubber material, and a spring is mounted on the outside of the movable rod component. The top end of the spring contacts the bottom of the auxiliary plate and continuously pushes the movable rod component downward.

6. A steel structure punching device with an auxiliary structure according to claim 5, characterized in that: Two freely rotatable driving shafts are installed on the right side of the outer structure, and two freely rotatable driven shafts are installed on the left side of the outer structure. Positioning rods are respectively inserted into the driving shaft and the driven shaft, and the two driving shafts are connected by a transmission belt.

7. A steel structure punching device with an auxiliary structure according to claim 6, characterized in that: A mounting plate structure is fixed on the side of the external structure, a servo motor is fixed on the top of the mounting plate structure by bolts, and the servo motor is connected to a driving shaft through a transmission wheel and a transmission belt.

8. A steel structure punching device with an auxiliary structure according to claim 7, characterized in that: The outside of the rotating structure is provided with anti-skid teeth which are evenly and staggeredly arranged, and the anti-skid teeth are wedge-shaped structures.

Citation Information

Patent Citations

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