CN212216904U - A kind of steel bar straightening and cutting machine driven by hydraulic cylinder - Google Patents

Abstract

The utility model discloses a steel bar straightening and cutting machine driven and pressed by a hydraulic cylinder, comprising a horizontal straightening part, a traction part, a vertical straightening part, a straightening machine cutting mechanism and a straightening machine base. , The traction part, the vertical straightening part and the cutting mechanism of the straightening machine are all arranged on the base of the straightening machine. Using the hydraulic cylinder as the power, the piston push rod extended by the hydraulic cylinder pushes the slider with the straightening roller bearing, and the up and down movement of the slider is controlled by the extension cylinder and the pull-back cylinder set up by the hydraulic cylinder to control the up and down movement of the slider. To measure the distance that the piston rod moves, that is, the amount of movement of the straightening roller. This will effectively control the accuracy of the reduction amount, while ensuring the straightening accuracy, it will also make the force of each straightening roller more rational to a certain extent and improve the service life of the straightening roller.

Description

A kind of steel bar straightening and cutting machine driven by hydraulic cylinder

technical field

The utility model relates to the technical field of machinery, in particular to a steel bar straightening and cutting machine driven and pressed by a hydraulic cylinder.

Background technique

As one of the most basic materials in the construction industry, with the rapid development of domestic infrastructure construction, the demand for steel bars is increasing day by day, and the amount of application is huge. However, due to the influence of various factors during the rolling, cooling and transportation of steel bars, various shape defects often occur, such as arc bending. In order to eliminate these bending and make steel bars have the best mechanical properties in engineering applications, it is necessary to The rebar needs to be straightened. As an important process parameter in the straightening process, the reduction must ensure accuracy. In the same straightening system, a slight adjustment of the reduction amount will affect the straightening effect of the entire steel bar. At this stage, under normal circumstances, the adjustment of the amount of reduction during straightening often relies on the experience of workers to perform manual operations. This adjustment method has no theoretical basis and the straightening effect is unstable. Therefore, the method of obtaining a reasonable reduction amount through theoretical calculation and then adjusting the reduction amount of the straightening roller through hydraulic equipment is more and more recognized by the public. It not only improves the automation degree of the straightening machine, but also improves the straightening precision and processing efficiency.

Utility model content

The purpose of this utility model is to provide a kind of steel bar straightening and cutting machine driven and depressed by a hydraulic cylinder, and the specific technical method is to solve the above-mentioned technical problems, and the scheme is as follows:

A steel bar straightening and cutting machine driven and pressed by a hydraulic cylinder, comprising a horizontal straightening part, a pulling part, a vertical straightening part, a straightening machine cutting mechanism and a straightening machine base, the horizontal straightening part, the pulling part, the longitudinal The straightening part and the cutting mechanism of the straightening machine are all arranged on the base of the straightening machine.

Said kind of steel bar straightening and cutting machine driven and pressed down by a hydraulic cylinder, the preferred solution is that the lateral straightening part includes a guide sleeve a, a straightening roller a, a straightening roller bearing a, a bottom plate of the lateral straightening part, a pre- Leave threaded holes for fixing the bottom plate and a pressing device driven by a hydraulic cylinder;

The straightening roller a is connected to the bottom plate of the horizontal straightening part through bearings, the guide sleeve a is fixed on the bottom plate of the horizontal straightening part by welding, and the center of the guide sleeve a and the center of the groove of the straightening roller a are kept on the same horizontal line. , the pressing device driven by the hydraulic cylinder is fastened on the bottom plate of the lateral straightening part by means of screw connection.

The preferred solution of the hydraulic cylinder-driven and depressed steel bar straightening and cutting machine is that the traction part includes a traction box, a hydraulic cylinder-driven depression device, a sleeve, a traction wheel, a traction wheel bearing and a guide sleeve b. ;

The traction wheel is installed on the traction box with the sleeve through the traction wheel bearing. The traction box is divided into upper and lower parts and assembled by bolting. The hydraulic cylinder-driven pressing device is fastened to the traction box by screwing. On the box body, the guide sleeve b on the traction box is fixed at the center position of the two sets of traction wheels by welding, and the guide sleeve b of the traction part should maintain a concentric positional relationship with the guide sleeve a of the straightening part.

The preferred solution of the steel bar straightening and cutting machine driven by a hydraulic cylinder is that the longitudinal straightening part includes a hydraulic cylinder-driven pressing device, a straightening roller bearing b, a straightening roller b, and a guide sleeve c. , Reserve threaded holes for fixing the bottom plate, and longitudinally straighten part of the bottom plate;

The straightening roller b is connected to the bottom plate of the longitudinal straightening part through the straightening roller bearing b, the guide sleeve c is fixed on the bottom plate of the longitudinal straightening part by welding, and the center of the guide sleeve c and the center of the groove of the straightening roller b are kept at the same position. On the same horizontal line, the pressing device driven by the hydraulic cylinder is fastened on the bottom plate of the longitudinal straightening part by means of screw connection.

Said kind of steel bar straightening and cutting machine driven and depressed by a hydraulic cylinder, its preferred solution is that the cutting mechanism of the straightening machine comprises a servo motor, a cutting support arm, a hydraulic cylinder output shaft, a cutting arm, a pin shaft a and a cutting part base;

The servo motor is mounted on the base of the cutting part, the output shaft of the hydraulic cylinder is connected with the cutting arm by means of screw connection, and the cutting arm is connected with the cutting arm by cooperating with the pin shaft a, and transmits the power of the motor. to cut off the arm;

The preferred solution of the hydraulic cylinder-driven steel bar straightening and cutting machine is that the hydraulic cylinder-driven pressing device includes a hydraulic cylinder, a hydraulic cylinder boss, a countersunk screw hole, a hydraulic cylinder extending piston, and a hydraulic cylinder. It is composed of a pull-back piston, a pin shaft b, a slider, a straightening roller c, and a straightening roller bearing c;

The hydraulic cylinder is fixed on each bottom frame by means of bolt connection through the threaded holes reserved in the boss; the hydraulic cylinder pulls back the piston and the slider are connected by the pin shaft b. During the adjustment of the reduction amount, the hydraulic cylinder extends The piston extends outward with the oil supply in the upper chamber of the cylinder, and its top end contacts the slider to realize the pressing of the straightening roller c. During this process, the pull-back chamber of the hydraulic cylinder is not supplied with oil and is in a relaxed state. It only plays the role of connecting the slider; when the straightening roller c needs to be lifted after the system is straightened, the lower chamber of the pull-back cylinder is fed with oil and the extension cylinder is in a relaxed state, and the straightening roller c is connected. The slider is lifted to realize the lifting of the straightening roller c.

The preferred solution of the steel bar straightening and cutting machine driven and depressed by a hydraulic cylinder is that the centers of the upper and lower traction wheels in the traction part are on the same vertical line.

The hydraulic cylinder is provided with two extension cylinders and a pull-back cylinder, and each hydraulic cylinder has its own closed circuit, which connects the pull-back cylinder and the pin shaft of the slider, and the slider with the straightening roller bearing is installed to straighten the cylinder. Roll and roll bearing composition. During the straightening process of the steel bar, the distance between the two rows of straightening rollers at the corresponding position of the hydraulic cylinder of each adjustable straightening roller is detected in real time by the linear displacement sensor, which is the value of the position where the distance of the adjustable roller is zero and the pressing amount is zero. the size of. When the system issues a pressing command, the extending cylinder chambers on both sides of the hydraulic cylinder are filled with oil, so that the piston push rod is elongated. Specific description: The piston push rod extending out of the hydraulic cylinder on both sides selects a three-position four-way O-type electro-hydraulic servo valve to control one end of its piston rod. The servo control valve uses a large-flow pump to supply oil to the upper chamber of the hydraulic cylinder, which will rapidly increase the pressure in the upper chamber of the hydraulic cylinder. It will move down quickly, and the reduction of the adjustable roller will increase accordingly. In order to make the reduction amount reach the accurate theoretical value, the servo valve will be unloaded when the theoretical value is about to be reached, and a small flow pump is used to supply oil to the lower chamber extending out of the hydraulic cylinder, at this time, the pressure of the upper chamber of the hydraulic cylinder will be caused. If it is reduced, the downward movement speed of the driving push rod of the straightening roller will become slow, and the value of the theoretically calculated reduction will be stopped and maintained. There is no pressure oil in the pull-back cylinder chamber during the above period, because the pull-back cylinder is connected with the slider equipped with the straightening roller through the pin shaft, so the pull-back cylinder also extends along with it. When the push-rod of the pull-out cylinder is fixed, it means that Determination of the pressing amount is the adjustment action of the entire pressing amount.

In order to accurately control the amount of pressure during pressing, the position sensor is essential. The displacement sensor is built in the hydraulic cylinder to convert the measured position amount into the current amount and input it to the A/D module of the PLC. The position value detected by the sensor is compared with the position value set by the theoretical calculation. The PLC will calculate the corresponding control quantity through their difference and adopt the appropriate control strategy, and then make the control quantity output the control voltage through the D/A module, and then convert it into the form of current after being amplified by the amplifier and input it to the proportional servo valve, In this way, the flow rate of the proportional servo valve is controlled, and the result of making the position of the hydraulic cylinder consistent with the set value is finally obtained. Furthermore, in order to ensure the vertical depression of the straightening rollers, the hydraulic cylinders on both sides must be moved synchronously in all cases. This is done by monitoring the difference between the extension of the cylinder (in relation to the set position) and feeding this signal back to the base position control loop. When the processing is completed or the reduction amount needs to be reduced, oil is fed into the lower chamber of the pull-back cylinder so that the straightening roller equipped with the slider is lifted up.

Beneficial effects of the present utility model: The new straightening machine provided by the present utility model has the advantage of manually adjusting the reduction amount by relying on manual labor and experience, compared with the traditional one, this device can calculate the reduction amount according to the specific material and model of the processed steel bar. Afterwards, the automatic adjustment of the pressing amount is carried out according to the required amount through the position sensor, and the adjustment process is more accurate, rapid and stable. This device is more suitable for fast and mass production under working conditions. It can significantly reduce the time for workers to wait for adjustment when adjusting the pressing amount and stop, and can also effectively reduce a series of problems such as errors caused by manual adjustment by workers based on experience. This device can precisely control the amount of reduction. The piston push rod extended from the hydraulic cylinder pushes the slider equipped with the straightening roller bearing, and the expansion and contraction of the piston rod is controlled by changing the oil in and out of the extension cylinder and the pull-back cylinder, and the piston rod is measured by the displacement sensor. The moving distance is the moving distance of the straightening roller. In order to ensure the stability of the entire pressing process, it is necessary to feed back the displacement information of the extension cylinders on both sides, and coordinate the displacement and speed of the two extension cylinders by controlling the flow rate of the servo valves on both sides, so that the two can maintain a height. Consistent. According to the type and bending degree of the currently processed steel bar, the reduction amount is calculated by the elastic-plastic theory of metal. The value of this series of reduction amount is calculated on the premise of ensuring the minimum overall force of the straightening roller of the straightening machine. It can maximize the service life of the straightening machine by accurately reducing the amount. Reduce the frequency of use of unreasonable loads, reduce the non-uniformity of the bearing of the straightening roller, reduce the risk of shaft breakage of the straightening roller, and improve the service life of the straightening machine.

Description of drawings

Fig. 1 is the general assembly drawing of the hydraulic cylinder driving and pressing down the steel bar straightening and cutting machine;

Figure 2 is a three-dimensional view of the horizontal straightening part of the hydraulic cylinder-driven and depressed steel bar straightening machine;

Figure 3 is a three-dimensional view of the traction part of the hydraulic cylinder-driven and depressed steel bar straightening machine;

Figure 4 is a three-dimensional view of the longitudinal straightening part of the hydraulic cylinder-driven and depressed steel bar straightening machine;

Figure 5 is a three-dimensional view of the cutting part of the hydraulic cylinder-driven and depressed steel bar straightening machine;

Figure 6 is a three-dimensional view of a hydraulic cylinder-driven pressing device;

FIG. 7 is a schematic diagram of the principle of the hydraulic cylinder-driven pressing device.

In the figure, 1 horizontal straightening part, 2 straightening machine base, 3 traction part, 4 hydraulic cylinder-driven pressing device, 5, vertical straightening part, 5 straightening machine cutting part, 7 guide sleeve a, 8 straightening Roller bearing a, 9 straightening roller a, 10 bottom plate of horizontal straightening part, 11 reserved threaded hole for fixing bottom plate, 12 traction box, 13 sleeve, 14 traction wheel, 15 traction wheel bearing, 16 guide sleeve b, 17 adjustment Straight roller bearing b, 18 straightening roller b, 19 guide sleeve c, 20 reserved threaded holes for fixing base plate, 21 longitudinal straightening part base plate, 22 servo motor, 23 cutting arm, 24 hydraulic cylinder output shaft, 25 cutting arm , 26 pin a, 27 cut off part of the base, 28 hydraulic cylinder, 29 hydraulic cylinder boss, 30 countersunk head screw hole, 31 hydraulic cylinder extending the piston, 32 hydraulic cylinder will pull the piston, 33 pin shaft b, 34 slider, 35 straightening roller c, 36 straightening roller bearing c.

Detailed ways

The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are 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 work shall fall within the protection scope of the present invention.

A steel bar straightening and cutting machine driven and pressed by a hydraulic cylinder, comprising a horizontal straightening part 1, a traction part 2, a vertical straightening part 3, a straightening machine cutting mechanism 5 and a straightening machine base 6, the horizontal straightening part 1. The traction part 2, the vertical straightening part 3, and the cutting mechanism 5 of the straightening machine are all arranged on the base 6 of the straightening machine.

The lateral straightening part 1 includes a guide sleeve a7, a straightening roller a8, a straightening roller bearing a9, a bottom plate 10 of the lateral straightening part, a threaded hole 11 reserved for fixing the bottom plate and a hydraulic cylinder-driven pressing device 4;

The straightening roller a8 is connected to the bottom plate 10 of the horizontal straightening part through a bearing, the guide sleeve a7 is fixed on the bottom plate 10 of the horizontal straightening part by welding, and the center of the guide sleeve a7 and the center of the groove of the straightening roller a8 are kept at the same level. In a straight line, the pressing device 4 driven by the hydraulic cylinder is fastened on the bottom plate 10 of the lateral straightening part by means of screw connection.

The traction part 2 includes a traction box 12, a hydraulic cylinder-driven pressing device 4, a sleeve 13, a traction wheel 14, a traction wheel bearing 15 and a guide sleeve b16;

The traction wheel 14 is mounted on the traction box 12 with the sleeve 13 through the traction wheel bearing 15. The traction box 12 is divided into upper and lower parts and assembled by bolts. The hydraulic cylinder-driven pressing device 4 is connected by screws. It is fastened on the box body of the traction box 12 in a way, and the guide sleeve b16 on the traction box 12 is fixed at the center position of the two sets of traction wheels 14 by welding. The guide bush a7 maintains a concentric positional relationship.

The longitudinal straightening part 5 comprises a hydraulic cylinder-driven pressing device 4, a straightening roller bearing b17, a straightening roller b18, a guide sleeve c19, a threaded hole 20 reserved for fixing the bottom plate, and a bottom plate 21 of the longitudinal straightening part;

The straightening roller b18 is connected to the bottom plate 21 of the longitudinal straightening part through the straightening roller bearing b17, the guide sleeve c19 is fixed on the bottom plate 21 of the longitudinal straightening part by welding, and the center of the guide sleeve c19 is the center of the groove of the straightening roller b18. Keeping on the same horizontal line, the pressing device 4 driven by the hydraulic cylinder is fastened on the bottom plate 21 of the longitudinal straightening part by means of screw connection.

The straightening machine cutting mechanism 5 includes a servo motor 22, a cutting support arm 23, a hydraulic cylinder output shaft 24, a cutting arm 25, a pin shaft a26 and a cutting part base 27;

The servo motor 22 is mounted on the cutting part base 27, the hydraulic cylinder output shaft 24 is connected with the cutting arm 25 by means of screw connection, and the cutting arm 25 is connected with the cutting arm 25 by cooperating with the pin shaft a26, and is connected to the cutting arm 25. The motor power is transmitted to the cutting arm 25;

The hydraulic cylinder-driven pressing device 4 includes a hydraulic cylinder 28, a hydraulic cylinder boss 29, a countersunk head screw hole 30, a hydraulic cylinder extending piston 31, a hydraulic cylinder pulling back piston 32, a pin shaft b33, a slider 34, and a straightening roller c35, straightening roller bearing c36 composition;

The hydraulic cylinder 28 is fixed on each bottom frame by means of bolt connection through the threaded holes reserved by the hydraulic cylinder boss 29; In the middle, the extension piston 31 of the hydraulic cylinder extends outward along with the oil supply in the upper chamber of the extension cylinder, and the top end contacts the slider 34 to realize the pressing of the straightening roller c35, and the pullback chamber of the hydraulic cylinder is in this process. The oil is not supplied in the middle and is in a relaxed state, which only plays the role of connecting the slider; when the straightening roller needs to be lifted after the system is straightened, the lower chamber of the pull-back cylinder is fed with oil and the extension cylinder is in a relaxed state. The slider 34 connected with the straightening roller c35 is lifted up to realize the lifting of the straightening roller c35.

The centers of the upper and lower traction wheels 14 in the traction part 3 are on the same vertical line.

The hydraulic cylinder is provided with two extension cylinders and a pull-back cylinder, and each hydraulic cylinder has its own closed circuit, which connects the pull-back cylinder and the pin shaft of the slider, and the slider with the straightening roller bearing is installed to straighten the cylinder. Roll and roll bearing composition. During the straightening process of the steel bar, the distance between the two rows of straightening rollers at the corresponding position of the hydraulic cylinder of each adjustable straightening roller is detected in real time by the linear displacement sensor, that is, the value of the position where the distance of the adjustable roller is measured is zero. the size of. When the system sends a pressing command, the extending cylinder chambers on both sides of the hydraulic cylinder are filled with oil, so that the piston push rod is elongated. Specific description: The piston push rod extending out of the hydraulic cylinder on both sides selects a three-position four-way O-type electro-hydraulic servo valve to control one end of its piston rod. The servo control valve uses a large-flow pump to supply oil to the upper chamber of the hydraulic cylinder, which will rapidly increase the pressure in the upper chamber of the hydraulic cylinder. It will move down quickly, and the reduction of the adjustable roller will increase accordingly. In order to make the reduction amount reach the accurate theoretical value, the servo valve will be unloaded when the theoretical value is about to be reached, and a small flow pump is used to supply oil to the lower chamber extending out of the hydraulic cylinder. At this time, the pressure of the upper chamber of the hydraulic cylinder will be caused. If it is reduced, the downward movement speed of the driving push rod of the straightening roller will become slow, and the value of the theoretically calculated reduction will be stopped and maintained. There is no pressure oil in the pull-back cylinder chamber during the above period because the pull-back cylinder is connected with the slider equipped with the straightening roller through the pin shaft, so the pull-back cylinder also extends along with it. When the push-rod of the pull-out cylinder is fixed, it means that Determination of the pressing amount is the adjustment action of the entire pressing amount.

In order to accurately control the amount of pressure during pressing, the position sensor is essential. The displacement sensor is built in the hydraulic cylinder to convert the measured position amount into the current amount and input it to the A/D module of the PLC. The position value detected by the sensor is compared with the position value set by the theoretical calculation. The PLC will calculate the corresponding control quantity through their difference and adopt the appropriate control strategy, and then make the control quantity output the control voltage through the D/A module, and then convert it into the form of current after being amplified by the amplifier and input it to the proportional servo valve, In this way, the flow rate of the proportional servo valve is controlled, and the result of making the position of the hydraulic cylinder consistent with the set value is finally obtained. Furthermore, in order to ensure the vertical depression of the straightening rollers, the hydraulic cylinders on both sides must be moved synchronously in all cases. This is done by monitoring the difference between the extension of the cylinder (in relation to the set position) and feeding this signal back to the base position control loop. When the processing is completed or the reduction amount needs to be reduced, oil is fed into the lower chamber of the pull-back cylinder so that the straightening roller equipped with the slider is lifted up.

Claims (7)

1. A steel bar straightening and cutting machine driven by a hydraulic cylinder is characterized in that: comprising a horizontal straightening part, a traction part, a vertical straightening part, a straightening machine cutting mechanism and a straightening machine base, the horizontal straightening part; The part, the pulling part, the vertical straightening part and the cutting mechanism of the straightening machine are all arranged on the base of the straightening machine. 2. The steel bar straightening and cutting machine driven by a hydraulic cylinder according to claim 1, characterized in that: the lateral straightening part comprises a guide sleeve a, a straightening roller a, a straightening roller bearing a, a lateral Straightening part of the bottom plate, reserved threaded holes for fixing the bottom plate and pressing device driven by hydraulic cylinder; The straightening roller a is connected to the bottom plate of the horizontal straightening part through bearings, the guide sleeve a is fixed on the bottom plate of the horizontal straightening part by welding, and the center of the guide sleeve a and the center of the groove of the straightening roller a are kept on the same horizontal line. , the pressing device driven by the hydraulic cylinder is fastened on the bottom plate of the lateral straightening part by means of screw connection. 3. The steel bar straightening and cutting machine driven by a hydraulic cylinder according to claim 1, wherein the traction part comprises a traction box, a hydraulic cylinder-driven depression device, a sleeve, a traction wheel, a traction Wheel bearing and guide bush b; The traction wheel is installed on the traction box with the sleeve through the traction wheel bearing. The traction box is divided into upper and lower parts and assembled by bolting. The hydraulic cylinder-driven pressing device is fastened to the traction box by screwing. On the box body, the guide sleeve b on the traction box is fixed at the center position of the two sets of traction wheels by welding, and the guide sleeve b of the traction part should maintain a concentric positional relationship with the guide sleeve a of the straightening part. 4. The steel bar straightening and cutting machine driven by a hydraulic cylinder according to claim 1, wherein the longitudinal straightening part comprises a hydraulic cylinder-driven pressing device, a straightening roller bearing b, a straightening Roller b, guide sleeve c, reserved threaded holes for fixing the bottom plate, longitudinal straightening part of the bottom plate; The straightening roller b is connected to the bottom plate of the longitudinal straightening part through the straightening roller bearing b, the guide sleeve c is fixed on the bottom plate of the longitudinal straightening part by welding, and the center of the guide sleeve c and the center of the groove of the straightening roller b are kept at the same position. On the same horizontal line, the pressing device driven by the hydraulic cylinder is fastened on the bottom plate of the longitudinal straightening part by means of screw connection. 5. The steel bar straightening and cutting machine driven and depressed by a hydraulic cylinder according to claim 1, wherein the cutting mechanism of the straightening machine comprises a servo motor, a cutting arm, a hydraulic cylinder output shaft, a cutting arm, a pin shaft a and cut off part of the base; The servo motor is mounted on the base of the cutting part, the output shaft of the hydraulic cylinder is connected with the cutting arm by means of screw connection, and the cutting arm is connected with the cutting arm by cooperating with the pin shaft a, and transmits the power of the motor. Give the cut-off arm. 6. The steel bar straightening and cutting machine driven by a hydraulic cylinder according to claim 1, wherein the pressing device driven by the hydraulic cylinder comprises a hydraulic cylinder, a hydraulic cylinder boss, a countersunk screw hole, a hydraulic cylinder It consists of extending piston, hydraulic cylinder pulling back piston, pin shaft b, sliding block, straightening roller c and straightening roller bearing c; The hydraulic cylinder is fixed on each bottom frame by means of bolt connection through the threaded holes reserved in the boss; the hydraulic cylinder pulls back the piston and the slider are connected by the pin shaft b. During the adjustment of the reduction amount, the hydraulic cylinder extends The piston extends outward with the oil supply in the upper chamber of the cylinder, and its top end contacts the slider to realize the pressing of the straightening roller c. During this process, the pull-back chamber of the hydraulic cylinder is not supplied with oil and is in a relaxed state. It only plays the role of connecting the slider; when the straightening roller c needs to be lifted after the system is straightened, the lower chamber of the pull-back cylinder is fed with oil and the extension cylinder is in a relaxed state, and the straightening roller c is connected. The slider is lifted to realize the lifting of the straightening roller c. 7 . The steel bar straightening and cutting machine driven and depressed by a hydraulic cylinder according to claim 3 , wherein the centers of the upper and lower traction wheels in the traction part are on the same vertical line. 8 .

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