CN211866255U - Bending machine with plate bending follow-up control function - Google Patents

Abstract

The utility model discloses a take sheet material bending machine of servo control function of bending belongs to the sheet metal material technical field that bends. The front side and/or the rear side of the bending machine workbench is/are provided with a bent plate follow-up material supporting device; the bent plate follow-up material supporting device controls the action through a hydraulic system; in the bent plate follow-up material supporting device, the middle parts of the driving support rods are hinged; one end of the active supporting rod is hinged on the base, and the other end of the active supporting rod is movably connected with the base; one end of the driven supporting rod is hinged to one end of the material supporting plate, and the other end of the driven supporting rod is movably connected with the upper sliding seat; the driving cylinder is hinged on the base and is connected with the driving support rod; in the hydraulic system, an oil supply part provides pressure oil for a driving cylinder and controls the flow rate and the flow velocity of the hydraulic oil, and a material supporting control part controls the telescopic action of the driving cylinder. The utility model discloses only need principal and subordinate branch can realize holding in the palm the upset action of flitch, the structure is simplified, and structural rigidity is stronger, and steerable realization plate material is bent in hold in the palm the accurate reliable following of flitch, and control mode is simple, easy realization.

Description

Bending machine with plate bending follow-up control function

Technical Field

The utility model belongs to the technical field of the metal sheet material is bent, relate to the support material technique on the mainly used bender, more specifically say, relate to a take sheet material to bend follow-up control function's bender.

Background

In the industry, a bending machine is generally adopted for bending metal plates, and the bending machine is a machine capable of bending thin plates and comprises a support, a workbench, a clamping plate and a rear material blocking plate, wherein the workbench is arranged on the support and consists of a base and a pressing plate, and the base is connected with the clamping plate through a hinge. The bending machine product is widely applicable to the industries of electromechanics, sheet metals, light industry, aviation, ships, instruments, electrical appliances, stainless steel products, steel structure buildings, metallurgy and the like, is used for bending various steel plates, stainless steel, copper plates, aluminum plates and non-metal material plates, can be folded into V-shaped, arc-shaped, circular or right-angle shapes and the like, and can be designed and processed into a special-shaped die according to requirements.

Most bending machines are also equipped with front support means for supporting the sheet material as it is fed in, for example, chinese patent publication No.: 207255078U's utility model discloses a forestock material device for bender, including the support frame with be located the saddle on support frame top, it is provided with stop device to correspond on the side about the saddle, on the left side of saddle, respectively there is a stop device that is located same horizontal plane at both ends around the right side, stop device is including adjusting the post, slider and limiting plate, adjust the left and right flank of the saddle that the post is connected respectively perpendicular to, adjust the post and can stretch out and draw back in the saddle is inside, the slider is connected on the top of adjusting the post, limiting plate connection is in the side of slider, the limiting plate is the F type. The device can be used for supporting the plate when bending, can limit the position of the feeding plate, does not need workers to repeatedly position in the continuous bending process, but has the defect that the plate can not be supported because the plate is separated from the front supporting device in the bending and bending process. Particularly, when a large plate is bent, the quickly bent and turned-up workpiece can generate certain deformation, and safety accidents are easy to happen when the bent workpiece falls down.

Based on the above problems, there is a technology of supporting materials in a bending process, for example, chinese patent publication No. is: the invention of CN 102228918A discloses a follow-up tracking material supporting device for a bending machine, which comprises a machine body, a turnover body and a table board, wherein the machine body is connected with a movable body capable of moving longitudinally, the position of the movable body is displayed by a position display, a double-parallelogram mechanism is hinged between the movable body and the turnover body, the double-parallelogram mechanism is connected with a driving oil cylinder, the driving oil cylinder is connected with a numerical control system of the bending machine through a hydraulic servo valve, and the numerical control system of the bending machine controls the driving oil cylinder to drive the double-parallelogram mechanism and drive the turnover body to turn over. Should through the upset motion orbit and the speed of control upset body to strive for it to be the same with the upset orbit and the speed of work piece, thereby realize automatic following, but its drawback that has several following aspects:

firstly, the connecting rod has a complex structure, occupies space, has high requirements on manufacturing cost and precision, and has high installation difficulty; meanwhile, the structural form has poor rigidity and small bearing force which is generally less than 100 kg;

the following purpose is achieved by simulating the same turning track and speed of the workpiece, but the moving tracks of the workpieces with different sizes and weights are different, so that the workpieces are required to be adjusted and matched according to different plates, the adaptability is poor, the control requirements on a servo driving system and a proportional servo valve system are extremely high, the plates are often separated from the surface of a material supporting device, and the real following cannot be achieved;

and thirdly, after the plate is bent, the bent plate can be clamped at the front side and the rear side of the upper die, and the plate is difficult to take out.

Therefore, how to support the material in the plate turning process and solve the problems can be well achieved, and the method is worthy of further research.

In addition, the scheme of the tracking and supporting device only provides the structure of a mechanical part, and simply refers to that a numerical control system is adopted to control a hydraulic servo valve to complete tracking action, but does not provide the structure of a corresponding hydraulic control part, so that the technical scheme cannot be specifically realized by people in the field and needs to be further improved.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

The utility model provides a take plate material to bend bender of follow-up control function, the follow-up of its aim at solving current bender is tracked and is held in the palm the material device and reach the purpose of following through the upset orbit and the speed of simulation work piece the same, the connecting rod structure of adoption is comparatively complicated, not only comparatively occupation space, manufacturing cost and required precision are higher, the installation degree of difficulty is also big, the rigidity is relatively poor, and to servo drive system, proportional servo valve system control requirement is high, still often the plate material breaks away from and holds in the palm material device surface, the reliability is poor, can't realize the problem of really following.

2. Technical scheme

In order to solve the problems of complicated follow-up tracking material supporting structure, extremely high requirement on a control system and poor reliability of the conventional bending machine, the utility model provides a bending machine with a plate bending follow-up control function, wherein a bending plate follow-up material supporting device is arranged on the front side and/or the rear side of a bending machine workbench; the bent plate follow-up material supporting device controls actions through a hydraulic system (600), wherein:

the bent plate follow-up material supporting device comprises a base, a driving support rod, a driven support rod, a material supporting plate and a driving cylinder; the middle part of the driving strut is hinged with the middle part of the driven strut; one end of the driving support rod is hinged on the base, and the other end of the driving support rod is movably arranged in a lower chute of an upper sliding seat and a lower sliding seat of the base; one end of the driven supporting rod is hinged to one end of the material supporting plate, and the other end of the driven supporting rod is movably arranged in an upper sliding groove of an upper sliding seat positioned on the lower side of the other end of the material supporting plate; the driving cylinder is hinged on the base, the driving end of the driving cylinder is hinged on the driving support rod, and the hinged point is located between the hinged point of the driving support rod and the driven support rod and the connecting point of the driving support rod and the upper sliding seat.

Compared with the existing complex structure with a plurality of connecting rods, the structure can realize the overturning action of the retainer plate only by the driving supporting rod and the driven supporting rod, the structure is greatly simplified, the manufacturing cost and the precision are greatly reduced, the installation difficulty is extremely low, the structure is compact, and the occupied space is small; and the cross supporting mode of the main supporting rod and the auxiliary supporting rod has stronger structural rigidity, can support large thick plates along with the main supporting rod, has the material supporting force as high as 1000kg, and greatly improves the bearing capacity. The driving cylinder can sink by utilizing a pit, so that the ground space is reduced, and the occupied area is further reduced.

In the scheme, the two end parts of the driving support rod and the two end parts of the driven support rod are bent in opposite directions, so that the hinge point of the driving support rod and the driven support rod is deviated towards one end, a longer moment arm distance is reserved for the driving cylinder, and the bearing force is increased; meanwhile, the retainer plate can be prevented from being turned downwards to a lower limit position to generate interference, and the retainer plate can be placed horizontally.

In order to realize reliable movable matching of the driving support rod and the lower chute and the driven support rod and the upper chute, an upper roller is arranged at one end of the driving support rod matched with the lower chute of the lower sliding seat, and the upper roller can roll and translate along with the turning of the driving support rod in the lower chute, so that the requirement of degree of freedom is met; driven strut with the gyro wheel is down installed to the last spout complex one end of upper slide, and the gyro wheel can be followed along with driven strut's upset rolling translation down in last spout satisfies the degree of freedom requirement. The rollers on the main supporting rod and the auxiliary supporting rod can realize self rotation and simultaneously roll and translate along the sliding groove to complete compound movement and reduce friction.

In order to ensure that the plate material can be well attached to the surface of the material supporting plate in the bending process, a sensor for detecting whether the plate material is separated from the material supporting surface of the material supporting plate is arranged on the upper side surface of the material supporting plate, and once the plate material is separated, the sensor can immediately sense the plate material, so that the action of the driving cylinder is controlled to recover the attachment in a very short time.

In order to conveniently take out the plate after the plate is bent, at least one electromagnet which does not protrude out of the surface of the plate is arranged in the groove in the upper side surface of the material supporting plate, and the bent plate can be adsorbed on the surface of the material supporting plate, so that the position and the posture of the plate are adjusted, and the plate can be taken out from the most convenient position.

On the basis of the scheme, limit switches are arranged at the left end and the right end of the lower chute corresponding to the upper-lower overturning limit positions of the retainer plate, so that the upper-lower overturning angle of the retainer plate can be controlled, and safety protection is realized. The lower chute is internally provided with a variable-speed proximity switch close to the limit switch corresponding to the lower overturning limit position of the retainer plate, the retainer plate quickly falls before being overturned downwards and touching the proximity switch, and the retainer plate slowly falls after touching the proximity switch until reaching the horizontal position.

The hydraulic system in the bending machine comprises an oil tank, a material supporting control part and an oil supply part, wherein the oil inlet side of the oil supply part is connected with oil; the oil inlet end of the material supporting control part is connected with the oil outlet side of the oil supply part and comprises a three-position four-way reversing valve and a two-position four-way reversing valve; the port P of the three-position four-way reversing valve is connected with the oil outlet side of the oil supply part, the port T of the three-position four-way reversing valve is connected with the oil tank, and the port A and the port B of the three-position four-way reversing valve are respectively connected with a rod cavity and a rodless cavity of the driving cylinder; one oil port of the two-position four-way reversing valve is connected with a rodless cavity of the driving cylinder, a T port of the two-position four-way reversing valve is connected with an oil tank, and the other two oil ports are closed.

The hydraulic system controls the extension of the driving cylinder through the three-position four-way reversing valve, and then drives the material supporting plate to turn up and down, so that the following and the material discharging of the plate bending are realized. The control of the pressure oil of the hydraulic system is mainly realized by an oil supply part, and the oil supply part comprises a main oil pump, a sequence valve and a main electromagnetic overflow valve; the oil inlet end of the main oil pump is connected with an oil tank, and the oil outlet end of the main oil pump is connected with a port P of the three-position four-way reversing valve through a one-way valve; the sequence valve is connected between the oil outlet end of the main oil pump and the oil tank; and the main electromagnetic overflow valve is connected between the port P of the three-position four-way reversing valve and the oil tank. The main oil pump provides main pressure oil for the system, and the main electromagnetic overflow valve plays roles in constant-pressure overflow, pressure stabilization, system unloading and safety protection; the sequence valve controls the flow of pressure oil of the main oil pump, and the pressure is set so that the driving cylinder drives the material supporting plate to just support the plate and not jack the plate, so that the plate is always attached to the surface of the material supporting plate.

In order to ensure the following reliability of the material supporting plate in the bending process of the plate, an auxiliary oil pump is added into the system, namely the oil supply part also comprises the auxiliary oil pump and an auxiliary electromagnetic overflow valve; the oil inlet end of the auxiliary oil pump is connected with an oil tank, and the oil outlet end of the auxiliary oil pump is connected with a port P of the three-position four-way reversing valve through another one-way valve; the auxiliary electromagnetic overflow valve is connected between an oil outlet of the auxiliary oil pump and the oil tank; the overflow pressure of the main electromagnetic overflow valve is greater than the electromagnetic pressure of the auxiliary electromagnetic overflow valve. When the main oil pump cannot guarantee that the material supporting plate tightly follows the bending speed of the plate, the auxiliary oil pump can be controlled to intervene to work, flow supplement is carried out, the overturning speed of the material supporting plate is improved, the speed difference is eliminated, and the following reliability is guaranteed.

Meanwhile, in order to adjust the pose of the plate after bending so as to take out the plate from the bending machine, the driving cylinder adopts a telescopic hydraulic cylinder, a large piston rod extends in place, and a small piston rod can continue to extend under the action of a secondary oil pump so as to turn over the plate at a large angle further and adjust the position. And the two material supporting control parts are respectively connected with a driving cylinder, and are used for supporting the plate materials from the front side and the rear side of the workbench of the bending machine, so that the bending stability of the plate materials is further improved, the surface quality of the plate materials is also ensured, and the pose of the plate materials is more conveniently adjusted.

In addition, the safety of the bent plate needs to be ensured during discharging, so the material supporting control part also comprises a one-way throttle valve; the one-way throttle valve is arranged between the port B of the three-position four-way reversing valve and the rodless cavity of the driving cylinder, wherein the opening direction of the one-way valve flows to the driving cylinder from the three-position four-way reversing valve. The intervention time of the one-way throttle valve is controlled through the two-position four-way reversing valve, so that the material can be quickly discharged after being bent, and is slowly and stably discharged when the material is close to the horizontal level, the danger caused by smashing of a heavy object is avoided, the blanking time is greatly saved, and the working efficiency is effectively improved.

Drawings

FIG. 1 is a schematic structural view of the curved plate follow-up material supporting device of the present invention;

fig. 2 is a schematic view of the working state of the bent plate follow-up material supporting device of the present invention, and the state of bending different positions of the plate material;

FIG. 3 is a view of the working state of two bending plate follow-up material supporting devices in cooperation for bending a plate material;

FIG. 4 is a working state diagram of two bending plate follow-up material supporting devices matched with a bending plate material when the plate material is to be taken;

FIG. 5 is a schematic view of the state of the bent plate follow-up material supporting device after the plate material is bent and when the plate material is to be taken out;

FIG. 6 is a schematic diagram of a hydraulic system of the bent plate follow-up material supporting device of the present invention;

fig. 7 is a control logic diagram of a hydraulic system of the bent plate follow-up material supporting device.

In the figure: 100. a base; 110. a lower slide base; 120. a lower chute; 130. a limit switch; 140. a variable speed proximity switch; 200. an active strut; 300. a driven strut; 400. a material supporting plate; 410. an upper slide base; 420. an upper chute; 430. a sensor; 440. an electromagnet; 500. a drive cylinder;

600. a hydraulic system; 610. an oil tank; 620. an oil supply part; 621. a main oil pump; 622. a sequence valve; 623. a main electromagnetic spill valve; 624. an auxiliary oil pump; 625. a secondary electromagnetic spill valve; 630. a three-position four-way reversing valve; 640. a two-position four-way reversing valve; 650. a one-way throttle valve.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

Example 1

As shown in fig. 1, the embodiment provides a bent plate follow-up material supporting device, which is mainly applied to bent plate equipment such as a bending machine, and is used for supporting a plate material in a bending process so as to ensure bending precision and surface quality of the plate material, and is especially important for large-sized and thin-sized plate materials. The main body of the device mainly comprises a base 100, a driving supporting rod 200, a driven supporting rod 300, a retainer plate 400 and a driving cylinder 500, and forms a connecting rod overturning supporting structure.

Specifically, the base 100 serves as an installation foundation of the whole device, the base can be directly arranged on the ground or fixedly arranged on the ground, a pit is formed in the ground below the base, the cylinder barrel of the driving cylinder 500 is hinged to the base 100, and the lower half portion of the cylinder barrel extends into the pit, so that the occupied area is reduced, and the overall height of the device is favorably reduced.

The driving strut 200 and the driven strut 300 are identical in appearance and are connected in a cross mode, the middle of the driving strut 200 is hinged to the middle of the driven strut 300, and the hinged point is deviated to one side. The lower end of the active strut 200 is hinged to the left end of the base 100, and the upper end thereof is movably disposed in the lower chute 120 of the lower slider 110 on the base 100, as viewed in fig. 1. The driven strut 300 is connected in a similar manner to the driving strut 200, that is, the driven strut 300 has an upper end hinged to the left end of the retainer plate 400 and a lower end movably disposed in an upper chute 420 of an upper slide 410 located at the lower side of the right end of the retainer plate 400. And the driving end of the piston rod of the driving cylinder 500 is hinged to the driving strut 200, and the hinge point is located between the hinge point of the driving strut 200 and the driven strut 300 and the connection point of the driving strut 200 and the upper sliding seat 410.

Compared with the existing multi-connecting-rod structure with complex material supporting structure, high requirements on space occupation, manufacturing cost and precision, high installation difficulty and poor rigidity, the bent plate follow-up material supporting device can realize the overturning action of the material supporting plate 400 only by the driving supporting rod 200 and the driven supporting rod 300, the structure is greatly simplified, the manufacturing cost and the precision are greatly reduced, the installation difficulty is extremely low, the structure is compact, and the occupied space is small; and the cross supporting mode of the main supporting rod and the auxiliary supporting rod has stronger structural rigidity, can support large thick plates along with the main supporting rod, has the material supporting force as high as 1000kg, and greatly improves the bearing capacity.

In order to make the device more compact and reduce the overall height, both ends of the driving strut 200 and both ends of the driven strut 300 are bent in opposite directions, so that the hinge point of the driving strut and the driven strut is deviated towards one end, a longer moment arm distance is provided for the driving cylinder 500, and the bearing force is increased; more importantly, the retainer plate 400 can be prevented from being turned downwards to the lower limit position to generate interference and can be turned downwards to the horizontal placement position.

In order to realize reliable movable matching between the driving strut 200 and the lower chute 120 and between the driven strut 300 and the upper chute 420, an upper roller is installed at the end of the driving strut 200 matched with the lower chute 120 of the lower slide block 110, and the upper roller can roll and translate along with the turning of the driving strut 200 in the lower chute 120, so as to meet the requirement of degree of freedom. Similarly, a lower roller is installed at one end of the driven strut 300 matched with the upper chute 420 of the upper sliding seat 410, and the lower roller can roll and translate along with the overturn of the driven strut 300 in the upper chute 420, so that the requirement of degree of freedom is met. The rollers on the main supporting rod and the auxiliary supporting rod can realize self rotation, simultaneously can roll and translate along the sliding groove to finish composite motion, the retainer plate 400 can be controlled to finish overturning action only by adopting two supporting rods in ingenious realization, and friction is reduced.

Because the bending process of the plate is complex, the plate cannot be completely attached to the surface of the retainer plate 400 in the whole bending process, and the plate can be found and compensated in time when being separated from the retainer plate 400. Therefore, in the embodiment, the sensor 430 for detecting whether the sheet material is separated from the supporting surface of the supporting plate 400 is installed on the upper side of the supporting plate, once the sheet material is separated, the sensor can sense the separation and transmit a signal to the electric control system, so that the action of the driving cylinder 500 is controlled, the attachment is recovered in a very short time, and the following high reliability is ensured.

On the basis of the scheme, limit switches 130 are arranged at the left end and the right end of the lower chute 120 corresponding to the upper-lower overturning limit positions of the retainer plate 400, so that the upper-lower overturning angle of the retainer plate 400 can be controlled, and safety protection is realized. Meanwhile, the bent plate is dangerous to fall, in order to reduce potential safety hazards, a variable speed proximity switch 140 is arranged in the lower sliding groove 120 and close to a limit switch 130 corresponding to the lower overturning limit position of the retainer plate 400, the retainer plate 400 falls rapidly before overturning downwards and touching the variable speed proximity switch 140, and the variable speed proximity switch 140 is touched and then falls slowly until reaching the horizontal position.

In addition, the bent plate is often clamped on two sides of the workbench, in order to facilitate taking out the plate after the plate is bent, at least one electromagnet 440 which does not protrude out of the surface of the plate is arranged in a groove in the upper side surface of the retainer plate 400, and the bent plate can be adsorbed on the surface of the retainer plate 400, so that the position and the posture of the plate can be adjusted, and the plate can be taken out from the most convenient position.

In order to keep the supporting device to turn over well along with the plate and ensure good supporting material following performance in the plate bending process, the scheme adopts the using method for operating the bending plate following supporting device, the device is arranged on the front side or the rear side of a workbench of a bending machine, and the bending machine is matched with the bending machine to complete the following operation steps in the bending operation process:

firstly, as shown in fig. 2 and 3, when the bending machine bends a sheet, the sheet is propped against the upper surface of the retainer plate 400, and as the bending proceeds, the driving cylinder 500 drives the driving support rod 200 to rotate to drive the retainer plate 400 to turn upwards, so that the sheet is supported and attached to the upper surface of the retainer plate 400. In this step, when the sensor 430 senses that the sheet material is slightly separated from the upper surface of the retainer plate 400, a sensing signal is immediately sent to the electronic control system, and the electronic control system controls the hydraulic system, so that the driving cylinder 500 drives the retainer plate 400 to overturn quickly, and the sheet material is attached and supported, thereby ensuring the attachment of the sheet material in the whole bending process.

Secondly, as shown in fig. 4 and 5, when the plate is bent and taken out, the driving cylinder 500 drives the driving support rod 200 to rotate to drive the retainer plate 400 to turn downwards, and the plate gradually separates from the upper surface of the retainer plate 400 to vacate a material taking space. In the material taking process, when the plate material is required to be prevented from being separated from the surface of the material supporting plate 400, the electromagnet 440 is electrified, and the plate material is adsorbed and tightly attached to the surface of the material supporting plate 400, so that the position and posture of the plate material are conveniently adjusted, and the bent plate material can be taken out. Especially, when the lighter side needs to be turned down and the heavier side needs to be turned up, the electromagnet 440 is very convenient to act.

When the retainer plate 400 is overturned to the limit position, the driven support rod 300 is sensed by the limit switch 130, and the driving cylinder 500 stops acting, so that the safety protection effect is achieved; when the driven supporting rod 300 is sensed by the variable-speed proximity switch 140, the stretching speed of the driving cylinder 500 is changed, and the overturning speed of the retainer plate 400 is adjusted, so that the danger of smashing down a heavy object is avoided, the blanking time is greatly saved, and the working efficiency is effectively improved.

In practical use, the bending plate follow-up material supporting device can be independently adopted on the front side or the rear side of the workbench of the bending machine, and the bending plate follow-up material supporting devices can be arranged on the front side and the rear side as required and are symmetrical on the two sides, so that the plate can be comprehensively supported and protected, and the bending precision is ensured.

Example 2

The foregoing embodiment provides a mechanical structure capable of implementing the plate bending following device, but the reliable following action of the mechanical part and other turning actions are required to be completed by accurate control, and therefore, the embodiment provides the plate following material supporting hydraulic system 600 on the basis of the mechanical structure of the plate bending following material supporting device to control the extension and retraction of the driving cylinder 500 to meet the requirement of the turning action. Meanwhile, the problems of high requirement and poor reliability of a follow-up tracking material supporting control system of the conventional bending machine are solved.

As shown in fig. 6, the bending plate follow-up material supporting hydraulic system 600 is composed of an oil tank 610, a material supporting control part and an oil supply part 620. Wherein, the oil inlet side of the oil supply part 620 is connected with the oil tank 610, one end of the material supporting control part is connected with the oil outlet side of the oil supply part 620, and the other end of the material supporting control part is connected with the driving cylinder 500. The oil supply part 620 supplies pressure oil to the driving cylinder 500 and controls the flow rate and flow rate of the hydraulic oil, and the material holding control part controls the telescopic motion of the driving cylinder 500.

Specifically, the oil supply portion 620 includes a main oil pump 621, a sequence valve 622, and a main electromagnetic spill valve 623. Wherein, the oil inlet end of the main oil pump 621 is connected with the oil tank 610, and the oil outlet end is connected with the P port of the three-position four-way reversing valve 630 through a one-way valve; the sequence valve 622 is connected between the oil outlet end of the main oil pump 621 and the oil tank 610; the main electromagnetic overflow valve 623 is connected between the port P of the three-position four-way reversing valve 630 and the oil tank 610. The main oil pump 621 provides main pressure oil for the system, and the main electromagnetic overflow valve 623 plays roles in constant-pressure overflow, pressure stabilization, system unloading and safety protection; the sequence valve 622 controls the flow of the pressure oil of the main oil pump 621, and the set pressure makes the driving cylinder 500 drive the retainer plate 400 to just lift the plate but not to jack the plate, so that the plate is always tightly attached to the surface of the retainer plate 400.

In order to ensure the following reliability of the retainer plate 400 in the bending process of the plate material, an auxiliary oil pump 624 is added into the oil supply part 620, namely the oil supply part 620 further comprises the auxiliary oil pump 624 and an auxiliary electromagnetic overflow valve 625. The oil inlet end of the auxiliary oil pump 624 is connected with the oil tank 610, and the oil outlet end is connected with the P port of the three-position four-way reversing valve 630 through another one-way valve; an auxiliary electromagnetic overflow valve 625 is connected between an oil outlet of the auxiliary oil pump 624 and the oil tank 610; the relief pressure of main electromagnetic relief valve 623 is greater than the electromagnetic pressure of sub electromagnetic relief valve 625. When the main oil pump 621 cannot guarantee that the retainer plate 400 can closely follow the bending speed of the plate, the auxiliary oil pump 624 can be controlled to intervene to work, flow supplement is carried out, the overturning speed of the retainer plate 400 is increased, the speed difference is eliminated, and the following reliability is guaranteed.

Meanwhile, in order to adjust the pose of the plate after bending so as to take out the plate from the bending machine, the driving cylinder 500 adopts a telescopic hydraulic cylinder, a large piston rod extends in place, and a small piston rod can continue to extend under the action of the auxiliary oil pump 624 so as to turn over the plate at a large angle further, so that the position can be adjusted. And the two material supporting control parts are respectively connected with a driving cylinder 500, and the front side and the rear side of the workbench of the bending machine are used for supporting the plate, so that the bending stability of the plate is further improved, the surface quality of the plate is also ensured, and the position and the posture of the plate are more conveniently adjusted.

The material holding control part comprises a three-position four-way reversing valve 630 and a two-position four-way reversing valve 640. Wherein, the P port of the three-position four-way reversing valve 630 is connected with the oil outlet side of the oil supply part 620, the T port is connected with the oil tank 610, and the A port and the B port are respectively connected with the rod cavity and the rodless cavity of the driving cylinder 500; one oil port of the two-position four-way reversing valve 640 is connected with the rodless cavity of the driving cylinder 500, the T port of the two-position four-way reversing valve is connected with the oil tank 610, and the other two oil ports are closed. The hydraulic system controls the extension and retraction of the driving cylinder 500 through the three-position four-way reversing valve 630, and then drives the retainer plate 400 to turn up and down, so that the following and discharging of plate bending are realized.

In addition, the safety of the bent plate needs to be guaranteed during discharging, so the material supporting control part further comprises a one-way throttle valve 650, and the one-way throttle valve 650 is arranged between the port B of the three-position four-way reversing valve 630 and the rodless cavity of the driving cylinder 500. Wherein the opening direction of the check valve flows from the three-position four-way reversing valve 630 to the driving cylinder 500. The intervention time of the one-way throttle valve 650 is controlled by the two-position four-way reversing valve 640, so that the material can be quickly discharged after being bent, and is slowly and stably discharged when the material is close to the horizontal level, the danger of smashing down the heavy object is avoided, the blanking time is greatly saved, and the working efficiency is effectively improved.

Of the valves used above, the left and right electromagnets of the three-position four-way selector valve 630 that controls the bender table front drive cylinder 500 are denoted YV1 and YV2, respectively, and the electromagnet corresponding to the two-position four-way selector valve 640 is denoted YV 3; the left and right electromagnets of the three-position four-way reversing valve 630 controlling the rear driving cylinder 500 of the bending machine workbench are respectively represented as YV4 and YV5, and the electromagnet corresponding to the two-position four-way reversing valve 640 is represented as YV 6; the electromagnet of main electromagnetic spill valve 623 is denoted YV 7; the electromagnet of sub electromagnetic spill valve 625 is denoted by YV 8.

The bent plate follow-up material supporting hydraulic system is adopted, an electric control system is matched to control the bent plate follow-up material supporting device to mechanically work, the overturning action of the material supporting plate 400 in the bending operation of the plate is controlled in a complex and accurate mode, and a control time sequence table can be shown in fig. 7.

The following control of the retainer plate 400 in the hydraulic system control operation will be described, and the following control method includes:

when a plate is bent, the three-position four-way reversing valve 630 is positioned at the right position, the port P is communicated with the port B, and the port A is communicated with the port T; the two-position four-way reversing valve 640 is at the left position and is closed; the main electromagnetic overflow valve 623 is powered; the main oil pump 621 of the oil supply part 620 works, pressure oil enters a rodless cavity of the driving cylinder 500 through the three-position four-way reversing valve 630, and the retainer plate 400 is driven to turn upwards along with the plate; excess pressurized oil is returned to the tank 610 through the sequence valve 622. In this step, when the turning speed of the retainer plate 400 cannot keep up with the bending speed of the plate material and the plate material is separated from the surface of the retainer plate 400, the sensor 430 generates an induction signal, and the electric control system controls the auxiliary electromagnetic overflow valve 625 to be powered on; the main oil pump 621 and the auxiliary oil pump 624 work simultaneously to increase the overturning speed of the retainer plate 400, so that the retainer plate 400 can keep up with the bending speed of the plate, and the retainer plate 400 can be ensured to support the plate all the time.

When the plate materials are bent and discharged, the three-position four-way reversing valve 630 is reversed to be in the left position, the port P is communicated with the port A, and the port B is communicated with the port T; the two-position four-way reversing valve 640 is in the right position in a reversing mode, the rodless cavity of the driving cylinder 500 is communicated with the oil tank 610, and pressure oil enters the rodless cavity of the driving cylinder 500 through the three-position four-way reversing valve 630 and drives the retainer plate 400 to turn downwards. In this step, when the discharge is close to the end sound and the retainer plate 400 needs to be slowly turned downwards, the driven support rod 300 is close to the switch 140 by the pole change speed, and the electric control system controls the two-position four-way reversing valve 640 to be reversed to be in the left position and is stopped; the hydraulic oil in the rodless cavity of the driving cylinder 500 is limited by the one-way throttle valve 650 and then returns to the oil tank 610 through the three-position four-way reversing valve 630, so that the danger of smashing down a heavy object is avoided, the blanking time is greatly saved, and the working efficiency is effectively improved.

When the position of the plate needs to be adjusted to conveniently take out the plate after bending, the driving cylinders 500 on the two sides can respectively control one side of the material supporting plates 400 in front of and behind the workbench to turn upwards and one side to turn downwards, and after the plate is erected, the material supporting plates 400 on the two sides are put down again, so that the plate can be taken out. For the plate bending follow-up material supporting device arranged on only one side, the electromagnet 440 can be electrified to adsorb the surface of the plate material when the position and the posture are adjusted, so that the position and the posture of the plate material can be reliably turned and adjusted, and the plate material is prevented from falling off. At this time, the driving cylinder 500 preferably adopts a telescopic hydraulic cylinder, has a long working stroke, and generally only needs the main oil pump 621 to work and the primary piston rod extends out during normal bending operation; after the bending, the pose is adjusted so that when the plate is taken out, the auxiliary oil pump 624 is involved in working, the oil supply pressure is increased, the secondary piston rod extends out, and the turning angle is increased so that the plate can be erected.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (10)

1. A bending machine with a plate bending follow-up control function is characterized in that a bending plate follow-up material supporting device is arranged on the front side and/or the rear side of a workbench of the bending machine; the bent plate follow-up material supporting device controls actions through a hydraulic system (600), and is characterized in that:

the bent plate follow-up material supporting device comprises a base (100), a driving support rod (200), a driven support rod (300), a material supporting plate (400) and a driving cylinder (500); the middle part of the driving support rod (200) is hinged with the middle part of the driven support rod (300); one end of the active support rod (200) is hinged on the base (100), and the other end of the active support rod is movably arranged in a lower sliding groove (120) of an upper sliding seat (110) and a lower sliding seat (110) of the base (100); one end of the driven support rod (300) is hinged to one end of the retainer plate (400), and the other end of the driven support rod is movably arranged in an upper chute (420) of an upper sliding seat (410) positioned on the lower side of the other end of the retainer plate (400); the driving cylinder (500) is hinged to the base (100), the driving end of the driving cylinder is hinged to the driving support rod (200), and the hinged point is located between the hinged point of the driving support rod (200) and the driven support rod (300) and the connecting point of the driving support rod (200) and the upper sliding seat (410);

the hydraulic system (600) comprises an oil tank (610), a material supporting control part and an oil supply part (620), wherein the oil inlet side of the oil supply part (620) is connected with the oil tank (610); the oil inlet end of the material supporting control part is connected with the oil outlet side of the oil supply part (620), and the oil inlet end of the material supporting control part comprises a three-position four-way reversing valve (630) and a two-position four-way reversing valve (640); the P port of the three-position four-way reversing valve (630) is connected with the oil outlet side of the oil supply part (620), the T port of the three-position four-way reversing valve is connected with an oil tank (610), and the A port and the B port of the three-position four-way reversing valve are respectively connected with a rod cavity and a rodless cavity of the driving cylinder (500); one oil port of the two-position four-way reversing valve (640) is connected with the rodless cavity of the driving cylinder (500), the T port of the two-position four-way reversing valve is connected with the oil tank (610), and the other two oil ports are closed.

2. The bending machine with plate bending follow-up control function according to claim 1, characterized in that: both ends of the driving strut (200) and both ends of the driven strut (300) are bent in opposite directions; an upper roller is arranged at one end of the driving support rod (200) matched with the lower sliding groove (120) of the lower sliding seat (110), and the upper roller can roll and translate along with the overturning of the driving support rod (200) in the lower sliding groove (120); the lower roller is installed at one end, matched with the upper sliding groove (420), of the upper sliding seat (410) of the driven support rod (300), and the lower roller can roll and translate along with the overturning of the driven support rod (300) in the upper sliding groove (420).

3. The bending machine with plate bending follow-up control function according to claim 2, characterized in that: a sensor (430) for detecting whether the plate material is separated from the material supporting surface of the material supporting plate (400) is arranged on the upper side surface of the material supporting plate; at least one electromagnet (440) which does not protrude out of the surface of the retainer plate (400) is arranged in the groove on the upper side surface of the retainer plate.

4. The bending machine with plate bending follow-up control function according to claim 2, characterized in that: limit switches (130) are arranged at the left end and the right end of the lower chute (120) corresponding to the upper and lower overturning limit positions of the retainer plate (400); a variable-speed approach switch (140) is arranged in the lower chute (120) and close to a limit switch (130) corresponding to the lower overturning limit position of the retainer plate (400).

5. The bending machine with plate bending follow-up control function according to any one of claims 1 to 4, characterized in that: the material supporting control part also comprises a one-way throttle valve (650); the one-way throttle valve (650) is arranged between the port B of the three-position four-way reversing valve (630) and a rodless cavity of the driving cylinder (500), wherein the opening direction of the one-way valve flows from the three-position four-way reversing valve (630) to the driving cylinder (500).

6. The bending machine with plate bending follow-up control function according to claim 5, characterized in that: the oil supply portion (620) includes a main oil pump (621) and a sequence valve (622); the oil inlet end of the main oil pump (621) is connected with an oil tank (610), and the oil outlet end of the main oil pump is connected with a P port of the three-position four-way reversing valve (630) through a one-way valve; the sequence valve (622) is connected between the oil outlet end of the main oil pump (621) and an oil tank (610).

7. The bending machine with plate bending follow-up control function according to claim 6, characterized in that: the oil supply part (620) further comprises a main electromagnetic overflow valve (623); and the main electromagnetic overflow valve (623) is connected between the port P of the three-position four-way reversing valve (630) and the oil tank (610).

8. The bending machine with plate bending follow-up control function according to claim 5, characterized in that: the oil supply part (620) further comprises an auxiliary oil pump (624) and an auxiliary electromagnetic overflow valve (625); the oil inlet end of the auxiliary oil pump (624) is connected with the oil tank (610), and the oil outlet end of the auxiliary oil pump is connected with the P port of the three-position four-way reversing valve (630) through another one-way valve; the auxiliary electromagnetic overflow valve (625) is connected between an oil outlet of the auxiliary oil pump (624) and the oil tank (610).

9. The bending machine with plate bending follow-up control function according to claim 8, characterized in that: the driving cylinder (500) is a telescopic hydraulic cylinder.

10. The bending machine with plate bending follow-up control function according to claim 9, characterized in that: the front side and the rear side of the workbench are both provided with bent plate follow-up material supporting devices; the material supporting control part is provided with two driving cylinders (500) which are respectively connected with the front and the rear bent plate follow-up material supporting devices.

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