CN101314191B - Dynamic tools - Google Patents
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- Publication number
- CN101314191B CN101314191B CN2007100227852A CN200710022785A CN101314191B CN 101314191 B CN101314191 B CN 101314191B CN 2007100227852 A CN2007100227852 A CN 2007100227852A CN 200710022785 A CN200710022785 A CN 200710022785A CN 101314191 B CN101314191 B CN 101314191B
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- elastic portion
- bracing
- strutting arrangement
- operating parts
- pedestal
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Abstract
The invention relates to a power tool. The power tool comprises a pedestal (1), a supporting device (2) movably connected with the pedestal (1), a work head (3) arranged on the supporting device (2), first elastic parts (5, 51) arranged between the pedestal (1) and the supporting device (2), an operation part (4) movably connected to the pedestal (1) and second elastic parts (6, 61) arranged between the operation part (4) and the supporting device (2). The structure of the power tool determines that the machining resistance of a workpiece (10) to the work head (3) has no direct relation with a pressure (F) applied to the operation part (4) by a user; therefore, in the process of machining the workpiece (10), no matter how large the pressure (F) applied to the operation part (4) is , the power tool can not cause the occurrence of phenomena that a motor (31) is blocked from rotating or burned down; and the power tool with a motor protection device has high reliability, a simple structure and convenient operation and can operate with a working efficiency close to the maximal working efficiency.
Description
Technical field
The present invention relates to a kind of power tool, especially a kind of Profile cut-off machine.
Background technology
In traditional power tool; there is not motor protection device; when user's processing work; if be worked into very hard workpiece; perhaps run into fortuitous event, cut to harder materials such as stone, steel, the user processes if continue to press down working head; will increase the load of motor, the phenomenon generation that causes the motor stall or burn.
For the motor that solves power tool because of the overload stall or burn, the person skilled in art has also done various improvement.As Japanese patent application publication No. is the patent application of JP8336722; disclosed a kind of cutting machine that utilizes indicating device to realize motor overload protection, this cutting machine comprises pedestal, be pivotally connected to the saw of pedestal, be pivotally connected to above-mentioned saw handle, be located at the elastic component between above-mentioned handle and the above-mentioned saw and be connected in indicating device on the handle.Its operation principle is: when increasing acts on the power cut workpiece of handle, above-mentioned handle overcomes above-mentioned elastic component and pivots with respect to above-mentioned saw, above-mentioned indicating device rotates with above-mentioned handle, the user can judge the size of load by the indicated position of indicating device, thereby prevents that motor from damaging.But use when having the power tool of this structure; if under some operating habit condition of poor of user; such as wish fly-cutting; usually can push handle energetically; this moment is not if realize the indicating status of indicating device; perhaps damage malfunctioning because of indicating device; and the words that always continue to push handle; above-mentioned elastic component can reach the deformation limit position; become between above-mentioned handle and the above-mentioned saw this moment and be rigidly connected; if continue to push above-mentioned handle energetically, saw moves downward synchronously together with handle, and motor still can stall or burnt like this.Therefore low, the complex structure of the motor protection device reliability of this kind cutting machine, operation are not too convenient, and cost is higher.In addition owing to the maximum load of motor can not reliably be controlled, as user during with big operating pressure cut workpiece, make motor load surpass certain value, the motor power output will constantly descend with the increase of motor load, is easy to make motor to damage because of stall like this.
Summary of the invention
For overcoming the deficiencies in the prior art, the objective of the invention is to, provide a kind of Profile cut-off machine, the motor protection reliability height of this Profile cut-off machine, simple in structure, more convenient operation and with low cost.
Another object of the present invention is to, can make Profile cut-off machine with its maximum efficiency work.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of Profile cut-off machine, comprise pedestal, be movably connected on bracing or strutting arrangement on the pedestal by first pivot, be located at the working head on the bracing or strutting arrangement, be located at first elastic portion between pedestal and the bracing or strutting arrangement, by second pivot be movably connected on the operating parts on the described pedestal and be located at operating parts and bracing or strutting arrangement between second elastic portion, when the user brought pressure to bear on the described operating parts, described bracing or strutting arrangement and described working head can move on described operating parts travel direction with described operating parts.。
Compared with prior art; the invention has the beneficial effects as follows: by second elastic portion is set between operating parts and bracing or strutting arrangement; and described operating parts is movably connected on the described pedestal by described second pivot; the resistance that makes described workpiece affact on the working head is not directly related with the pressure that the user puts on the operating parts; and it is relevant with the state of first elastic portion and second elastic portion and bracing or strutting arrangement and the parameter of working head own such as gravitational moment; therefore work as the user in the processing work process; in any case strengthen the pressure that affacts on the described operating parts; the maximum resistance that workpiece affacts on the working head all can be controlled; the phenomenon that can not cause the motor stall or burn takes place, thereby the protection motor is avoided damaging.This structure makes the protection of motor more reliable, and the Profile cut-off machine structure that has this kind motor protection device simultaneously is simpler, more convenient to operate, and with low cost.
Industry is in common knowledge in addition, because the power output of motor substantially all is used for processing work, and the energy that process unit's material is consumed is identical, so the maximum efficiency of Profile cut-off machine occurs in the moment that the motor peak power output occurs, that is to say when motor is in peak power output Profile cut-off machine fastest.Among the present invention, because the load of working head can be controlled and be no more than predetermined maximum, promptly the maximum load that need bear of Dui Ying motor can not surpass predetermined value yet, the maximum load that can need bear by parameters such as the coefficient of elasticity control motor of adjusting elastic portion is near the corresponding load value of its peak power output, can guarantee like this to tend to use bigger operating pressure to add man-hour, can make Profile cut-off machine with operating efficiency work near maximum as the user.
Description of drawings
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the main apparent direction schematic perspective view of first embodiment of the invention Profile cut-off machine.
Fig. 2 is the left apparent direction schematic perspective view of first embodiment of the invention Profile cut-off machine.
Fig. 3 be cutting machine under dormant state, the stressed schematic diagram of working head.
Fig. 4 is when saw blade cuts to workpiece in the operation Profile cut-off machine process, the stressed schematic diagram of working head.
Fig. 5 is that cut workpiece speed is slower, and when constantly increasing sharply the operating parts downforce, the view that operating parts and locating part connect.
Fig. 6 is motor load and motor output power curve figure.
Fig. 7 is the amplification schematic perspective view that second embodiment of the invention first elastic portion and second elastic portion are connected in one.
Wherein
1. pedestal 2. bracing or strutting arrangements 3. working heads
31. motor 32. saw blades 4. operating parts
5 (51) first elastic portion, 6 (61) second elastic portion, 7. first pivots
8. second pivot, 9. locating parts, 10. workpiece
20. connecting portion F. user pressure T
5(T
5') moment of torsion
T
6(T
6') torque T
7. moment of torsion G. gravity
F
1(F
2) cutting resistance T (T0) motor load
W (Wmax) motor power output
The specific embodiment
As depicted in figs. 1 and 2, in first kind of embodiment, described power tool is a Profile cut-off machine, this cutting machine comprises the pedestal 1 that is used for supporting workpiece, be pivotally connected to bracing or strutting arrangement 2 on the pedestal 1 by first pivot 7, be located at the working head 3 on the bracing or strutting arrangement 2, be located at first elastic portion 5 between pedestal 1 and the bracing or strutting arrangement 2, by second pivot 8 be pivotally connected to the operating parts 4 on the described pedestal 1 and be located at operating parts 4 and bracing or strutting arrangement 2 between second elastic portion 6, wherein working head 3 comprises saw blade 32 and drives the motor 31 of saw blade 32 rotations, and saw blade 32 is pivotally connected to bracing or strutting arrangement 2 and is used for cut workpiece.In this embodiment, first elastic portion 5 is a torsion spring, and is supported by first pivot 7, and second elastic portion 6 is a torsion spring, and is supported by second pivot 8, and first elastic portion 5 is to separate setting with second elastic portion 6.Certainly well-knownly be, first elastic portion 5 among the present invention also can adopt stage clip, air spring, rubber spring etc. to have certain flexible elastic-like portion, second elastic portion 6 also can adopt stage clip, air spring, rubber spring etc. to have certain flexible elastic-like portion, power also can adopt the power source of other classification except that adopting motor in addition.Wherein in this embodiment, first pivot 7 and second pivot 8 are same axises, in the following describes first pivot 7 and 8 unifications of second pivot are called first pivot 7, in this embodiment, first pivot 7 is fixedlyed connected with bracing or strutting arrangement 2, and first pivot 7 flexibly connects with pedestal 1.The operating parts 4 and first pivot 7 flexibly connect in addition.Certainly, first pivot 7 and second pivot 8 among the present invention also can be set to two axles, and different axis arranged, or are set to two axles, and coaxial line is arranged.Well-knownly in addition be also to be provided with the industry groove (not shown) that connects with saw blade 32 in common knowledge on the pedestal 1.
Cutting machine of the present invention comprises that also industry is in common knowledge under dormant state, the back stopping means (not shown) that restriction bracing or strutting arrangement 2 rotates backward, therefore under dormant state, and under the prerequisite of ignoring the friction of pivotally connected place, as shown in Figure 3, the torque T that bracing or strutting arrangement 2 and working head 3, the first elastic portion 5 are produced
5, the torque T that produced of second elastic portion 6
6With the back torque T that produced of stopping means
7And the moment of torsion that causes of the gravity G of bracing or strutting arrangement 2 and working head 3 itself is formed the torque system of a balance.When work, the user applies power on operating parts 4, drives operating parts 4 and rotates, and the athletic meeting of operating parts 4 increases the compress variation of second elastic portion 6, correspondingly can increase the torque T of second elastic portion 6
6, finally cause the destruction of bracing or strutting arrangement 2 and working head 3 poised states, and order about bracing or strutting arrangement 2 and working head 3 moves on operating parts 4 direction of motion; In this motion process of bracing or strutting arrangement 2 and working head 3, first elastic portion 5 can be by corresponding compression, its corresponding torque T
5Increase, and the corresponding reduction of the compression degree of second elastic portion 6 along with the motion of bracing or strutting arrangement 2, its corresponding torque T
6Reduce, last bracing or strutting arrangement 2 and working head 3 can reach a new balance again.
Similar aforesaid process, as shown in Figure 4, the user constantly exerts pressure F on operating parts 4, and bracing or strutting arrangement 2 and working head 3 can constantly move on operating parts 4 travel directions with operating parts 4; If in said process, the saw blade 32 of working head 3 runs into the obstruction of workpiece 10, just it is produced a cutting pressure, under this effect, and working head 3 beginning cutting process.According to the characteristic of active force and reaction force, the saw blade 32 of working head 3 also is subjected to the cutting resistance F from workpiece 10
1, its size equates that with above-mentioned cutting pressure direction is opposite with it, cutting resistance F
1Effect be to hinder bracing or strutting arrangement 2 and working head 3 continues to rotate; Simultaneously, cutting process can produce cutting resistance F to saw blade 32
2, its effect is to hinder the rotation of saw blade 32.For selected saw blade 32 and workpiece material, cutting resistance F
2With cutting resistance F
1Be to exist to determine a relation, that is, and F
2Be F
1A function.
When cut workpiece 10, as shown in Figure 4, under the prerequisite of ignoring the friction of pivotally connected place, for bracing or strutting arrangement 2 and working head 3, the cutting resistance F that working head 3 is suffered
1With cutting resistance F
2The formed moment of resistance, first elastic portion 5 act on the torque T on the bracing or strutting arrangement 2
5', second elastic portion 6 acts on the torque T on the bracing or strutting arrangement 2
6' and the gravitational moment of the gravity G of bracing or strutting arrangement 2 and working head 3 itself form a new counter balance torque system.Similarly, all be in the elastic working scope as long as guarantee first elastic portion 5 and second elastic portion 6, even second elastic portion 6 constantly changes its torque T along with operating parts 4 change in location so
6', always have cutting resistance F
1And cutting resistance F
2The formed moment of resistance, torque T
5' reach new balance with the gravitational moment of the gravity G of bracing or strutting arrangement 2 and working head 3, and satisfy the elementary function relation of a definite transient state between them.
Above-mentioned definite elementary function relation means, for the torque T of each second possible elastic portion 6
6', always can corresponding cutting resistance F
1And cutting resistance F
2If the torque range that second elastic portion 6 is produced can be determined, so, cut resistance F
1And cutting resistance F
2Scope also correspondingly can be determined.
All guarantee in all elastic portion under the prerequisite of elastic working scope, the theoretical most compressed state of second elastic portion 6 appears at the rotational limitation place of operating parts 4, that is to say that second elastic portion 6 can be in elastic state always before operating parts 4 arrives its rotational limitation; Because always there is a rotational limitation in operating parts 4, promptly the theoretical most compressed state of second elastic portion 6 always can correspondingly be determined; Simultaneously, because for each selected elastic portion, its coefficient of elasticity determines, according to the elastic force that elastic portion produced or the formula of torsion, the possible peak torque of second elastic portion 6 can be estimated.
According to foregoing, can control the cutting resistance F of corresponding second elastic portion, 6 peak torques by the relevant parameters such as coefficient of elasticity that preestablish first elastic portion 5 and second elastic portion 6
1And cutting resistance F
2Within the acceptable range; " tolerance interval " described herein refers at this cutting resistance F
1And cutting resistance F
2Down, the phenomenon generation that can not cause motor 31 stalls or burn.After the relevant parameters such as coefficient of elasticity of first elastic portion 5 and second elastic portion 6 are set according to this, can determine that under any condition of work motor 31 all can not occur because cutting resistance F
1And cutting resistance F
2Excessive and stall or the problem of burning.In sum, cutting resistance F
1And cutting resistance F
2Not directly related with the pressure F that the user puts on the operating parts 4, and it is relevant with the gravitational moment of the gravity G of the state of first elastic portion 5 and second elastic portion 6 and bracing or strutting arrangement 2 and working head 3, in any case therefore strengthen the pressure F that puts on the operating parts 4, the phenomenon generation that can not cause motor 31 stalls or burn.
Among the present invention, as shown in Figure 1 and Figure 4, the locating part 9 that can connect with operating parts 4 also can be set on pedestal 1, when working head 3 normal cut workpiece, and when not running into excessive load, if user's pressing operation spare 4, operating parts 4 can move down under the user applies the effect of power, according to the above, by also corresponding the moving down of bracing or strutting arrangement 2 that second elastic portion 6 and operating parts 4 link together, when bracing or strutting arrangement 2 moved to predetermined angular, bracing or strutting arrangement 2 can connect with the lower limit (not shown) known to the industry, restriction bracing or strutting arrangement 2 continues to move down, thus the depth of cut of control working head 3.As shown in Figure 5, when user's pressing operation spare 4 cut workpiece 10 ran into excessive obstruction, operating parts 4 can continue to move down under the user applies the effect of power, and when operating parts 4 moved to the precalculated position, operating parts 4 can connect with locating part 9.When operating parts 4 and locating part 9 connect; if the user continues to press down operating parts 4, because the obstruction of locating part 9, excessive load can be unloaded on the pedestal 1 by locating part 9; thereby the phenomenon that can not cause motor 31 stalls or burn takes place, and has protected motor 31 to avoid damaging.In the whole operation process of operating parts 4 before connecting with locating part 9, first elastic portion 5 and second elastic portion 6 all are in the elastic working scope in addition, according to above said content, can guarantee operating parts 4 like this before connecting with locating part 9, can be cutting resistance F
1And cutting resistance F
2Control within the acceptable range the phenomenon generation that promptly can not cause motor 31 stalls or burn.This structure makes the present invention more reliable.
According to foregoing, the cutting resistance of working head 3 can be controlled and be no more than predetermined maximum, and promptly the maximum load that need bear of Dui Ying motor 31 can not surpass predetermined value yet.Industry is in common knowledge in addition, because the power output of motor 31 substantially all is used for cutting, and the cutting energy that unit materials consumed is identical, so the maximum efficiency of power tool occurs in the moment that motor 31 peak power outputs occur, that is to say that when motor 31 was in peak power output, the cutting speed of power tool was the fastest.With reference to as shown in Figure 6 motor load T and the curve map of motor power output W, the maximum load that can need bear by parameters such as the coefficient of elasticity control motor 31 of adjusting elastic portion is just near the corresponding load value T0 of its peak power output Wmax, can guarantee like this when the user tends to use bigger operating pressure to cut, can make power tool with operating efficiency work near maximum.The maximum load that said motor 31 need be born is operating parts 4 and the preceding critical moment of locating part 9 touchings, the load that motor 31 is born.
As shown in Figure 7, second kind of embodiment of the present invention, the difference of present embodiment and first kind of embodiment is, first elastic portion 51 and second elastic portion 61 connect as one by connecting portion 20, other structure is all identical with first embodiment with operation principle, gives unnecessary details no longer one by one at this.
The above embodiments only are the most preferred embodiments that provides in order to allow those skilled in the art understand the present invention.The present invention is not limited in above-mentioned specific embodiment.Any those skilled in the art easily full of beard and improvement all within inventive concept of the present invention.
Claims (10)
1. Profile cut-off machine comprises:
A) pedestal (1),
B) bracing or strutting arrangement (2), described bracing or strutting arrangement (2) is movably connected on the described pedestal (1) by first pivot (7),
C) working head (3), described working head (3) are located on the described bracing or strutting arrangement (2),
D) first elastic portion (5,51), described first elastic portion (5,51) are located between described pedestal (1) and the described bracing or strutting arrangement (2),
It is characterized in that: also comprise by second pivot (8) being movably connected on operating parts (4) on the described pedestal (1), and between described operating parts (4) and described bracing or strutting arrangement (2), be provided with second elastic portion (6,61), when the user brought pressure to bear on the described operating parts (4), described bracing or strutting arrangement (2) and described working head (3) can move on described operating parts (4) travel direction with described operating parts (4).
2. Profile cut-off machine according to claim 1 is characterized in that: described first elastic portion (5,51) is connected in one with described second elastic portion (6,61).
3. Profile cut-off machine according to claim 1 is characterized in that: described first elastic portion (5,51) is to separate to be provided with described second elastic portion (6,61).
4. according to claim 2 or 3 described Profile cut-off machines, it is characterized in that: described first pivot (7) and the coaxial setting of described second pivot (8), or same axis.
5. Profile cut-off machine according to claim 4, it is characterized in that: also comprise the locating part of being located on the described pedestal (1) (9), when described operating parts (4) overcomes described second elastic portion (6,61), connect when moving to the precalculated position with respect to described bracing or strutting arrangement (2) with described locating part (9).
6. Profile cut-off machine according to claim 5 is characterized in that: described bracing or strutting arrangement (2) is fixedlyed connected with described first pivot (7), and described first pivot (7) flexibly connects with described pedestal (1).
7. Profile cut-off machine according to claim 1 is characterized in that: described first elastic portion (5,51) is a torsion spring.
8. Profile cut-off machine according to claim 1 is characterized in that: described first elastic portion (5,51) is a stage clip.
9. according to claim 7 or 8 described Profile cut-off machines, it is characterized in that: described second elastic portion (6,61) is a torsion spring.
10. according to claim 7 or 8 described Profile cut-off machines, it is characterized in that: described second elastic portion (6,61) is a stage clip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100227852A CN101314191B (en) | 2007-05-29 | 2007-05-29 | Dynamic tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100227852A CN101314191B (en) | 2007-05-29 | 2007-05-29 | Dynamic tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101314191A CN101314191A (en) | 2008-12-03 |
| CN101314191B true CN101314191B (en) | 2011-12-07 |
Family
ID=40105423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100227852A Expired - Fee Related CN101314191B (en) | 2007-05-29 | 2007-05-29 | Dynamic tools |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101314191B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759690A (en) * | 2014-01-02 | 2015-07-08 | 力山工业股份有限公司 | Cutter having load prompt unit |
| CN105479528A (en) * | 2015-11-30 | 2016-04-13 | 苏州市汇峰机械设备有限公司 | Handle for cutting machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2301306Y (en) * | 1997-07-29 | 1998-12-23 | 荣成市电动工具厂 | Three-phase sections cutter |
| CN2357867Y (en) * | 1998-04-27 | 2000-01-12 | 昆明伟实机械设备有限公司 | Multifunctional cutting machine |
| CN201036821Y (en) * | 2007-05-30 | 2008-03-19 | 苏州宝时得电动工具有限公司 | Power tool |
-
2007
- 2007-05-29 CN CN2007100227852A patent/CN101314191B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2301306Y (en) * | 1997-07-29 | 1998-12-23 | 荣成市电动工具厂 | Three-phase sections cutter |
| CN2357867Y (en) * | 1998-04-27 | 2000-01-12 | 昆明伟实机械设备有限公司 | Multifunctional cutting machine |
| CN201036821Y (en) * | 2007-05-30 | 2008-03-19 | 苏州宝时得电动工具有限公司 | Power tool |
Non-Patent Citations (1)
| Title |
|---|
| JP平8-336722A 1996.12.24 |
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| Publication number | Publication date |
|---|---|
| CN101314191A (en) | 2008-12-03 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20160529 |