WO2022007364A1

WO2022007364A1 - Lifting mechanism for tabletop hemming machine based on sectional control principle

Info

Publication number: WO2022007364A1
Application number: PCT/CN2020/141453
Authority: WO
Inventors: 刘蕾; 方晨程; 李骥国; 何伟
Original assignee: 安徽巨一科技股份有限公司
Priority date: 2020-07-08
Filing date: 2020-12-30
Publication date: 2022-01-13
Also published as: CN111974854A

Abstract

A lifting mechanism for a tabletop hemming machine based on a sectional control principle, comprising a base (7), a lifting block (8), a lead screw (9), a left wedge block (10), a right wedge block (11), and a motor (14). The lead screw (9) is rotatably provided on the base (7), and has a levorotation thread section matching the left wedge block (10) and a dextrorotation thread section matching the right wedge block (11); the lifting block (8) has two bottom slopes (83) which are symmetrically arranged; the two bottom slopes (83) match the left wedge block (10) and the right wedge block (11), respectively; each bottom slope (83) comprises a pre-hemming surface (831) and a final hemming surface (833) at the two ends, and a quick stroke surface (832) in the middle; the slope of the quick stroke surface (832) is greater than the slope of the pre-hemming surface (831) and the final hemming surface (833).

Description

A Lifting Mechanism of Desk-type Hemming Machine Based on Segmentation Control Principle

technical field

The invention relates to the field of sheet metal processing equipment, in particular to a table-type hemming machine jacking mechanism based on a segmented control principle.

Background technique

In recent years, with the continuous development of the domestic automobile industry, the automobile modeling has become more and more complicated, which has spawned new problems such as large angles and special-shaped hemming.

The four doors and two covers of an automobile are an important part of the automobile body assembly. The four doors and two covers belong to the exterior parts of the automobile body and have extremely high requirements on appearance and quality. At the same time, with the diversification of models and the high speed of production, the Due to its high rhythm and stable quality, the hemming machine can better deal with such problems.

At present, traditional hemming machines mostly use hydraulic and motor-driven forms.

The use of hydraulic transmission technology is mature and widely used in construction machinery and large presses. It is characterized by large output force and small size of actuators, but its shortcomings are also obvious: high energy consumption, high noise, high pollution, and low position and pressure control accuracy. etc., among which the disadvantage of high energy consumption is especially contrary to the current mainstream policy of energy conservation and emission reduction.

The motor-driven hemming machine is divided into servo motor drive and ordinary motor drive. The hemming machine using ordinary motor usually realizes its motion trajectory by a link mechanism or a cam mechanism. The control of the hemming position is generally performed by installing The induction switch on the motor shaft realizes its start and stop, the position control accuracy is poor, and the stop or acceleration and deceleration of any stroke cannot be freely realized, which is not conducive to the debugging of the equipment and the quality assurance.

For example, a hemming device and method disclosed in US20080302161A1, its lifting mechanism mainly uses a cylinder, a connecting rod, and a cam mechanism to realize the reciprocating lifting function. The structure is relatively complex, the load that can be tolerated is relatively small, and it is difficult to control the lifting stroke. , poor stability.

Patent CN203265351U discloses a car door hemming machine, which converts the motor output torque into the forward thrust of the nut seat through the ball screw. At the same time as the third connecting rod rotates around the fulcrum, the first connecting rod and the fifth connecting rod are respectively pushed to rotate around their fulcrum on the main frame, and the force increasing process is completed through the force increasing hinge composed of the second connecting rod and the third connecting rod, that is, the ball screw and the The multi-link mechanism is used to realize the thrust of the hemming and act on the pressing mechanism, but the load range that the structure can bear is small and the stability is poor.

SUMMARY OF THE INVENTION

In order to overcome the defects of the prior art, the purpose of the present invention is to provide a table top hemming machine jacking mechanism based on the segmented control principle, so as to overcome the problems of low position and pressure control precision of the jacking mechanism in the prior art.

To this end, the present invention proposes a table top hemming machine jacking mechanism based on a segmented control principle, including a base, a jacking block, a lead screw, a left wedge block, a right wedge block, and a motor; the lead screw It is rotatably arranged on the base, and has a left-handed thread segment matched with the left wedge block and a right-handed thread segment matched with the right wedge block; the lifting block has a symmetrically arranged bottom slope, two segments The bottom slopes are respectively matched with the left wedge block and the right wedge block.

The left wedge-shaped block and the right wedge-shaped block are provided with rollers; the bottom slope is divided into three sections, including the pre-wrapped edge surface at both ends, the final edge-wrapped surface, and the middle rapid stroke surface. The inclination of the travel surface is greater than the inclination of the pre-edge surface and the final edge surface.

Further, a guide rail plate is provided on the front side of the bottom slope of the jacking block, and the guide rail plate is a three-section guide rail for contacting the roller.

Further, the three-segment guide rail includes a pre-wrapping guide rail, a quick-stroke guide rail and a final hemming guide rail, and the inclination angles of the pre-wrapping guide rail and the final hemming guide rail are respectively the same as those of the pre-wrapping surface, The inclination angles of the final hemming surfaces are correspondingly the same; the advantages of the above design are that when the rollers are in contact with the fast travel guide rails, the lifting block can be raised and lowered quickly; when the lifting block and the left wedge block are in contact . When the right wedge-shaped block is in contact, the lifting block load can be lifted and lowered, that is, the left and right wedge-shaped blocks can bear a large load and lift the lifting block to meet the load requirement of hemming.

Further, both sides of the lifting block are provided with lifting guide plates.

Further, the lifting guide plate is provided with a V-shaped groove, and the lifting block is provided with a V-shaped convex block matching the V-shaped groove.

Further, the upper end edges of the reinforced side walls on both sides of the lifting block are arc-shaped.

Further, an oil supply system is also included, and the oil supply system includes an oil pump and an oil pipe.

Further, a pressure sensor is provided at the connection between the jacking block and the load.

Further, the left wedge block and the right wedge block are respectively provided with nuts matched with the lead screw, the above design can meet the load requirements during hemming, and at the same time improve the service life of the wedge block, ensure and lead screw. Coordinated positioning accuracy and stability.

Compared with the prior art, the beneficial effects of the present invention:

The jacking mechanism of the table hemming machine based on the subsection control principle of the present invention provides the power source through the motor, and then drives the lead screw to the wedge block to realize the jacking function of the mechanism; and rollers, it can complete the rapid lifting during the no-load stroke, thereby improving the hemming cycle, and can also return to the lifting state that can withstand large loads during the heavy-load stroke, and the maximum load can reach 80 tons.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the structure schematic diagram of the desktop hemming machine based on the segmented control principle of the present invention;

Fig. 2 is the structural schematic diagram of the table top hemming machine jacking mechanism based on the segmented control principle of the present invention;

3 is a structural diagram of the cooperation between the lifting guide plate and the lifting block in the lifting drive mechanism of the present invention;

FIG. 4 is a structural diagram of the cooperation between the wedge block and the jacking block in the jacking drive mechanism of the present invention;

5 is a schematic structural diagram of a guide rail plate in the jacking drive mechanism of the present invention; and

6 is a cross-sectional view of the cooperation between the left wedge block and the lead screw in the jacking drive mechanism of the present invention.

Description of reference numerals

1. Lifting drive mechanism; 2. Tire mold base; 3. Hemming machine base; 4. Tire mold; 5. Pressing knife; 6. Pressing knife mounting seat; 7. Base; 8. Lifting block; 9 , lead screw; 10, left wedge block; 11, right wedge block; 12, guide rail plate; 13, pressure sensor; 14, motor; 15, roller; 16, lift guide plate; 17, oil pump; 18, drag chain; 81 , Reinforced side wall; 82, V-shaped bump; 83, Bottom slope; 831, Pre-wrapped edge surface; 832, Quick stroke surface; 833, Final edge-wrapped surface; 101, Nut; 121, Pre-wrapped guide rail; 122, Quick travel guide rail; 123, final edge wrapping guide rail; 161, V-groove.

detailed description

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

1-6 illustrate some embodiments in accordance with the present invention.

As shown in FIG. 1 , the desktop hemming machine based on the segmented control principle includes a jacking drive mechanism 1 , a tire mold base 2 , a hemming machine base 3 , a tire mold 4 , a press knife mount 6 , and a press knife 5 .

The car door cover is fixed on the tire mold 4, the tire mold 4 is fixedly connected with the tire mold base 2, and the jacking drive mechanism 1 drives the movable mechanism composed of the tire mold 4 and the tire mold base 2 to move up and down.

There is a ring of press knives 5 around the tire mold 4, and the press knife 5 is fixed on the press knife mounting seat 6. When the lifting drive mechanism 1 drives the movable mechanism composed of the tire mold 4 and the tire mold base 2 to move upward, the press knife 5 will move upward. The flanging of the plate is bent to complete the hemming process.

As shown in FIG. 2 , the jacking drive mechanism includes a base 7 , a jacking block 8 , a lead screw 9 , a left wedge block 10 , a right wedge block 11 , and a motor 14 , wherein the motor 14 is a servo motor, and the lead screw 9 is a Ball screw; the base 7 is a casting with a certain rigidity, and there are bearing holes at both ends for installing the screw 9. The screw 9 is driven by the servo motor 14, and the servo motor 14 is connected to the base 7 through the flange. , the lead screw 9 passes through the hollow shaft on the servo motor 14 and is connected to its transmission. The servo motor is equipped with a servo driver, which can precisely control its parameters such as speed and output torque.

Wherein, as shown in FIG. 6 , the lead screw 9 has a left-hand thread segment matched with the left wedge block 10 and a right-hand thread segment matched with the right wedge block 11 , and the lead screw 9 is equipped with left-hand and right-hand threads. Two nuts 101, the left-hand nut is installed in the left wedge block 10, and the right-hand nut is installed in the right wedge block 11. When the lead screw 9 is rotated under the drive of the motor 14, the left and right nuts drive the left wedge block 10 and the right The wedge blocks 11 move towards each other or in the opposite direction. Among them, the lead screw 9 is a ball screw, which has the characteristics of high positioning accuracy and small resistance during operation.

The upper parts of the left wedge block 10 and the right wedge block 11 are both inclined wedge sliders, and the inclination directions of the two are symmetrically arranged; The angle is the same as the left wedge block 10 and the right wedge block 11. When the jacking block 8 falls on the left wedge block 10 and the right wedge block 11, the bottom of the jacking block 8 can be inclined with the left wedge block 10 and the right wedge block 11. The surfaces are completely fitted; when the lead screw 9 rotates under the drive of the motor 14, the left and right wedge block 10 and the right wedge block 11 are driven by the left and right wedge blocks to move in opposite directions or in opposite directions, thereby driving the jacking block 8 to move vertically up and down. .

Detachable nuts are arranged in the left wedge block 10 and the right wedge block 11, which can meet the load requirements during hemming, improve the service life of the wedge block, and ensure the positioning accuracy and stability of the lead screw.

Specifically, as shown in FIG. 2 , in order to reduce the overall size of the mechanism, the present invention is designed with a rapid travel mechanism, which includes a guide rail plate 12 and a roller 15 .

As shown in FIGS. 4 and 5 , the two-stage bottom slope 83 of the jacking block 8 is designed as a three-stage type, and the bottom slope 83 includes a pre-wrapping surface 831 , a quick stroke surface 832 , a final wrapping surface 833 , and a pre-wrapping surface 831 And the final wrapping surface 833 is the inclined surface of the two key stress (pre wrapping and final wrapping).

A guide rail plate 12 is added to the front side of the jacking block 8, and the guide rail plate 12 also has two symmetrical three-section guide rails. The inclination of the quick travel guide rail 122 in the middle of the plate 12 is greater than that of the pre-wrapping guide rails 121 and the final hemming guide rails 123 at both ends of the guide rail plate 12, while the pre-wrapping guide rails 121 and the final hemming guide rails 123 at both ends of the The inclination is the same as the inclination of the pre-binder surface 831 and the final edge surface 833 of the jacking block 8 .

As shown in FIG. 2, the roller 15 is installed on the left wedge block 10 and the right wedge block 11. When the roller 15 follows the left and right wedge blocks to move to the fast travel guide rail 122, the jacking block 8 can be quickly lifted up to complete the emptying. In the rapid feed of the stroke, when the roller 15 is separated from the rapid stroke guide rail 122, the bottom surface of the jacking block 8 contacts the wedge block and receives force, and returns to a state that can bear a large load.

When the load of the free-travel system is small, the roller 15 is in contact with the fast-travel guide rail to realize the rapid lifting and lowering of the jacking block; during pre-edge and final edge-wrapping, the bottom of the lifting block and the wedge block are contacted and stressed to withstand large load pressures , to realize the lifting movement of the lifting block. Through the design of the fast stroke structure, the hemming cycle can be improved.

In one embodiment, as shown in Figures 3 and 4, two lifting guide plates 16 are provided on both sides of the jacking block 8, the lifting guide plates 16 are fixedly connected with the base 7, and the inner side of the lifting guide plate 16 has The V-shaped groove 161 is correspondingly designed with a V-shaped protrusion 82 on the lifting block 8 . The V-shaped protrusion 82 cooperates with the V-shaped groove 161 to achieve a guiding effect when the lifting block 8 moves up and down.

In one embodiment, as shown in FIGS. 2 and 4 , in order to improve the structural strength of the jacking block 8 and prevent the stress concentration of the jacking block 8 from occurring, the upper ends of the reinforcing side walls 81 on the front and rear sides of the jacking block 8 are arc-shaped. When the left wedge block 10 and the right wedge block 11 push the jacking block 8 to move upward, the reinforcing rib on the upper end of the jacking block 8 can disperse the force of the left wedge block 10 and the right wedge block 11 on it, reducing the lifting force. Stress concentration occurs on the upper end face of the lifting block 8 , thereby improving the service life of the lifting block 8 .

In one embodiment, as shown in FIG. 1 , in order to improve the operating environment of the lead screw 9, the present invention designs an oil supply system including an oil pump 17, an oil pipe, and a drag chain 18; On the left and right nuts, by setting a program, the oil pump 17 can be controlled to pump oil into the nuts regularly to improve their lubrication and prolong their service life.

In one embodiment, as shown in Fig. 1, in order to precisely control the force output of the system, the present invention uses a pressure sensor 13, which is located at the connection between the jacking mechanism and the load, and can feedback the current force output value of the system in real time, and It is fed back to the control system and connected with the servo encoder signal in the control system to realize closed-loop control based on pressure.

In one embodiment, the drive and position control of the system are realized by using a common motor plus a stop switch and a hydraulic motor to replace the servo motor in the above embodiment, and the corresponding drive function can also be realized.

In an embodiment, by using a trapezoidal screw or a planetary screw to replace the ball screw in the above embodiment, the movement of the two wedge-shaped sliders can be realized by a left-right trapezoidal screw or a planetary screw, and the corresponding Among them, the advantages of planetary screw and ball screw are that they can provide rated dynamic and static load higher than that of ball screw. Replacing the ball with thread will quickly release the load through many contact lines, so that there can be higher Shock resistance.

In one embodiment, the roller is installed on the jacking block, and the guide rail plate is designed on the wedge-shaped slider. The guide rail plate 12 cooperates with the roller 15 to complete the rapid lifting stroke. When the roller 15 follows the left and right wedge blocks to move to a large When the angle is inclined, the jacking block 8 can be quickly lifted to complete the rapid feeding of the empty stroke. When the roller 15 is separated from the large-angle inclined plane, the bottom surface of the jacking block 8 and the slope of the wedge block are re-contacted and restored to A state that can withstand heavy loads.

In addition to the above beneficial effects, the present invention also has the following characteristics:

1. The power source of the drive mechanism of the present invention is provided by a servo motor, which has low noise, no pollution, low energy consumption, fast response speed, flexible debugging and high control precision; the transformation of motion is completed by a ball screw, and its mechanical efficiency can reach 95% Above, the transmission efficiency is high.

2. The force-enhancing mechanism composed of a ball screw and a wedge-shaped slider can amplify the torque generated by the motor several times to the terminal position. , can also be used on other presses as a power source.

3. The sensor system composed of pressure sensors and servo encoders can sense the displacement of moving parts and system force output in real time, and can realize a closed-loop control system controlled by pressure-displacement, which can accurately control the system displacement and output pressure, while the displacement Control accuracy is usually determined by encoder accuracy and system transmission efficiency.

4. Due to the design of rapid stroke, when the load of the idle stroke system is small, the rollers and the rapid stroke guide rails are in contact to realize the rapid feeding of the jacking block and improve the production tact; The wedge-shaped block restores surface contact to withstand large load pressures. This design can greatly reduce the size of the mechanism and cycle time, and can also meet the system force requirements under different loads.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

A jacking mechanism for a table top hemming machine based on a segmented control principle, characterized in that it comprises a base (7), a jacking block (8), a lead screw (9), a left wedge block (10), a right wedge a block (11), and a motor (14);

The lead screw (9) is rotatably arranged on the base (7), and has a left-hand thread segment matched with the left wedge block (10) and a right-hand thread segment matched with the right wedge block (11). ; The lifting block (8) has two symmetrically arranged bottom slopes (83), and the two bottom slopes (83) are respectively connected with the left wedge block (10) and the right wedge block (11) cooperate;

The left wedge-shaped block (10) and the right wedge-shaped block (11) are provided with rollers (15); the bottom slope (83) is divided into three sections, including the pre-wrapping surfaces (831) at both ends, The final hemming surface (833), and the intermediate fast-travel surface (832), the inclination angle of the fast-travel surface (832) is greater than that of the pre-hemming surface (831) and the final hemming surface (833). slope.
The lifting mechanism of a desktop hemming machine based on a segmented control principle according to claim 1, wherein a guide rail plate (12) is provided on the front side of the bottom slope of the lifting block (8), and the guide rail The plate (12) is a three-section guide rail.
The lifting mechanism of a table top hemming machine based on a segmented control principle according to claim 2, wherein the three-segment guide rail comprises a pre-wrapping guide rail (121), a quick stroke guide rail (122) and a final wrapping guide rail (122). side guide rails (123), and the inclination angles of the pre-wrapping guide rails (121) and the final hemming guide rails (123) are respectively the same as the inclinations of the pre-wrapping hemming surfaces (831) and the final hemming surfaces (833). The angles correspond to the same.
The lifting mechanism of a desk-type hemming machine based on a segmented control principle according to claim 1, characterized in that, both sides of the lifting block (8) are provided with lifting guide plates (16).
The lifting mechanism of the table top hemming machine based on the segmented control principle according to claim 4, wherein the lifting guide plate (16) is provided with a V-shaped groove (161), and the lifting block is provided with a V-shaped groove (161). (8) is provided with a V-shaped bump (82) matching the V-shaped groove (161).
The lifting mechanism of a table top hemming machine based on a segmented control principle according to claim 1, characterized in that the upper end edges of the reinforced side walls (81) on both sides of the lifting block (8) are arc-shaped.
The table top hemming machine jacking mechanism based on the segmented control principle according to claim 1, further comprising an oil supply system, the oil supply system comprising an oil pump (17) and an oil pipe.
The jacking mechanism of a desk-type hemming machine based on a segmented control principle according to claim 1, characterized in that a pressure sensor (13) is provided at the connection between the jacking block (8) and the load.
The lifting mechanism of a table top hemming machine based on a segmented control principle according to claim 1, wherein the left wedge-shaped block (10) and the right wedge-shaped block (11) are respectively provided with The screw (9) is fitted with the nut (101).