阅读说明：本技术 一种机械运输嵌入式传送装置 (Embedded conveyer of mechanical transportation ) 是由 王永军 郭阳阳 雷贤卿 王笑一 李伟 吴上玉 于 2020-06-24 设计创作，主要内容包括：本发明提供了一种机械运输嵌入式传送装置,包括支架、传送机构、支撑装置、限位装置及清洁装置；支架包括底板和两个侧板,两个侧板均设置在底板的上方,两个侧板及底板共同围成一个U型结构；传送机构包括电机、两个传动轴及传送带,电机安装在其中一个侧板上,两个传动轴间隔安装在两个侧板之间,电机的输出端与其中一个传动轴相连,两个传动轴的外部均设置有辊筒,传送带绕设在套设有辊筒的两个传动轴的外侧,本专利能够满足不同高度的设备进行对接使用,可以对传送带表面上污垢进行有效清洁,且可以对传送带上的物料进行限位,防止跑偏影响其传送效率。(The invention provides an embedded conveying device for mechanical transportation, which comprises a bracket, a conveying mechanism, a supporting device, a limiting device and a cleaning device, wherein the bracket is fixedly connected with the conveying mechanism; the bracket comprises a bottom plate and two side plates, wherein the two side plates are arranged above the bottom plate, and the two side plates and the bottom plate jointly enclose a U-shaped structure; transport mechanism includes the motor, two transmission shafts and conveyer belt, the motor is installed on one of them curb plate, two transmission shaft intervals are installed between two curb plates, the output of motor links to each other with one of them transmission shaft, the outside of two transmission shafts all is provided with the roller, the conveyer belt is around establishing the outside that is equipped with two transmission shafts of roller, this patent can satisfy the equipment of co-altitude not and dock the use, can effectively clean the dirt on the surface to the conveyer belt, and can carry on spacingly to the material that conveys, prevent that the off tracking from influencing its conveying efficiency.)

1. The utility model provides an embedded conveyer of mechanical transportation, includes support (1), transport mechanism, strutting arrangement, stop device and cleaning device, its characterized in that: the supporting device is arranged below the support (1), the conveying mechanism is arranged on the support (1), the cleaning device is arranged below the conveying mechanism and used for cleaning the conveying mechanism, the limiting device comprises two limiting mechanisms, and the two limiting mechanisms are symmetrically arranged on two sides of the support (1) respectively and used for limiting the conveying process;

the support (1) comprises a bottom plate (101) and two side plates (102), wherein the two side plates (102) are arranged above the bottom plate (101), and the two side plates (102) and the bottom plate (101) jointly form a U-shaped structure;

transport mechanism includes motor (8), two transmission shafts (3) and conveyer belt (6), motor (8) are installed on one of them curb plate (102), two transmission shaft (3) interval is installed between two curb plate (102), the output of motor (8) links to each other with one of them transmission shaft (3), two the outside of transmission shaft (3) all is provided with roller (5), conveyer belt (6) are around establishing the outside of being equipped with two transmission shafts (3) of roller (5).

2. The mechanical transport embedded conveyor as recited in claim 1, further comprising: limiting mechanism includes fixed plate (4) and spacing subassembly (7), fixed plate (4) set up the outside at curb plate (102), I (701) of spout have been seted up at the top of fixed plate (4), are provided with in I (701) of spout and can follow the spout and carry out gliding slider I (702), and the bottom setting of slider I (702) is in I (701) of spout, and spacing subassembly (7) include fly leaf (703) and limiting plate (705), fly leaf (703) set up in the top of slider I (702) and fly leaf (703) can slide along the spout along with slider I (702), limiting plate (705) set up the one end that is close to conveyer belt (6) in fly leaf (703).

3. The mechanical transport embedded conveyor as recited in claim 2, further comprising: the limiting plate (705) is arranged above the movable plate (703) in the vertical direction.

4. The mechanical transport embedded conveyor as recited in claim 2, further comprising: and a hand-screwed bolt (704) is arranged on the movable plate (703).

5. The mechanical transport embedded conveyor as recited in claim 1, further comprising: the supporting device comprises a plurality of upper supporting columns (2) and a plurality of lower supporting mechanisms, wherein the upper supporting columns (2) are arranged below the support (1), the lower supporting mechanisms comprise a plurality of lower supporting components, and the plurality of supporting components are arranged below the upper supporting columns (2) in a one-to-one correspondence manner.

6. The mechanical transport embedded conveyor as recited in claim 5, further comprising: the supporting component comprises a lower supporting column (9), the lower supporting column (9) is arranged below an upper supporting column (2), a cavity (10) is arranged inside the lower supporting column (9), a sliding groove II (1001) is arranged in the cavity (10), the sliding groove II (1001) is arranged along the vertical direction, a sliding block II (1002) capable of sliding along the sliding groove II (1001) is arranged in the sliding groove II (1001), the sliding block II (1002) is connected with the bottom end of a telescopic inner rod (1003), the telescopic inner rod (1003) is arranged in the cavity (10), the telescopic inner rod (1003) can slide along with the sliding block II (1002) along the sliding groove II (1001), and the top end of the telescopic inner rod (1003) is connected with the upper supporting column (2) after penetrating through the cavity (10).

7. The mechanical transport embedded conveyor as recited in claim 6, further comprising: a bearing plate (11) is arranged among the lower support columns (9), a hydraulic telescopic rod (12) is arranged on the bearing plate (11), and the output end of the hydraulic telescopic rod (12) is connected with the bottom of the bottom plate (101).

8. The mechanical transport embedded conveyor as recited in claim 1, further comprising: the cleaning device is arranged below the conveying mechanism and comprises two sliding mechanisms (13) and a cleaning mechanism, the two sliding mechanisms (13) are respectively arranged on the inner sides of the two side plates (102) in a one-to-one correspondence mode, the sliding mechanism (13) comprises a sliding groove III (1301) and a sliding block III (1302), the sliding groove III (1301) is arranged on the inner side of the side plate (102) in the vertical direction, the sliding block III (1302) is arranged in the sliding groove III (1301), the sliding block III (1302) can slide along the sliding groove III (1301), the cleaning mechanism comprises a connecting rod (1303) and a brush (1304) arranged outside the connecting rod (1303), the connecting rod (1303) is arranged below the conveyor belt (6), the connecting rod (1303) and two ends of the connecting rod (1303) are respectively connected with the two sliding blocks III (1302), and the connecting rod (1303) can slide downwards along with the sliding blocks III (1302) in the vertical direction.

9. The mechanical transport embedded conveyor as recited in claim 8, further comprising: a sliding rod (1305) is arranged in the sliding groove III (1301), a spring (1306) is sleeved outside the sliding rod (1305), the sliding block III (1302) is arranged on the sliding rod (1305) in a penetrating mode, and the sliding block III (1302) is arranged above the spring (1306).

Technical Field

The invention relates to the technical field of conveying belts, in particular to an embedded conveying device for mechanical transportation.

Background

The conveyer belt is the device that is used for material to carry that industry is common, and the transfer apparatus in market is of a great variety, and wherein conveyer belt conveying equipment is the most common conveying equipment, but the conveyer belt often leads to the surface dirty because in the transportation, and the material is carrying if carrying on spacing to it simultaneously and then the off tracking very easily, influences the conveying work of material.

The existing conveying belt does not have a mechanism which can automatically lift and adjust the conveying belt, can meet the requirement of butt joint of equipment with different heights, can not effectively remove dirt on the surface of the conveying belt, can not limit the position of materials on the conveying belt, and can prevent deviation from influencing the conveying efficiency.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an embedded conveying device for mechanical transportation, which can meet the requirement of butt joint of equipment with different heights, can effectively clean dirt on the surface of a conveying belt, can limit materials on the conveying belt, and prevents deviation from influencing the conveying efficiency.

The technical scheme adopted by the invention for solving the technical problems is as follows: the mechanical transportation embedded type conveying device comprises a support, a conveying mechanism, a supporting device, a limiting device and a cleaning device, wherein the supporting device is arranged below the support, the conveying mechanism is arranged on the support, the cleaning device is arranged below the conveying mechanism and used for cleaning the conveying mechanism, the limiting device comprises two limiting mechanisms, and the two limiting mechanisms are respectively and symmetrically arranged on two sides of the support and used for limiting the conveying process;

the bracket comprises a bottom plate and two side plates, wherein the two side plates are arranged above the bottom plate, and the two side plates and the bottom plate jointly enclose a U-shaped structure;

the conveying mechanism comprises a motor, two transmission shafts and a conveying belt, the motor is installed on one side plate, the two transmission shafts are installed between the two side plates at intervals, the output end of the motor is connected with one of the two transmission shafts, the rollers are arranged outside the two transmission shafts, and the conveying belt is wound on the outer sides of the two transmission shafts on which the rollers are arranged.

Further, stop gear includes fixed plate and spacing subassembly, the fixed plate sets up the outside at the curb plate, spout I has been seted up at the top of fixed plate, is provided with in the spout I and carries out gliding slider I along the spout, and the bottom setting of slider I is in spout I, and spacing subassembly includes fly leaf and limiting plate, the fly leaf sets up and can slide along the spout along slider I in the top of slider I and fly leaf, the limiting plate sets up the one end that is close to the conveyer belt at the fly leaf.

Further, the limiting plate is arranged above the movable plate in the vertical direction.

Furthermore, a hand-screwed bolt is arranged on the movable plate.

Further, strutting arrangement includes support column and lower supporting mechanism on a plurality of, a plurality of go up the support column setting in the below of support, lower supporting mechanism includes a plurality of under bracing subassembly, a plurality of supporting subassembly one-to-one sets up in the below of last support column.

Further, the supporting component comprises a lower supporting column, the lower supporting column is arranged below the upper supporting column, a cavity is formed in the lower supporting column, a sliding groove II is formed in the cavity, the sliding groove II is arranged in the vertical direction, a sliding block II capable of sliding along the sliding groove II is arranged in the sliding groove II, the sliding block II is connected with the bottom end of the telescopic inner rod, the telescopic inner rod is arranged in the cavity and can slide along the sliding block II along the sliding groove II, and the top end of the telescopic inner rod is connected with the upper supporting column after penetrating through the cavity.

Furthermore, a bearing plate is arranged between the plurality of lower supporting columns, a hydraulic telescopic rod is arranged on the bearing plate, and the output end of the hydraulic telescopic rod is connected with the bottom of the bottom plate.

Further, cleaning device sets up the below at transport mechanism, cleaning device includes two slide mechanism and clean mechanism, and the setting of two slide mechanism one-to-one respectively is in the inboard of two curb plates, and slide mechanism includes spout III and slider III, spout III sets up the inboard at the curb plate in vertical direction, and slider III sets up in spout III and slider III can slide along spout III, clean mechanism includes the connecting rod and sets up the brush in the connecting rod outside, the connecting rod sets up the below at the conveyer belt, and this connecting rod and both ends link to each other with two sliders III respectively and the connecting rod can follow slider III and go on the upper sliding in vertical direction.

Furthermore, a sliding rod is arranged in the sliding groove III, a spring is sleeved outside the sliding rod, the sliding block III is arranged on the sliding rod in a penetrating mode, and the sliding block III is arranged above the spring.

The beneficial effects of the invention are mainly as follows:

1. according to the invention, under the action of the limiting mechanism, when materials to be conveyed are limited, the distance between the two limiting plates can be adjusted according to the lengths of the materials with different sizes, the two hand screws on the two movable plates are loosened respectively, so that the movable plates can slide on the fixed plate, when the distance between the limiting plates connected with the two movable plates meets the requirement that the materials pass through, the hand screws are locked, the bottom ends of the hand screws abut against the inner wall of the sliding groove I of the sliding groove, so that the movable plates are rapidly fixed, and through the arrangement, the distance between the two limiting plates can be effectively adjusted according to the materials with different volumes, so that the materials can be limited in the conveying process, the materials are prevented from deviating, and the conveying efficiency of a conveying belt of the conveying belt is influenced;

2. under the action of the lower supporting mechanism, when the whole support needs to be lifted, a hydraulic pump connected with the outer wall of a hydraulic telescopic rod of the support can be started, the hydraulic pump supplies oil to the inside of the hydraulic telescopic rod, so that the hydraulic telescopic rod is extended, the support is jacked up, telescopic inner rods connected with upper supporting columns on the periphery of the bottom end of the support can be lifted out of the inside of the lower supporting column, the lifting work of the whole support can be met, and the conveyor belt can be conveniently butted and used for corresponding equipment with different heights through the arrangement;

3. according to the invention, under the action of the cleaning device, the brush on the connecting rod can tightly support the middle part of the bottom end conveyed by the brush under the reverse action of the spring, so that when the conveying belt is conveyed, the surface of the conveying belt and the brush are wiped, and the brush can remove dirt on the surface of the conveying belt, thereby ensuring the cleanliness of the conveying belt and prolonging the service life of the conveying belt.

Drawings

FIG. 1 is a schematic view of a portion of the structure of the present invention;

FIG. 2 is a schematic cross-sectional structural view of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

FIG. 4 is an enlarged schematic view of FIG. 2 at B;

the labels in the figure are: 1. the device comprises a bracket, 101, a bottom plate, 102, side plates, 2, upper supporting columns, 3, a transmission shaft, 4, a fixing plate, 5, a roller, 6, a conveyor belt, 7, a limiting component, 701, sliding chutes I and 702, sliding blocks I and 703, a movable plate, 704, a hand-screwed bolt, 705, a limiting plate, 8, a motor, 9, lower supporting columns, 10, a cavity, 1001, sliding chutes II and 1002, and a sliding block II,

1003. the telescopic inner rod, 11, a bearing plate, 12, a hydraulic telescopic rod, 13, a sliding mechanism, 1301, a sliding groove III, 1302, a sliding block III, 1303, a connecting rod, 1304, a brush, 1305, a sliding rod, 1306 and a spring.

Detailed Description

The embodiments of the present invention are described in detail with reference to the accompanying drawings, and the embodiments and specific operations of the embodiments are provided on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.

According to the attached drawings, the embedded conveying device for mechanical transportation comprises a support 1, a conveying mechanism, a supporting device, a limiting device and a cleaning device, wherein the supporting device is arranged below the support 1, the conveying mechanism is arranged on the support 1, the cleaning device is arranged below the conveying mechanism and is used for cleaning the conveying mechanism, and the limiting device comprises two limiting mechanisms;

the support 1 comprises a bottom plate 101 and two side plates 102, wherein the two side plates 102 are arranged above the bottom plate 101, and the two side plates 102 and the bottom plate 101 form a U-shaped structure together;

the conveying mechanism comprises a motor 8, two transmission shafts 3 and a conveying belt 6, wherein the motor 8 is installed on one side plate 102, the transmission shafts 3 are installed between the two side plates 102, the two transmission shafts 3 are arranged between the two side plates 102 in parallel at intervals, the transmission shafts 3 are perpendicular to the side plates 102, the output end of the motor 8 is connected with one of the transmission shafts 3, the rollers 5 are arranged outside the transmission shafts 3, and the conveying belt 6 is arranged on the outer sides of the two transmission shafts 3 sleeved with the rollers 5 in a winding mode. The surface of the conveyor belt 6 is flush with the top end surfaces of the two side plates of the bracket 1, and the conveyor belt 6 is embedded between the two side plates;

the two limiting mechanisms are respectively and symmetrically arranged on two sides of the bracket 1 and used for limiting the conveying process, each limiting mechanism comprises a fixed plate 4 and a limiting assembly 7, the fixed plates 4 are arranged on the outer sides of the side plates 102, the length of each fixed plate 4 is smaller than that of each side plate 102, the two fixed plates 4 are symmetrically arranged on two sides of the bracket, sliding grooves I701 are formed in the tops of the fixed plates 4, sliding blocks I702 capable of sliding along the sliding grooves are arranged in the sliding grooves I701, the bottom ends of the sliding blocks I702 are arranged in the sliding grooves I701, each limiting assembly 7 comprises a movable plate 703 and a limiting plate 705, the movable plate 703 is arranged above the sliding blocks I702, the movable plate 703 can slide along the sliding grooves along with the sliding blocks I702, the movable plate 703 is fixedly connected with the tops of the sliding blocks I702, and hand-screwed bolts 704 are connected,

the movable plate 703 forms a sliding structure through the slider I702 and the sliding grooves I701 and the fixed plate 4, the length of the movable plate 703 is equal to that of the fixed plate 4, the thickness of the movable plate 703 is smaller than that of the fixed plate 4, the two sliding grooves I701 are respectively symmetrical about the central axis of the fixed plate 4, the sliding grooves I701 are perpendicular to the conveying direction of the conveyor belt, threaded holes penetrating through the movable plate 703 and the inside of the slider I702 are formed, and the bottom end of the hand-screwing bolt 704 abuts against the inner wall of the sliding groove I701 through screwing the hand-screwing bolt 704.

The limiting plate 705 is disposed at one end of the movable plate 703 close to the conveyor belt 6. The restriction plate 705 is disposed above the movable plate 703 in the vertical direction. The length of limiting plate 705 equals with the length of support 1, and the bottom face of limiting plate 705 and the upper surface laminating of conveyer belt 6 simultaneously to two limiting plate 705 relative faces are provided with the protection pad, avoid leading to the damage of its material among the material transfer process.

The supporting device comprises a plurality of upper supporting columns 2 and a plurality of lower supporting mechanisms, wherein the upper supporting columns 2 are arranged below the support 1, the number of the upper supporting columns 2 is four, the four upper supporting columns 2 are distributed around the bottom of the bottom plate 101, the lower supporting mechanisms comprise a plurality of lower supporting components, and the plurality of supporting components are arranged below the upper supporting columns 2 in a one-to-one mode.

The supporting component comprises a lower supporting column 9, the lower supporting column 9 is arranged below an upper supporting column 2, a cavity 10 is arranged inside the lower supporting column 9, a sliding groove II 1001 is formed in the cavity 10, the sliding groove II 1001 is arranged along the vertical direction, a sliding block II 1002 capable of sliding along the sliding groove II 1001 is arranged in the sliding groove II 1001, the sliding block II 1002 is connected with the bottom end of a telescopic inner rod 1003, the telescopic inner rod 1003 is arranged in the cavity 10, the telescopic inner rod 1003 can slide along the sliding groove II 1001 along with the sliding block II 1002, and the top end of the telescopic inner rod 1003 penetrates through the cavity 10 and then is connected with the upper supporting column 2.

Sliding grooves II 1001 are symmetrically arranged on two sides of the inner wall of the cavity 10, sliding blocks II 1002 are arranged inside the two sliding grooves II 1001 in a sliding mode, a telescopic inner rod 1003 is fixedly connected between the two sliding blocks II 1002,

for fixed connection between the top of pole 1003 in the flexible and the bottom of last support column 2, and pole 1003 in the flexible constitutes extending structure through slider II 1002, II 1001 of spout and bottom suspension mast 9, and when the hydraulic pump through starting, can input hydraulic oil into the inside of hydraulic telescoping rod 12 to make hydraulic telescoping rod 12 extend, thereby make support 1 can rise.

A bearing plate 11 is fixedly connected between the outer walls of the four lower support columns 9, the bearing plate 11 is arranged between the plurality of lower support columns 9, a hydraulic telescopic rod 12 is arranged on the bearing plate 11, the output end of the hydraulic telescopic rod 12 is connected with the bottom of the bottom plate 101, a hydraulic telescopic rod 12 is fixedly connected between the middle of the top end of the bearing plate 11 and the middle of the bottom end of the support 1, the outer wall of the hydraulic telescopic rod 12 is connected with a hydraulic pump in the prior art, and hydraulic oil can be input into the hydraulic telescopic rod 12 by starting the hydraulic pump, so that the hydraulic telescopic rod;

the cleaning device is arranged below the conveying mechanism and comprises two sliding mechanisms 13 and cleaning mechanisms, the two sliding mechanisms 13 are respectively arranged on the inner sides of the two side plates 102 in a one-to-one correspondence mode, each sliding mechanism 13 comprises a sliding groove III 1301 and a sliding block III 1302, the sliding grooves III 1301 are arranged on the inner sides of the side plates 102 in the vertical direction, the sliding blocks III 1302 are arranged in the sliding grooves III 1301, the sliding blocks III 1302 can slide along the sliding grooves III 1301, each cleaning mechanism comprises a connecting rod 1303 and a brush 1304 arranged outside the connecting rod 1303, the connecting rod 1303 is arranged below the conveying belt 6, and the connecting rod 1303 and two ends of the connecting rod 1303 are respectively connected with the two sliding blocks III 1302, and the connecting rod 1303 can slide downwards along with the sliding blocks III 1302 in the vertical direction.

A sliding rod 1305 is arranged in the sliding groove III 1301, a spring 1306 is sleeved outside the sliding rod 1305, the sliding block III 1302 is arranged on the sliding rod 1305 in a penetrating mode, and the sliding block III 1302 is arranged above the spring 1306. The inside of the sliding block III 1302 is provided with a sleeve hole which is convenient for sleeving the sliding rod 1305, the sliding block III 1302 can slide in the sliding groove III 1301 and can move on the sliding rod 1305, and the sliding groove III 1301 is arranged at the position of the center line of the inner side of the side plate.

Connecting rod 1303 passes through slider III 1302 and link III 1301 and constitutes sliding structure, and smooth III 1302 passes through spring 1306 and link III 1301 and constitutes elastic construction, and the length of connecting rod 1303 is longer than the length of brush 1304, and the length of its brush 1304 is bigger than the width of conveyer belt 6, and brush 1304 can set up to flexible long brush 1304, avoids causing the damage to conveyer belt 6.

The working principle is as follows: when the device is used, a user can respectively loosen the two hand-screwed bolts 704 on the two movable plates 703 to enable the movable plates 703 to slide on the fixed plate 4, when the distance between the limiting plates 705 connected with the two movable plates 703 meets the requirement that materials pass through the device, the hand-screwed bolts 704 are locked, the bottom ends of the hand-screwed bolts 704 abut against the inner wall of the sliding grooves I701, so that the movable plates 703 are rapidly fixed, through the arrangement, the distance between the two limiting plates 705 can be effectively adjusted according to the materials with different volumes, the materials are convenient to limit in the conveying process, the materials are prevented from deviating to influence the conveying efficiency of the conveying belt 6, and when the conveying belt 6 is conveyed, the surface of the conveying belt 6 is wiped with the brush 1304, so that the brush 1304 can clean dirt on the surface of the conveying belt 6, thereby guaranteeing the cleanliness of the conveyor belt 6 and prolonging the service life of the conveyor belt 6.

According to the invention, under the action of the limiting mechanism, when materials to be conveyed are limited, the distance between the two limiting plates can be adjusted according to the lengths of the materials with different sizes, the two hand screws on the two movable plates are loosened respectively, so that the movable plates can slide on the fixed plate, when the distance between the limiting plates connected with the two movable plates meets the requirement that the materials pass through, the hand screws are locked, the bottom ends of the hand screws abut against the inner wall of the sliding groove I of the sliding groove, so that the movable plates are rapidly fixed, and through the arrangement, the distance between the two limiting plates can be effectively adjusted according to the materials with different volumes, so that the materials can be limited in the conveying process, the materials are prevented from deviating, and the conveying efficiency of a conveying belt of the conveying belt is influenced;

under the action of the lower supporting mechanism, when the whole support needs to be lifted, a hydraulic pump connected with the outer wall of a hydraulic telescopic rod of the support can be started, the hydraulic pump supplies oil to the inside of the hydraulic telescopic rod, so that the hydraulic telescopic rod is extended, the support is jacked up, telescopic inner rods connected with upper supporting columns on the periphery of the bottom end of the support can be lifted out of the inside of the lower supporting column, the lifting work of the whole support can be met, and the conveyor belt can be conveniently butted and used for corresponding equipment with different heights through the arrangement;

according to the invention, under the action of the cleaning device, the brush on the connecting rod can tightly support the middle part of the bottom end conveyed by the brush under the reverse action of the spring, so that when the conveying belt is conveyed, the surface of the conveying belt and the brush are wiped, and the brush can clean dirt on the surface of the conveying belt, so that the cleanliness of the conveying belt is ensured, and the service life of the conveying belt is prolonged;

the conveyer of this patent can carry to multiple material, has realized the multi-purpose function of a thing of the device, has enlarged application range.

It is further noted that relational terms such as i, ii, and iii may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.