CN213749419U

CN213749419U - Repeated bending tester for reinforcing steel bars

Info

Publication number: CN213749419U
Application number: CN202022250442.5U
Authority: CN
Inventors: 刘增梅; 刘增玲; 胡梦飞; 薛玮; 孙家兴
Original assignee: Shandong Changwang Testing Technology Co ltd
Current assignee: Shandong Changwang Testing Technology Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-07-20
Anticipated expiration: 2030-10-09

Abstract

The application relates to the technical field of steel bar performance detection, and discloses a repeated bending testing machine for steel bars, which comprises a case, a working disc, a driving motor for driving the working disc to rotate, a pressure head, a bending core, a fixed rod, an extrusion rod, a telescopic mechanism and an anti-blocking mechanism, wherein the working disc is rotatably connected at one end of the case, which is far away from the ground, the driving motor is fixedly connected in the case, the bending core is coaxially detachably and fixedly connected at one end of the working disc, which is far away from the case, the telescopic mechanism is fixedly connected at one end of the case, the extrusion rod is abutted against one end of the working disc, which is far away from the case, one end of the extrusion rod is hinged with the telescopic end of the telescopic mechanism, one end of the extrusion rod, which is far away from the telescopic mechanism, is hinged with the fixed rod, which is fixedly connected at one end of the case, which is far away from the ground, a plurality of through holes for the pressure head to insert are arranged on the working disc, and a clamping space for clamping the steel bars is formed between the pressing rod and the bending core, this application has the effect that reduces because of the reinforcing bar is by the possibility of the rust jam through-hole that the bending dropped down.

Description

Repeated bending tester for reinforcing steel bars

Technical Field

The application relates to the field of reinforcing steel performance detection, in particular to a repeated bending tester for reinforcing steel bars.

Background

The steel bar bending tester is a special device for cold bending test and plane reverse bending test of steel bars, and is mainly applied to units such as engineering supervision, technical quality supervision, building construction industry, mechanical manufacturing industry and the like.

At present, the utility model discloses a chinese utility model patent of publication number CN209148452U, a reinforcing bar repeated bending test machine is disclosed, which comprises a bod, be provided with drive arrangement on the organism, drive arrangement is connected with decelerator, decelerator keeps away from drive arrangement's one end and is connected with and supports tight post, decelerator include with support tight post vertically rack and with rack toothing's gear, the organism surface is provided with the spout with rack sliding connection, the one end and the drive arrangement of rack are connected, rack and support and be provided with between the tight post and support tight post vertically short actuating arm, be provided with the push rod between short actuating arm and gear, the push rod include long section and with long section vertically short section, the one end and the gear sliding connection of short section are kept away from to the long section, the one end that the long section was kept away from to the short section is articulated with short actuating arm.

In the related art, because a lot of rust adheres to the surface of the steel bar, the rust on the surface of the steel bar falls off along with the bending of the steel bar, some rust falls into the blind hole for installing the pressure head, the pressure head may not be inserted into the blind hole after the rust accumulates for a long time, and the inventor thinks that the defect that the pressure head cannot be used normally due to the fact that the blind hole is blocked by the rust exists.

SUMMERY OF THE UTILITY MODEL

In order to reduce because of the crooked iron sheet bits that drop of reinforcing bar block up the possibility that the through-hole caused the unable normal use of pressure head, this application provides a reinforcing bar bending test machine repeatedly.

The application provides a pair of reinforcing bar repeated bending test machine adopts following technical scheme:

a repeated bending tester for reinforcing steel bars comprises a case, a working disc, a driving motor, a pressure head, a bending core, a fixed rod, an extrusion rod, a telescopic mechanism and a leakage-proof mechanism, wherein the working disc is rotatably connected at one end of the case, which is far away from the ground, the driving motor is fixedly connected in the case, a main shaft of the driving motor penetrates through the top wall of the case and is coaxially and fixedly connected with the working disc, the bending core is coaxially detachably and fixedly connected at one end of the working disc, which is far away from the case, the telescopic mechanism is fixedly connected at one end of the case, which is far away from the ground, the extrusion rod is positioned at one side of the working disc, which is far away from the case, one end of the extrusion rod is hinged with the telescopic end of the telescopic mechanism, one end of the extrusion rod, which is far away from the ground, is hinged with the fixed rod, the length direction of the fixed rod is parallel to the telescopic direction of the telescopic mechanism, and the working disc is provided with a plurality of through holes for inserting the pressure head, it is a plurality of through-hole circumference sets up on the terminal surface that quick-witted case was kept away from to the working disc, form the centre gripping space that is used for the centre gripping reinforcing bar between squeeze stem and the curved center, prevent leaking stoppage mechanism and include the subassembly that opens and shuts of carousel and a plurality of through-hole that is used for sealing, the carousel is connected with the coaxial rotation of curved center, the one end of quick-witted case is kept away from at the working disc to the carousel butt, the one end of working disc is kept away from at the squeeze stem butt, a plurality of waist type hole has been seted up on the carousel, and is a plurality of waist type hole corresponds with a through-hole respectively, the spout has been seted up on the lateral wall in waist type hole, the subassembly sliding connection that opens and shuts is in the spout.

Through adopting above-mentioned technical scheme, when using reinforcing bar bending test machine to carry out bending test to the reinforcing bar, place the reinforcing bar in the centre gripping space that forms between stripper bar and the curved center, insert the through-hole that corresponds with the one end of pressure head, then start telescopic machanism, make telescopic machanism's extension end drive the stripper bar, thereby make reinforcing bar and stripper bar and curved center butt, then start driving motor, make driving motor drive the working disc, make the reinforcing bar be crooked under the effect of pressure head simultaneously. After the pressure head inserted the through-hole, rotate the carousel and make the subassembly that opens and shuts will not have pressure head male through-hole to seal, avoid causing the unable normal use of pressure head because of the iron sheet bits that the reinforcing bar bending dropped blockked up the through-hole. The subassembly that opens and shuts of sliding connection in pressure head place waist type hole slides to the direction of keeping away from the pressure head under the promotion of pressure head, can not obstruct the rotation of carousel.

Optionally, the subassembly that opens and shuts includes the opening plate and is used for assisting the spring that the opening plate resets, opening plate sliding connection is in the spout, spring one end and opening plate fixed connection, the inner wall fixed connection of opening plate one end and waist type hole length direction one end is kept away from to the spring.

Through adopting above-mentioned technical scheme, utilize the open-close plate to seal the through-hole. Through the fixed connection spring between the inner wall at open-close plate and waist type hole length direction one end, make the pressure head follow the through-hole in take out the back open-close plate can be at automatic re-setting under the spring force effect, improve the convenience that the operator used, improve work efficiency.

Optionally, the lateral wall fixedly connected with of carousel has two stoppers of relative setting, threaded connection has fastening bolt on the stopper, fastening bolt is close to carousel one end and work dish butt.

Through adopting above-mentioned technical scheme, two stoppers of fixed connection on the lateral wall of carousel, threaded connection is at fastening bolt on the stopper, and the carousel rotates and seals the back to the through-hole, rotates fastening bolt and makes fastening bolt be close to carousel one end and working disc butt, makes carousel and working disc relatively fixed, avoids in the use carousel to take place the relative rotation with the working disc under the spring action of spring, influences the closed effect that can close the board.

Optionally, box fixedly connected with dust removal mechanism, dust removal mechanism includes dust collection box, dust absorption pipe and negative-pressure air fan, telescopic machanism's position is kept away from at the quick-witted roof portion to dust absorption pipe fixed connection, the opening of dust absorption pipe is towards the working disc, the one end intercommunication that quick-witted case was kept away from to the dust absorption pipe is on the lateral wall of dust collection box, negative-pressure air fan fixed connection is on the relative lateral wall of dust absorption pipe place lateral wall, negative-pressure air fan and dust collection box intercommunication.

Through adopting above-mentioned technical scheme, negative pressure fan work makes and gathers dust the incasement and form the negative pressure environment, and the dust absorption pipe that utilizes inhales the dust collection case with the iron sheet bits on the carousel, and iron sheet bits fall into the through-hole when avoiding changing the pressure head position and rotating the carousel, cause the jam of through-hole.

Optionally, a filter screen for filtering air in the dust collection box is arranged in the dust collection box, the filter screen is fixedly connected with the inner wall of the dust collection box, and the filter screen is perpendicular to the flowing direction of the air in the dust collection box.

Through adopting above-mentioned technical scheme, utilize the filter screen to filter the air through dust collecting box, stay the iron sheet bits in the filter screen and keep away from negative-pressure air fan's one side, avoid the iron sheet bits to discharge from negative-pressure air fan, cause the pollution to external environment.

Optionally, dust removal mechanism still includes the dust removal drawer, the dust removal drawer sets up between filter screen and dust absorption pipe, the one end of dust removal drawer penetrate in the dust collection box and with dust collection box sliding connection, the slip direction of dust removal drawer is perpendicular with the direction that the air flows in the dust collection box, the dust removal drawer is located the dust collection box and is close to base one end.

Through adopting above-mentioned technical scheme, the iron sheet bits of filter screen interception fall into the dust removal drawer, use a period back when dust removal mechanism, take out the dust removal drawer and clear up the inside iron sheet bits of dust collection box, and the clearance of dust collection box is very convenient.

Optionally, an access hole is formed in the side wall of the case, and a safety door for sealing the access hole is hinged to the inner wall of the case.

By adopting the technical scheme, the side wall of the case is provided with the access hole, so that a user can conveniently overhaul equipment in the case.

Optionally, one section of the chassis far away from the ground is hinged with a protective cover, and the protective cover is provided with an observation hole.

Through adopting above-mentioned technical scheme, when crooked the reinforcing bar, rotate suitable position with the protection casing, prevent to splash at reinforcing bar bending process and cause user's injury. The observation hole is formed in the surface of the protective cover, so that an operator can observe the bending condition of the reinforcing steel bar conveniently.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the bending core is coaxially and rotatably connected with a turntable, a plurality of kidney-shaped holes are formed in the turntable, the turntable is rotated after a pressure head is inserted into the through hole, and the through hole without the pressure head is sealed by an opening and closing assembly which is connected in the kidney-shaped holes in a sliding mode;

2. the dust removing mechanism is fixedly connected to one end, far away from the ground, of the machine case, the negative pressure fan works to form a negative pressure environment in the dust collecting box, and iron sheet scraps on the rotary disc are sucked into the dust collecting box through the dust collecting pipe, so that the phenomenon that the iron sheet scraps fall into the through hole to block the through hole when the rotary disc is rotated due to the replacement of the position of the pressure head is avoided;

3. through keeping away from the articulated protection casing of ground one end at the quick-witted case, when crooked to the reinforcing bar, rotate the protection casing to suitable position, prevent to splash at reinforcing bar bending process and cause user's injury.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic structural view of a portion of the working plate and the anti-clogging mechanism of the present embodiment;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

fig. 4 is a schematic structural view of a part of the dust removing mechanism of the present embodiment.

Description of reference numerals: 100. a chassis; 110. an access hole; 120. a safety door; 130. a protective cover; 131. an observation hole; 200. a working plate; 210. a pressure head; 220. bending the core; 230. a through hole; 300. a drive motor; 400. fixing the rod; 500. an extrusion stem; 600. a telescoping mechanism; 700. a leak stopping prevention mechanism; 710. a turntable; 711. a kidney-shaped hole; 712. a chute; 720. an opening and closing component; 721. opening and closing the board; 722. a spring; 800. a limiting block; 810. fastening a bolt; 900. a dust removal mechanism; 910. a dust collection box; 920. a dust collection pipe; 930. a negative pressure fan; 940. a filter screen; 950. dust removal drawer.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses reinforcing bar machine of bending repeatedly. Referring to fig. 1 and 2, the repeated bending tester for the steel bars comprises a case 100, wherein one end of the case 100, which is far away from the ground, is rotatably connected with a working disc 200, a driving motor 300 is fixedly connected in the case 100, and a spindle of the driving motor 300 penetrates through the top wall of the case 100 and is fixedly connected with the working disc 200. The end of the working plate 200 far away from the chassis 100 is connected with a bending core 220 in a threaded manner, and the bending core 220 and the working plate 200 are coaxially arranged. The case 100 is fixedly connected with a telescopic mechanism 600 and a fixing rod 400 at one end far away from the ground, the length direction of the fixing rod 400 is parallel to the telescopic direction of the telescopic mechanism 600, and the fixing rod 400 and the telescopic mechanism 600 are respectively located at two sides of the working plate 200. The telescopic end of the telescopic mechanism 600 is hinged with the extrusion rod 500, and one end of the extrusion rod 500 far away from the telescopic mechanism 600 is hinged with the fixed rod 400. The working disc 200 is provided with a plurality of through holes 230, the plurality of through holes 230 are circumferentially arranged on the end surface of the working disc 200 far away from the chassis 100, and the pressure head 210 is inserted into the through holes 230.

Referring to fig. 1 and 2, the bending core 220 is coaxially and rotatably connected with an anti-blocking mechanism 700 for preventing the through hole 230 from being blocked, the anti-blocking mechanism 700 is abutted to one end of the working disc 200 far away from the case 100, the extrusion rod 500 is abutted to the anti-blocking mechanism 700, and a clamping space for clamping a steel bar is formed between the extrusion rod 500 and the bending core 220. When using reinforcing bar bending test machine to carry out bending test to the reinforcing bar, place the reinforcing bar in the centre gripping space that forms between squeeze bar 500 and the curved center 220, insert corresponding through-hole 230 with the one end of pressure head 210 in, then start telescopic machanism 600, make telescopic machanism 600's extension end drive squeeze bar 500, thereby make reinforcing bar and squeeze bar 500 and curved center 220 butt, then at start-up driving motor 300, make driving motor 300 drive working disc 200, make the reinforcing bar be crooked under the effect of pressure head 210 simultaneously. One end of the case 100, which is far away from the ground, is fixedly connected with the dust removing mechanism 900, and the dust removing mechanism 900 is used for adsorbing iron scraps on the workbench, so that the iron scraps are prevented from falling into the through hole 230 when the turntable 710 is rotated due to the replacement of the position of the pressure head 210, and the blockage of the through hole 230 is avoided. A protective cover 130 is hinged to a section of the chassis 100 away from the ground, and an observation hole 131 is formed in the protective cover 130. When bending the reinforcing bar, rotate protection casing 130 to suitable position, prevent to splash and cause user's injury in the reinforcing bar process of buckling. The observation hole 131 is formed in the surface of the protective cover 130, so that an operator can observe the bending condition of the reinforcing steel bar conveniently.

Referring to fig. 2 and 3, the leakage prevention mechanism 700 includes a rotary plate 710, the rotary plate 710 is coaxially and rotatably connected to the bending core 220, and the rotary plate 710 abuts against an end of the working plate 200 away from the casing 100. The turntable 710 is provided with a plurality of waist-shaped holes 711, the waist-shaped holes 711 correspond to one through hole 230 respectively, and the pressure head 210 penetrates through the waist-shaped holes 711 and is inserted into the through hole 230. The side wall of the waist-shaped hole 711 is provided with a sliding groove 712, and the sliding groove 712 is internally connected with an opening and closing component for closing the through hole 230 in a sliding way. The opening and closing assembly comprises an opening and closing plate 721, the opening and closing plate 721 is connected in the sliding groove 712 in a sliding mode, a spring 722 is fixedly connected to the side wall of the opening and closing plate 721, and one end, far away from the opening and closing plate 721, of the spring 722 is fixedly connected with the inner wall of one end, in the length direction, of the waist-shaped hole 711. After the pressing head 210 is inserted into the through hole 230, the rotary disc 710 is rotated to seal the through hole 230 without the pressing head 210 inserted into the through hole 721, so that the pressing head 210 is prevented from being used normally due to the fact that iron scraps falling from the steel bars are bent to block the through hole 230. The opening plate 721 slidably connected in the waist-shaped hole 711 of the pressing head 210 slides in a direction away from the pressing head 210 under the pushing of the pressing head 210, and does not obstruct the rotation of the rotating disc 710. The spring 722 is fixedly connected between the opening plate 721 and the inner wall of one end of the waist-shaped hole 711 in the length direction, so that the opening plate 721 can automatically reset under the elastic force of the spring 722 after the pressure head 210 is taken out of the through hole 230, the use convenience of an operator is improved, and the working efficiency is improved.

Referring to fig. 2 and 3, two oppositely arranged limiting blocks 800 are fixedly connected to the side wall of the rotary plate 710, fastening bolts 810 are connected to the limiting blocks 800 in a threaded manner, and one end of each fastening bolt 810 close to the rotary plate 710 abuts against the working plate 200. After the rotary plate 710 rotates to seal the through hole 230, the fastening bolt 810 is rotated to enable one end, close to the rotary plate 710, of the fastening bolt 810 to abut against the working plate 200, so that the rotary plate 710 and the working plate 200 are relatively fixed, and the rotary plate 710 is prevented from rotating relative to the working plate 200 under the action of the elastic force of the spring 722 in the use process to influence the sealing effect of the plywood.

Referring to fig. 4, the dust removing mechanism 900 includes a dust collecting box 910, a dust collecting pipe 920 is communicated with a side wall of the dust collecting box 910, one end of the dust collecting pipe 920 far from the dust collecting box 910 is fixedly connected to a position far from the telescopic mechanism 600 (see fig. 1) on the top of the chassis 100 (see fig. 1), and an opening of the dust collecting pipe 920 faces the work tray 200 (see fig. 1). A negative pressure fan 930 is fixedly connected to the side wall opposite to the side wall where the dust suction pipe 920 is located, and the negative pressure fan 930 is communicated with the dust collection box 910. A filter screen 940 is fixedly connected in the dust collection box 910, and the filter screen 940 is perpendicular to the gas flowing direction in the dust collection box 910. The negative pressure fan 930 is used for manufacturing a negative pressure environment in the dust collection box 910, the negative pressure fan 930 sucks the iron scrap on the working disc 200 of the dust collection pipe 920 into the dust collection box 910, the filter screen 940 is used for filtering the air flowing through the dust collection box 910, the iron scrap is left on one side of the filter screen 940, which is far away from the negative pressure fan 930, and the iron scrap is prevented from being discharged from the negative pressure fan 930 to damage the external environment.

Referring to fig. 4, the dust removing mechanism 900 further includes a dust removing drawer 950, the dust removing drawer 950 is disposed between the filter screen 940 and the dust collecting pipe 920, one end of the dust removing drawer 950 penetrates into the dust collecting box 910 and is slidably connected with the dust collecting box 910 along a direction perpendicular to the air flowing direction in the dust collecting box 910, and the dust removing drawer 950 is located at one end of the dust collecting box 910 close to the ground. The iron sheet scraps intercepted by the filter screen 940 fall into the dust removal drawer 950, and after the dust removal mechanism 900 is used for a period of time, the dust removal drawer 950 is drawn out to clean the iron sheet scraps in the dust collection box 910, so that the dust collection box 910 is very convenient to clean.

The implementation principle of the reinforcing bar repeated bending tester in the embodiment of the application is as follows: when using reinforcing bar bending test machine to carry out bending test to the reinforcing bar, place the reinforcing bar in the centre gripping space that forms between squeeze bar 500 and the curved center 220, insert corresponding through-hole 230 with the one end of pressure head 210 in, then start telescopic machanism 600, make telescopic machanism 600's extension end drive squeeze bar 500, thereby make reinforcing bar and squeeze bar 500 and curved center 220 butt, then at start-up driving motor 300, make driving motor 300 drive working disc 200, make the reinforcing bar be crooked under the effect of pressure head 210 simultaneously.

After the pressing head 210 is inserted into the through hole 230, the rotary disc 710 is rotated to seal the through hole 230 without the pressing head 210 inserted into the through hole 721, so that the pressing head 210 is prevented from being used normally due to the fact that iron scraps falling from the steel bars are bent to block the through hole 230. The opening plate 721 slidably connected in the waist-shaped hole 711 of the pressing head 210 slides in a direction away from the pressing head 210 under the pushing of the pressing head 210, and does not obstruct the rotation of the rotating disc 710. The spring 722 is fixedly connected between the opening plate 721 and the inner wall of one end of the waist-shaped hole 711 in the length direction, so that the opening plate 721 can automatically reset under the elastic force of the spring 722 after the pressure head 210 is taken out of the through hole 230, the use convenience of an operator is improved, and the working efficiency is improved.

In the process of performing the bending test on the steel bar by the repeated bending test machine for the steel bar, the negative pressure fan 930 is kept started, the negative pressure fan 930 works to form a negative pressure environment in the dust collection box 910, and the iron scraps on the turntable 710 are sucked into the dust collection box 910 by the dust collection pipe 920, so that the iron scraps are prevented from falling into the through hole 230 when the turntable 710 is rotated by replacing the pressure head 210, and the blockage of the through hole 230 is avoided.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A repeated bending tester for steel bars is characterized in that: comprises a case (100), a working disc (200), a driving motor (300), a pressure head (210), a curved core (220), a fixing rod (400), an extrusion rod (500), a telescopic mechanism (600) and an anti-blocking leakage mechanism (700), wherein the working disc (200) is rotatably connected with one end of the case (100) far away from the ground, the driving motor (300) is fixedly connected in the case (100) and a main shaft of the driving motor (300) penetrates through the top wall of the case (100) and is coaxially and fixedly connected with the working disc (200), the curved core (220) is coaxially and detachably fixedly connected with one end of the working disc (200) far away from the case (100), the telescopic mechanism (600) is fixedly connected with one end of the case (100) far away from the ground, the extrusion rod (500) is positioned on one side of the working disc (200) far away from the case (100), one end of the extrusion rod (500) is hinged with the telescopic end of the telescopic mechanism (600), one end of the extrusion rod (500) far away from the telescopic mechanism (600) is hinged with the fixing rod (400), the fixing rod (400) is fixedly connected to one end, far away from the ground, of the case (100), the length direction of the fixing rod (400) is parallel to the telescopic direction of the telescopic mechanism (600), a plurality of through holes (230) for inserting the pressing head (210) are formed in the working disc (200), the through holes (230) are circumferentially formed in the end face, far away from the case (100), of the working disc (200), a clamping space for clamping reinforcing steel bars is formed between the extrusion rod (500) and the bending core (220), the anti-blocking mechanism (700) comprises a rotating disc (710) and a plurality of opening and closing assemblies for closing the through holes (230), the rotating disc (710) and the bending core (220) are coaxially and rotatably connected, the rotating disc (710) abuts against one end, far away from the case (100), of the extrusion rod (500) abuts against one end, far away from the working disc (200), of the rotating disc (710), and a plurality of kidney-shaped holes (711) are formed in the rotating disc (710), the plurality of waist-shaped holes (711) correspond to one through hole (230) respectively, sliding grooves (712) are formed in the side walls of the waist-shaped holes (711), and the opening and closing assembly is connected in the sliding grooves (712) in a sliding mode.

2. The repeated bending tester for reinforcing steel bars as claimed in claim 1, wherein: the subassembly that opens and shuts includes open-close plate (721) and spring (722) that are used for supplementary open-close plate (721) to reset, open-close plate (721) sliding connection is in spout (712), spring (722) one end and open-close plate (721) fixed connection, spring (722) are kept away from open-close plate (721) one end and waist type hole (711) length direction one end's inner wall fixed connection.

3. The repeated bending tester for reinforcing steel bars as claimed in claim 1, wherein: the lateral wall fixedly connected with of carousel (710) has two stopper (800) of relative setting, threaded connection has fastening bolt (810) on stopper (800), fastening bolt (810) are close to carousel (710) one end and work dish (200) butt.

4. The repeated bending tester for reinforcing steel bars as claimed in claim 1, wherein: case fixedly connected with dust removal mechanism (900), dust removal mechanism (900) is including dust collection box (910), dust absorption pipe (920) and negative pressure fan (930), the position of telescopic machanism (600) is kept away from at quick-witted case (100) top to dust absorption pipe (920) fixed connection, the opening of dust absorption pipe (920) is towards work dish (200), the one end intercommunication that quick-witted case (100) were kept away from in dust absorption pipe (920) is on the lateral wall of dust collection box (910), negative pressure fan (930) fixed connection is on the lateral wall that the lateral wall is relative at dust absorption pipe (920) place, negative pressure fan (930) and dust collection box (910) intercommunication.

5. The repeated bending tester for reinforcing steel bars as claimed in claim 4, wherein: a filter screen (940) used for filtering air in the dust collection box (910) is arranged in the dust collection box (910), the filter screen (940) is fixedly connected with the inner wall of the dust collection box (910), and the filter screen (940) is perpendicular to the flowing direction of the air in the dust collection box (910).

6. The repeated bending tester for reinforcing steel bars as claimed in claim 5, wherein: dust removal mechanism (900) still includes dust removal drawer (950), dust removal drawer (950) set up between filter screen (940) and dust absorption pipe (920), the one end of dust removal drawer (950) penetrate in dust collection box (910) and with dust collection box (910) sliding connection, the slip direction of dust removal drawer (950) is perpendicular with the direction of air flow in dust collection box (910), dust removal drawer (950) are located dust collection box (910) and are close to base one end.

7. The repeated bending tester for reinforcing steel bars as claimed in claim 1, wherein: an access hole (110) is formed in the side wall of the case (100), and a safety door (120) for sealing the access hole (110) is fixedly connected to the inner wall of the case (100).

8. The repeated bending tester for reinforcing steel bars as claimed in claim 1, wherein: one section of the case (100) far away from the ground is hinged with a protective cover (130), and an observation hole (131) is formed in the protective cover (130).