Automatic cutting-off device for steel bar head of prestressed electric pole

Abstract

The utility model discloses a prestressed electric pole steel bar head automatic cutting device which comprises an operation table, a linear module fixedly installed in the operation table, a flange plate fixedly installed at one end of a movable block of the linear module, a hydraulic rod fixedly installed at one end of the flange plate, and a prestressed electric pole steel bar head cutting mechanism fixedly installed on the outer surface of the hydraulic rod. A prestress detection mechanism is fixedly installed on the outer surface of a piston rod of the hydraulic rod and slides on the outer surface of the hydraulic rod. Through the design of the prestress detection mechanism and the prestress electric pole reinforcing steel bar head cutting mechanism, the cutting position and strength can be accurately controlled, the flatness and precision of the cut reinforcing steel bar head are ensured, the pretension force can be increased after the reinforcing steel bar head part is cut, the pretension force is transmitted into concrete through bonding, and the bearing capacity of the reinforcing steel bar head part is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, and particularly relates to an automatic cutting device for prestressed electric pole steel bar heads. Background Technique

[0002] Prestressed electric pole steel bars refer to steel bar cutting equipment used in prestressed concrete components. Such devices are usually used to automatically cut the steel bar head part after the steel bar tension reaches the design requirements to ensure the quality and safety of prestressed concrete components.

[0003] For example, the patent with the national authorization patent publication number CN220534533U discloses a prestressed electric pole steel bar tensioning platform, which includes a fixing mechanism, a tensioning mechanism and a moving mechanism. The tensioning mechanism is located below the fixing mechanism, and the moving mechanism is located below the tensioning mechanism. The tensioning mechanism includes a first base, a second base, a motor slot, a driving motor, a threaded rod, a threaded connection slot, a convex block, a cavity and a limiting block. The fixing seat of this prestressed electric pole steel bar tensioning platform initially fixes the steel bar, and the installation block fixes it secondly. The bolt passes through the screw groove and is threadedly connected to the fixing seat and the installation seat. The motor slot is arranged on the first base, the convex block is installed on the second base, the driving motor drives the threaded rod to rotate and then the convex block moves to change the distance between the first base and the second base. The limiting block prevents the threaded rod from coming out, and the connecting block connects the rigid support with the first base and the second base. The rigid support is used to fix the rotating shaft and the roller, and the rotating shaft drives the roller to roll, which is convenient and fast to use.

[0004] However, in the above-mentioned prestressed electric pole steel bar tensioning platform, during the process of pre-tensioning the steel bar, it does not have the function of automatically detecting and controlling the cutting position and force of the prestressed electric pole steel bar, and cannot ensure the flatness and accuracy of the steel bar head after cutting. Content of the Utility Model

[0005] The purpose of the utility model is to provide an automatic cutting device for prestressed electric pole steel bar heads to solve the problem that during the process of pre-tensioning the steel bar as mentioned in the above background technique, it does not have the function of automatically detecting and controlling the cutting position and force of the prestressed electric pole steel bar.

[0006] To achieve the above purpose, the utility model provides the following technical solution:

[0007] An automatic cutting device for prestressed electric pole steel bar heads includes: an operation table, a linear module is fixedly installed inside the operation table, one end of the moving block of the linear module is fixedly installed with a flange plate, one end of the flange plate is fixedly installed with a hydraulic rod, a prestressed electric pole steel bar head cutting mechanism is fixedly installed on the outer surface of the hydraulic rod, and a prestress detection mechanism is fixedly installed on the outer surface of the piston rod of the hydraulic rod, and the prestress detection mechanism slides on the outer surface of the hydraulic rod.

[0008] Preferably, the prestressed pole steel bar head cutting mechanism can be filled with steel bars and penetrate into it.

[0009] Preferably, a sleeve is fixedly installed on the outer surface of the hydraulic rod, and the sleeve limits the prestress detection mechanism therein.

[0010] Preferably, the prestressed pole steel bar head cutting mechanism includes a first cutting knife and an L-shaped plate. The L-shaped plate and the first cutting knife are respectively fixedly installed at one end of the piston rod of the sleeve and the hydraulic rod. A second cutting knife is fixedly installed at one end inside the L-shaped plate, and the first cutting knife is flush with the second cutting knife.

[0011] Preferably, a placement groove is formed on the upper surface of the L-shaped plate. The placement groove can be filled with steel bars and penetrate into it, so that the steel bars are located between the first cutting knife and the second cutting knife.

[0012] Preferably, the prestress detection mechanism includes a connection disk. The connection disk is fixedly installed on the outer surface of the piston rod of the hydraulic rod. Docking disks are fixedly installed at both ends of the connection disk. The docking disks are slidably attached to the outer surface of the hydraulic rod. A rotation groove is formed in the docking disk, and a rotation disk is rotatably installed in the rotation groove. A connection arm is fixedly installed on the outer surface of the rotation disk. One end of the connection arm is rotatably installed with a fitting plate, and a strain gauge type tension sensor is fixedly installed at one end of the fitting plate.

[0013] Preferably, the sensing end of the strain gauge type tension sensor penetrates through the fitting plate and is located in the arc groove of the fitting plate, so that it can be attached to the outer surface of the steel bar together with the fitting plate.

[0014] Preferably, docking grooves are formed on the upper and lower surfaces of the rotation disk. Rotation columns are fixedly installed in the docking grooves. The rotation disk is rotatably installed in the rotation groove through the rotation columns. A torsion spring is sleeved on the outer surface of the rotation column, and the upper and lower ends of the torsion spring are respectively fixedly connected between the rotation groove and the docking groove.

[0015] Preferably, the signal output end of the strain gauge type tension sensor is connected to the signal receiving end of the controller, and the hydraulic rod is controlled by the controller.

[0016] Preferably, the model of the strain gauge type tension sensor is GEFRAN.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] 1. Through the design of a linear module, a moving block, a hydraulic rod, a flange, a prestress detection mechanism, and a prestress electric pole steel bar head cutting mechanism, during use, the steel bar is pre-tensioned by a special device to generate a certain pre-tension force. The pre-tensioned steel bar passes through the prestress electric pole steel bar head cutting mechanism, and at the same time, the prestress detection mechanism on the outer surface of the hydraulic rod always adheres to the outer surface of the steel bar. As the steel bar is pre-tensioned, the resistance value in the prestress detection mechanism changes slightly with the force, enabling it to generate a small strain (i.e., deformation) on the steel bar surface as the steel bar is subjected to tension. These small strains cause the resistance value of the strain gauge to change. The resistance value of the strain gauge is proportional to the strain. Subsequently, the prestress detection mechanism can convert the electrical signal into the actual tension value through calibration. The calibration process is generally carried out with a known tension to establish the relationship between the electrical signal and the tension. Thus, the controller can read these electrical signals and convert the electrical signals into tension values through a pre-set algorithm. After the steel bar is pre-tensioned to the set value, a position truncation signal is sent to the prestress electric pole steel bar head cutting mechanism and the linear module by the controller, enabling the linear module to drive the prestress electric pole steel bar head cutting mechanism to move to the required truncation position of the steel bar for precise truncation. The truncation force of the prestress electric pole steel bar head cutting mechanism is also controlled by the controller to push the hydraulic rod for truncation, enabling it to truncate with a force adapted to the pre-tension of the steel bar, ensuring the flatness and precision of the steel bar head. After the steel bar tension reaches the design requirement and the steel bar head is partially truncated, the increased pre-tension can be transferred to the concrete through bonding, enhancing its bearing capacity.

[0019] 2. Through the design of the rotating disk, connecting arm, fitting plate, strain gauge type tension sensor, torsion spring, first cutting knife and second cutting knife, after the steel bar slides through the placement groove of the L-shaped plate, the docking disk fixedly installed on the outer surface of the push rod piston rod of the hydraulic rod can be started to slide towards one end, which can drive the fitting plates on both sides to press and fit on the outer surface of the steel bar. During the process of the fitting plate pressing on the outer surface of the steel bar, the rotating disk will be driven to rotate in the rotating groove through the connecting arm. The rotating disk will twist the torsion springs in the rotating groove and docking groove through the rotating columns on the upper and lower surfaces, and the torsion springs will apply a torsional elastic force to the connecting arm, which can enable the connecting arm to drive the fitting plate to press against the outer surface of the steel bar through the torsional elastic force, ensuring that the fitting plate drives the strain gauge type tension sensor to always fit on the outer surface of the steel bar. As the steel bar is pre-tensioned, the resistance value in the strain gauge type tension sensor will change slightly with the force, enabling it to generate a small strain (i.e., deformation) on the surface of the steel bar as the steel bar is subjected to tensile force. These small strains will cause the resistance value of the strain gauge to change, and the resistance value of the strain gauge is proportional to the strain. Subsequently, the strain gauge type tension sensor can convert the electrical signal into an actual tension value through calibration and calibration. The calibration process is generally carried out with a known tensile force to establish the relationship between the electrical signal and the tension. Furthermore, the controller can read these electrical signals and convert the electrical signals into tension values through a pre-set algorithm. After the steel bar is pre-tensioned to the set value, a position cutting signal will be sent to the hydraulic rod and linear module through the controller, enabling the linear module to drive the placement groove of the L-shaped plate to move on the outer surface of the steel bar until it moves to the required cutting position of the steel bar for precise cutting. And the cutting force during cutting is also controlled by the controller to push the first cutting knife to press against the outer surface of the steel bar, and the other side of the steel bar is pressed against one end of the second cutting knife for cutting, enabling it to cut with a force adapted to the pre-tension of the steel bar, ensuring the flatness and accuracy of the steel bar head. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the automatic cutting device for the steel bar head of the prestressed electric pole of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the steel bar head cutting mechanism of the present invention;

[0022] Figure 3 is a schematic diagram of the structures of the first cutting knife and the second cutting knife of the present invention;

[0023] Figure 4 is a schematic diagram of the structure of the prestress detection mechanism of the present invention.

[0024] In the figure: 1. Operating table; 101. Linear module; 102. Moving block; 2. Sleeve; 201. Hydraulic rod; 202. Flange; 3. Prestress detection mechanism; 301. Docking plate; 302. Connecting plate; 303. Rotating plate; 304. Connecting arm; 305. Fitting plate; 306. Strain gauge type tension sensor; 307. Rotating groove; 308. Rotating column; 309. Torsion spring; 310. Docking groove; 4. Prestressed electric pole steel bar head cutting mechanism; 401. L-shaped plate; 402. Second cutting knife; 403. Placing groove; 404. First cutting knife. Detailed implementation manners

[0025] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1 - 4 , the following technical solutions are provided in this embodiment:

[0027] As Figures 1 - 2 shown, an automatic cutting device for the steel bar head of a prestressed electric pole includes: an operating table 1, a linear module 101 is fixedly installed in the operating table 1, a flange 202 is fixedly installed at one end of the moving block 102 of the linear module 101, a hydraulic rod 201 is fixedly installed at one end of the flange 202, a prestressed electric pole steel bar head cutting mechanism 4 is fixedly installed on the outer surface of the hydraulic rod 201, and a prestress detection mechanism 3 is fixedly installed on the outer surface of the piston rod of the hydraulic rod 201, and the prestress detection mechanism 3 slides on the outer surface of the hydraulic rod 201.

[0028] The prestressed electric pole steel bar head cutting mechanism 4 can be filled with steel bars for insertion.

[0029] A sleeve 2 is fixedly installed on the outer surface of the hydraulic rod 201, and the sleeve 2 limits the prestress detection mechanism 3 therein.

[0030] Through the design of the linear module 101, the moving block 102, the hydraulic rod 201, the flange 202, the prestress detection mechanism 3 and the prestressed electric pole steel bar head cutting mechanism 4, during use, the steel bar is pre-tensioned by a special device to generate a certain pre-tension force, and the pre-tensioned steel bar will pass through the prestressed electric pole steel bar head cutting mechanism 4. At the same time, the prestress detection mechanism 3 on the outer surface of the hydraulic rod 201 will always be attached to the outer surface of the steel bar. During the process of pre-tensioning the steel bar, the resistance value in the prestress detection mechanism 3 will change slightly with the force, enabling it to generate a small strain (i.e., deformation) on the surface of the steel bar as the steel bar is subjected to tensile force. These small strains will cause the resistance value of the strain gauge to change, and the resistance value of the strain gauge is proportional to the strain. Subsequently, the prestress detection mechanism 3 can convert the electrical signal into the actual tension value through calibration. The calibration process is generally carried out with a known tensile force to establish the relationship between the electrical signal and the tension. Then, the controller can read these electrical signals and convert the electrical signals into tension values through a pre-set algorithm. After the steel bar is pre-tensioned to the set value, a position truncation signal will be sent to the prestressed electric pole steel bar head cutting mechanism 4 and the linear module 101 by the controller, enabling the linear module 101 to drive the prestressed electric pole steel bar head cutting mechanism 4 to move to the required truncation position of the steel bar for precise truncation. Moreover, the truncation force of the prestressed electric pole steel bar head cutting mechanism 4 is also controlled by the controller to push and truncate through the hydraulic rod 201, enabling it to truncate with an appropriate force according to the pre-tension force of the steel bar, ensuring the flatness and precision of the steel bar head. After the steel bar tension reaches the design requirement and the steel bar head is partially truncated, the increased pre-tension force can be transferred to the concrete through bonding, enhancing its bearing capacity.

[0031] As Figures 3 - 4 shown, the prestressed electric pole steel bar head cutting mechanism 4 includes a first cutting knife 404 and an L-shaped plate 401. The L-shaped plate 401 and the first cutting knife 404 are respectively fixedly installed at one end of the piston rod of the sleeve 2 and the hydraulic rod 201. A second cutting knife 402 is fixedly installed at the inner end of the L-shaped plate 401, and the first cutting knife 404 is flush with the second cutting knife 402.

[0032] A placement groove 403 is formed on the upper surface of the L-shaped plate 401. The placement groove 403 can be filled with and penetrated by the steel bar, so that it is located between the first cutting knife 404 and the second cutting knife 402.

[0033] The prestress detection mechanism 3 includes a connection disc 302 which is fixedly installed on the outer surface of the piston rod of the hydraulic rod 201. Docking discs 301 are fixedly installed at both ends of the connection disc 302. The docking discs 301 are slidably fitted to the outer surface of the hydraulic rod 201. A rotation groove 307 is formed in the docking disc 301. A rotating disc 303 is rotatably installed in the rotation groove 307. A connecting arm 304 is fixedly installed on the outer surface of the rotating disc 303. One end of the connecting arm 304 is rotatably installed with a fitting plate 305. A strain gauge type tension sensor 306 is fixedly installed at one end of the fitting plate 305.

[0034] The sensing end of the strain gauge type tension sensor 306 passes through the fitting plate 305 and is located in the arc groove of the fitting plate 305, so that it can be attached to the outer surface of the steel bar together with the fitting plate 305.

[0035] Docking grooves 310 are formed on both the upper and lower surfaces of the rotating disc 303. Rotating columns 308 are fixedly installed in the docking grooves 310. The rotating disc 303 is rotatably installed in the rotation groove 307 through the rotating columns 308. A torsion spring 309 is sleeved on the outer surface of the rotating column 308. The upper and lower ends of the torsion spring 309 are respectively fixedly connected between the rotation groove 307 and the docking groove 310.

[0036] The signal output end of the strain gauge type tension sensor 306 is connected to the signal receiving end of the controller, and the hydraulic rod 201 is controlled by the controller.

[0037] The model of the strain gauge type tension sensor 306 is GEFRAN.

[0038] Through the design of the rotating disc 303, the connecting arm 304, the fitting plate 305, the strain gauge type tension sensor 306, the torsion spring 309, the first cutting knife 404 and the second cutting knife 402, after the steel bar slides through the placement groove 403 of the L-shaped plate 401, the docking disc 301 fixedly installed on the outer surface of the push rod piston rod of the hydraulic rod 201 can be started to slide towards one end, which can drive the fitting plates 305 on both sides to press and fit on the outer surface of the steel bar. During the process of the fitting plate 305 pressing against the outer surface of the steel bar, the rotating disc 303 will be driven by the connecting arm 304 to rotate in the rotating groove 307. The rotating disc 303 will twist the torsion spring 309 in the rotating groove 307 and the docking groove 310 through the rotating columns 308 on the upper and lower surfaces. The torsion spring 309 will apply a torsional elastic force to the connecting arm 304, which can enable the connecting arm 304 to drive the fitting plate 305 to press against the outer surface of the steel bar through the torsional elastic force, ensuring that the fitting plate 305 drives the strain gauge type tension sensor 306 to always fit on the outer surface of the steel bar. During the pre-tensioning process of the steel bar, the resistance value in the strain gauge type tension sensor 306 will change slightly with the force. As the steel bar is subjected to tensile force, tiny strains (i.e., deformations) will occur on the surface of the steel bar. These tiny strains will cause the resistance value of the strain gauge to change. The resistance value of the strain gauge is proportional to the strain. Subsequently, the strain gauge type tension sensor 306 can convert the electrical signal into an actual tension value through calibration and calibration. The calibration process is generally carried out with a known tensile force to establish the relationship between the electrical signal and the tension. Then, the controller can read these electrical signals and convert the electrical signals into tension values through a pre-set algorithm. After the steel bar is pre-tensioned to the set value, a position cutting signal will be sent to the hydraulic rod 201 and the linear module 101 by the controller, enabling the linear module 101 to drive the placement groove 403 of the L-shaped plate 401 to move on the outer surface of the steel bar until it moves to the required cutting position of the steel bar for precise cutting. Moreover, the cutting force during cutting is also controlled by the controller to push the first cutting knife 404 to press against the outer surface of the steel bar, and the other side of the steel bar is pressed against one end of the second cutting knife 402 for cutting, enabling it to cut with a force adapted to the pre-tension of the steel bar and ensuring the flatness and precision of the steel bar head.

[0039] Summarize and sort out the working steps of this solution according to the above technical solution: When in use, the steel bar is pre-tensioned by a special device to generate a certain pre-tension force, and the pre-tensioned steel bar will slide through the placement groove 403 of the L-shaped plate 401. Subsequently, the docking plate 301 fixedly installed on the outer surface of the push rod piston rod of the hydraulic rod 201 can be started to slide towards one end, so that the docking plate 301 can drive the fitting plates 305 on both sides to press and fit on the outer surface of the steel bar. During the process of the fitting plate 305 pressing on the outer surface of the steel bar, the rotating disk 303 will be driven to rotate in the rotating groove 307 through the connecting arm 304. The rotating disk 303 will twist the torsion springs 309 in the rotating groove 307 and the docking groove 310 through the rotating columns 308 on the upper and lower surfaces, and the torsion springs 309 will apply a torsional elastic force to the connecting arm 304, enabling the connecting arm 304 to drive the fitting plate 305 to press against the outer surface of the steel bar through the torsional elastic force, ensuring that the fitting plate 305 drives the strain gauge type tension sensor 306 to always fit on the outer surface of the steel bar. As the steel bar is pre-tensioned, the resistance value in the strain gauge type tension sensor 306 will change slightly with the force, enabling it to generate a small strain (i.e., deformation) on the surface of the steel bar as the steel bar is subjected to tension. These small strains will cause the resistance value of the strain gauge to change, and the resistance value of the strain gauge is proportional to the strain. Subsequently, the strain gauge type tension sensor 306 can convert the electrical signal into an actual tension value through calibration and calibration. The calibration process is generally carried out with a known tension to establish the relationship between the electrical signal and the tension. Furthermore, the controller can read these electrical signals and convert the electrical signals into tension values through a pre-set algorithm. After the steel bar is pre-tensioned to the set value, a position truncation signal will be sent to the hydraulic rod 201 and the linear module 101 through the controller, enabling the linear module 101 to drive the placement groove 403 of the L-shaped plate 401 to move on the outer surface of the steel bar until it moves to the required truncation position of the steel bar for precise truncation. Moreover, the truncation force during truncation is also controlled by the controller to push the first truncation knife 404 to press against the outer surface of the steel bar through the hydraulic rod 201, and the other side of the steel bar is pressed against one end of the second truncation knife 402 for truncation, achieving the function of automatically truncating the steel bar head part.

[0040] In summary: It can accurately control the cutting position and force to ensure the flatness and precision of the steel bar head after cutting. After truncating the steel bar head part, the increased pre-tension force will be transferred to the concrete through bonding, enhancing its bearing capacity.

[0041] Parts not involved in the present utility model are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic cutting device for the steel bar heads of prestressed electric poles, characterized in that, Including: An operating table (1), a linear module (101) is fixedly installed inside the operating table (1), one end of a moving block (102) of the linear module (101) is fixedly installed with a flange plate (202), one end of the flange plate (202) is fixedly installed with a hydraulic rod (201), a prestressed electric pole steel bar head cutting mechanism (4) is fixedly installed on the outer surface of the hydraulic rod (201), and a prestress detection mechanism (3) is fixedly installed on the outer surface of the piston rod of the hydraulic rod (201), and the prestress detection mechanism (3) slides on the outer surface of the hydraulic rod (201).

2. The automatic cutting device for the prestressed pole steel bar head according to claim 1, wherein: The prestressed electric pole steel bar head cutting mechanism (4) can be filled and penetrated by steel bars.

3. The automatic cutting device for the prestressed pole steel bar head according to claim 1, characterized in that: A sleeve (2) is fixedly installed on the outer surface of the hydraulic rod (201), and the sleeve (2) limits the prestress detection mechanism (3) therein.

4. The automatic cutting device for the prestressed pole steel bar head according to claim 1, characterized in that: The prestressed electric pole steel bar head cutting mechanism (4) includes a first cutting knife (404) and an L-shaped plate (401), the L-shaped plate (401) and the first cutting knife (404) are respectively fixedly installed at one end of the sleeve (2) and the piston rod of the hydraulic rod (201), a second cutting knife (402) is fixedly installed at one end inside the L-shaped plate (401), and the first cutting knife (404) is flush with the second cutting knife (402).

5. The automatic cutting device for the prestressed electric pole steel bar head according to claim 4, characterized in that: A placement groove (403) is formed on the upper surface of the L-shaped plate (401), and the placement groove (403) can be filled and penetrated by steel bars so that the steel bars are located between the first cutting knife (404) and the second cutting knife (402).

6. The automatic cutting device for the prestressed pole steel bar head according to claim 1, wherein: The prestress detection mechanism (3) includes a connection disk (302), the connection disk (302) is fixedly installed on the outer surface of the piston rod of the hydraulic rod (201), docking disks (301) are fixedly installed at both ends of the connection disk (302), the docking disks (301) are slidably attached to the outer surface of the hydraulic rod (201), a rotation groove (307) is formed inside the docking disk (301), a rotating disk (303) is rotatably installed inside the rotation groove (307), a connecting arm (304) is fixedly installed on the outer surface of the rotating disk (303), a fitting plate (305) is rotatably installed at one end of the connecting arm (304), and a strain gauge type tension sensor (306) is fixedly installed at one end of the fitting plate (305).

7. An automatic cutting device for the steel bar head of a prestressed electric pole according to claim 6, characterized in that: The sensing end of the strain gauge type tension sensor (306) penetrates through the fitting plate (305) and is located in the arc groove of the fitting plate (305) so that it can be attached to the outer surface of the steel bar along with the fitting plate (305).

8. The automatic cutting device for the prestressed electric pole steel bar head according to claim 6, characterized in that: Docking grooves (310) are formed on the upper and lower surfaces of the rotating disk (303), rotating columns (308) are fixedly installed inside the docking grooves (310), the rotating disk (303) is rotatably installed inside the rotation groove (307) through the rotating columns (308), a torsion spring (309) is sleeved on the outer surface of the rotating columns (308), and the upper and lower ends of the torsion spring (309) are respectively fixedly connected between the rotation groove (307) and the docking grooves (310).

9. The automatic cutting device for the steel bar head of a prestressed electric pole according to claim 6, characterized in that: The signal output end of the strain gauge type tension sensor (306) is connected to the signal receiving end of the controller, and the hydraulic rod (201) is controlled by the controller.

10. An automatic cutting device for the steel bar heads of prestressed electric poles according to claim 9, characterized in that: The model of the strain gauge type tension sensor (306) is GEFRAN.

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