Control device for oil cylinder of push plate mechanism of compression type garbage truck
阅读说明：本技术 一种压缩式垃圾车推板机构油缸的控制装置 (Control device for oil cylinder of push plate mechanism of compression type garbage truck ) 是由 符鹏 吴春保 魏新 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种压缩式垃圾车推板机构油缸的控制装置,包括阀体,所述阀体内设有安装孔,所述阀体在安装孔的左端安装有左端盖、右端安装有右端盖,所述左端盖内设有左塞孔,所述右端盖内设有右塞孔；所述阀体的侧面设有P口、A口、B口、T1口、T2口,所述安装孔内滑动连接有阀芯,所述阀芯的左端设有左柱塞、右端设有右柱塞；所述安装孔内在左端盖和阀芯之间滑动连接有套接在左柱塞上的左阀套、在右端盖和阀芯之间滑动连接有套接在有柱塞上的右阀套；所述左柱塞内设有与左阀套配合的左锁紧组件,所述右柱塞内设有与右阀套配合的右锁紧组件；该控制装置结构简单合理,制造成本低、可以自动对压缩式垃圾车推板机构油缸进行控制。(The invention discloses a control device of an oil cylinder of a push plate mechanism of a compression garbage truck, which comprises a valve body, wherein a mounting hole is formed in the valve body, a left end cover is arranged at the left end of the mounting hole of the valve body, a right end cover is arranged at the right end of the mounting hole of the valve body, a left plug hole is formed in the left end cover, and a right plug hole is formed in the right end cover; the side surface of the valve body is provided with a port P, a port A, a port B, a port T1 and a port T2, a valve core is connected in the mounting hole in a sliding manner, the left end of the valve core is provided with a left plunger, and the right end of the valve core is provided with a right plunger; a left valve sleeve sleeved on the left plunger is connected between the left end cover and the valve core in the mounting hole in a sliding manner, and a right valve sleeve sleeved on the plunger is connected between the right end cover and the valve core in a sliding manner; a left locking assembly matched with the left valve sleeve is arranged in the left plunger, and a right locking assembly matched with the right valve sleeve is arranged in the right plunger; the control device has simple and reasonable structure and low manufacturing cost, and can automatically control the oil cylinder of the push plate mechanism of the compression type garbage truck.)
1. A control device of a push plate mechanism oil cylinder of a compression garbage truck comprises a valve body, wherein a mounting hole which penetrates through the left and the right is formed in the valve body, a left end cover is fixedly installed at the left end of the mounting hole of the valve body, a right end cover is fixedly installed at the right end of the mounting hole, a left plug hole with the right end communicated with the mounting hole is formed in the left end cover, and a right plug hole with the left end communicated with the mounting hole is formed in the right end cover; the side surface of the valve body is provided with a port P, a port A, a port B, a port T1 and a port T2 which are communicated with the mounting hole, a valve core is connected in the mounting hole in a sliding way, the left end of the valve core is provided with a left plunger piston extending into the left plug hole, and the right end of the valve core is provided with a right plunger piston extending into the right plug hole; the diameter of the valve core is larger than that of the left plunger and that of the right plunger, and the diameters of the left plunger and the right plunger are the same; a left valve sleeve sleeved on the left plunger is connected between the left end cover and the valve core in the mounting hole in a sliding manner, and a right valve sleeve sleeved on the plunger is connected between the right end cover and the valve core in a sliding manner; when the left end of the valve core is abutted against the left valve sleeve and the left end of the left valve sleeve is abutted against the left end cover, the port P is communicated with the port A, and the port B is communicated with the port T1; when the right end of the valve core abuts against the right valve sleeve and the right end of the right valve sleeve abuts against the right end cover, the port P is communicated with the port B, and the port A is communicated with the port T2;
a left cavity communicated with the port P is formed between the left end of the left plug hole and the left end of the left plunger piston in the left plug hole, and a right cavity communicated with the port P is formed between the right end of the right plug hole and the right end of the right plunger piston in the right plug hole; a left cavity is formed between the left end of the left valve sleeve and the left end cover in the mounting hole, a left cavity communicated with the left cavity is formed between the right end of the left valve sleeve and the valve core, a right cavity is formed between the right end of the right valve sleeve and the right end cover, and a right cavity communicated with the right cavity is formed between the left end of the right valve sleeve and the valve core; a left spring for forcing the left valve sleeve to move leftwards is arranged in the left two cavities, and a right spring for forcing the valve sleeve to move rightwards is arranged in the right two cavities; a left locking assembly matched with the left valve sleeve is arranged in the left plunger, and a right locking assembly matched with the right valve sleeve is arranged in the right plunger; when the port P is communicated with the port A, and the left end of the right valve sleeve abuts against the right end of the valve core, if the pressure of the port A is smaller than or equal to a first set value, the right locking assembly locks the right valve sleeve on the right plunger, the right two cavities are disconnected with the port T2, the left cavity is disconnected with the right cavity, if the pressure of the port A is larger than the first set value, the right locking assembly separates the right valve sleeve from the right plunger, the left cavity is communicated with the right cavity, the right valve sleeve moves rightwards under the action of a right spring, and when the right end of the right valve sleeve abuts against the right end cover, the right cavity is communicated with the port T2; when the P port is communicated with the B port, and the right end of the left valve sleeve abuts against the left end of the valve core, if the pressure of the B port is smaller than or equal to a second set value, the left locking assembly locks the left valve sleeve on the left plunger, the left two cavities are disconnected with the T1 port, the right one cavity is disconnected with the left cavity, if the pressure of the B port is larger than the second set value, the left locking assembly separates the left valve sleeve from the left plunger, the right one cavity is communicated with the left cavity, the left valve sleeve moves leftwards under the action of a left spring, and when the left end of the left valve sleeve abuts against the left end cover, the left two cavities are communicated with the T1 port.
2. The control device of the oil cylinder of the push plate mechanism of the compression garbage truck as claimed in claim 1, wherein the outer circumferential side of the valve core is provided with a left ring groove and a right ring groove, when the left end of the valve core abuts against the left valve sleeve and the left end of the left valve sleeve abuts against the left end cover, the port P is communicated with the port a through the right ring groove, and the port B is communicated with the port T1 through the left ring groove; when the right end of the valve core is abutted to the right valve sleeve and the right end of the right valve sleeve is abutted to the right end cover, the port P is communicated with the port B through the left annular groove, and the port A is communicated with the port T2 through the right annular groove.
3. The control device for the push plate mechanism oil cylinder of the compression type garbage truck as claimed in claim 2, wherein the left locking component comprises a left piston and a left plug, a left mounting groove is arranged in the left plunger along the radial direction, a left locking groove is arranged on the inner side wall of the left valve sleeve along the radial direction, the left piston is connected in the left mounting groove in a sliding manner, the left plug is fixedly mounted at the opening of the left mounting groove, and a left locking rod extending out of the left mounting groove is axially arranged on the left piston along the left mounting groove; a left rod cavity communicated with the left ring groove is formed between the left piston and the bottom of the left mounting groove in the left mounting groove, a left rodless cavity communicated with a T1 port is formed between the left piston and the left plug, and a left spring used for forcing the left piston to move in the direction away from the left plug is arranged in the left rodless cavity; when the left locking assembly locks the left valve sleeve on the left plunger, the left locking rod is inserted into the left locking groove, and when the left locking assembly separates the left valve sleeve from the left plunger, the left locking rod leaves the left locking groove.
4. The control device for the push plate mechanism oil cylinder of the compression garbage truck as claimed in claim 3, wherein the inner side wall of the right valve sleeve is provided with a right communicating groove communicated with the right first cavity, the right plunger, the valve core and the left plunger are internally provided with first through holes communicated with the left mounting groove, and when the left end of the right valve sleeve abuts against the right end of the valve core, the first through holes are communicated with the right communicating groove;
a second through hole for communicating the left cavity and the left mounting groove is formed in the left plunger; the side of the left piston is provided with a left cutting groove, when the left lock rod is inserted into the left lock groove, the left piston moves upwards to separate the first through hole from the second through hole, and when the left lock rod leaves the left lock groove, the left piston moves downwards to communicate the first through hole with the second through hole through the left cutting groove.
5. The control device for the push plate mechanism cylinder of the compression garbage truck as claimed in claim 3, wherein the left plunger is provided with a left second notch on the outer side surface near the left end, the left plunger is provided with a left oil hole for communicating the left second notch with the left rodless cavity, and the left end cover and the valve body are provided with a left oil hole for communicating the left second notch with the T1.
6. The control device for the push plate mechanism oil cylinder of the compression type garbage truck as claimed in claim 2, wherein the right locking component comprises a right piston and a right plug, a right mounting groove is arranged in the right plunger along the radial direction, a right locking groove is arranged on the inner side wall of the right valve sleeve along the radial direction, the right piston is connected in the right mounting groove in a sliding manner, the right plug is fixedly mounted at the opening of the right mounting groove, and a right locking rod extending out of the right mounting groove is axially arranged on the right piston along the right mounting groove; a right rod cavity communicated with the right ring groove is formed between the right piston and the bottom of the right mounting groove in the right mounting groove, a right rodless cavity communicated with a T2 port is formed between the right piston and the right plug, and a right two-spring used for forcing the right piston to move in the direction away from the right plug is arranged in the right rodless cavity; when the right locking assembly locks the right valve sleeve on the right plunger, the right locking rod is inserted into the right locking groove, and when the right locking assembly disengages the right valve sleeve from the right plunger, the right locking rod leaves the right locking groove.
7. The control device for the push plate mechanism oil cylinder of the compression garbage truck as claimed in claim 6, wherein the inner side wall of the left valve sleeve is provided with a left communicating groove communicated with the left first cavity, the left plunger, the valve core and the right plunger are internally provided with a third through hole communicated with the right mounting groove, and when the right end of the left valve sleeve abuts against the left end of the valve core, the third through hole is communicated with the left communicating groove;
a fourth through hole for communicating the right cavity and the right mounting groove is formed in the right plunger; the side surface of the right piston is provided with a right cutting groove, when the right locking rod is inserted into the right locking groove, the right piston moves upwards to separate the third through hole from the fourth through hole, and when the right locking rod leaves the right locking groove, the right piston moves downwards and communicates the third through hole with the fourth through hole through the right cutting groove.
8. The control device for the oil cylinder of the push plate mechanism of the compression type garbage truck as claimed in claim 6, wherein the right plunger is provided with a right two cutting grooves on the outer side surface near the right end, the right plunger is internally provided with a right oil hole for communicating the right two cutting grooves with the right rodless cavity, and the right end cover and the valve body are internally provided with a right two oil hole for communicating the right two cutting grooves with the T2.
9. The control device for the oil cylinder of the push plate mechanism of the compression garbage truck as claimed in claim 1, wherein three left oil holes for communicating the left chamber with the P port are formed in the left end cover and the valve body, and three right oil holes for communicating the right chamber with the P port are formed in the right end cover and the valve body.
Technical Field
The invention belongs to the technical field of garbage trucks, and particularly relates to a control device for an oil cylinder of a push plate mechanism of a compression type garbage truck.
Background
The compression garbage truck has the features of fast transport, flexible maneuvering and no secondary pollution, and is one kind of environmental sanitation truck. The working task of the garbage compression device is to compress garbage into the carriage by using a compression mechanism equipped by the garbage compression device, convey the garbage to a garbage disposal site and push the garbage out of the carriage. At present, a compression type garbage truck in the environmental sanitation market mainly comprises the following parts: the automatic loading device comprises an automobile chassis, a carriage, a push plate mechanism, a hopper, a filling mechanism, a hydraulic system, an electric control system and an auxiliary system thereof. The plate pushing mechanism requires automatic reciprocating motion control of the compression oil cylinder to realize reciprocating compression of garbage, and in the prior art, the compression oil cylinder is controlled to automatically reciprocate by sensing the motion position of the compression oil cylinder through a pressure relay or a travel switch and controlling the reversing of an electromagnetic reversing valve. The principle of the control mode is that electric signal switches are arranged at the starting point and the end point of the motion track of the compression oil cylinder to realize automatic control. Specifically, when the system requires the compression oil cylinder to move, the starting point position travel switch gives an extension electric signal, and the compression oil cylinder extends; when the compression oil cylinder extends to the end point, a travel switch at the end point position gives a retraction electric signal to change the direction of the electromagnetic directional valve, and the oil cylinder retracts; when the reversing valve retracts to the starting position, the starting position forming switch gives out an extending electric signal to reverse the reversing valve, and the oil cylinder preferably extends. Although the prior art can realize the reciprocating control of the compression oil cylinder, the prior art comprises an electromagnetic directional valve, a pressure relay, a control circuit, signal transmission and the like, so that the control is complex, the use cost is high, and the product maintenance in the future is troublesome.
Disclosure of Invention
The invention aims to provide a control device which has simple and reasonable structure and low manufacturing cost and can automatically control an oil cylinder of a push plate mechanism of a compression garbage truck.
In order to achieve the purpose, the invention provides the following technical scheme:
a control device of a push plate mechanism oil cylinder of a compression garbage truck comprises a valve body, wherein a mounting hole which penetrates through the left and the right is formed in the valve body, a left end cover is fixedly installed at the left end of the mounting hole of the valve body, a right end cover is fixedly installed at the right end of the mounting hole, a left plug hole with the right end communicated with the mounting hole is formed in the left end cover, and a right plug hole with the left end communicated with the mounting hole is formed in the right end cover; the side surface of the valve body is provided with a port P, a port A, a port B, a port T1 and a port T2 which are communicated with the mounting hole, a valve core is connected in the mounting hole in a sliding way, the left end of the valve core is provided with a left plunger piston extending into the left plug hole, and the right end of the valve core is provided with a right plunger piston extending into the right plug hole; the diameter of the valve core is larger than the diameters of the left plunger and the right plunger, and the diameters of the left plunger and the right plunger are the same; a left valve sleeve sleeved on the left plunger is connected between the left end cover and the valve core in the mounting hole in a sliding manner, and a right valve sleeve sleeved on the plunger is connected between the right end cover and the valve core in a sliding manner; when the left end of the valve core is abutted against the left valve sleeve and the left end of the left valve sleeve is abutted against the left end cover, the port P is communicated with the port A, and the port B is communicated with the port T1; when the right end of the valve core abuts against the right valve sleeve and the right end of the right valve sleeve abuts against the right end cover, the port P is communicated with the port B, and the port A is communicated with the port T2;
a left cavity communicated with the port P is formed between the left end of the left plug hole and the left end of the left plunger piston in the left plug hole, and a right cavity communicated with the port P is formed between the right end of the right plug hole and the right end of the right plunger piston in the right plug hole; a left cavity is formed between the left end of the left valve sleeve and the left end cover in the mounting hole, a left cavity communicated with the left cavity is formed between the right end of the left valve sleeve and the valve core, a right cavity is formed between the right end of the right valve sleeve and the right end cover, and a right cavity communicated with the right cavity is formed between the left end of the right valve sleeve and the valve core; a left spring for forcing the left valve sleeve to move leftwards is arranged in the left two cavities, and a right spring for forcing the valve sleeve to move rightwards is arranged in the right two cavities; a left locking assembly matched with the left valve sleeve is arranged in the left plunger, and a right locking assembly matched with the right valve sleeve is arranged in the right plunger; when the port P is communicated with the port A, and the left end of the right valve sleeve abuts against the right end of the valve core, if the pressure of the port A is smaller than or equal to a first set value, the right locking assembly locks the right valve sleeve on the right plunger, the right two cavities are disconnected with the port T2, the left cavity is disconnected with the right cavity, if the pressure of the port A is larger than the first set value, the right locking assembly separates the right valve sleeve from the right plunger, the left cavity is communicated with the right cavity, the right valve sleeve moves rightwards under the action of a right spring, and when the right end of the right valve sleeve abuts against the right end cover, the right cavity is communicated with the port T2; when the P port is communicated with the B port, and the right end of the left valve sleeve abuts against the left end of the valve core, if the pressure of the B port is smaller than or equal to a second set value, the left locking assembly locks the left valve sleeve on the left plunger, the left two cavities are disconnected with the T1 port, the right one cavity is disconnected with the left cavity, if the pressure of the B port is larger than the second set value, the left locking assembly separates the left valve sleeve from the left plunger, the right one cavity is communicated with the left cavity, the left valve sleeve moves leftwards under the action of a left spring, and when the left end of the left valve sleeve abuts against the left end cover, the left two cavities are communicated with the T1 port.
In a further technical scheme, a left annular groove and a right annular groove are arranged on the side surface of the outer circumference of the valve core, when the left end of the valve core abuts against the left valve sleeve and the left end of the left valve sleeve abuts against the left end cover, the port P is communicated with the port A through the right annular groove, and the port B is communicated with the port T1 through the left annular groove; when the right end of the valve core is abutted to the right valve sleeve and the right end of the right valve sleeve is abutted to the right end cover, the port P is communicated with the port B through the left annular groove, and the port A is communicated with the port T2 through the right annular groove.
In a further technical scheme, the left locking assembly comprises a left piston and a left plug, a left mounting groove is arranged in the left plunger along the radial direction, a left locking groove is arranged on the inner side wall of the left valve sleeve along the radial direction, the left piston is connected in the left mounting groove in a sliding manner, the left plug is fixedly mounted at an opening of the left mounting groove, and a left locking rod extending out of the left mounting groove is axially arranged on the left piston along the left mounting groove; a left rod cavity communicated with the left ring groove is formed between the left piston and the bottom of the left mounting groove in the left mounting groove, a left rodless cavity communicated with a T1 port is formed between the left piston and the left plug, and a left spring used for forcing the left piston to move in the direction away from the left plug is arranged in the left rodless cavity; when the left locking assembly locks the left valve sleeve on the left plunger, the left locking rod is inserted into the left locking groove, and when the left locking assembly separates the left valve sleeve from the left plunger, the left locking rod leaves the left locking groove.
In a further technical scheme, a right communicating groove communicated with the right cavity is formed in the inner side wall of the right valve sleeve, a first through hole communicated with the left mounting groove is formed in the right plunger, the valve core and the left plunger, and the first through hole is communicated with the right communicating groove when the left end of the right valve sleeve abuts against the right end of the valve core;
a second through hole for communicating the left cavity and the left mounting groove is formed in the left plunger; the side of the left piston is provided with a left cutting groove, when the left lock rod is inserted into the left lock groove, the left piston moves upwards to separate the first through hole from the second through hole, and when the left lock rod leaves the left lock groove, the left piston moves downwards to communicate the first through hole with the second through hole through the left cutting groove.
In a further technical scheme, a left second cutting groove is formed in the outer side face, close to the left end, of the left plunger, a left oil hole used for communicating the left second cutting groove with the left rodless cavity is formed in the left plunger, and a left second oil hole used for communicating the left second cutting groove with the T1 hole is formed in the left end cover and the valve body.
In a further technical scheme, the right locking assembly comprises a right piston and a right plug, a right mounting groove is arranged in the right plunger along the radial direction, a right locking groove is arranged on the inner side wall of the right valve sleeve along the radial direction, the right piston is connected in the right mounting groove in a sliding manner, the right plug is fixedly mounted at an opening of the right mounting groove, and a right locking rod extending out of the right mounting groove is axially arranged on the right piston along the right mounting groove; a right rod cavity communicated with the right ring groove is formed between the right piston and the bottom of the right mounting groove in the right mounting groove, a right rodless cavity communicated with a T2 port is formed between the right piston and the right plug, and a right two-spring used for forcing the right piston to move in the direction away from the right plug is arranged in the right rodless cavity; when the right locking assembly locks the right valve sleeve on the right plunger, the right locking rod is inserted into the right locking groove, and when the right locking assembly disengages the right valve sleeve from the right plunger, the right locking rod leaves the right locking groove.
In a further technical scheme, a left communicating groove communicated with the left cavity is formed in the inner side wall of the left valve sleeve, a third through hole communicated with the right mounting groove is formed in the left plunger, the valve core and the right plunger, and the third through hole is communicated with the left communicating groove when the right end of the left valve sleeve abuts against the left end of the valve core;
a fourth through hole for communicating the right cavity and the right mounting groove is formed in the right plunger; the side surface of the right piston is provided with a right cutting groove, when the right locking rod is inserted into the right locking groove, the right piston moves upwards to separate the third through hole from the fourth through hole, and when the right locking rod leaves the right locking groove, the right piston moves downwards and communicates the third through hole with the fourth through hole through the right cutting groove.
In a further technical scheme, a right two cutting grooves are formed in the outer side face, close to the right end, of the right plunger, a right oil hole used for communicating the right two cutting grooves with a right rodless cavity is formed in the right plunger, and a right two oil hole used for communicating the right two cutting grooves with a T2 opening is formed in the right end cover and the valve body.
In a further technical scheme, three left oil holes used for communicating the left cavity and the P port are formed in the left end cover and the valve body, and three right oil holes used for communicating the right cavity and the P port are formed in the right end cover and the valve body.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages: the structure is simple, the integration level is high, the installation is convenient, and the cost is low; the reciprocating control of the oil cylinder can be completed only by supplying oil, no electric element is needed, the cost is saved, the service life is long, the maintenance is convenient, and the automation degree is high; in addition, the left locking assembly can control the connection or disconnection of the left valve sleeve and the left plunger, and can control the connection or disconnection of the right chamber and the left chamber; similarly, the right locking assembly can control the connection or disconnection of the right valve sleeve and the right plunger, and can control the connection or disconnection of the left chamber and the right chamber, and the left locking assembly and the right locking assembly realize multiple purposes, so that the structure of the invention is more compact.
Drawings
FIG. 1 is a cross-sectional view of the valve cartridge of the present invention as it moves to the left position;
FIG. 2 is a cross-sectional view of the valve cartridge of the present invention during a reversing process;
FIG. 3 is a cross-sectional view of the valve cartridge of the present invention moved to the right;
FIG. 4 is a cross-sectional view of the valve cartridge of the present invention during a reversing procedure;
fig. 5 is an enlarged structural view at C in fig. 2;
fig. 6 is an enlarged structural view at D in fig. 3.
Detailed Description
Referring to fig. 1-6, a control device for an oil cylinder of a push plate mechanism of a compression garbage truck comprises a valve body 2, wherein a mounting hole 21 which penetrates through the valve body 2 from left to right is formed in the valve body 2, a left end cover 3 is fixedly mounted at the left end of the mounting hole 21 of the valve body 2, a right end cover 4 is fixedly mounted at the right end of the mounting hole 21, a left plug hole 31 with the right end communicated with the mounting hole 21 is formed in the left end cover 3, and a
A left cavity 3b is formed between the left end of the left plug hole 31 and the left end of the
When the port P is communicated with the port A, and the left end of the right valve sleeve 7 abuts against the right end of the valve core 1, if the pressure of the port A is smaller than or equal to a first set value, the right locking assembly locks the right valve sleeve 7 on the
The side surface of the outer circumference of the valve core 1 is provided with a
The left locking assembly comprises a
A right communicating groove 71 communicated with the right first cavity 2a is formed in the inner side wall of the right valve sleeve 7, first through holes 1a and 1e communicated with the
The right locking assembly comprises a right piston 5 and a right plug 9, a right mounting groove 191 is formed in the
The inner side wall of the left valve sleeve 8 is provided with a left communicating groove 81 communicated with the left first cavity 2b, third through
As shown in figure 1, the control device of the push plate mechanism oil cylinder of the compression garbage truck has a simple structure of the working principle, the port P is required to be connected with a power oil path before working, the ports T1 and T2 are connected with an oil return path, the port A and the port B are respectively connected with a rodless cavity and a rod cavity of the push plate mechanism oil cylinder, and when the oil path connection is completed, pressure oil is introduced into the port P to start working.
As shown in fig. 1, the position is the initial position of the present invention, the left end of the valve core 1 abuts against the left valve sleeve 8 and the left end of the left valve sleeve 8 abuts against the left end cover 3, the port P communicates with the port a, and the port B communicates with the port T1; pressure oil enters a port P, because the right cavity 2a is a closed cavity at the moment, no oil flows out, the valve core 1 is kept at the position shown in figure 1 in the retraction process of the oil cylinder, the hydraulic oil enters a rodless cavity of the oil cylinder through the port A to push the oil cylinder to extend and compress garbage, after the oil cylinder extends completely, the pressure of the port A rises, if the pressure of the port A is greater than a first set value (the pretightening force of a right two-spring 12), the pressure oil at the port A enters a right rod cavity 5c through a right
When the oil cylinder is completely retracted, the pressure at the port B rises, if the pressure at the port B is greater than a second set value (the pretightening force of the left second spring 11), the pressure oil at the port B enters the
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
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