[background technology]
Prior art is assembled to method on the armature spindle with commutator, be mostly with pneumatic equipment or hydraulic press by universal fixturing with armature spindle and commutator specification requirement coaxial line in accordance with regulations be assembled together, it is poor to make the line embedding groove of rotor core and interval trough between each commutator segment of corresponding commutator form certain orientation angles with respect to the same datum level by common axis line, and its accuracy directly influences performance indications such as rotating speed of motor, electric current, power and commutation spark.
Prior art is assembled to universal fixturing on the armature spindle with commutator, comprises pressure head and angle-adjusting mechanism, and described pressure head is fixed on the piston rod of pneumatic equipment or hydraulic press; Referring to Fig. 5, after the azimuth difference between the line embedding groove 111 of having determined rotor iron core 11 when described angle-adjusting mechanism and the commutator segment interval trough 121 of corresponding commutator 12, make described pressure head act on 131 places, armature spindle 13 rear ends, it is fixing that armature spindle 13 front ends 132 are pressed in commutator 12 centre bores.
Described prior art angle-adjusting mechanism is actually angle base of a certain constant bearing differential seat angle, this angle base is that the azimuth difference that has designed between the commutator segment interval trough according to the line embedding groove of rotor core and corresponding commutator is made, particularly. each orientation angles difference all must be done angle base, and different azimuth angle difference need be done different angle bases; As shown in Figure 6, the orientation angles difference that designs between the line embedding groove 111 of rotor core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 0 °, just needs to make one 0 ° angle base; As shown in Figure 7, the orientation angles difference that designs between the line embedding groove 111 of rotor core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 3 °, just needs to make one 3 ° angle base; As shown in Figure 8, the orientation angles difference that designs between the line embedding groove 111 of rotor core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 8 °, just needs to make one 8 ° angle base; As shown in Figure 9, the orientation angles difference that designs between the line embedding groove 111 of rotor core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 11 °, just needs to make one 11 ° angle base; Even and the orientation angles difference between the commutator segment interval trough of the line embedding groove of the rotor rotor core of various outer diameter and corresponding commutator is identical also needs to do different angle bases; So, just must make a lot of angle bases and could satisfy the production needs, and need transfer again separately machine for different angle base, and so just need the many time accent machines of cost, therefore use the universal fixturing of described angle base to operate just very loaded down with trivial details.
At above-mentioned the deficiencies in the prior art part the applicant on March 16th, 2009, applied for that name is called the utility model patent of " commutator is assembled to special fixture on the armature spindle ", its application number is 200920135571.0, and Granted publication number is CN201423607; Referring to Fig. 4 and Fig. 5, this utility model patent special fixture comprises pressure head 20 and angle-adjusting mechanism 30; Described angle-adjusting mechanism 30 comprises base 31, commutator fixed block 32 and rotor core fixed block 33, they are from bottom to top successively by common central axis mount, and described two fixed blocks 32 of azimuth difference rotation adjustment between the line embedding groove 111 of the rotor core 11 that described commutator fixed block 32 and rotor core fixed block 33 will be determined according to design and the commutator segment interval trough 121 that will be assemblied in the commutator 12 on the armature spindle 13, one of 33 angular displacement, this two fixed block 32 of make suring, azimuth difference between 33 meets design code and is fixed on the described base 31; The described commutator 12 that will be assemblied on the armature spindle 13 is put on the described commutator fixed block 32, made its location and fixing; The armature spindle 13 that will be fixed with described rotor core 11 again is placed on the described rotor core fixed block 33, makes its location and fixing; Make described pressure head 20 act on 131 places, described armature spindle 13 rear ends, it is fixing that described armature spindle 13 front ends 132 are pressed in described commutator 12 centre bores.How many orientation angles differences though this special fixture has solved between the commutator segment interval trough of the line embedding groove of rotor core and corresponding commutator is is spent, all can use this special fixture that commutator is fixed on the armature spindle, do not need to make separately more corresponding angle base, and saved the time of transferring machine, but this special fixture only is fit to the commutator and the rotor core of same model or close model, be commutator and the rotor core that outside specification is identical or be more or less the same, versatility is not strong; When the outside specification of commutator and rotor core differs big, must make the special fixture that is complementary with them again by the outside specification of commutator and rotor core, will cause special fixture quantity many like this, the cost height.
[utility model content]
The technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and provides a kind of commutator is assembled to universal fixturing on the armature spindle, this universal fixturing is suitable for the assembling of the commutator and the rotor core of all small-sized micro machines, highly versatile, and spend no matter how many orientation angles differences between the commutator segment interval trough of the line embedding groove of rotor core and corresponding commutator is, all can use this universal fixturing that commutator is fixed on the armature spindle, do not need to make separately again the special fixture of corresponding angle base or different model, saved time and the cost of making each special fixture.
The technical scheme that the utility model solve the technical problem employing is:
Provide a kind of commutator is assembled to universal fixturing on the armature spindle, comprise pressure head and angle-adjusting mechanism, described angle-adjusting mechanism comprises base; Described angle-adjusting mechanism also comprises commutator locating piece, rotor core locating piece, angular turn piece, is fixed on column and armature spindle locating piece on this angular turn piece; Described base comprise bottom, the cylindrical step that connects with this bottom and with the adaptive central through hole of described armature spindle locating piece, this cylindrical step is provided with breach; Described commutator locating piece end is provided with the spacing raised line adaptive with the commutator segment interval trough of commutator to be assembled, this commutator locating piece can be arranged in the breach of cylindrical step of described base with moving radially, and the spacing raised line on it points to the central through hole of described base; Described armature spindle locating piece is arranged in the central through hole of described base, which is provided with the central through hole that passes through for armature spindle front end to be assembled, this two central through hole has common central axis, and this central axis is in the vertical plane of the center of the spacing raised line of described commutator locating piece; Described rotor core locating piece can be arranged on the described column with moving radially; Described angular turn piece is arranged on the cylindrical step of described base versatilely, can rotate around the central axis of the central through hole of described base; The described angular turn piece of azimuth difference rotation adjustment between the line embedding groove of the rotor core of determining according to design and the commutator segment interval trough that will be assemblied in the commutator on the armature spindle is fixed on described angular turn piece on the cylindrical step of described base after making described rotor core locating piece meet design code with respect to the azimuth difference between the spacing raised line of described commutator locating piece again.
Described angle-adjusting mechanism also comprises pointer, and this pointer is fixed on described angular turn piece outer surface behind; Described upper base surface is provided with dial, comprises the zero degree line, and is positioned at the deviate of the vertical plane of described zero degree line left side and the described base central axis of right side process with respect to this zero degree line; Dial on the central through hole of described base and the described bottom is central axis altogether, and the spacing raised line of described commutator locating piece is through the vertical plane of described central axis and the zero degree line coplane of described dial.
Described column upper end has the setting groove, and this upper end, setting groove two sides is respectively equipped with screwed hole; Described rotor core locating piece comprises fixed block and limited block; Described limited block head is provided with the adaptive spacing raised line of notch with the line embedding groove of rotor core to be assembled; Described fixed block cross section is "T"-shaped, comprises moving part and head; Described limited block is arranged on the head of described fixed block, the moving part of described fixed block can be arranged in the setting groove of described column with moving radially, after the moving part of described fixed block moves to correct position, described fixed block is fixed in the setting groove of described column pass each screwed holes of described setting groove two sides by screw after.
The head of described fixed block has the setting groove, and described limited block embeds in this setting groove, and the spacing raised line of its head stretches out forward, and described limited block and described setting groove are tight fit.
Described commutator locating piece upper lateral part outwards is provided with fixed part, and this fixed part is provided with deep-slotted chip breaker; The cylindrical step upper surface of described base is provided with and the corresponding screwed hole of described deep-slotted chip breaker near near its above breach, described commutator locating piece radially moves to correct position in the breach of described cylindrical step after, with screw described commutator locating piece is fixed in the screw hole of cylindrical step upper surface correspondence of described base by the deep-slotted chip breaker of the fixed part of described commutator locating piece again.
Described angular turn piece is the semicircular ring cylindricality, be included in following rotation semicircular ring cylinder that the cylindrical step cylindrical periphery of described base rotates and the cylindrical step upper surface of described base rotate on rotate the semicircular ring cylinder, rotate the semicircular ring cylinder this on and be provided with central through hole and be total to the left and right deep-slotted chip breaker of central axis with this central through hole; The cylindrical step upper surface of described base is provided with and the corresponding screwed hole of described left and right deep-slotted chip breaker; Rotation semicircular ring cylinder and last rotation semicircular ring cylinder rotated on the cylindrical step of described base under described angular turn piece relied on, after turning to correct position, with each screw described angular turn piece is fixed in the screw hole of cylindrical step upper surface correspondence of described base by the described left and right deep-slotted chip breaker that go up to rotate on the semicircular ring cylinder again.
Compare with prior art, the utility model is the beneficial effect that commutator is assembled to the universal fixturing on the armature spindle:
Owing to be provided with commutator locating piece that can move radially and the rotor core locating piece that can move radially, this universal fixturing is suitable for the assembling of the commutator and the rotor core of all small-sized micro machines, highly versatile, and spend no matter how many orientation angles differences between the commutator segment interval trough of the line embedding groove of rotor core and corresponding commutator is, all can use this universal fixturing that commutator is fixed on the armature spindle, do not need to make separately again the special fixture of corresponding angle base or different model, saved time and the cost of making each special fixture.
[description of drawings]
Fig. 1 is the axonometric projection schematic diagram that the utility model is assembled to commutator the universal fixturing on the armature spindle, the rotor assembly 10 that drawn among the figure, the spacing raised line 521 on the commutator locating piece 52 does not also insert in the commutator segment interval trough 121 of commutator to be assembled 12;
Fig. 2 is the axonometric projection schematic diagram of the angle-adjusting mechanism of described universal fixturing, and rotor assembly 10 has drawn among the figure;
Fig. 3 is the axonometric projection schematic diagram of described angle-adjusting mechanism decomposing state, and rotor assembly 10 has drawn among the figure;
Fig. 4 is the axonometric projection schematic diagram that prior art is assembled to commutator the special fixture on the armature spindle;
Fig. 5 is the axonometric projection schematic diagram of rotor assembly 10, and figure rotor iron core 11, preceding insulating support 14, back insulating support 15, commutator 12 all are fixed on the armature spindle 13;
Fig. 6 is the assembly 10 of rotor described in Fig. 5 from one of front view of commutator 12 end projections, and the orientation angles difference that designs between the line embedding groove 111 of figure rotor iron core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 0 °;
Fig. 7 is the assembly 10 of rotor described in Fig. 5 from two of the front view of commutator 12 end projections, and the orientation angles difference that designs between the line embedding groove 111 of figure rotor iron core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 3 °;
Fig. 8 is the assembly 10 of rotor described in Fig. 5 from three of the front view of commutator 12 end projections, and the orientation angles difference that designs between the line embedding groove 111 of figure rotor iron core 11 and the commutator segment interval trough 121 of corresponding commutator 12 is 8 °;
Fig. 9 is the assembly 10 of rotor described in Fig. 5 from four of the front view of commutator 12 end projections, and the orientation angles difference that designs between the commutator segment interval trough 121 of the line embedding groove 111 of figure rotor iron core 11 and corresponding commutator 12 is 11.0 °.
[specific embodiment]
Below in conjunction with each accompanying drawing the utility model is described in further detail.
Referring to Fig. 1 to Fig. 3 and Fig. 5, a kind of commutator is assembled to universal fixturing on the armature spindle, comprise pressure head 20 and angle-adjusting mechanism 50, described angle-adjusting mechanism 50 comprises base 51; Described angle-adjusting mechanism 50 also comprises commutator locating piece 52, rotor core locating piece 53, angular turn piece 54, is fixed on column 55 and armature spindle locating piece 56 on this angular turn piece 54, and these armature spindle locating piece 56 preferred design become cylindrical; Described base 51 comprises bottom 511, the cylindrical step 512 that connects with this bottom 511 and the central through hole 513 adaptive with described armature spindle locating piece 56, and this cylindrical step 512 is provided with breach 5121, and this bottom 511 also preferred design becomes cylindrical; Described commutator locating piece 52 ends are provided with the spacing raised line 521 adaptive with the commutator segment interval trough 121 of commutator to be assembled 12, this commutator locating piece 52 can be arranged in the breach 5121 of cylindrical step 512 of described base 51 with moving radially, and the spacing raised line 521 on it points to the central through hole 513 of described base 51; Described armature spindle locating piece 56 is arranged in the central through hole 513 of described base 51, which is provided with the central through hole 561 that passes through for armature spindle 13 front ends 132 to be assembled, this two central through hole 513,561 have common central axis, and this central axis is in the center vertical plane of the spacing raised line 521 of described commutator locating piece 52, and the internal diameter of central through hole 561 is bigger than the external diameter of 132 positions of armature spindle 13 front ends to be assembled; Described rotor core locating piece 53 can be arranged on the described column 55 with moving radially; Described angular turn piece 54 is arranged on the cylindrical step 512 of described base 51 versatilely, can rotate around the central axis of the central through hole 513 of described base 51; The described angular turn piece 54 of azimuth difference rotation adjustment between the line embedding groove 111 of the rotor core of determining according to design 11 and the commutator segment interval trough 121 that will be assemblied in the commutator 12 on the armature spindle 13 is fixed on described angular turn piece 54 on the cylindrical step 512 of described base 51 after making described rotor core locating piece 53 meet design code with respect to the azimuth difference between the spacing raised line 521 of described commutator locating piece 52 again.
The described commutator 12 that will be assemblied on the armature spindle 13 is put on the described armature spindle locating piece 56, armature spindle 13 heads that are fixed with described rotor core 11 are tentatively inserted in commutator 12 centre bores, make described rotor core 11 location and fixing by described rotor core locating piece 53, make commutator 12 location and fixing by described commutator locating piece 52; Make described pressure head 20 act on 131 places, described armature spindle 13 rear ends, it is fixing that described armature spindle 13 front ends 132 are pressed in described commutator 12 centre bores.
Referring to Fig. 1 to Fig. 3, described angle-adjusting mechanism 50 also comprises pointer 57, and this pointer 57 is fixed on described angular turn piece 54 outer surface behind, and this pointer 57 also can directly be made of one with described angular turn piece 54; Described bottom 511 upper surfaces are provided with dial 5111, comprise the zero degree line, and are positioned at the deviate of the vertical plane of described zero degree line left side and described base 51 central axis of right side process with respect to this zero degree line; The central through hole 513 of described base 51 and the dial on the described bottom 511 5111 be central axis altogether, and the spacing raised line 521 of described commutator locating piece 52 is through the vertical plane of described central axis and the zero degree line coplane of described dial 5111.
Referring to Fig. 1 to Fig. 3 and Fig. 5, described column 55 upper ends have erects groove 551, and these 552,553 upper ends, setting groove 551 two sides are respectively equipped with screwed hole 554; Described rotor core locating piece 53 comprises fixed block 531 and limited block 532; Described limited block 532 heads are provided with the adaptive spacing raised line 5321 of notch with the line embedding groove 111 of rotor core 11 to be assembled; Described fixed block 531 cross sections are "T"-shaped, comprise moving part 5311 and head 5312; Described limited block 532 is arranged on the head 5312 of described fixed block 531, the moving part 5311 of described fixed block 531 can be arranged in the setting groove 551 of described column 55 with moving radially, after the moving part 5311 of described fixed block 531 moves to correct position, described fixed block 531 is fixed in the setting groove 551 of described column 55 pass each screwed holes 554 of described setting groove 551 two sides 552,553 by screw 581 after.
Referring to Fig. 3, the head 5312 of described fixed block 531 has erects groove 53121, and described limited block 532 embeds this and erects in the groove 53121, and the spacing raised line 5321 of its head stretches out forward, and described limited block 532 is a tight fit with described setting groove 53121.
Referring to Fig. 1 to Fig. 3, described commutator locating piece 52 upper lateral parts outwards are provided with fixed part 522, and this fixed part 522 is provided with deep-slotted chip breaker 5221, and this fixed part 522 can be arranged on commutator locating piece 52 left upper portion or right upper portion; The above is provided with and described deep-slotted chip breaker 5221 corresponding screwed holes 5124 near lacking 5121 cylindrical step 512 upper surfaces of described base 51 near it, described commutator locating piece 52 radially moves to correct position in the breach 5121 of described cylindrical step 512 after, described commutator locating piece 52 is fixed in the screw hole 5124 of cylindrical step 512 upper surface correspondences of described base 51 by the deep-slotted chip breaker 5221 usefulness screws 583 of the fixed part 522 of described commutator locating piece 52 again.
Referring to Fig. 1 to Fig. 3, described angular turn piece 54 is the semicircular ring cylindricality, be included in following rotation semicircular ring cylinder 541 that the cylindrical step 512 cylindrical peripheries of described base 51 rotate and cylindrical step 512 upper surfaces of described base 51 rotate on rotate semicircular ring cylinder 542, rotate semicircular ring cylinder 542 this on and be provided with central through hole 5421 and be total to the left and right deep-slotted chip breaker 5422,5423 of central axis with this central through hole 5421; Cylindrical step 512 upper surfaces of described base 51 are provided with and described left and right deep-slotted chip breaker 5422,5423 corresponding screwed holes 5122,5123; Rotation semicircular ring cylinder 541 and last rotation semicircular ring cylinder 542 rotated on the cylindrical step 512 of described base 51 under described angular turn piece 54 relied on, after turning to correct position, described angular turn piece 54 is fixed in the screw hole 5122,5123 of cylindrical step 512 upper surface correspondences of described base 51 by described each screw 582 of left and right deep-slotted chip breaker 5422,5423 usefulness that go up to rotate on the semicircular ring cylinder 542 again.
Referring to Fig. 1 to Fig. 3 and Fig. 5, in general, commutator 12 specifications of small-sized micro machine are basic identical, and commutator segment interval trough 121 width dimensions on it are also basic identical, so commutator locating piece 52 can not change; If the commutator segment interval trough 121 width dimensions difference of commutator 12 are bigger, commutator locating piece 52 need only be changed and get final product, make the commutator segment interval trough 121 of the spacing raised line 521 of commutator locating piece 52 ends and commutator 12 to be assembled adaptive.
Notch to the line embedding groove 111 of the rotor core 11 of different size, the limited block 532 that also need only change with the adaptive described rotor core locating piece 53 of the notch of the line embedding groove 111 of this rotor core 11 gets final product, and makes the spacing raised line 5321 of these limited block 532 heads adaptive with the notch of the line embedding groove 111 of rotor core 11 to be assembled.
To armature spindle 13 front ends 132 of different size, also need only change armature spindle locating piece 56 and get final product, make the internal diameter of the central through hole 561 on this armature spindle locating piece 56 bigger slightly than the external diameter of 132 positions of armature spindle 13 front ends to be assembled.
Referring to Fig. 1 to Fig. 9, describe below and use the utility model universal fixturing that commutator is assembled to step on the armature spindle:
One, the utility model universal fixturing is installed on pneumatic equipment or the hydraulic press:
1. described pressure head 20 is fixed on the piston rod of pneumatic equipment or hydraulic press;
2. described angle-adjusting mechanism 50 is fixed on the workbench of this pneumatic equipment or hydraulic press.
Two, select suitable commutator locating piece 52 for use according to the width dimensions of the commutator segment interval trough 121 of commutator 12, the spacing raised line 521 that makes commutator locating piece 52 ends is adaptive with the commutator segment interval trough 121 of commutator 12 to be assembled; Select the limited block 532 of suitable rotor core locating piece 53 for use according to the width dimensions of the notch of the line embedding groove 111 of rotor core 11, make the spacing raised line 5321 of these limited block 532 heads adaptive with the notch of the line embedding groove 111 of rotor core 11 to be assembled; External diameter according to 132 positions of armature spindle 13 front ends is selected suitable armature spindle locating piece 56 for use, makes the central through hole 561 of this armature spindle locating piece 56 can allow armature spindle 13 front ends 132 pass through.
Three, accent machine, promptly the azimuth difference that has designed between the commutator segment interval trough 121 according to the line embedding groove 111 of rotor core 11 and corresponding commutator 12 is fixed on described angular turn piece 54 on the cylindrical step 512 of described base 51; As shown in Figure 6, if the orientation angles difference that designs between the commutator segment interval trough 121 of the line embedding groove 111 of described rotor core 11 and corresponding commutator 12 is 0 °, just with described angular turn piece 54 rotations, make the finger tip of the described pointer 57 on it point to the zero degree line place of the bottom 511 upper surface dials 511 of described base 51, and pass a left side of rotating on the described angular turn piece 54 on the semicircular ring cylinder 542 with each screw 582, right deep-slotted chip breaker 5422, be screwed into the screw hole 5122 of cylindrical step 512 correspondences of described base 51 after 5423, in 5123 described angular turn piece 54 is fixed.
When the described angular turn piece 54 of rotation, it is to turn clockwise that the directionality of paying special attention to the orientation angles difference that designs between will the commutator segment interval trough 121 according to the line embedding groove 111 of described rotor core 11 and corresponding commutator 12 is selected, and still is rotated counterclockwise.
Four, assembling:
1. commutator 12 heads are put on the armature spindle locating piece 56 of described angle-adjusting mechanism 50 down;
The rotor front end that 2. rotor core 11 and armature spindle 13 will be housed down, armature spindle 13 heads are tentatively inserted in commutator 12 centre bores, make described rotor core 11 location and fixing by described rotor core locating piece 53, be that described spacing raised line 5321 plays location, fixing and guiding in the notch of the spacing raised line 5321 of limited block 532 heads of described rotor core locating piece 53 line embedding groove 111 that inserts described rotor core 11; Make commutator 12 location and fixing by described commutator locating piece 52, the spacing raised line 521 of promptly described commutator locating piece 52 inserts in the commutator segment interval trough 121 of described commutator 12, and described spacing raised line 521 also plays location, fixing and guiding;
3. start described pneumatic equipment or hydraulic press, making the piston rod of described pneumatic equipment or hydraulic press carry described pressure head 20 moves downward, make described pressure head 20 act on 131 places, described armature spindle 13 rear ends, it is fixing that described armature spindle 13 front ends 132 are pressed in described commutator 12 centre bores;
4. operate described pneumatic equipment or hydraulic press, make the piston rod of described pneumatic equipment or hydraulic press carry described pressure head 20 and move upward, the rotor assembly 10 that assembles described commutator 12 is taken out getting final product from described angle-adjusting mechanism 50.
Repeating step four, the commutator that the next one is to be assembled is assembled on the armature spindle.
If the azimuth difference between the commutator segment interval trough 121 of the line embedding groove 111 of rotor core 11 and corresponding commutator 12 has change, need only repeating step three and four, do not need again corresponding angle base of making in addition.
If the width dimensions of the notch of the width dimensions of the commutator segment interval trough 121 of commutator 12, the line embedding groove 111 of rotor core 11 and/or the external diameter of 132 positions of armature spindle 13 front ends change, when the limited block 532 of corresponding commutator locating piece 52, rotor core locating piece 53 and/or armature spindle locating piece 56 are not suitable for, then change the limited block 532 and/or the armature spindle locating piece 56 of suitable commutator locating piece 52, rotor core locating piece 53, need repeating step two, three and four this moment, do not need to make in addition more corresponding special fixture.
Referring to Fig. 1 to Fig. 9, the utility model can be adjusted the angle-adjusting mechanism 50 that commutator is assembled to the universal fixturing on the armature spindle and fixing according to the orientation angles difference between the commutator segment interval trough 121 of the line embedding groove 111 of different rotor iron core 11 and corresponding commutator 12; Therefore no matter how many orientation angles differences between the commutator segment interval trough 121 of the line embedding groove 111 of rotor core 11 and corresponding commutator 12 is spend, all can use this universal fixturing that commutator 20 is fixed on the armature spindle 13, do not need to make separately more corresponding angle base, and saved the time of transferring machine, very easy to use; And owing to be provided with commutator locating piece that can move radially and the rotor core locating piece that can move radially, this universal fixturing is suitable for the assembling of the commutator and the rotor core of all small-sized micro machines, highly versatile, do not need to make separately again the special fixture of different model, saved time and the cost of making each special fixture.
The above embodiment has only expressed preferred implementation of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim; Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model; Therefore, all equivalents and modifications of being done with the utility model claim scope all should belong to the covering scope of the utility model claim.