Straightness correcting device for steel structure prefabricated part
By designing a steel structure prefabricated parts straightening correction device that includes conveying, cleaning, heating and correction mechanisms, the problem that existing devices cannot be polished and cold correction methods destroy the steel structure, and efficient steel cleaning, heating and correction are achieved, and production efficiency and mechanical properties of the steel are improved.
Patent Information
- Application Number
- CN202422044729.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-22
AI Technical Summary
The existing flat correction device for prefabricated steel structures cannot be polished, resulting in time-consuming and labor-intensive manual polishing and low production efficiency; at the same time, the cold correction method is easy to damage the internal metal structure of the steel structure, reduce the mechanical properties, and rust and dirt affect the correction effect.
A steel structure prefabricated parts straightening correction device including a conveying mechanism, a cleaning mechanism, a heating mechanism and a correction mechanism is designed. The cleaning mechanism cleans up the rust and dirt on the surface of the steel through a two-way screw and a motor-driven gear system. The heating mechanism uses electromagnetic induction heating technology to heat the steel, and the correction mechanism achieves straightening correction of the steel through a telescopic rod and connecting rod system.
The cleanliness of the steel surface is improved by setting the cleaning mechanism, and the correction accuracy and speed are improved by setting the heating mechanism. The correction mechanism can effectively correct the steel straight, improve production efficiency and retain the mechanical properties of the steel.
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Figure CN223011611U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steel production equipment, in particular to a straightening device for steel structure prefabricated parts. Background Art
[0002] Structure correction is a process method that, through external force or heating, elongates the fibers of the shorter part of the steel; or shortens the fibers of the longer part, and finally forces the steel to deform reversely, so that the material or component reaches straightness and certain geometric shape requirements and meets technical standards. The main forms of correction are: straightening: eliminating the bending of materials or components; flattening: eliminating the warping or unevenness of materials or components; shaping: shaping a certain geometric shape of components. Correction principle: Utilize the plasticity and the characteristics of thermal expansion and contraction of steel, and force the steel to deform reversely by external force or internal stress to eliminate defects such as bending, warping, and unevenness of the steel, so as to achieve the purpose of correction. The existing straightening devices for steel structure prefabricated parts cannot polish the prefabricated parts, resulting in the problems of time-consuming and laborious manual polishing and low production efficiency.
[0003] For example, the patent document with the publication number of CN220427477U discloses a straightening device for large steel structure prefabricated parts, including a first ball screw, a first moving block, a first motor, and a polishing ball. The outer wall of the first ball screw is sleeved with the first moving block. The bottom of the outer wall of the first moving block is provided with a first motor. The bottom of the outer wall of the first motor is provided with a first rotating shaft. The bottom of the outer wall of the first rotating shaft is provided with a polishing ball. In the prior art, most of the straightening devices for steel structure prefabricated parts adopt cold correction methods, which are easy to damage the internal metal structure of steel structure parts and reduce the mechanical properties of steel structure prefabricated parts. Moreover, the rust and dirt on the surface of steel structure prefabricated parts may affect the straightening of prefabricated parts. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a straightening device for steel structure prefabricated parts to solve the above problems.
[0005] The utility model realizes the above purpose through the following technical solutions:
[0006] A straightening device for steel structure prefabricated parts includes a conveying mechanism. A cleaning mechanism is arranged on the front side of the conveying mechanism. A heating mechanism is arranged in the middle of the conveying mechanism. A correction mechanism is arranged at the rear of the conveying mechanism. The correction mechanism includes a correction bracket fixedly connected to the conveying mechanism. A first telescopic rod is fixedly connected to the lower side inside the correction bracket. The output end of the first telescopic rod is fixedly connected with a centering rotating block. Symmetrically arranged first connecting rods are rotatably connected to both sides of the centering rotating block. The other ends of the first connecting rods are rotatably connected with centering correction plates. Symmetrically arranged centering guide rods are fixedly connected to the correction bracket. The centering guide rods are slidably connected with the centering correction plates. A centering correction roller is rotatably connected to one side of the centering correction plate.
[0007] Preferably, symmetrically arranged fourth motors are fixedly connected to the upper end of the correction bracket. The output ends of the fourth motors are fixedly connected with correction screws. Transverse plate guide rods are symmetrically arranged on both sides of the correction screws and are fixedly connected to the correction bracket. A vertical sliding block is threadedly connected to the correction screw. One side of the vertical sliding block is fixedly connected with a second telescopic rod, and the other side of the vertical sliding block is slidably connected to the correction bracket. The output end of the second telescopic rod is fixedly connected with a vertical rotating block. Symmetrically arranged second connecting rods are rotatably connected to both sides of the vertical rotating block. The other ends of the second connecting rods are rotatably connected to a transverse plate correction frame. The transverse plate correction frame is slidably connected to the transverse plate guide rod and is also slidably connected to the correction bracket. A number of horizontally and evenly arranged transverse plate inner correction rollers are rotatably connected to the other side of the transverse plate correction frame. A third telescopic rod is fixedly connected to the top of the correction bracket. The output end of the third telescopic rod is fixedly connected with a transverse roller support frame. A number of horizontally and evenly arranged transverse plate outer correction rollers are rotatably connected to the lower end of the transverse roller support frame.
[0008] Preferably, the conveying mechanism includes a conveying bracket fixedly connected to the correction bracket. A first motor is fixedly connected to the conveying bracket. The output end of the first motor is fixedly connected with a driving roller, and the conveying bracket is rotatably connected to the driving roller.
[0009] Preferably, the heating mechanism includes a heating cylinder fixedly connected to the conveying bracket. Electromagnetic induction wires with evenly arranged threads are fixedly connected to the inner wall of the heating cylinder.
[0010] Preferably, the cleaning mechanism includes a cleaning bracket fixedly connected to the conveying bracket. A second motor is fixedly connected to one side of the cleaning bracket. The output end of the second motor is fixedly connected with a cleaning double screw. Threads with opposite rotation directions are arranged at both ends of the cleaning double screw. Cleaning guide rods are symmetrically arranged on both sides of the cleaning double screw and are fixedly connected to the cleaning bracket. Symmetrically arranged side cleaning plates are threadedly connected to the cleaning double screw. A side cleaning block is detachably connected to one side of the side cleaning plate. A third motor is fixedly connected to the upper end of the cleaning bracket. The output end of the third motor is fixedly connected with a driving gear. A driven gear is meshed with one side of the driving gear. A cleaning vertical screw is slidably connected to the cleaning bracket. The cleaning vertical screw is threadedly connected to the driven gear. A top cleaning plate is fixedly connected to the lower end of the cleaning vertical screw. Cleaning blocks are arranged on the lower side of the top cleaning plate. A cleaning vertical guide rod is arranged on one side of the cleaning vertical screw.
[0011] Preferably, a temperature sensor is arranged at the rear side of the heating cylinder.
[0012] The beneficial effects are as follows: By setting up the cleaning mechanism, rust and dirt on the steel structure prefabricated parts can be swept away from the steel structure and the bracket, so that the straightening quality of the prefabricated parts can be improved. By setting up the heating mechanism, the straightening quality accuracy of the prefabricated parts can be improved by using the thermal straightening method. The heating method adopts electromagnetic induction heating, which can heat the steel structure parts more quickly. By setting up the straightening mechanism, straightening can be carried out on steel structure prefabricated parts of different models and types.
[0013] The additional technical features and their advantages of the present utility model will be described more clearly in the following description content, or can be understood through the specific practice of the present utility model. Brief Description of the Drawings
[0014] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the following specific implementation manners, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the drawings:
[0015] Figure 1 is a perspective view of a straightening device for steel structure prefabricated parts of the present utility model;
[0016] Figure 2 is a schematic structural diagram of the cleaning mechanism of a straightening device for steel structure prefabricated parts of the present utility model;
[0017] Figure 3 is a schematic structural diagram of the straightening mechanism of a straightening device for steel structure prefabricated parts of the present utility model;
[0018] Figure 4 is a front view of the straightening mechanism of a straightening device for steel structure prefabricated parts of the present utility model;
[0019] Figure 5 is a schematic structural diagram of the heating mechanism of a straightening device for steel structure prefabricated parts of the present utility model.
[0020] The description of the reference numerals is as follows:
[0021] 101. Transfer bracket; 102. First motor; 103. Driving roller; 201. Cleaning bracket; 202. Second motor; 203. Cleaning bidirectional screw; 204. Cleaning guide rod; 205. Side cleaning plate; 206. Side cleaning block; 207. Third motor; 208. Cleaning vertical screw; 209. Driving gear; 210. Driven gear; 211. Top cleaning plate; 212. Cleaning vertical guide rod; 301. Heating cylinder; 302. Electromagnetic induction wire; 401. Correction bracket; 402. First telescopic rod; 403. Centering rotating block; 404. First connecting rod; 405. Centering correction plate; 406. Centering guide rod; 407. Centering correction roller; 408. Fourth motor; 409. Correction screw; 410. Cross plate guide rod; 411. Cross plate correction frame; 412. Second connecting rod; 413. Vertical rotating block; 414. Second telescopic rod; 415. Vertical sliding block; 416. Inner cross plate correction roller; 417. Third telescopic rod; 418. Cross roller support frame; 419. Outer cross plate correction roller. Detailed implementation manner
[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0024] The present invention will be further described below in conjunction with the accompanying drawings:
[0025] Such as Figures 1 - 5As shown in the figure, a straightening device for steel structure prefabricated parts includes a conveying mechanism. A cleaning mechanism is arranged on the front side of the conveying mechanism, a heating mechanism is arranged in the middle of the conveying mechanism, and a straightening mechanism is arranged at the rear of the conveying mechanism. The straightening mechanism includes a straightening bracket 401 fixedly connected to the conveying mechanism. A first telescopic rod 402 is fixedly connected to the lower side inside the straightening bracket 401. The output end of the first telescopic rod 402 is fixedly connected to a centering rotating block 403. Symmetrically arranged first connecting rods 404 are rotatably connected to both sides of the centering rotating block 403. The other end of the first connecting rod 404 is rotatably connected to a centering correction plate 405. Centering guide rods 406 arranged symmetrically are fixedly connected to the straightening bracket 401. The centering guide rods 406 are slidably connected to the centering correction plate 405. A centering correction roller 407 is rotatably connected to one side of the centering correction plate 405. Fourth motors 408 arranged symmetrically are fixedly connected to the upper end of the straightening bracket 401. The output end of the fourth motor 408 is fixedly connected to a correction screw rod 409. Transverse plate guide rods 410 are symmetrically arranged on both sides of the correction screw rod 409. The transverse plate guide rods 410 are fixedly connected to the straightening bracket 401. A vertical sliding block 415 is threadedly connected to the correction screw rod 409. A second telescopic rod 414 is fixedly connected to one side of the vertical sliding block 415. The other side of the vertical sliding block 415 is slidably connected to the straightening bracket 401. The output end of the second telescopic rod 414 is fixedly connected to a vertical rotating block 413. Symmetrically arranged second connecting rods 412 are rotatably connected to both sides of the vertical rotating block 413. The other end of the second connecting rod 412 is rotatably connected to a transverse plate straightening frame 411. The transverse plate straightening frame 411 is slidably connected to the transverse plate guide rods 410. The transverse plate straightening frame 411 is slidably connected to the straightening bracket 401. A number of horizontally and evenly arranged transverse plate inner correction rollers 416 are rotatably connected to the other side of the transverse plate straightening frame 411. A third telescopic rod 417 is fixedly connected to the top of the straightening bracket 401. The output end of the third telescopic rod 417 is fixedly connected to a transverse roller support frame 418. A number of horizontally and evenly arranged transverse plate outer correction rollers 419 are rotatably connected to the lower end of the transverse roller support frame 418. When the first telescopic rod 402 expands and contracts, it drives the centering rotating block 403 to move up and down. The movement of the centering rotating block 403 drives the first connecting rod 404 to move. The movement of the first connecting rod 404 drives the centering correction plate 405 to move towards each other along the centering guide rods 406, so that the centering correction rollers 407 clamp the steel structure prefabricated parts, and the automatic centering of the steel structure prefabricated parts can be completed. When the fourth motor 408 rotates, it drives the correction screw rod 409 to rotate. The rotation of the correction screw rod 409 drives the vertical sliding block 415 and other components thereon to move up and down. In this way, the vertical position of the transverse plate inner correction rollers 416 can be adjusted. The expansion and contraction of the second telescopic rod 414 drives the vertical rotating block 413 to move horizontally. The movement of the vertical rotating block 413 drives the second connecting rod 412 to move. The movement of the second connecting rod 412 drives the transverse plate straightening frame 411 to move towards each other. The expansion and contraction of the third telescopic rod 417 drives the transverse roller support frame 418 to move up and down so that the transverse plate outer correction rollers 419 contact the steel structure prefabricated parts.In this way, the outer straightening roller 419 of the transverse plate and the inner straightening roller 416 of the transverse plate can clamp the transverse plate of the steel structure prefabricated part, and the heated steel structure prefabricated part can be straightened flat through the setting of the straightening mechanism.
[0026] The conveying mechanism includes a conveying bracket 101 fixedly connected to the straightening bracket 401. A first motor 102 is fixedly connected to the conveying bracket 101. The output end of the first motor 102 is fixedly connected to a driving roller 103. The conveying bracket 101 is rotatably connected to the driving roller 103. The rotation of the first motor 102 drives the driving roller 103 to rotate, and the rotation of the driving roller 103 drives the steel structure prefabricated part placed on the conveying mechanism to move successively through the cleaning mechanism, the heating mechanism and the straightening mechanism provided on the conveying mechanism.
[0027] The heating mechanism includes a heating cylinder 301 fixedly connected to the conveying bracket 101. The inner wall of the heating cylinder 301 is fixedly connected with electromagnetic induction wires 302 with uniformly arranged threads. A temperature sensor is arranged at the rear side of the heating cylinder 301. The steel structure prefabricated part passes through the heating mechanism. At this time, an electric current passes through the electromagnetic induction wires 302, and the steel structure prefabricated part is heated by electromagnetic induction heating. The temperature sensor can monitor the temperature of the steel structure prefabricated part to prevent the temperature from being too high.
[0028] The cleaning mechanism includes a cleaning bracket 201 fixedly connected to the conveying bracket 101. On one side of the cleaning bracket 201, a second motor 202 is fixedly connected. The output end of the second motor 202 is fixedly connected to a cleaning double screw 203. Threads with opposite helix directions are provided at both ends of the cleaning double screw 203. Cleaning guide rods 204 are symmetrically arranged on both sides of the cleaning double screw 203. The cleaning guide rods 204 are fixedly connected to the cleaning bracket 201. Side cleaning plates 205 arranged symmetrically are threadedly connected to the cleaning double screw 203. A side cleaning block 206 is detachably connected to one side of the side cleaning plate 205. A third motor 207 is fixedly connected to the upper end of the cleaning bracket 201. The output end of the third motor 207 is fixedly connected to a driving gear 209. A driven gear 210 is engaged with one side of the driving gear 209. A cleaning vertical screw 208 is slidably connected to the cleaning bracket 201. The cleaning vertical screw 208 is threadedly connected to the driven gear 210. A top cleaning plate 211 is fixedly connected to the lower end of the cleaning vertical screw 208. Cleaning blocks are arranged on the lower side of the top cleaning plate 211. A cleaning vertical guide rod 212 is arranged on one side of the cleaning vertical screw 208. The rotation of the second motor 202 drives the cleaning double screw 203 to rotate. The rotation of the cleaning double screw 203 drives the side cleaning plates 205 to move towards each other along the cleaning guide rods 204, so that the side cleaning blocks 206 contact the middle plate of the steel structure prefabricated part. The movement of the third motor 207 drives the driving gear 209 to rotate. The rotation of the driving gear 209 drives the driven gear 210 to rotate. The rotation of the driven gear 210 drives the cleaning vertical screw 208 to move up and down, so that the top cleaning plate 211 contacts the upper cross plate of the steel structure prefabricated part. In this way, the steel structure prefabricated part is driven by the conveying mechanism and the surface is cleaned by the cleaning mechanism.
[0029] Working principle: The staff places the steel structure prefabricated parts on the conveying mechanism. The first motor 102 rotates to drive the driving roller 103 to rotate. The driving roller 103 rotates to drive the steel structure prefabricated parts placed on the conveying mechanism to move successively through the cleaning mechanism, heating mechanism and straightening mechanism arranged on the conveying mechanism. When the cleaning mechanism is started, the second motor 202 rotates to drive the cleaning double screw 203 to rotate. The cleaning double screw 203 rotates to drive the side cleaning plates 205 to move towards each other along the cleaning guide rods 204, so that the side cleaning blocks 206 contact the middle plate of the steel structure prefabricated parts. The third motor 207 moves to drive the driving gear 209 to rotate. The driving gear 209 rotates to drive the driven gear 210 to rotate. The driven gear 210 rotates to drive the cleaning vertical screw 208 to move up and down, so that the top cleaning plate 211 contacts the upper cross plate of the steel structure prefabricated parts. In this way, the steel structure prefabricated parts are driven by the conveying mechanism to clean the surface by using the cleaning mechanism. When the heating mechanism is started, the steel structure prefabricated parts pass through the heating mechanism. At this time, the current passes through the electromagnetic induction wire 302, and the steel structure prefabricated parts are heated by electromagnetic induction heating. The temperature sensor can monitor the temperature of the steel structure prefabricated parts to prevent the temperature from being too high. When the straightening mechanism is started, the first telescopic rod 402 expands and contracts to drive the centering rotating block 403 to move up and down. The centering rotating block 403 moves to drive the first connecting rod 404 to move. The first connecting rod 404 moves to drive the centering straightening plate 405 to move towards each other along the centering guide rod 406, so that the centering straightening rollers 407 clamp the steel structure prefabricated parts, such as to complete the automatic centering of the steel structure prefabricated parts. The fourth motor 408 rotates to drive the straightening screw 409 to rotate. The straightening screw 409 rotates to drive the vertical sliding block 415 and the other components thereon to move up and down. In this way, the vertical position of the straightening rollers 416 in the cross plate can be adjusted. The second telescopic rod 414 expands and contracts to drive the vertical rotating block 413 to move horizontally. The vertical rotating block 413 moves to drive the second connecting rod 412 to move. The second connecting rod 412 moves to drive the cross plate straightening frame 411 to move towards each other. The third telescopic rod 417 expands and contracts to drive the cross roller support frame 418 to move up and down so that the outer cross plate straightening rollers 419 contact the steel structure prefabricated parts. In this way, the outer cross plate straightening rollers 419 and the inner cross plate straightening rollers 416 can clamp the cross plate of the steel structure prefabricated parts. Through the setting of the straightening mechanism, the heated steel structure prefabricated parts can be straightened flat.
[0030] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.
Claims
1. A device for straightening prefabricated steel structures, comprising a conveying mechanism, characterized in that: A cleaning mechanism is arranged at the front side of the conveying mechanism, a heating mechanism is arranged at the middle part of the conveying mechanism, and a correction mechanism is arranged at the rear part of the conveying mechanism, wherein the correction mechanism comprises a correction bracket (401) fixedly connected to the conveying mechanism, a first telescopic rod (402) is fixedly connected to the lower side of the correction bracket (401), a centering rotating block (403) is fixedly connected to the output end of the first telescopic rod (402), both sides of the centering rotating block (403) are rotatably connected to symmetrically arranged first connecting rods (404), the other end of the first connecting rod (404) is rotatably connected to a centering correction plate (405), a symmetrically arranged centering guide rod (406) is fixedly connected to the correction bracket (401), the centering guide rod (406) is slidably connected to the centering correction plate (405), and one side of the centering correction plate (405) is rotatably connected to a centering correction roller (407).
2. A device for straightening a prefabricated steel structure according to claim 1, characterized in that: A symmetrically arranged fourth motor (408) is fixedly connected to the upper end of the correction bracket (401); a correction screw (409) is fixedly connected to the output end of the fourth motor (408); horizontal plate guide rods (410) are symmetrically arranged on both sides of the correction screw (409); the horizontal plate guide rods (410) are fixedly connected to the correction bracket (401); a vertical sliding block (415) is threadedly connected to the correction screw (409); a second telescopic rod (414) is fixedly connected to one side of the vertical sliding block (415); the other side of the vertical sliding block (415) is slidably connected to the correction bracket (401); a vertical rotating block (413) is fixedly connected to the output end of the second telescopic rod (414); the vertical rotating block (413) is fixedly connected to the output end of the second telescopic rod (414); ) are rotatably connected to symmetrically arranged second connecting rods (412) on both sides, the other end of the second connecting rod (412) is rotatably connected to a transverse plate correction frame (411), the transverse plate correction frame (411) is slidably connected to the transverse plate guide rod (410), the transverse plate correction frame (411) is slidably connected to the correction bracket (401), the other side of the transverse plate correction frame (411) is rotatably connected to a plurality of horizontally uniformly arranged transverse plate inner correction rollers (416), the top of the correction bracket (401) is fixedly connected to a third telescopic rod (417), the output end of the third telescopic rod (417) is fixedly connected to a transverse roller support frame (418), and the lower end of the transverse roller support frame (418) is rotatably connected to a plurality of horizontally uniformly arranged transverse plate outer correction rollers (419).
3. A straightening device for prefabricated steel structures according to claim 1, characterized in that: The conveying mechanism comprises a conveying bracket (101) fixedly connected to the correction bracket (401), a first motor (102) fixedly connected to the conveying bracket (101), a transmission roller (103) fixedly connected to the output end of the first motor (102), and the conveying bracket (101) is rotatably connected to the transmission roller (103).
4. A straightening device for prefabricated steel structures according to claim 3, characterized in that: The heating mechanism comprises a heating cylinder (301) fixedly connected to the conveying support (101), and an electromagnetic induction wire (302) with evenly arranged threads is fixedly connected to the inner wall of the heating cylinder (301).
5. The device for straightening a prefabricated steel structure according to claim 3, characterized in that: The cleaning mechanism comprises a cleaning bracket (201) fixedly connected to the conveying bracket (101); a second motor (202) is fixedly connected to one side of the cleaning bracket (201); a cleaning bidirectional screw (203) is fixedly connected to the output end of the second motor (202); threads of opposite rotation directions are arranged at both ends of the cleaning bidirectional screw (203); cleaning guide rods (204) are symmetrically arranged on both sides of the cleaning bidirectional screw (203); the cleaning guide rods (204) are fixedly connected to the cleaning bracket (201); symmetrically arranged side cleaning plates (205) are threadedly connected to the cleaning bidirectional screw (203); and one side of the side cleaning plate (205) is detachably connected to A side cleaning block (206); the upper end of the cleaning bracket (201) is fixedly connected to a third motor (207); the output end of the third motor (207) is fixedly connected to a driving gear (209); one side of the driving gear (209) is meshed with a driven gear (210); a cleaning vertical screw rod (208) is slidably connected to the cleaning bracket (201); the cleaning vertical screw rod (208) is threadedly connected to the driven gear (210); the lower end of the cleaning vertical screw rod (208) is fixedly connected to a top cleaning plate (211); a cleaning block is provided at the lower side of the top cleaning plate (211); and a cleaning vertical guide rod (212) is provided at one side of the cleaning vertical screw rod (208).
6. A device for straightening prefabricated steel structures according to claim 4, characterized in that: A temperature sensor is arranged on the rear side of the heating cylinder (301).
Citation Information
Patent Citations
Straightness correcting device for large steel structure prefabricated part
CN220427477U
Cited By
Straightening machine for aluminum alloy sections
CN120838886A