WO2013107149A1 - Reinforcing device - Google Patents

Description

 Force increasing device

 The present application claims priority to Chinese Patent Application No. 20122002375, the entire disclosure of which is hereby incorporated by reference.

Technical field

 The present application relates to the field of power plant technology, and in particular, to a booster device.

Background technique

 In many cases, it is necessary to output a large amount of force (several tons, hundreds of tons to several thousand tons or even tens of tons) to complete a job, such as presses (mechanical presses, hydraulic presses, screw presses and flat presses, and presses). , straightening machine, shearing machine, forging manipulator), injection molding machine, static pile driver and friction welding machine. While the amount of force that the drive power source can provide is limited, some devices are needed to increase the force. The existing main power drive modes mainly include hydraulic and mechanical, and the mechanical type also includes servo type. Compared with the full hydraulic type, the hydraulic system is not used and all are realized by motor and mechanical structure. Energy saving and environmental protection, servo control technology Closed-loop control of parameters such as force, displacement, and speed can achieve high control accuracy, which is impossible to achieve with ordinary motor speed regulation. Its transmission characteristics are: servo motor + booster mechanism + transmission mechanism (spiral drive or disc drive) + booster mechanism + force-applying components. These boosting mechanisms include gear or belt deceleration, a screw mechanism, a toggle mechanism, and a crank-link mechanism.

 Among them, the crank-link mechanism has a wide range of applications because of its good motion law, simple structure, easy manufacture, and large force ratio. Here, the crank linkage mechanism is taken as an example.

 1 force ratio, as shown in Figure 1, ^^ set 4 dry BC force is F, the slider produces a pressure of Q. The slider and the rocker are taken as the research objects respectively, and the static and static moment balance equations can be obtained: Q*m /cosa=F*l

 Then the force ratio of the mechanism can be expressed as: i=Q/F=l*cosa/m

 ( 1 )

Where: i is the force ratio; m is the distance from the hinge D to the rod CE, mm;

 1 is the distance from the hinge D to the rod BC, mm;

 α is the angle between the rod CE and the slider guide DE.

 2 Mathematical model, as shown in Fig. 1, the dimensions related to the length of each member are a, b, c, d, e, f, and the rotation angles are Θ1, Θ2, Θ3, respectively, and the vector equation a + b + c= The projection of e + f in the horizontal and vertical directions is:

 JacosBl + bcos92=e + csin93

 LasinBl - bsin92=f - ccos93

 (2)

 Eliminate Θ2 in equation (2) and sort it out:

 ( 2accos91 - 2ce ) sin93 + ( 2cf - 2acsin91 ) cos93=a2 - b2 + c2 + e2 + f2 - 2aecos91 - 2afsin91

 (3)

 Let r K=2accos91 - 2ce

 J L=2cf - 2acsin91

 , M=a2 - b2 + c2 + e2 + f2 - 2aecos91 - 2afsin91

 (4)

 Then equation (3) can be rewritten as:

 Ksin93+Lcos93=M

 (5)

 Solution (5) is available:

 Θ3= arcsin[ M/ ( K2 + L2 ) 1/2 ] - arctanL/K ( 6 ) In ACDE, if Θ3, c, d is known, then the sine theorem knows:

 a= arcsin[csin63/d]

 (7)

 The coordinates of point B are ( -acosBl, asinBl ), and the coordinates of point D are ( -e, f) , then the length of line segment BD is LBD:

LBD= [( acos01 - e ) 2 + ( asin01 - f ) 2] 1/2 (8) In ABCD, β can be obtained from the cosine theorem, and its value is: β = arccosi b2 + c2 - L2BD/2bc] ( 9 ) Therefore, as shown in Figure 1:

 r m=csin ( + Θ3 )

 L l=csin

 (10)

 Substituting the above formula into equation (1) gives:

 i=sin cosa/sin( a + Θ3 ) ( 11 ) Therefore, when the crank angle Θ1 of the crank is known, the boosting ratio of the crank force increasing mechanism as shown in Fig. 1 can be obtained.

 From the above process of establishing the mathematical model, the process of solving the force increase ratio of the crank force mechanism is quite cumbersome, and often requires dozens of basic data to determine the optimal length and maximum force ratio. In the design of the crank-increasing mechanism in the past, the trial-and-error method was used: firstly, the length of each rod was roughly determined according to experience, and then the motion diagram of the mechanism was drawn proportionally, and 1 m was determined when the angle a was different. The value or β, Θ3 value, and then substituted into the formula (1) or (11) to calculate the corresponding force ratio i value. If the value of i does not meet the design requirements, then the length value of each rod needs to be adjusted to recalculate the calculation. It can be seen that the design process is rather cumbersome and inefficient, and the calculated i value is not accurate due to the inherent error of the measured 1, m, α, β, and Θ3 values. The numerical simulation method is much simpler and more convenient, and the calculation results are more accurate and reliable. Excerpted from "Simulation Design of Crank Forces", Luo Shanming, Mechanical Science and Technology, May 2002.

 In addition, from the structural point of view, there are more structural components in the force-increasing process. From the power drive input to the force of the actuator, the structural components are: drive motor a hinge (A) a crank (1) a hinge (B) a link (2) a hinge (C) a rocker (3) A hinge (D) a link (4) a hinge (E) a slider (5), a total of 11 components. The structure is complex, affecting transmission efficiency, and manufacturing is relatively difficult.

 Similarly, such a problem exists in the toggle mechanism.

In addition, in the forming equipment driven by the servo motor, the screw mechanism is widely used to convert the rotary motion into a linear motion. In view of the requirements of servo drives, ball screws are currently used. However, the ball bearing capacity is limited, and the price is high. The development of low-cost heavy-duty high-efficiency precision spiral pair has become one of the problems to be solved in servo forming equipment. One of the ways out is to develop heavy-duty rolling screws, but its carrying capacity can not meet the large-scale forming equipment of several hundred tons to thousands of tons; the second is development New high-efficiency heavy-duty precision sliding spiral pair. The development of the new sliding screw drive pair has three key technologies to break through: First, the development of new wear-resistant anti-friction materials and preparation technology, in addition to metal materials, non-metallic materials, composite materials, etc.; The nut structure is improved to make the load distribution more uniform. The third is to improve the lubrication conditions and use a special manufacturing process to form an efficient lubrication flow path in the spiral pair. Excerpted from "AC Servo Press and Its Key Technologies", Sun Yousong, Zhou Xianhui, Li Wei, Wei Liangmo, Huang Kaisheng, He Hongsu, "Forging Technology", August 2008.

 Therefore, how to provide a force increasing device, the structure is simple, the calculation of the force ratio is simple, and the accurate control of displacement, speed and output force can be realized in a precision forming machine, which is an important technical problem to be solved by those skilled in the art.

Summary of the invention

 In view of this, the present invention provides a booster device which has a simple structure and simple calculation of the boost ratio, and can accurately control the displacement, speed and output force in a precision forming machine.

 To achieve the above object, the present invention provides the following technical solutions:

 A force increasing device, comprising:

 Machine base;

 a ball screw disposed on the base, the ball screw is sleeved with a ball nut; a thrust block having a wedge structure connected to the ball nut, and the angle of the inclined surface of the thrust block is not more than 45 Degree

 a booster block disposed on the inclined surface of the thrust block by a bevel rolling guide pair;

 A servo motor for driving the ball screw.

 Preferably, the ball screw is mounted on the base by a screw support and a screw support.

 Preferably, the servo motor is coupled to the ball screw through a coupling.

 Preferably, the device further includes a limiting device fixed to the base and connected to the thrust block. Preferably, the limiting device comprises:

 a limit rod connected to the thrust block;

a limit sleeve sleeved on the limit rod; Mounted on the base for fixing the limiting rod and the limiting seat of the limiting sleeve. Preferably, the bevel rolling guide pair comprises:

 a fixed rail plate attached to the thrust block;

 a moving plate attached to the booster block;

 a moving small plate coupled to the moving plate by a connecting key and a connecting screw; a first needle disposed between the moving plate and the fixed rail plate;

 A second needle is disposed between the moving small plate and the fixed rail plate.

 Preferably, the number of the first needle roller and the second needle roller are two rows arranged in opposite directions. Preferably, the method further includes:

 a lower rail guide pair and a thrust block upper rail pair disposed on both sides of the base and the thrust block;

 The right rail pair of the booster block and the left rail pair of the booster block are disposed on both sides of the base and the booster block.

 Preferably, the thrust block lower rail pair, the thrust block upper rail pair, the booster block right rail pair and the booster block left rail pair are all rolling guide pairs.

 Preferably, the specific number of the thrust blocks is two, which are respectively a first thrust block and a second thrust block, one end of the first thrust block is connected to the servo motor, and the other end has a wedge structure, One end of the second thrust block is disposed on the inclined surface of the first thrust block through the first inclined rolling guide pair, and the other end also has a wedge structure, and the boosting block is disposed on the first through the second inclined rolling guide pair The slope of the two thrust blocks.

 It can be seen from the above technical solution that the booster device provided by the present invention effectively combines the servo motor, the ball screw pair and the wedge mechanism, has a simple structure, and the calculation of the boost ratio is simple, and can be precise. Precise control of displacement, speed and output force in forming machines.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only Are some embodiments of the invention, to those of ordinary skill in the art In other words, other drawings can be obtained from these drawings without any creative work.

 1 is a schematic structural view and a motion analysis diagram of a crank connecting rod force increasing mechanism in the prior art; FIG. 2 is a schematic structural view of a boosting device according to an embodiment of the present invention;

 3 is a force analysis diagram of a thrust block and a booster block of a booster device according to an embodiment of the present invention; FIG. 4 is a force analysis diagram of a thrust block of a booster device according to an embodiment of the present invention; The force analysis diagram of the booster block of the booster device provided by the embodiment; FIG. 6 is a schematic structural view of the ramp guide rail pair of the booster device according to the embodiment of the present invention;

 7 is a side view of a bevel rolling guide pair of a booster device according to an embodiment of the present invention; FIG. 8 is a cross-sectional view taken along line B-B of FIG.

 Figure 9 is a cross-sectional view taken along line A-A of Figure 2;

 FIG. 10 is a schematic structural view showing a combination of a rolling guide pair and a hydrostatic guide of a booster according to an embodiment of the present invention; FIG.

 11 is a schematic structural view of a static pressure guide of a booster device according to an embodiment of the present invention; and FIG. 12 is a schematic structural view of a booster device having two thrust wedges of a series wedge structure according to an embodiment of the present invention.

detailed description

 The invention discloses a force increasing device which has a simple structure and simple calculation of the force increasing ratio, and can realize precise control of displacement, speed and output force in a precision forming machine.

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 Referring to FIG. 2, the boosting device provided by the embodiment of the present invention includes:

 The base 18 is fixedly mounted on the ground or the corresponding table and machine table;

a ball screw 16 disposed on the base 18, the ball screw 16 is sleeved with a ball nut 15; Connected to the ball nut 15, the thrust block 17 has a wedge structure, and the angle of the slope of the thrust block 17 is not more than 45 degrees. The ball screw 16 rotates and linearly moves the ball nut 15 thereon, and the ball nut 15 pushes the thrust block 17 to convert the rotary motion of the ball screw 16 into a linear motion;

 A booster block 25 is provided on the inclined surface of the thrust block 17 by the inclined rolling guide pair 24, and the thrust block

17 through the inclined rolling guide pair 24 and then push the booster block 25 for linear motion;

 The servo motor 11 for driving the ball screw 16 has the advantages of compounding, high efficiency, high precision, high flexibility, low noise, energy saving and environmental protection as compared with the conventional hydraulic system driving.

 From the power drive input to the force execution part, the structural parts are: Servo motor 11 - Coupling 12 - Ball screw 16 - Ball nut 15 - Thrust block 17 - Beveled rolling guide pair 24 - Force block 25, Total 7 parts, simple structure.

Now let's analyze the force of the thrust block 17 and the booster block 25, as shown in Fig. 3, Fig. 4 and Fig. 5, by the force analysis of the thrust block 17, Fo' = F ₀ / Sina (12) Force analysis of force block 15 shows that FfFo' *Cosa (13) is of formula (12) and formula (13): F!=F ₀ *Cosa/ Sina=Ctga*F ₀ (14) Force ratio: i= F ₁ /F. = Ctga (15) When 0° a 45. , Fj > F ₀ ; for example: a = 2°, i = 28.6; a = 5°, i = 11.4; α = 10°, i = 5.67, the force can be increased;

When 45. < a 90. , Fj < F ₀ ;

 When a → 0°, → ∞;

 When a → 90. When, → 0.

 It can be seen that the calculation of the force ratio of the wedge mechanism is simple, and it is only related to the angle of the slope. Once the angle of the mechanism is determined, the force ratio is constant.

It is also known from the force transfer formula of the ball screw pair: F. =2 X 10 ³ πΜ/1ι (16) where Μ—servo motor torque, Nm, h—ball screw pitch, mm.

*Ctga/h=K*M ( K为常数） (17) 由式（17 )可知， 机构的输出力 与伺服电机的转矩 Μ成正比， 与滚 珠丝杠的螺距 h和斜面的角度 a成反比， 结构一旦定型， Ctga/h为一个常数， 增力块的输出力只与伺服电机的转矩有关。 相对的作用为： 伺服电机的驱 动力可以减小 tga (省力、 节能）； 滚珠丝杠的承载能力被增大 Ctga倍（大 输出力成为可能）。 By (14) and (16),

*Ctga/h=K*M (K is a constant) (17) It can be seen from equation (17) that the output force of the mechanism is proportional to the torque Μ of the servo motor, and is proportional to the pitch h of the ball screw and the angle a of the slope. Inversely, once the structure is finalized, Ctga/h is a constant. The output force of the booster block is only related to the torque of the servo motor. The relative role is: The driving force of the servo motor can be reduced by tga (saving effort, energy saving); the bearing capacity of the ball screw is increased by Ctga times (large output force is possible).

 In summary, the booster device provided by the embodiment of the present invention can effectively realize the input driving force and obtain a large output force by effectively combining the servo motor, the ball screw pair and the wedge mechanism. Reciprocating motion, compared with the traditional structure, the structure is simple, the transmission efficiency is high, the transmission rigidity is good, the implementation is easier, and the calculation of the force ratio is simple, thereby solving the problem of complicated structure and large energy consumption of the driving power source and the transmission device. The output force and speed are linear with the drive input (torque, speed), enabling precise control of displacement, speed and output force in precision forming machines.

 As shown in Fig. 2, the ball screw 16 is mounted on the base 18 via a screw support 13 and a screw support 14. The lead screw support member 13 is set on the ball screw 16, and the screw support base 14 is respectively provided with a threaded hole in a portion opposite to the base 18, and the screw support base 14 is mounted on the base 18 by screws.

 As shown in Fig. 2, the servo motor 11 is coupled to the ball screw 16 via a coupling 12. Coupling

12 The two shafts of the servo motor 11 and the ball screw 16 are coupled to rotate together to transmit torque, and in the high-speed heavy-duty power transmission, the utility model also has the functions of buffering, damping and improving the dynamic performance of the shafting.

n*h*tga=K*n ( K为常数）。 由此可见， 11 _§01= 为一个常数， 机构的位移只与伺服电机的回转圈数有关。 The displacement of the ball nut is L _Q =n*h, where n—the number of revolutions of the servo motor will be; h—the pitch of the ball screw; the displacement of the mechanism

n*h*tga=K*n (K is a constant). It can be seen that 11 _§ 01= is a constant, and the displacement of the mechanism is only related to the number of revolutions of the servo motor.

 The booster is a limited stroke boost, that is, when the thrust block 17 moves L. In the process of the distance, the boosting block 25 realizes the force increase within the range of the distance, and the relationship is IL^tgou. The boosting device provided by the embodiment of the invention further includes being fixed on the base 18 and connected to the thrust block 17 Limit device.

 Specifically, the limiting device includes: a limiting rod 19 connected to the thrust block 17; a limiting sleeve 21 sleeved on the limiting rod 19; mounted on the base 18 for fixing the limiting rod 19 and the limit Set of 21 limit seats 20.

Referring to FIG. 2, the limit rod 19 is fixed at the right end of the thrust block 17, and the limit rod 19 passes through the limit. After the seat 20, the upper limit sleeve 21 is fixed and fixed. When the thrust block 17 moves to the left, the limit sleeve 21 on the limit rod 19 is blocked at the right end of the limit seat 20, and the thrust block 17 stops moving to the left; When the thrust block 17 moves to the right, the right end of the thrust block 17 is blocked at the left end of the limit seat 20, and the thrust block 17 stops moving to the right; then, these two limits form the left and right limits of the stroke L _Q of the thrust block 17. Bit, making the thrust block at stroke L. Move within the range to achieve the boosting force of the booster block 25 within the range of travel.

 As shown in FIGS. 6 and 7, the bevel rolling guide pair 24 includes: a fixed rail plate 37 connected to the thrust block 17; a moving plate 31 connected to the booster block 25; and moved by the connecting key 33 and the connecting screw 34 A moving small plate 36 to which the plates 31 are coupled together; a first needle 32 disposed between the moving plate 31 and the fixed rail plate 37; and a second needle 35 disposed between the moving small plate 36 and the fixed rail plate 37. To reduce frictional resistance. When the thrust block 17 pushes the booster block 25 through the inclined surface, the needle roller 32 between the moving plate 31 and the fixed rail plate 37 rolls and is forced, and when the thrust block 17 moves back through the bevel belt force increasing block 25, The needle roller 35 between the moving small plate 36 and the fixed rail plate 37 is rolled and stressed, thereby realizing reciprocating motion, thereby making it possible to apply on a precision large heavy-duty forming machine that frequently reciprocates.

 In order to further optimize the above-described technical solution, the number of the first needle roller 32 and the second needle roller 35 are both two rows arranged opposite each other. Of course, you can set more needles or change their position depending on the specific use.

 According to the force analysis, when the thrust block 17 moves and pushes the booster block 25 through the inclined surface, the upper and lower faces of the thrust block 17 and the left and right faces of the booster block 25 and the inclined faces are subjected to different forces, and naturally generate a certain frictional resistance. In order to reduce the transmission efficiency, in order to reduce the frictional resistance, the guide rail pair is arranged on the contact surface to reduce the frictional resistance and improve the transmission efficiency. Referring to FIG. 8 and FIG. 9, the boosting device provided by the embodiment of the present invention further includes:

 The thrust block lower rail pair 22 and the thrust block upper rail pair 23 disposed on both sides of the base 18 and the thrust block 17;

 The booster block right rail pair 26 and the booster block left rail pair 27 are disposed on both sides of the base 18 and the booster block 25.

Further, as shown in FIGS. 8 and 9, the thrust block lower rail pair 22, the thrust block upper rail pair 23, the booster block right rail pair 26, and the booster block left rail pair 27 are all rolling guide pairs. If scrolling When the load capacity of the rail pair is limited, it can also be replaced by a static pressure rail, see Figure 11, or a combination of rolling and static pressure, see Figure 10.

 In the above embodiment, a bevel is used for one force, and two bevels (series) can be used instead of the second force to increase the boost ratio. As shown in FIG. 12, the specific number of the thrust blocks 17 is two, which are a first thrust block 17-1 and a second thrust block 17-2, respectively, and one end of the first thrust block 17-1 is connected to the servo motor 11, and another One end has a wedge structure, one end of the second thrust block 17-2 is disposed on the inclined surface of the first thrust block 17-1 through the first inclined rolling guide pair, and the other end also has a wedge structure, and the force increasing block 25 passes through the second The bevel rolling guide pair is disposed on the inclined surface of the second thrust block 17-2.

 In addition, in the structural arrangement, it is also possible to use two force-increasing devices in parallel to relieve the bearing pressure of the single device.

 The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on differences from the other embodiments, and the same similar parts between the various embodiments can be referred to each other.

 The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but the broadest scopes

Claims

Rights request 1. A booster device, comprising:  Base (18);  a ball screw (16) disposed on the base (18), the ball screw (16) is provided with a ball nut (15);  Connected to the ball nut (15), having a wedge structure (17), and the angle of the inclined surface of the pushing block (17) is not more than 45 degrees;  a booster block (25) disposed on the inclined surface of the thrust block (17) by a bevel rolling guide pair (24);  A servo motor (11) for driving the ball screw (16).  2. The boosting device according to claim 1, wherein the ball screw (16) is mounted on the base (18) via a screw support (13) and a screw support (14) on.  A booster according to claim 1, characterized in that the servo motor (11) is connected to the ball screw (16) via a coupling (12).  The force increasing device according to claim 1, further comprising a limiting device fixed to said base (18) and connected to said thrust block (17).  The force increasing device according to claim 4, wherein the limiting device comprises: a limiting rod (19) connected to the thrust block (17);  a limiting sleeve (21) sleeved on the limiting rod (19);  Mounted on the base (18) for fixing the limiting rod (19) and the limiting seat (20) of the limiting sleeve (21).  The force increasing device according to claim 1, wherein the bevel rolling guide pair (24) comprises:  a fixed rail plate (37) attached to the thrust block (17);  a moving plate (31) connected to the booster block (25);  a moving small plate (36) coupled to the moving plate (31) by a connecting key (33) and a connecting screw (34); a first needle (32) disposed between the moving plate (31) and the fixed rail plate (37); A second needle (35) is disposed between the moving small plate (36) and the fixed rail plate (37).  The force increasing device according to claim 6, wherein the number of the first needle roller (32) and the second needle roller (35) are two arranged in opposite rows.  8. The force increasing device according to claim 1, further comprising:  a thrust block lower rail pair (22) and a thrust block upper rail pair (23) disposed on both sides of the base (18) and the thrust block (17);  A booster block right rail pair (26) and a booster block left rail pair (27) are disposed on both sides of the base (18) and the booster block (25).  The booster device according to claim 8, wherein the thrust block lower rail pair (22), the thrust block upper rail pair (23), and the booster block right rail pair (26) And the left rail pair (27) of the booster block are both rolling guide pairs.  The force increasing device according to any one of claims 1-9, wherein the specific number of the thrust blocks (17) is two, which are respectively a first thrust block (17-1) and a second a thrust block (17-2), one end of the first thrust block (17-1) is connected to the servo motor (11), and the other end has a wedge structure, and the second thrust block (17-2) One end is disposed on the inclined surface of the first thrust block (17-1) through the first inclined surface, and the other end also has a wedge structure, and the boosting block (25) is disposed on the second inclined rolling guide pair The inclined surface of the second thrust block (17-2).