A five-head pure hydraulic stirrup bender

Abstract

The present invention discloses a five-head pure hydraulic hoop bending machine, comprising a machine base, five heads, a first oil supply mechanism and a second oil supply mechanism; the five heads are arranged side by side in sequence and can be movably connected to the machine base; a clamping mechanism is provided under each head, the clamping mechanism comprises a clamping oil cylinder, and the output end of the clamping oil cylinder limits the movement of the head when it is extended to abut against the machine base; the head comprises a hoop bending mechanism, and the hoop bending mechanism comprises an elbow disk, an elbow shaft, a core shaft, a telescopic oil cylinder, a gear shaft, and a bending oil cylinder; the elbow shaft is eccentrically arranged at the elbow disk; the core shaft passes through the center of the elbow disk until the head end of the core shaft is opposite to the elbow shaft; the telescopic oil cylinder drives the core shaft to extend and retract relative to the elbow disk; the gear shaft sleeve is arranged at the tail end of the core shaft, and the end of the gear shaft is connected to the elbow disk; the output end of the bending oil cylinder is provided with a first rack, which is meshed with the teeth of the gear shaft. The whole machine adopts hydraulic drive, so the present invention has the advantages of simple structure, low failure rate, convenient locking and good effect.

Description

Technical Field

[0001] The present invention relates to the field of steel bar processing equipment, in particular to a five-head pure hydraulic hoop bending machine. Background Art

[0002] Most of the current five-head hoop bending machines use a hybrid power of hydraulic and pneumatic, with a complex structure and a high failure rate; the positioning of the head adopts a manual mechanical locking device, which is complicated to operate and has poor positioning effect; the bending angle of the hoop bending machine is controlled by a positioning trigger switch, and the angle adjustment gear is fixed, and it is impossible to obtain more different bending angles. Moreover, the adjustment is completed manually, and some use built-in encoders to detect the bending angle, which makes installation, debugging and maintenance difficult. Summary of the Invention

[0003] To this end, it is necessary to provide a five-head pure hydraulic hoop bending machine to solve the problems of complex structure, high failure rate and poor manual locking effect of the headless hoop bending machine in the existing technology.

[0004] To achieve the above-mentioned purpose, the inventor provides a five-head pure hydraulic hoop bending machine, comprising a machine base, five heads, a first oil supply mechanism and a second oil supply mechanism;

[0005] The five machine heads are arranged side by side in sequence along the length of the machine base and are all connected to the machine base so as to be movable along the length of the machine base; a clamping mechanism is provided under each machine head, and the clamping mechanism includes a clamping oil cylinder, and the output end of the clamping oil cylinder is extended to abut against the machine base to limit the movement of the machine head;

[0006] The machine head includes a bending hoop mechanism, which includes an elbow disk, an elbow shaft, a core shaft, a telescopic oil cylinder, a gear shaft, and a bending oil cylinder; the elbow shaft is eccentrically arranged at the elbow disk; the core shaft is arranged parallel to the elbow shaft, and the core shaft passes through the center of the elbow disk until the head end of the core shaft is opposite to the elbow shaft; the output end of the telescopic oil cylinder is transmission-connected to the core shaft to drive the core shaft to extend and retract relative to the elbow disk; the gear shaft is sleeved at the tail end of the core shaft, and the end of the gear shaft is connected to the elbow disk; the output end of the bending oil cylinder is provided with a first rack, which is engaged with the teeth of the gear shaft to drive the gear shaft to rotate with the elbow disk;

[0007] The first oil supply mechanism is used to supply oil to the bending cylinders and five telescopic cylinders of the two head sections; the second oil supply mechanism is used to supply oil to the three bending cylinders and five pressing cylinders in the middle section.

[0008] The five telescopic oil cylinders are respectively connected to the first oil supply mechanism through a first valve; the five compacting oil cylinders are commonly connected to the second oil supply mechanism through a second valve.

[0009] As a preferred structure of the present invention, the head also includes a bending angle detection mechanism; the bending angle detection mechanism includes an encoder and an encoding shaft, the encoding shaft is fixed with an encoding gear, and the encoding gear is engaged with the teeth of the gear shaft to rotate synchronously with the gear shaft; the encoder is arranged at the circumference of the encoding shaft to read the angle value.

[0010] As a preferred structure of the present invention, the machine head also includes a connecting seat, and the bending hoop mechanism is arranged on the connecting seat; two sliding members facing each other are provided at the bottom of the connecting seat, and the inner sides of the two sliding members are provided with sliding grooves for the machine base to pass through; the machine base is passed between the two facing sliding grooves; the clamping mechanism is located between the connecting seat and the machine base.

[0011] As a preferred structure of the present invention, the cross-section of the machine base is I-shaped, and the machine base includes a top plate, a bottom plate and a connecting plate. The top plate and the bottom plate are arranged opposite each other up and down, and the connecting plate is vertically connected between the top plate and the bottom plate; the top plate passes through the sliding grooves of the two sliding parts of the machine head.

[0012] As a preferred structure of the present invention, the machine head also includes an adjusting gear and a rotating shaft; the machine base is provided with a second rack along the length direction; the rotating shaft can be axially rotated at a sliding member; the adjusting gear is fixedly sleeved on the rotating shaft and meshes with the second rack.

[0013] As a preferred structure of the present invention, the second rack is arranged at the bottom surface of the machine base, and the adjusting gear is located below the second rack.

[0014] As a preferred structure of the present invention, the rotating shaft is provided with a crank; or further includes a rotary motor, which is transmission-connected to the rotating shaft and is used to drive the rotating shaft to rotate with the gear to drive the machine head to move along the second rack.

[0015] As a preferred structure of the present invention, the clamping mechanism also includes a spring steel plate and a cylinder bottom plate; the spring steel plate is located between the clamping cylinder and the connecting seat, and is connected to two sliding parts; the output end of the clamping cylinder is arranged toward the machine base, and the cylinder bottom plate is connected to the end face of the output end of the clamping cylinder.

[0016] As a preferred structure of the present invention, a return elastic member is provided in the pressing oil cylinder, and the return elastic member is used to drive the output end of the pressing oil cylinder to shrink and return.

[0017] As a preferred structure of the present invention, the return elastic member is a wave spring.

[0018] Different from the existing technology, the five-head pure hydraulic hoop bending machine described in the above technical solution includes a machine base, five heads, a first oil supply mechanism and a second oil supply mechanism; a clamping mechanism is provided under each head, and the clamping mechanism includes a clamping oil cylinder, and the output end of the clamping oil cylinder limits the movement of the head when it is extended to the base; the head includes a bending hoop mechanism, and the bending hoop mechanism includes an elbow disk, an elbow shaft, a core shaft, a telescopic oil cylinder, a gear shaft, and a bending oil cylinder. By changing the structure, the working process of the whole machine can be hydraulically driven, that is, the extension and contraction of the core shaft, the rotation of the elbow disk and the locking of the head are all hydraulically driven, so that the drive system is single and simple, thereby making the structure of the whole machine compact and simple, and reducing the failure rate. In addition, the use of a clamping oil cylinder to lock the head can not only simplify the operation of locking the head, but also make the locking and positioning effect of the head better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of a five-head pure hydraulic hoop bending machine according to an embodiment of the present invention Figure 1 ;

[0020] Figure 2 The structure of a five-head pure hydraulic hoop bending machine according to an embodiment of the present invention Figure 2 ;

[0021] Figure 3 A structural diagram of a handpiece according to an embodiment of the present invention;

[0022] Figure 4 A partial structural diagram of a handpiece according to an embodiment of the present invention;

[0023] Figure 5 An exploded view of a portion of the structure of a machine head according to an embodiment of the present invention;

[0024] Figure 6 A diagram showing the connection structure of a connecting base and a pressing mechanism according to an embodiment of the present invention;

[0025] Figure 7 This is a diagram showing the matching structure of the second rack and the adjustment gear of the machine base according to one embodiment of the present invention;

[0026] Figure 8 This is a diagram showing the oil circuit structure of a five-head pure hydraulic hoop bender according to one embodiment of the present invention;

[0027] Figure 9 This is a diagram of the oil supply structure of the first oil supply mechanism according to one embodiment of the present invention;

[0028] Figure 10 FIG1 is a diagram of the oil supply structure of the second oil supply mechanism according to an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. Machine base;

[0031] 100, top plate; 101, bottom plate; 102, connecting plate;

[0032] 2. Machine head;

[0033] 200, elbow plate; 201, elbow shaft; 202, core shaft; 203, telescopic cylinder; 204, gear shaft; 205, bending cylinder; 2050, first rack; 206, encoder; 207, encoder shaft; 208, encoder gear; 209, connecting seat; 210, sliding member; 211, tailstock; 212, machine head housing; 213, bending hoop support block; 214, supporting wear-resistant sheet;

[0034] 3. Press the oil cylinder;

[0035] 4. Adjust the gear;

[0036] 5. Rotating shaft;

[0037] 6. Second rack;

[0038] 7. Crank handle;

[0039] 8. Spring steel plate;

[0040] 9. Oil cylinder bottom plate;

[0041] 1a, first bending cylinder;

[0042] 2a, second bending cylinder;

[0043] 3a. Telescopic cylinder;

[0044] 4a. Press the oil cylinder;

[0045] 5a, first oil pump;

[0046] 6a, first motor;

[0047] 7a, first fuel tank;

[0048] 8a, second oil pump;

[0049] 9a, second motor;

[0050] 10a, second fuel tank;

[0051] 11a, first main oil circuit pressure regulating valve;

[0052] 12a, first main valve;

[0053] 13a, second main oil circuit pressure regulating valve;

[0054] 14a, second main valve;

[0055] 15a, first bending electromagnetic reversing valve;

[0056] 16a, telescopic solenoid reversing valve;

[0057] 17a. Superimposed pressure reducing valve;

[0058] 18a, Cartridge valve;

[0059] 19a, second bending solenoid reversing valve;

[0060] 20a, one-way throttle valve;

[0061] 21a. Tighten the control valve. DETAILED DESCRIPTION

[0062] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0063] See also Figure 1 、 Figure 2 and Figure 3 The present invention provides a five-head pure hydraulic hoop bending machine for bending steel bars into a bent state, especially realizing pure hydraulic drive, optimizing the design of the hydraulic station to make the structure more simple and compact, and realizing hydraulic locking of the head 2, making the step of locking the head 2 more convenient and having a good locking effect.

[0064] In a specific embodiment, the five-head pure hydraulic hoop bending machine includes a machine base 1 and five heads 2. The machine base 1 is the base of the five-head pure hydraulic hoop bending machine, which is used to place the heads 2; the heads 2 are the actuators for bending steel bars, which can bend the steel bars after starting.

[0065] The five machine heads 2 are arranged side by side in sequence along the length direction of the machine base 1, and can be movably connected to the machine base 1 along the length direction of the machine base 1. By adjusting the spacing between each machine head 2, the steel bars can be bent into different sizes. When in use, if only the head and tail of the steel bars need to be bent, two of the machine heads 2 can be used for the operation. If the steel bars need to be bent into polygons, the machine bodies located at both ends of the machine base 1 can be used first, and then the three middle machine heads 2 can be used in turn for bending operations, so that the steel bars can be processed into different shapes.

[0066] In order to realize the movably connection between the machine head 2 and the machine base 1, the machine base 1 can be provided with a slide rail, and the machine head 2 can be provided with a slider, and the slider can be movably set in the slide rail. In a preferred embodiment, the machine head 2 includes a connecting seat 209, and the bottom of the connecting seat 209 is provided with two opposing sliding members 210, and the inner sides of the two sliding members 210 are provided with a slide groove for the machine base 1 to pass through; the machine base 1 is passed between the two opposing slide grooves. Such an arrangement makes the movement of the machine head 2 more stable.

[0067] In a preferred embodiment, the cross-section of the machine base 1 is I-shaped, and the machine base 1 includes a top plate 100, a bottom plate 101 and a connecting plate 102. The top plate 100 and the bottom plate 101 are arranged opposite each other up and down, and the connecting plate 102 is vertically connected between the top plate 100 and the bottom plate 101, and can be an I-beam; the top plate 100 passes through the slide grooves of the two sliding members 210 of the machine head 2. Such an arrangement ensures that when the machine base 1 is placed on a plane, it will not affect the arrangement of the sliding member 210. The sliding member 210 is in a suspended state. When the clamping mechanism does not clamp the machine head 2 and the machine base 1, the sliding member 210 can move freely.

[0068] A clamping mechanism is provided under each machine head 2, and the clamping mechanism includes a clamping cylinder 3. When the output end of the clamping cylinder 3 is extended to rest against the machine base 1, the movement of the machine head 2 is restricted. When the distance between adjacent machine heads 2 needs to be adjusted, the output end of the clamping cylinder 3 can be controlled to shorten to leave the machine base 1, that is, each machine head 2 is locked by the clamping cylinder 3. This locking method is not only convenient, but also has good effects.

[0069] When the machine head 2 includes a connecting seat 209 and is of the above-mentioned structure, there is a gap between the connecting seat 209 and the machine base 1, and the clamping mechanism is arranged at the bottom of the connecting seat 209 and is located above the machine base 1, that is, the clamping mechanism is arranged at the gap and is located between the two sliding members 210. When it is necessary to lock the machine head 2, the output end of the clamping cylinder 3 is extended until the output end of the clamping cylinder 3 is against the machine base 1, and the machine base 1 is clamped to the slide groove. At this time, the slide 210 cannot move along the length direction of the machine base 1, that is, the function of locking the machine head 2 is achieved; when it is necessary to adjust the position of the machine head 2, the output end of the clamping cylinder 3 is shortened until the output end of the clamping cylinder 3 leaves the machine base 1, and the machine base 1 does not apply any external force other than gravity to the slide groove. At this time, the slide 210 can move freely along the length direction of the machine base 1, that is, the effect of loosening the machine head 2 is achieved.

[0070] See also Figure 6In a further embodiment, the clamping mechanism also includes a spring steel plate 8 and a cylinder bottom plate 9; the spring steel plate 8 is located between the clamping cylinder 3 and the connecting seat 209, and is connected to two sliding members 210; the clamping cylinder 3 is arranged at the spring steel plate 8, and the output end of the clamping cylinder 3 is arranged toward the machine base 1, and the cylinder bottom plate 9 is located between the clamping cylinder 3 and the machine base 1, and can be connected to the end face of the output end of the clamping cylinder 3 (that is, the piston rod of the clamping cylinder). When the clamping cylinder 3 is started and the output end of the clamping cylinder 3 is extended, the clamping cylinder 3 will drive the cylinder base plate 9 to approach the machine base 1. When the cylinder base plate 9 is against the machine base 1, the clamping cylinder 3 continues to extend the output end. At this time, under the reaction force of the cylinder base plate 9, the spring steel plate 8 applies a thrust to the sliding part 210 away from the steel plate. At this time, the slide groove of the sliding part 210 and the machine base 1 form a clamping, and the sliding part 210 and the machine base 1 cannot move relative to each other, that is, the locking operation of the machine head 2 is completed.

[0071] In one embodiment, a return spring is provided within the compression cylinder 3, which may be a wave spring. Specifically, the interior of the compression cylinder 3 is divided into two enclosed spaces by the piston head: one for containing the oil, and the other for housing the return spring. When oil is pressed into the cylinder, the output end of the compression cylinder 3 extends under the propulsion of the oil. At this time, the return spring is in a compressed state, storing elastic potential energy. As the oil is withdrawn, the thrust of the oil gradually disappears, and the return spring gradually releases its elastic potential energy until the output end of the compression cylinder 3 is fully retracted.

[0072] The machine head 2 includes a bending hoop mechanism. When the machine base 1 includes a connecting seat 209 , the bending hoop mechanism is arranged on the connecting seat 209 . The bending hoop mechanism includes a bending disk 200, a bending shaft 201, a core shaft 202, a telescopic oil cylinder 203, a gear shaft 204, and a bending oil cylinder 205. The bending disk 200 is used to install the bending shaft 201. When rotating, it drives the bending shaft 201 to rotate eccentrically to bend the steel bar; the bending shaft 201 is used to bend the steel bar; the core shaft 202 is used to assist the bending shaft 201 in bending the steel bar, position the steel bar in the bending operation, and clamp the steel bar together with the bending shaft 201; the telescopic oil cylinder 203 is used to drive the core shaft 202 to retract when the steel bar needs to be placed in the machine head 2 to make way for the steel bar. After the steel bar has been placed in the machine head 2, the core shaft 202 is driven to extend and clamp the steel bar together with the bending shaft 201; the gear shaft 204 is used to transmit the rotational force that drives the bending disk 200 to rotate; the bending oil cylinder 205 is used to drive the gear shaft 204 to rotate, thereby indirectly driving the bending disk 200 to rotate.

[0073] The elbow shaft 201 is eccentrically arranged at the elbow disk 200; the core shaft 202 is arranged parallel to the elbow shaft 201, and the core shaft 202 passes through the center of the elbow disk 200, until the head end of the core shaft 202 is opposite to the elbow shaft 201. Specifically, a hole for the core shaft 202 to pass through is opened at the center of the elbow disk 200, and the diameter of the hole is larger than the diameter of the core shaft 202, so that the core shaft 202 can freely pass through the hole. Specifically, a sliding bearing is provided at the hole of the elbow disk for the core shaft to pass through, and the core shaft passes through the sliding bearing. The sliding bearing is sleeved on the core shaft, which plays a role of lubrication, and the core shaft can freely pass through the elbow disk. When the steel bars need to be placed in the machine head 2, the core shaft 202 and the elbow shaft 201 are respectively located on the two sides of the elbow disk 200. After the steel bars have been placed in the machine head 2, one end of the core shaft 202 passes through the hole until the end of the core shaft 202 and the elbow shaft 201 are on the same side of the elbow disk 200.

[0074] After the core shaft 202 is extended, the elbow disk 200 is driven to rotate, and the elbow shaft 201 is in the process of eccentric rotation. The elbow shaft 201 rotates around the core shaft 202, and one point of the steel bar is restricted by the core shaft 202. Under the push of the elbow shaft 201, the end of the steel bar will move around the fixed point. This process is the process of bending the steel bar, and the bending angle of the steel bar depends on the eccentric rotation angle of the elbow shaft 201.

[0075] The output end of the telescopic cylinder 203 is in transmission connection with the core shaft 202 to drive the core shaft 202 to extend and retract relative to the elbow disk 200. Specifically, the output end of the telescopic cylinder 203 is coaxially connected to the core shaft 202. When the output end of the telescopic cylinder 203 is extended, the core shaft 202 can be carried through the hole of the elbow disk 200. When the output end of the telescopic cylinder 203 is shortened, the core shaft 202 can be carried away from the elbow disk 200 in the direction away from the elbow shaft 201.

[0076] See also Figure 3 In order to ensure the stability of the core shaft 202 when supporting the steel bar, in a further embodiment, a tail stock 211 is further provided. The tail stock 211 is arranged opposite to the side of the elbow disk 200 where the elbow shaft 201 is arranged, and an opening for the core shaft 202 to pass through is provided at the tail stock 211 and the core shaft 202. The telescopic cylinder 203 drives the core shaft 202 to pass through the elbow disk 200 until the end of the core shaft 202 continues to pass through the opening. At this time, both ends of the core shaft 202 are supported, which can better support the steel bar.

[0077] See also Figure 4 and Figure 5The gear shaft 204 is sleeved on the tail end of the core shaft 202. The inner diameter of the gear shaft 204 is larger than the diameter of the core shaft 202, so that the core shaft 202 can freely pass through the interior of the gear shaft 204; the end of the gear shaft 204 is connected to the elbow disk 200, that is, the gear shaft 204 and the elbow disk 200 are integrated. When the gear shaft 204 is rotated under force, the elbow disk 200 rotates synchronously with it. As long as the gear shaft 204 is driven to rotate, the elbow disk 200 can be driven to rotate to bend the steel bar.

[0078] The output end of the bending cylinder is provided with a first rack 2050, which is engaged with the teeth of the gear shaft 204 to drive the gear shaft 204 to rotate with the elbow disk 200. Through such a structural setting, the linear motion of the cylinder is converted into rotational motion, which can then drive the elbow disk 200 to rotate, so that the cylinder can be used to drive the elbow disk 200 to rotate, and finally the whole machine can be driven by pure hydraulic drive, which simplifies the structure of the whole machine, makes the structure more compact and simple, reduces the probability of failure, and makes the cylinder drive performance more stable.

[0079] During production, a head housing 212 can be provided, wherein the gear shaft 204, the output end 2050 of the bending oil cylinder, and the output end of the telescopic oil cylinder 203 are all located in the head housing 212, and the gear shaft 204 is rotatably connected to the head housing 212 by a bearing. In this way, the bending hoop mechanism can be supported by the head housing 212, and the elbow disk 200 is supported to a suspended state. At this time, the axial directions of the mandrel 202, the elbow shaft 201, and the gear shaft 204 are all arranged in a horizontal direction. In addition, the closed design of the head housing 212 can effectively prevent dust and water, and thus can avoid repeated addition of lubricating oil. Each head 2 has an outer width of 120mm. According to the most compact design, it can achieve a hoop forming unilateral length of 120mm*120mm. The overall size of the machine can be directly connected to the straightening machine with a material rack for use. It has a beautiful appearance and is reliable and practical.

[0080] See also Figure 3 In order to ensure that the steel bars are stable and do not deviate during the bending process, a bending hoop support block 213 is provided on the connecting seat 209. The bending hoop support block 213 is set lower than the elbow plate 200, and a supporting wear-resistant plate 214 is provided on the top surface of the bending hoop support block 213 to prevent the steel bars from wearing the bending hoop support block 213.

[0081] In a further embodiment, the head 2 also includes a bending angle detection mechanism; the bending angle detection mechanism includes an encoder 206 and an encoding shaft 207, and the encoding shaft 207 is fixedly sleeved with an encoding gear 208, and the encoding gear 208 is engaged with the teeth of the gear shaft 204 to rotate synchronously with the gear shaft 204. Specifically, the encoding shaft 207 passes through the head housing 212 and is connected to the head housing 212 through a bearing. When the gear shaft 204 rotates, the encoding shaft 207 also rotates synchronously; the encoder 206 is arranged at the circumference of the encoding shaft 207, and when the encoding shaft 207 rotates, the angle value is read, so that the angle of the bent steel bar of the head 2 can be accurately and conveniently obtained. The angle of the bent steel bar can be selected in a variety of ways and is not limited. In addition, the encoder 206 is arranged at the circumference of the end of the encoding shaft 207 that does not pass through the head housing 212, that is, it adopts an external type, which is convenient for installation, debugging and maintenance.

[0082] When it is detected that the bending angle of the machine head 2 meets the required bending angle of the steel bar, the bending operation of the machine head 2 can be stopped. In order to facilitate control, a controller such as a single-chip microcomputer or a PLC programmable controller can be provided. When the machine head 2 rotates to a preset angle, the bending cylinder 205 is controlled to stop working.

[0083] See also Figure 7 In order to make the movement of the machine head 2 more stable and facilitate the adjustment of the position of the machine head 2, when the machine head 2 is provided with a connecting seat 209 and a sliding member 210, in a further embodiment, the machine head 2 also includes an adjusting gear 4 and a rotating shaft 5; the machine base 1 is provided with a second rack 6 along the length direction; the rotating shaft 5 can be axially rotatable at the location where the sliding member 210 is provided. Specifically, the rotating shaft 5 can be provided at the sliding member 210 through a bearing; the adjusting gear 4 is fixedly sleeved on the rotating shaft 5 and meshes with the second rack 6. By rotating the adjusting gear 4, the adjusting gear 4 will move along the second rack 6 with the connecting seat 209, the sliding member 210 and the bending hoop mechanism, which can prevent the entire machine head 2 from distorting during the movement. The user only needs to rotate the adjusting gear 4 to complete the work of adjusting the distance between adjacent machine heads 2.

[0084] The rotating shaft 5 can be rotated manually. For the convenience of operation, the rotating shaft 5 can be provided with a crank 7; or it can be driven by electricity, that is, it also includes a rotating motor and a reducer. The rotating motor is connected to the rotating shaft 5 through the reducer, and is used to drive the rotating shaft 5 to rotate with the gear to drive the head 2 to move along the second rack 6.

[0085] In order to avoid dust accumulation on the second rack 6 and the adjusting gear 4, it is preferred to set the machine base 1 into the above-mentioned shape. At this time, the second rack 6 is set at the bottom surface of the machine base 1, and the adjusting gear 4 is located under the second rack 6. Dust or rainwater can fall directly to the ground.

[0086] See also Figure 8 The five-head pure hydraulic hoop bender also includes a first oil supply mechanism and a second oil supply mechanism. The five bending cylinders, five telescopic cylinders, five clamping cylinders, the first oil supply mechanism, and the second oil supply mechanism together form the hydraulic system of the five-head pure hydraulic hoop bender. For ease of explanation, the bending cylinders of the first and last heads are referred to as first bending cylinders, and the bending cylinders of the three middle heads are referred to as second bending cylinders.

[0087] See also Figure 9 The first oil supply mechanism is used to supply oil to the two first bending cylinders 1a and the five telescopic cylinders 3a; please refer to Figure 10 The second oil supply mechanism is used to supply oil to the three second bending cylinders 2a and the five pressing cylinders 4a. The five telescopic cylinders 3a are each connected to the first oil supply mechanism via a first valve; the five pressing cylinders 4a are collectively connected to the second oil supply mechanism via a second valve.

[0088] Since the working state of the five-head pure hydraulic hoop bending machine includes using only the head and tail two heads for hoop bending operations, and more than two (such as five) heads for successive hoop bending operations, the two first bending cylinders 1a are supplied with oil separately through the first oil supply mechanism, and the three second bending cylinders 2a are supplied with oil separately through the second oil supply mechanism. In this way, the two first bending cylinders 1a can be controlled separately, and the three second bending cylinders 2a can be controlled separately.

[0089] If only two machine heads are used for the hoop bending operation, after the position adjustment of the machine heads is completed and the machine heads are clamped, only the first oil supply mechanism can perform the oil supply operation. When the first oil supply mechanism performs the oil supply operation, the two first bending cylinders 1a operate synchronously; in addition, since the five telescopic cylinders 3a are each connected to the first oil supply mechanism through a first valve, therefore, when only the two first bending cylinders 1a are operating, only the first valves of the two telescopic cylinders 3a corresponding to the first bending cylinders 1a can be opened, so that the first oil supply mechanism can supply oil to the two telescopic cylinders 3a separately to cooperate with the two first bending cylinders 1a to operate.

[0090] If the five machine heads perform bending operations one after another, after the position adjustment of the machine heads is completed and the machine heads are clamped, the first oil supply mechanism and the second oil supply mechanism are started in sequence according to the progress of the steel bar bending. First, the first oil supply mechanism performs the oil supply operation, and the two first bending cylinders 1a operate synchronously. At this time, only the first valves of the two telescopic cylinders 3a corresponding to the first bending cylinder 1a are opened, so that the first oil supply mechanism can supply oil to the two telescopic cylinders 3a alone to cooperate with the two first bending cylinders 1a to operate; after the bending of both ends of the steel bar is completed, the second oil supply mechanism is started. When the second oil supply mechanism performs the oil supply operation, the three second bending cylinders 2a operate synchronously. At this time, only the first valves of the three telescopic cylinders 3a corresponding to the second bending cylinder 2a are opened, so that the first oil supply mechanism can supply oil to the three telescopic cylinders 3a alone to cooperate with the three second bending cylinders 2a to operate.

[0091] Since the five clamping oil cylinders 4a are connected to the second oil supply mechanism through a second valve, when the second oil supply mechanism is started, as long as the second valve is opened, the five clamping oil cylinders 4a can be driven to lock the five machine heads respectively.

[0092] In a further embodiment, the first oil supply mechanism includes a first oil pump 5a and a first oil tank 7a. Oil is stored in the first oil tank 7a. The oil inlet of the first oil pump 5a is connected to the first oil tank 7a. Specifically, the first oil pump 5a is driven by the first motor 6a. When the first motor 6a is started, the first oil pump 5a can work to extract the oil in the first oil tank 7a to each oil circuit; the oil inlets of the first bending oil cylinder 1a and the first valve are connected to the oil outlet of the first oil pump 5a. Specifically, they are all connected through oil pipes. The oil circuit connected to the oil outlet of the first oil pump 5a is the main oil circuit, and the oil circuit connected to the main oil circuit by the first bending oil cylinder 1a and the first valve is a branch oil circuit. Each branch oil circuit is connected to the main oil circuit through an oil distributor.

[0093] Similarly, the second oil supply mechanism includes a second oil pump 8a and a second oil tank 10a. The second oil tank 10a also contains oil. The oil inlet of the second oil pump 8a is connected to the second oil tank 10a. Specifically, the second oil pump 8a is driven by a second motor 9a. When the second motor 9a is started, the second oil pump 8a can operate and pump the oil in the second oil tank 10a to various oil circuits. The second oil tank can be the same oil tank as the first oil tank, that is, the first and second oil pumps share the same oil tank. The oil inlets of the second bending oil cylinder 2a and the second valve are both connected to the oil outlet of the second oil pump 8a, specifically, through oil pipes. The oil circuit connected to the oil outlet of the second oil pump 8a is the main oil circuit, and the oil circuits connected to the main oil circuit by the second bending oil cylinder 2a and the second valve are branch oil circuits. Each branch oil circuit is connected to the main oil circuit through an oil distributor.

[0094] In one embodiment, the oil outlet of the first oil pump 5a is sequentially provided with a first main oil circuit pressure regulating valve 11a and a first main valve 12a. The first main oil circuit pressure regulating valve 11a is used to regulate the pressure of the oil pumped by the first oil pump 5a to prevent damage to the oil pipe or other components receiving the oil. The first main valve 12a is used to open or close the main oil circuit of the first oil pump 5a. The oil outlet of the first oil pump 5a is connected to the oil inlet of the first main oil circuit pressure regulating valve 11a. The oil outlet of the first injection oil circuit pressure regulating valve is connected to the P port of the first main valve 12a. The A port of the main valve of the first oil pump 5a is connected to the oil inlet of the first bending cylinder 1a and the first valve.

[0095] The oil outlet of the second oil pump 8a is sequentially equipped with a second main oil circuit pressure regulating valve 13a and a first main valve 12a. The second main oil circuit pressure regulating valve 13a is used to adjust the pressure of the oil pumped by the second oil pump 8a to prevent damage to the oil pipes or other components receiving the oil. The second main valve 14a is used to open or close the main oil circuit of the second oil pump 8a. The oil outlet of the second oil pump 8a is connected to the oil inlet of the second main oil circuit pressure regulating valve 13a. The oil outlet of the second injection oil circuit pressure regulating valve is connected to the P port of the second main valve 14a and the oil inlet of the second valve. The A port of the main valve of the second oil pump 8a is connected to the second bending cylinder 2a.

[0096] In order to achieve both the extension and the shortening of the output end of the first bending cylinder 1a through oil, so as to realize the forward rotation and the rotation of the bending disk, in a further embodiment, each first bending cylinder 1a is connected to the first oil supply mechanism through a first bending solenoid reversing valve 15a, and the first bending solenoid reversing valve 15a is used to change the direction in which the first oil supply mechanism supplies oil to the first bending cylinder 1a. Specifically, the P interface of the first curved solenoid reversing valve 15a is connected to the oil outlet of the first oil pump 5a, and the T interface of the first curved solenoid reversing valve 15a is connected to the first oil tank 7a, wherein the T interface of the first curved solenoid reversing valve 15a can be connected to one first oil tank 7a together with the oil inlet of the first oil pump 5a, or there can be two first oil tanks 7a, and the T interface of the first curved solenoid reversing valve 15a can be connected to the two first oil tanks 7a respectively together with the oil inlet of the first oil pump 5a; the A interface and the B interface of the first curved solenoid reversing valve 15a are respectively connected to the rodless chamber and the rod chamber of the first curved oil cylinder 1a.

[0097] When the output end of the first bending oil cylinder 1a needs to be extended, the first oil supply mechanism supplies oil to the first bending oil cylinder 1a in the following direction: the oil pumped by the first oil pump 5a enters the A port from the P port, and then enters the rodless cavity of the first bending oil cylinder 1a through the A port. During this process, the oil in the rod cavity of the first bending oil cylinder 1a is squeezed by the oil in the rodless cavity and flows to the B port, then from the B port to the T port, and finally flows back to the first oil tank 7a from the T port. When the output end of the first bending oil cylinder 1a needs to be shortened, the first oil supply mechanism supplies oil to the first bending oil cylinder 1a in the following direction: the oil pumped by the first oil pump 5a enters the B port from the P port, and then from the B port to the rod cavity of the first bending oil cylinder 1a through the B port. During this process, the oil in the rod cavity of the first bending oil cylinder 1a is squeezed by the oil in the rod cavity and flows to the A port, then from the A port to the T port, and finally flows back to the first oil tank 7a from the T port.

[0098] In order to enable the two telescopic cylinders 3a corresponding to the two first bending cylinders 1a to work with the two first bending cylinders 1a, in a further embodiment, the B interfaces of the two first bending solenoid reversing valves 15a are also respectively connected to the two telescopic cylinders 3a.

[0099] In a further embodiment, the first valve is a cartridge valve 18a, which is used to open or close the oil circuit. In addition, in order to achieve both the extension of the output end of the telescopic cylinder 3a and the shortening of the output end of the rope cylinder through oil, a telescopic electromagnetic reversing valve 16a is also included; the P interface of the telescopic electromagnetic reversing valve 16a is connected to the oil outlet of the first oil pump 5a, and the T interface of the telescopic electromagnetic reversing valve 16a is connected to the first oil tank 7a. Similarly, the T interface of the telescopic electromagnetic reversing valve 16a can be connected to one first oil tank 7a together with the oil inlet of the first oil pump 5a, or there can be two first oil tanks 7a, and the T interface of the telescopic electromagnetic reversing valve 16a can be connected to the oil inlet of the first oil pump 5a and the two first oil tanks 7a respectively; the A interface of the telescopic electromagnetic reversing valve 16a is connected to the rod chambers of the five telescopic cylinders 3a; the B interface of the telescopic electromagnetic reversing valve 16a is connected to the rodless chambers of the five telescopic cylinders 3a; the cartridge valve 18a is located at the oil circuit where the rodless chamber of the telescopic cylinder 3a is connected to the B interface of the telescopic electromagnetic reversing valve 16a.

[0100] Similarly, when the output end of the telescopic cylinder 3a needs to be shortened, the first oil supply mechanism supplies oil to the telescopic cylinder 3a in the following direction: the oil pumped by the first oil pump 5a enters the A port from the P port, and then enters the rod cavity of the telescopic cylinder 3a through the A port. During this process, the oil in the rodless cavity of the telescopic cylinder 3a flows to the B port under the pressure of the oil in the rod cavity, and then flows from the B port to the T port, and finally flows back to the first oil tank 7a from the T port. When the output end of the first bending cylinder 1a needs to be extended, the first oil supply mechanism supplies oil to the telescopic cylinder 3a in the following direction: the oil pumped by the first oil pump 5a enters the B port from the P port, and then enters the T port from the B port into the rodless cavity of the telescopic cylinder 3a through the B port. During this process, the oil in the rodless cavity of the telescopic cylinder 3a flows to the A port under the pressure of the oil in the rodless cavity, and then flows from the A port to the T port, and finally flows back to the first oil tank 7a from the T port.

[0101] In a further embodiment, a superimposed pressure reducing valve 17a is further provided at the oil circuit connecting the rodless chamber of each telescopic oil cylinder 3a and the B interface of the telescopic electromagnetic reversing valve 16a.

[0102] In order to achieve both the extension and the shortening of the output end of the second bending cylinder 2a through oil, so as to realize the forward rotation and the rotation of the bending disk, in a further embodiment, each second bending cylinder 2a is connected to the second oil supply mechanism through a second bending solenoid reversing valve 19a, and the second bending solenoid reversing valve 19a is used to change the direction in which the second oil supply mechanism supplies oil to the second bending cylinder 2a. Specifically, the P interface of the second bending solenoid reversing valve 19a is connected to the oil outlet of the second oil pump 8a, and the T interface of the second bending solenoid reversing valve 19a is connected to the second oil tank 10a; wherein, the T interface of the second bending solenoid reversing valve 19a can be connected to a second oil tank 10a together with the oil inlet of the second oil pump 8a, or there can be two second oil tanks 10a, and the T interface of the second bending solenoid reversing valve 19a can be connected to the oil inlet of the second oil pump 8a and the two second oil tanks 10a respectively; the A interface and B interface of the second bending solenoid reversing valve 19a are respectively connected to the rodless chamber and the rod chamber of the second bending oil cylinder 2a.

[0103] Similarly, when the output end of the second bending cylinder 2a needs to be extended, the direction in which the second oil supply mechanism supplies oil to the second bending cylinder 2a is: the oil drawn by the second oil pump 8a enters the A interface from the P interface, and then enters the rodless cavity of the first bending cylinder 1a through the A interface. During this process, the oil in the rod cavity of the first bending cylinder 1a flows to the B interface under the squeezing action of the oil in the rodless cavity, and then enters the T interface from the B interface, and finally flows back to the second oil tank 10a from the T interface. When the output end of the second bending cylinder 2a needs to be shortened, the direction in which the second oil supply mechanism supplies oil to the second bending cylinder 2a is: the oil drawn by the second oil pump 8a enters the P interface from the B interface, and then enters the rod cavity of the second bending cylinder 2a through the B interface. During this process, the oil in the rodless cavity of the second bending cylinder 2a flows to the A interface under the squeezing action of the oil in the rod cavity, and then enters the T interface from the A interface, and finally flows back to the second oil tank 10a from the T interface.

[0104] In order to enable the three telescopic cylinders 3a corresponding to the three second bending cylinders 2a to work with the three second bending cylinders 2a, in a further embodiment, the B interfaces of the three second bending solenoid reversing valves 19a are also respectively connected to the three telescopic cylinders 3a.

[0105] In a further embodiment, a one-way throttle valve 20a is provided at the oil circuit connecting the rodless chambers of the two second bending oil cylinders 2a and the A interface of the second bending electromagnetic reversing valve 19a.

[0106] In a further embodiment, a return elastic member is provided in the rod cavity of the clamping cylinder 4a; the second valve is a clamping control valve 21a, and the rodless cavities of the five clamping cylinders 4a are all connected to the clamping control valve 21a. When the clamping control valve 21a is energized, oil pressure is provided, and the output ends of the five clamping cylinders 4a are extended to the locking machine head. During this process, the wave spring is deformed and compressed; when the clamping control valve 21a is de-energized, there is no oil pressure, the wave spring is restored, the output ends of the five clamping cylinders 4a are shortened, and the hydraulic oil flows back. It should be noted that although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structure or equivalent process transformations made using the contents of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of patent protection of the present invention.

Claims

1. A five-head pure hydraulic hoop bending machine, characterized in that: It includes a machine base, five machine heads, a first oil supply mechanism and a second oil supply mechanism; The five machine heads are arranged side by side in sequence along the length direction of the machine base and are all connected to the machine base so as to be movably connected along the length direction of the machine base; a clamping mechanism is provided under each machine head, and the clamping mechanism includes a clamping oil cylinder, and when the output end of the clamping oil cylinder is extended to abut against the machine base, the movement of the machine head is restricted; The machine head includes a bending hoop mechanism, which includes an elbow disk, an elbow shaft, a core shaft, a telescopic oil cylinder, a gear shaft, and a bending oil cylinder; the elbow shaft is eccentrically arranged at the elbow disk; the core shaft is arranged parallel to the elbow shaft, and the core shaft passes through the center of the elbow disk until the head end of the core shaft is opposite to the elbow shaft; the output end of the telescopic oil cylinder is transmission-connected to the core shaft to drive the core shaft to extend and retract relative to the elbow disk; the gear shaft is sleeved at the tail end of the core shaft, and the end of the gear shaft is connected to the elbow disk; the output end of the bending oil cylinder is provided with a first rack, which is engaged with the teeth of the gear shaft to drive the gear shaft to rotate with the elbow disk; The bending cylinders of the first and last heads are the first bending cylinders, and the bending cylinders of the three middle heads are the second bending cylinders; the first oil supply mechanism is used to supply oil to the two first bending cylinders and the five telescopic cylinders; the second oil supply mechanism is used to supply oil to the three second bending cylinders and the five pressing cylinders; The five telescopic oil cylinders are each connected to the first oil supply mechanism through a first valve; the five compression oil cylinders are connected to the second oil supply mechanism through a second valve. The first oil supply mechanism includes a first oil pump and a first oil tank, the oil inlet of the first oil pump is connected to the first oil tank; the oil inlets of the first bending oil cylinder and the first valve are both connected to the oil outlet of the first oil pump, each first bending oil cylinder is connected to the first oil supply mechanism via a first bending solenoid reversing valve, the A interface and the B interface of the first bending solenoid reversing valve are respectively connected to the rodless cavity and the rod cavity of the first bending oil cylinder, and the B interfaces of the two first bending solenoid reversing valves are also respectively connected to the two telescopic oil cylinders; The second oil supply mechanism includes a second oil pump and a second oil tank, the oil inlet of the second oil pump is connected to the second oil tank; the oil inlets of the second bending oil cylinder and the second valve are connected to the oil outlet of the second oil pump, and each second bending oil cylinder is connected to the second oil supply mechanism through a second bending solenoid reversing valve; the A interface and the B interface of the second bending solenoid reversing valve are respectively connected to the rodless cavity and the rod cavity of the second bending oil cylinder; the B interfaces of the three second bending solenoid reversing valves are also respectively connected to the three telescopic oil cylinders; A return elastic member is provided in the said pressing oil cylinder, and the said return elastic member is used to drive the output end of the pressing oil cylinder to shrink and return; The second valve is a clamping control valve, and the rodless chambers of the five clamping oil cylinders are all connected to the clamping control valve; It also includes a telescopic electromagnetic reversing valve, wherein the A interface of the telescopic electromagnetic reversing valve is connected to the rod chambers of the five telescopic oil cylinders; the B interface of the telescopic electromagnetic reversing valve is connected to the rodless chambers of the five telescopic oil cylinders.

2. The five-head pure hydraulic hoop bender according to claim 1 is characterized in that: The head also includes a bending angle detection mechanism; the bending angle detection mechanism includes an encoder and an encoding shaft, the encoding shaft is fixed with an encoding gear, the encoding gear is engaged with the teeth of the gear shaft to rotate synchronously with the gear shaft; the encoder is arranged at the circumference of the encoding shaft to read the angle value.

3. The five-head pure hydraulic hoop bender according to claim 2 is characterized in that: The machine head also includes a connecting seat, and the bending hoop mechanism is arranged on the connecting seat; two sliding parts facing each other are provided at the bottom of the connecting seat, and the inner sides of the two sliding parts are provided with sliding grooves for the machine base to pass through; the machine base is passed between the two facing sliding grooves; the clamping mechanism is located between the connecting seat and the machine base.

4. The five-head pure hydraulic hoop bender according to claim 3 is characterized in that: The cross-section of the machine base is I-shaped, and the machine base includes a top plate, a bottom plate and a connecting plate. The top plate and the bottom plate are arranged opposite each other up and down, and the connecting plate is vertically connected between the top plate and the bottom plate; the top plate passes between the sliding grooves of the two sliding parts of the machine head.

5. The five-head pure hydraulic hoop bender according to claim 3 is characterized in that: The machine head also includes an adjusting gear and a rotating shaft; the machine base is provided with a second rack along the length direction; the rotating shaft is axially rotatable at a location where a sliding member is provided; the adjusting gear is fixedly sleeved on the rotating shaft and meshes with the second rack.

6. The five-head pure hydraulic hoop bender according to claim 5, characterized in that: The second rack is arranged on the bottom surface of the machine base, and the adjusting gear is located below the second rack.

7. The five-head pure hydraulic hoop bender according to claim 5, characterized in that: The rotating shaft is provided with a crank; or further includes a rotary motor, which is transmission-connected to the rotating shaft and is used to drive the rotating shaft to rotate with the gear, so as to drive the machine head to move along the second rack.

8. The five-head pure hydraulic hoop bender according to claim 3 is characterized in that: The clamping mechanism also includes a spring steel plate and a cylinder bottom plate; the spring steel plate is located between the clamping cylinder and the connecting seat, and is connected to two sliding parts; the output end of the clamping cylinder is set toward the machine base, and the cylinder bottom plate is connected to the end face of the output end of the clamping cylinder.

9. The five-head pure hydraulic hoop bender according to claim 1, characterized in that: The return elastic member is a wave spring.

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