CN112606645B - A non-equidistant suspension device for an engineering vehicle - Google Patents
A non-equidistant suspension device for an engineering vehicle Download PDFInfo
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- CN112606645B CN112606645B CN202011617226.8A CN202011617226A CN112606645B CN 112606645 B CN112606645 B CN 112606645B CN 202011617226 A CN202011617226 A CN 202011617226A CN 112606645 B CN112606645 B CN 112606645B
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- 239000000725 suspension Substances 0.000 title claims abstract description 71
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
- B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
- B60G13/08—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type hydraulic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/005—Suspension locking arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/016—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
- B60G17/0165—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input to an external condition, e.g. rough road surface, side wind
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
本发明公开了一种工程车辆非等距悬架装置，包括前车架和后车架，前车架内左右两侧分别连有前悬架油缸，前悬架油缸下端连有前桥，前车架与前桥之间通过前部上推杆和前部下推杆连接，前部上推杆位于前部下推杆的上方，上推杆呈正八字形布置，前部上推杆的前端和后端分别与前桥和前车架铰接连接，前部下推杆与前车架平行布置，后车架的连接结构与前车架类似，前车架内安装有前电磁阀和前蓄能器，后车架内安装有后电磁阀和后蓄能器，前车架和后车架内分别设置有用于限制前桥和后桥的限位支座。本发明提供的一种工程车辆非等距悬架装置，作业工况时前、后的上、下推杆受力均衡，同时实现了后桥在崎岖路面左右摆动需求；行驶工况时前后悬架油缸受力均衡，同时提升整机防止侧倾能力及平顺性。
The invention discloses a non-equidistant suspension device for an engineering vehicle, comprising a front frame and a rear frame, wherein the left and right sides of the front frame are respectively connected with front suspension cylinders, the lower end of the front suspension cylinder is connected with a front axle, the front frame and the front axle are connected via a front upper push rod and a front lower push rod, the front upper push rod is located above the front lower push rod, the upper push rod is arranged in a regular figure eight shape, the front end and the rear end of the front upper push rod are respectively hingedly connected to the front axle and the front frame, the front lower push rod is arranged in parallel with the front frame, the connection structure of the rear frame is similar to that of the front frame, a front solenoid valve and a front accumulator are installed in the front frame, a rear solenoid valve and a rear accumulator are installed in the rear frame, and limit supports for limiting the front axle and the rear axle are respectively arranged in the front frame and the rear frame. The present invention provides a non-equidistant suspension device for an engineering vehicle. In operating conditions, the front and rear upper and lower push rods are subjected to balanced forces, while realizing the requirement for the rear axle to swing left and right on a rough road surface. In driving conditions, the front and rear suspension cylinders are subjected to balanced forces, while improving the anti-rolling capability and smoothness of the entire machine.
Description
技术领域Technical Field
本发明涉及一种工程车辆非等距悬架装置，属于轮胎式工程车辆技术领域。The invention relates to a non-equidistant suspension device for an engineering vehicle, belonging to the technical field of tire-type engineering vehicles.
背景技术Background Art
根据工作环境和使用工况需求，轮胎式工程车辆尤其轮胎式装载机、推土机对于悬架的作业工况适应性及高速行驶平顺性有较高要求。但目前使用的车辆悬架装置，无法同时兼顾高速行驶工况下的平顺性和抗侧倾能力，又满足工作工况下的前后悬架受力不均衡及整机作业适应性要求。According to the working environment and operating conditions, wheeled engineering vehicles, especially wheeled loaders and bulldozers, have high requirements for the adaptability of the suspension to the working conditions and the smoothness of high-speed driving. However, the vehicle suspension devices currently used cannot simultaneously take into account the smoothness and anti-rolling ability under high-speed driving conditions, and meet the requirements of the unbalanced force of the front and rear suspensions and the adaptability of the whole machine under working conditions.
发明内容Summary of the invention
本发明要解决的技术问题是，提供一种能够满足工程车辆在行驶工况与工作工况下的适应性需求的工程车辆非等距悬架装置。The technical problem to be solved by the present invention is to provide a non-equidistant suspension device for an engineering vehicle which can meet the adaptability requirements of the engineering vehicle under driving conditions and working conditions.
为解决上述技术问题，本发明采用的技术方案为：In order to solve the above technical problems, the technical solution adopted by the present invention is:
一种工程车辆非等距悬架装置，包括前车架和后车架，所述前车架内左右两侧分别连有前悬架油缸，所述前悬架油缸下端连有前桥，所述前车架与所述前桥之间通过前部上推杆和前部下推杆连接，所述前部上推杆位于所述前部下推杆的上方，所述前部上推杆呈正八字形布置，所述前部上推杆的前端和后端分别与所述前桥和前车架铰接连接，所述前部下推杆与所述前车架平行布置，所述后车架外左右两侧分别连有后悬架油缸，所述后悬架油缸下端连有后桥，所述后车架与所述后桥之间通过后部上推杆和后部下推杆连接，所述后部上推杆位于所述后部下推杆的上方，所述后部上推杆呈倒八字形布置，所述后部上推杆的前端和后端分别与所述后车架和后桥铰接连接，所述后部下推杆与所述后车架平行布置，所述前车架内安装有前电磁阀和前蓄能器，所述后车架内安装有后电磁阀和后蓄能器，所述前车架和后车架内分别设置有用于限制所述前桥和后桥的限位支座。A non-equidistant suspension device for an engineering vehicle comprises a front frame and a rear frame, wherein the front frame is connected to front suspension cylinders on the left and right sides respectively, the lower end of the front suspension cylinder is connected to a front axle, the front frame and the front axle are connected via a front upper push rod and a front lower push rod, the front upper push rod is located above the front lower push rod, the front upper push rod is arranged in a regular figure eight shape, the front end and the rear end of the front upper push rod are respectively hingedly connected to the front axle and the front frame, the front lower push rod is arranged in parallel with the front frame, the rear frame is connected to rear suspension cylinders on the left and right sides respectively, the rear The lower end of the suspension cylinder is connected to the rear axle, and the rear frame and the rear axle are connected through a rear upper push rod and a rear lower push rod, the rear upper push rod is located above the rear lower push rod, and the rear upper push rod is arranged in an inverted eight-shaped shape, and the front and rear ends of the rear upper push rod are respectively hingedly connected to the rear frame and the rear axle, and the rear lower push rod is arranged parallel to the rear frame, a front solenoid valve and a front accumulator are installed in the front frame, a rear solenoid valve and a rear accumulator are installed in the rear frame, and limit supports for limiting the front axle and the rear axle are respectively provided in the front frame and the rear frame.
所述前部上推杆和前部下推杆在纵向投影上等距设置，与所述前桥和前车架成近似等边四边形结构。The front upper push rod and the front lower push rod are equidistantly arranged in the longitudinal projection, and form an approximately equilateral quadrilateral structure with the front axle and the front frame.
所述后部上推杆和后部下推杆在纵向投影上等距设置，与所述后桥和后车架成近似等边四边形结构。The rear upper push rod and the rear lower push rod are equidistantly arranged in the longitudinal projection, and form an approximately equilateral quadrilateral structure with the rear axle and the rear frame.
所述前车架后端与所述后车架前端铰接连接。The rear end of the front frame is hingedly connected to the front end of the rear frame.
所述前悬架油缸下连接点位于所述前桥后侧最低位，所述后悬架油缸下连接点位于所述后桥后侧最低位。The lower connection point of the front suspension oil cylinder is located at the lowest position on the rear side of the front axle, and the lower connection point of the rear suspension oil cylinder is located at the lowest position on the rear side of the rear axle.
同侧的所述前悬架油缸与所述后悬架油缸在横向投影呈八字形布置，作业工况时前悬架油缸位于下限位刚性锁死，后悬架油缸位于中间位；在行驶工况前悬架油缸位于中间位，后悬架油缸仍处中间位。The front suspension cylinder and the rear suspension cylinder on the same side are arranged in an eight-shape in lateral projection. In the working condition, the front suspension cylinder is rigidly locked at the lower limit, and the rear suspension cylinder is in the middle position; in the driving condition, the front suspension cylinder is in the middle position, and the rear suspension cylinder is still in the middle position.
本发明的有益效果：Beneficial effects of the present invention:
1、前桥与前车架以及后桥与后车架之间通过悬架油缸连接，工程车辆行驶工况时，前、后悬架油缸处于中间位，前、后悬架油缸受力均衡，提高整机高速行驶平顺性及转向防侧倾能力。前、后悬架油缸同时处于最低位时，整机高度下降，提升过桥洞、隧道等工况适应性。前、后悬架油缸同时处于最高位时，整机高度上升，提升涉水等工况适应性。1. The front axle and front frame, as well as the rear axle and rear frame are connected by suspension cylinders. When the engineering vehicle is in driving condition, the front and rear suspension cylinders are in the middle position, and the front and rear suspension cylinders are balanced, which improves the high-speed driving smoothness and steering anti-roll capability of the whole machine. When the front and rear suspension cylinders are in the lowest position at the same time, the height of the whole machine decreases, improving the adaptability to working conditions such as bridge tunnels and tunnels. When the front and rear suspension cylinders are in the highest position at the same time, the height of the whole machine increases, improving the adaptability to working conditions such as wading.
2、工程车辆作业工况时，前悬架油缸处于下限位刚性锁死，使前车架上的限位支座与前桥连接，当整车进行铲装或推土作业时，前桥承受大部分冲击载荷，上、下推杆承小部分冲击载荷，起到装置保护状态；此时后悬架油缸处于中间位，实现了后桥在崎岖路面左右摆动需求。2. When the engineering vehicle is in operation, the front suspension cylinder is rigidly locked in the lower limit position, so that the limit support on the front frame is connected to the front axle. When the vehicle is shoveling or bulldozing, the front axle bears most of the impact load, and the upper and lower push rods bear a small part of the impact load, which plays a protective role. At this time, the rear suspension cylinder is in the middle position, realizing the requirement of the rear axle swinging left and right on rough roads.
3、装置中连接车架与桥的上推杆、下推杆布置在纵向投影上等距设计，与车架、桥形成近似等边四边形结构，实现了行驶工况时桥在运动过程中只做平移运动，保证了前后悬架油缸及推杆受力均衡。3. The upper push rod and the lower push rod connecting the frame and the bridge in the device are arranged equidistantly in the longitudinal projection, forming an approximately equilateral quadrilateral structure with the frame and the bridge, so that the bridge only performs translational movement during the driving condition, ensuring that the front and rear suspension cylinders and push rods are balanced in force.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明的一种工程车辆非等距悬架装置的主视结构示意图；FIG1 is a schematic diagram of the front view of a non-equidistant suspension device for an engineering vehicle according to the present invention;
图2为本发明的一种工程车辆非等距悬架装置的俯视结构示意图。FIG. 2 is a schematic diagram of a top view of a non-equidistant suspension device for an engineering vehicle according to the present invention.
图中附图标记如下：1-前车架；2-前电磁阀；3-限位支座；4-前桥；5-前悬架油缸；6-前蓄能器；7-前部上推杆；8-前部下推杆；9-后车架；10-后桥；11-后悬架油缸；12-后部上推杆；13-后部下推杆；14-后电磁阀；15-后蓄能器。The reference numerals in the figure are as follows: 1-front frame; 2-front solenoid valve; 3-limit support; 4-front axle; 5-front suspension cylinder; 6-front accumulator; 7-front upper push rod; 8-front lower push rod; 9-rear frame; 10-rear axle; 11-rear suspension cylinder; 12-rear upper push rod; 13-rear lower push rod; 14-rear solenoid valve; 15-rear accumulator.
具体实施方式DETAILED DESCRIPTION
下面结合附图对本发明作进一步描述，以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention.
如图1和图2所示，一种工程车辆非等距悬架装置，包括前车架1和后车架9，前车架1后端与后车架9前端铰接连接，前车架1与后车架9之间可以实现左右摆动。As shown in FIG. 1 and FIG. 2 , a non-equidistant suspension device for an engineering vehicle includes a front frame 1 and a rear frame 9 , wherein the rear end of the front frame 1 is hingedly connected to the front end of the rear frame 9 , and the front frame 1 and the rear frame 9 can swing left and right.
前车架1与前桥4之间通过前部上推杆7和前部下推杆8连接，前部上推杆7位于前部下推杆8的上方，前部上推杆7呈正八字形布置，前部上推杆7的前端和后端分别与前桥4和前车架1铰接连接，前部下推杆8与前车架1平行布置。前部上推杆7和前部下推杆8在纵向投影上等距设置，与前桥4和前车架1成近似等边四边形结构，实现行驶工况前桥4上下平动。同时前部上推杆7距地面距离约等于两倍前部上推杆7、前部下推杆8距离进行设计，并保证前部上推杆7、前部下推杆8受力均衡。前车架1内左右两侧分别连有前悬架油缸5，两个前悬架油缸5左右对称设置。前悬架油缸5下端连有前桥4，前悬架油缸5下连接点位于前桥4后侧最低位，充分保证整车行驶及作业时整机受力点下移，提升侧倾能力。前车架1内安装有前电磁阀2和前蓄能器6，前车架1内设置有用于限制前桥4限位支座3。The front frame 1 is connected to the front axle 4 through the front upper push rod 7 and the front lower push rod 8. The front upper push rod 7 is located above the front lower push rod 8. The front upper push rod 7 is arranged in a regular eight-shaped shape. The front end and the rear end of the front upper push rod 7 are respectively hingedly connected to the front axle 4 and the front frame 1, and the front lower push rod 8 is arranged in parallel with the front frame 1. The front upper push rod 7 and the front lower push rod 8 are arranged equidistantly in the longitudinal projection, and form an approximately equilateral quadrilateral structure with the front axle 4 and the front frame 1, so as to realize the up and down translation of the front axle 4 in the driving condition. At the same time, the front upper push rod 7 is designed to be approximately twice the distance between the front upper push rod 7 and the front lower push rod 8 from the ground, and the front upper push rod 7 and the front lower push rod 8 are ensured to be balanced in force. The front frame 1 is connected to the front suspension oil cylinder 5 on the left and right sides respectively, and the two front suspension oil cylinders 5 are arranged symmetrically on the left and right sides. The lower end of the front suspension cylinder 5 is connected to the front axle 4, and the lower connection point of the front suspension cylinder 5 is located at the lowest position behind the front axle 4, which fully ensures that the force point of the whole machine moves downward when the whole vehicle is traveling and working, and improves the roll ability. The front solenoid valve 2 and the front accumulator 6 are installed in the front frame 1, and the limit support 3 for limiting the front axle 4 is set in the front frame 1.
后车架9与后桥10之间通过后部上推杆12和后部下推杆13连接，后部上推杆12位于后部下推杆13的上方，后部上推杆12呈倒八字形布置，后部上推杆12的前端和后端分别与后车架9和后桥10铰接连接，后部下推杆13与后车架9平行布置。后部上推杆12和后部下推杆13在纵向投影上等距设置，与后桥10和后车架9成近似等边四边形结构，实现行驶工况后桥9上下平动。同时后部上推杆12距地面距离约等于两倍后部上推杆12、后部下推杆13距离进行设计，并保证部上推杆12、后部下推杆13受力均衡。后车架9外左右两侧分别连有后悬架油缸11，后悬架油缸11下端连有后桥10，后悬架油缸11下连接点位于后桥10后侧最低位，充分保证整车行驶及作业时整机受力点下移，提升侧倾能力。后车架9内安装有后电磁阀14和后蓄能器15，后车架9内设置有用于限制后桥10的限位支座3。The rear frame 9 is connected to the rear axle 10 through the rear upper push rod 12 and the rear lower push rod 13. The rear upper push rod 12 is located above the rear lower push rod 13. The rear upper push rod 12 is arranged in an inverted eight-shaped shape. The front end and the rear end of the rear upper push rod 12 are respectively hingedly connected to the rear frame 9 and the rear axle 10, and the rear lower push rod 13 is arranged parallel to the rear frame 9. The rear upper push rod 12 and the rear lower push rod 13 are equidistantly arranged in the longitudinal projection, and form an approximately equilateral quadrilateral structure with the rear axle 10 and the rear frame 9, so as to realize the up and down translation of the rear axle 9 under the driving condition. At the same time, the rear upper push rod 12 is designed to be about twice the distance between the rear upper push rod 12 and the rear lower push rod 13 from the ground, and the upper push rod 12 and the rear lower push rod 13 are ensured to be balanced in force. The rear frame 9 is connected to the left and right sides of the rear suspension cylinder 11, and the lower end of the rear suspension cylinder 11 is connected to the rear axle 10. The lower connection point of the rear suspension cylinder 11 is located at the lowest position behind the rear axle 10, which fully ensures that the force point of the whole machine moves downward when the whole vehicle is traveling and working, and improves the roll ability. The rear solenoid valve 14 and the rear accumulator 15 are installed in the rear frame 9, and the limit support 3 for limiting the rear axle 10 is set in the rear frame 9.
本发明的工作过程为：前后同侧前悬架油缸5、后悬架油缸11在横向投影呈八字非等距布置。在车辆行驶工况时，前电磁阀2打开，前悬架油缸5与前蓄能器6连接，同时后电磁阀14打开，后悬架油缸11与后蓄能器15连接，此时前悬架油缸5、后悬架油缸11处于中间位，保证了高速行驶平顺性，同时提高了车辆转向抗侧倾能力。在车辆作业工况时，前电磁阀2关闭，前悬架油缸5与前蓄能器6连接关闭，同时后电磁阀14仍打开，后悬架油缸11与后蓄能器15连接，此时前悬架油缸5处于最低位锁死状态，后悬架油缸11处于中间位，保证了作业前桥承受较大冲击载荷，上下推杆承受较小载荷要求，同时实现了崎岖地面作业工况车辆后桥左右摆动需求。The working process of the present invention is as follows: the front suspension cylinder 5 and the rear suspension cylinder 11 on the same side of the front and rear are arranged in an 8-shaped non-equidistant manner in the lateral projection. When the vehicle is in driving condition, the front solenoid valve 2 is opened, the front suspension cylinder 5 is connected to the front accumulator 6, and the rear solenoid valve 14 is opened, and the rear suspension cylinder 11 is connected to the rear accumulator 15. At this time, the front suspension cylinder 5 and the rear suspension cylinder 11 are in the middle position, which ensures the smoothness of high-speed driving and improves the anti-rolling ability of the vehicle. When the vehicle is in working condition, the front solenoid valve 2 is closed, the front suspension cylinder 5 is connected to the front accumulator 6 and closed, and the rear solenoid valve 14 is still opened, and the rear suspension cylinder 11 is connected to the rear accumulator 15. At this time, the front suspension cylinder 5 is in the lowest position locked state, and the rear suspension cylinder 11 is in the middle position, which ensures that the front axle of the operation bears a large impact load, and the upper and lower push rods bear a small load requirement, and at the same time realizes the left and right swing requirements of the rear axle of the vehicle in the rough ground working condition.
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
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