CN209903131U

CN209903131U - Intermittent rotating mechanism for electric tool

Info

Publication number: CN209903131U
Application number: CN201920695499.0U
Authority: CN
Inventors: 王亮; 郑华平
Original assignee: Zhejiang Liangye Tools Co ltd
Current assignee: Zhejiang Liangye Group Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-01-07
Anticipated expiration: 2029-05-15

Abstract

The utility model relates to an intermittent rotation mechanism for electric tool, including the driving link, the uide bushing and locate the intraoral working head of front end of uide bushing, the rotation process of working head carries out spacing cooperation through setting up deflection guide way and axial guide way on the working head and the spacing post on the uide bushing and realizes, wherein, when the working head backward movement under the drive action of driving link, under the mating action of spacing post and deflection guide way, especially when spacing post slips into the deflection section from straight section, the working head can take place the spin motion automatically, the working head is in the rotation process, the spacing post can follow the deflection section of this deflection guide way and slip into adjacent next axial guide way, accomplish the spin motion. The electric tool using the intermittent rotation mechanism does not need to be additionally provided with a motor and a corresponding transmission mechanism for driving the electric tool to rotate in the prior art, so that the electric tool is smaller in size, the internal structure is effectively simplified, and the production cost is reduced.

Description

Intermittent rotating mechanism for electric tool

Technical Field

The utility model relates to an electric tool technical field especially relates to an intermittent type rotary mechanism for electric tool.

Background

In a conventional electric impact tool, a driving mechanism drives a working head to impact an object to be cut back and forth, so as to form a predetermined size of a hole. Here, the impact mechanism of the electric impact tool can repeatedly drive the working head in a rotating and impacting manner, such as a chisel, in order to generate corresponding rotating and impacting actions, the eccentric component (or crank-slider mechanism) or the piston driven by high-pressure gas is driven by the motor to generate reciprocating motion, and the reciprocating motion is combined with the rotating motion driven by the motor to form a rotating and impacting composite motion, wherein the impacting motion of the working head crushes the surface of an excavation object, and the rotating motion brings out the excavated debris, such as chinese patent application No. CN201510315089.5 (publication No. CN104985567B) discloses a novel composite impact drill. However, the rotation of the conventional impact power tool is generated by an additional motor and a corresponding transmission mechanism, so that the structure of the power tool with the impact and rotation functions is complex, the size is large, and the production cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the current situation to prior art provides an intermittent type rotary mechanism for electric tool, adopts this intermittent type rotary mechanism for electric tool can needn't additionally set up motor and corresponding drive mechanism and make electric tool's working head realize rotation function.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: the intermittent rotating mechanism for the electric tool comprises a driving link rod, a guide sleeve and a working head which is rotatably arranged in a front port of the guide sleeve around the axis of the driving link rod, the driving link rod penetrates through the guide sleeve to be in driving connection with the working head so that the working head can reciprocate back and forth relative to the guide sleeve, a plurality of deflection guide grooves are sequentially arranged on the outer circumference of an inserting section of the working head in the front port of the guide sleeve at intervals along the circumferential direction of the working head, each deflection guide groove comprises a straight section which is consistent with the axial direction of the working head and a deflection section which deflects from the straight section to one side, and the deflection directions of the deflection sections of the deflection guide grooves are consistent; the outer circumference of the inserting section is also provided with a plurality of axial guide grooves which are in one-to-one correspondence with the deflection guide grooves, each axial guide groove is communicated with the straight section of the corresponding deflection guide groove and is positioned on the same straight line, and the bottom surfaces of the axial guide grooves are higher than the bottom surfaces of the straight sections of the deflection guide grooves so as to form a first step part; the deflection section of the deflection guide groove is communicated to the axial guide groove corresponding to the adjacent deflection guide groove, and the bottom surface of the deflection section of the deflection guide groove is higher than the bottom surface of the axial guide groove so as to form a second step part; the inner wall of the guide sleeve is also provided with a limiting column, the end part of the limiting column is exposed out of the inner wall surface of the guide sleeve and is clamped in the axial guide groove and the deflection guide groove, and the limiting column can sequentially slide into the straight section of the corresponding deflection guide groove from the axial guide groove and slide into the next adjacent axial guide groove from the straight section along the deflection section in the process that the working head reciprocates back and forth relative to the guide sleeve.

In order to enable the working head to flexibly rotate relative to the driving connecting rod in the process that the driving connecting rod drives the working head to reciprocate back and forth, the middle part of the inserting section of the working head is provided with a mounting hole for inserting the front end of the driving connecting rod along the axial direction of the middle part; the outer peripheral wall of the front end of the driving link rod is provided with an annular groove, and the working head is provided with a limiting pin shaft which can be clamped into the annular groove in a penetrating mode. The annular groove arranged on the driving link rod is matched with the limiting pin shaft on the working head, so that the driving link rod and the working head can be locked in the axial direction, the separation of the driving link rod and the working head is avoided, and the reciprocating movement of the working head back and forth is further realized; on the other hand, the arrangement of the annular groove ensures that the driving link rod and the working head are locked in the axial direction, and simultaneously, the limiting pin shaft can rotate relative to the driving link rod in the annular groove along the circumferential direction of the limiting pin shaft.

In order to more firmly lock the working head and the driving link rod in the axial direction through the limiting pin shaft, a first assembly hole for the limiting pin shaft to be inserted from the outside is formed in the working head, when the limiting pin shaft is assembled on the working head, two end parts of the limiting pin shaft are limited in the first assembly hole of the working head, and the middle part of the limiting pin shaft is clamped into the annular groove.

In order to accurately guide the working head in the front-rear direction, a guide ring used for being sleeved on the working head is arranged at the front port of the guide sleeve, and a guide cylinder matched with an inner hole of the guide sleeve is arranged at the rear end of the driving link rod.

In order to guide the driving link rod more stably and avoid the driving link rod from rotating along with the working head along with the driving link rod, the rear end of the guide sleeve is further provided with two extension arms which extend backwards along the axial direction and are symmetrically arranged, the two extension arms are respectively provided with a strip-shaped hole groove which is consistent with the axial direction of the guide sleeve, the end wall of the guide cylinder of the driving link rod is provided with two fixed support arms which extend backwards along the axial direction, the two fixed support arms respectively correspond to the two extension arms at the inner side and the outer side, a driving shaft is arranged between the two fixed support arms in a penetrating mode, and the two ends of the driving shaft penetrate through the fixed support arms and are limited in the strip-shaped hole grooves of the.

In order to enable the forward and backward action process of the driving link rod in the guide sleeve to be more stable, a first blocking shoulder part is further arranged on the inner wall of the guide sleeve, and a first elastic part is arranged between the end wall of the guide cylinder of the driving link rod and the first blocking shoulder part.

In order to conveniently assemble the guide ring on the guide sleeve, a placement hole for placing the guide ring is formed in the front port of the guide sleeve, the placement hole is located on the outer side of the inner hole of the guide sleeve and is coaxially arranged with the inner hole of the guide sleeve, the diameter of the placement hole is larger than that of the inner hole of the guide sleeve so as to form a second stop shoulder, a wave spring is arranged between the guide ring and the stop shoulder, and a clamp spring used for limiting the guide ring in the placement hole is further arranged at the front port of the guide sleeve. Due to the arrangement of the wave spring, a buffer effect can be formed between the guide ring and the guide sleeve, the guide ring is prevented from possibly driving the guide ring to form direct impact on the guide sleeve when the working head is reset backwards, the vibration condition of the electric tool is reduced, and the two parts are prevented from being abraded or damaged due to direct collision.

In order to enable the end part of the limiting column to be separated from the inner wall of the exposed guide sleeve, the end part of the limiting column is automatically clamped into the axial guide groove and the deflection guide groove of the working head, a second assembly hole used for assembling the limiting column is formed in the inner wall of the guide sleeve, and a second elastic piece supported against the inner end of the limiting column is arranged in the second assembly hole. The structure is convenient to process, low in production cost and convenient to assemble, and the limit column can be guaranteed to be rapidly and sensitively clamped into the corresponding axial guide groove and the corresponding deflection guide groove.

Compared with the prior art, the utility model has the advantages that: the utility model discloses a rotatory process of working head is through setting up deflection guide way and axial guide way on the working head and the spacing post on the uide bushing carry out spacing cooperation and realize, wherein, when the working head moves forward under the drive action of drive link rod, the spacing post can slide into the straight section of deflection guide way from the axial guide way, the working head can not deflect at this moment, accomplish forward impact action, and when the working head moves backward under the drive action of drive link rod, under the cooperation of spacing post and deflection guide way, especially when the spacing post slides into the deflection section from straight section, because the spacing post locates on the uide bushing and does not move, so the working head can take place the rotation action automatically, the working head is in rotatory process, the spacing post can slide into adjacent next axial guide way from the deflection section of this deflection guide way, and sequentially and circularly finishing the impact action and the rotation action. The intermittent rotating mechanism for the electric tool does not need to be additionally provided with a motor and a corresponding transmission mechanism for driving the work rotation as in the prior art, the working head of the intermittent rotating mechanism can complete non-rotating impact action in the advancing process, and can automatically realize rotating action in the retreating and resetting process.

Drawings

Fig. 1 is a schematic perspective view of an intermittent rotation mechanism for an electric tool according to an embodiment of the present invention;

fig. 2 is a sectional view of an intermittent rotation mechanism for an electric power tool according to an embodiment of the present invention;

fig. 3 is an exploded view of an intermittent rotation mechanism for a power tool according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a working head of an intermittent rotation mechanism for an electric tool according to an embodiment of the present invention;

fig. 5 is a sectional view of a working head of an intermittent rotation mechanism for an electric tool according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of the working head of the intermittent rotation mechanism for the electric power tool according to the embodiment of the present invention at another angle;

fig. 7 is a sectional view of a guide sleeve of an intermittent rotary mechanism for an electric power tool according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Referring to fig. 1 to 7, the intermittent rotation mechanism for the electric tool includes a driving link 10, a guide sleeve 20, and a working head 30 provided in a front port of the guide sleeve 20, wherein, the driving link rod 10 passes through the guide sleeve 20 to drive and connect the working head 30, so that the working head 30 can movably reciprocate back and forth relative to the guide sleeve 20, the working head 30 can also rotate around the axis thereof relative to the guide sleeve 20, specifically, a section of the working head 30 located in the front port of the guide sleeve 20 is defined as an inserting section 31, a plurality of deflecting guide grooves 40 are sequentially arranged on the outer circumference of the inserting section 31 at intervals along the circumferential direction thereof, wherein, each deflecting guide groove 40 gradually extends from back to front and comprises a straight section 41 consistent with the axial direction of the working head 30 and a deflecting section 42 deflected from the straight section 41 to one side, and the deflecting direction of the deflecting section 42 of each deflecting guide groove 40 is consistent. In addition, a plurality of axial guide grooves 50 corresponding to the deflection guide grooves 40 one by one are further formed on the outer circumference of the inserting section 31, each axial guide groove 50 communicates with the straight section 41 of the corresponding deflection guide groove 40 and is positioned on the same straight line, the bottom surface of the axial guide groove 50 is higher than the bottom surface of the straight section 41 of the deflection guide groove 40 to form a first step portion 43, the deflection section 42 of the deflection guide groove 40 communicates with the axial guide groove 50 corresponding to the adjacent deflection guide groove 40, and the bottom surface of the deflection section 42 of the deflection guide groove 40 is higher than the bottom surface of the axial guide groove 50 to form a second step portion 51, which is described in detail in fig. 4 to 6. In the present embodiment, the inner wall of the guide sleeve 20 is further provided with a stopper post 60 whose end portion is exposed from the inner wall surface of the guide sleeve 20 and is fitted into the axial guide groove 50 and the deflection guide groove 40. In this embodiment, by providing the first step portion 43 and the second step portion 51, the working head 30 can only slide into the straight section 41 of the deflecting guide groove 40 from the axial guide groove 50 during the forward process, and can only slide into the next adjacent axial guide groove 50 along the track of the deflecting guide groove 40 during the backward process, but cannot slide into the axial guide groove 50 from the straight section 41 of the deflecting guide groove 40, or slide into the deflecting section 42 of the upward deflecting guide groove 40 from the axial guide groove 50, which ensures that the working head 30 can sequentially complete the impacting and rotating processes during the forward and backward reciprocating processes.

The rotation process of the working head 30 in this embodiment is realized by the limit engagement of the deflection guide slot 40 and the axial guide slot 50 provided on the working head 30 with the limit post 60 on the guide sleeve 20, wherein when the working head 30 moves forward under the driving action of the driving link 10, the limit post 60 can slide into the straight section 41 of the deflection guide slot 40 from the axial guide slot 50, at this time, the working head 30 will not deflect, and the forward impact action is completed, and when the working head 30 moves backward under the driving action of the driving link 10, under the engagement action of the limit post 60 and the deflection guide slot 40, especially when the limit post 60 slides into the deflection section 42 from the straight section 41, the working head 30 can automatically rotate because the limit post 60 is arranged on the guide sleeve 20 and does not move, during the rotation process of the working head 30, the limit post 60 can slide into the next adjacent axial guide slot 50 from the deflection section 42 of the deflection guide slot 40, and sequentially and circularly finishing the impact action and the rotation action. The intermittent rotation mechanism for the electric tool does not need to be additionally provided with a motor and a corresponding transmission mechanism for driving the work rotation as in the prior art, the working head 30 can complete non-rotation impact action in the advancing process, and can automatically realize rotation action in the retreating and resetting process.

Referring to fig. 2, since the deflecting guide groove 40 and the axial guide groove 50 have different groove hole depths, in order to enable the end of the position-limiting post 60 to automatically expose the inner wall of the guide sleeve 20 and quickly snap into the axial guide groove 50 and the deflecting guide groove 40 of the working head 30, a second assembly hole 25 for assembling the position-limiting post 60 is formed on the inner wall of the guide sleeve 20, a second elastic member 83 which abuts against the inner end of the position-limiting post 60 is arranged in the second assembly hole 25, and in this embodiment, the second elastic member 83 is a telescopic spring. Due to the structural arrangement, the processing is convenient, the production cost is reduced, the assembly is easy, and the limit column 60 can be rapidly and sensitively clamped into the corresponding axial guide groove 50 and the deflection guide groove 40.

In the conventional electric impact tool, one end of the driving link rod 10 is drivingly connected to the working head 30, and the other end is fixedly connected to the power device (generally, a motor) generally through an eccentric assembly (or a crank-slider mechanism), so that the driving link rod 10 generally does not rotate, in the present embodiment, referring to fig. 2 and 3, in order to enable the working head 30 to flexibly rotate relative to the driving link rod 10 during the forward and backward reciprocating motion of the driving link rod 10 with the working head 30, the middle portion of the insertion section 31 of the working head 30 is provided with a mounting hole 310 along the axial direction thereof for inserting the end portion of the driving link rod 10, the outer peripheral wall of the front end of the driving link rod 10 is provided with an annular groove 11, the working head 30 is provided with a limit pin 32 capable of being clamped into the annular groove 11, and specifically, in order to more firmly lock the working head 30 and the driving link rod 10 in the axial direction through the limit pin 32, the working head 30 is provided with a first assembling hole 33 for inserting the limiting pin shaft 32 from the outside, when the limiting pin shaft 32 is assembled on the working head 30, the two end parts of the limiting pin shaft 32 are both limited in the first assembling hole 33 of the working head 30, and the middle part of the limiting pin shaft 32 is clamped in the annular groove 11. In the embodiment, the annular groove 11 formed in the driving link rod 10 is matched with the limit pin shaft 32 on the working head 30, so that the driving link rod 10 and the working head 30 can be locked in the axial direction, the separation of the driving link rod and the working head 30 is avoided, and the front and back reciprocating movement of the working head 30 is further realized; on the other hand, the annular groove 11 is provided to ensure that the driving link 10 and the working head 30 are axially locked, and the limit pin 32 can rotate in the annular groove 11 along the circumferential direction thereof relative to the driving link 10.

Referring to fig. 3 and 7, in order to accurately guide the working head 30 in the front-rear direction and avoid the working head 30 from shaking during the front-rear reciprocating motion, a guide ring 70 for being sleeved on the working head 30 is disposed at the front port of the guide sleeve 20, the rear end of the driving link rod 10 is provided with a guide cylinder 12 adapted to an inner hole of the guide sleeve 20, specifically, the rear end of the guide sleeve 20 in this embodiment is further provided with two extending arms 21 extending axially and rearwardly and symmetrically, each of the two extending arms 21 is provided with a strip-shaped hole groove 210 in accordance with the axial direction of the guide sleeve 20, the end wall of the guide cylinder 12 of the driving link rod 10 is provided with two fixing arms 13 extending axially and rearwardly, the two fixing arms 13 respectively correspond to the two extending arms 21 on the inner and outer sides, a driving shaft 14 penetrates between the two fixing arms 13, both ends of the driving shaft 14 penetrate through the fixing arms 13 and are limited in the strip-shaped hole grooves 210 of the corresponding extending arms 21, the driving shaft 14 can be connected to each other through a crank-slider mechanism between the driving motors to perform a reciprocating motion of the driving link 10 in a forward and backward direction, and the arrangement of the strip-shaped hole 210 can guide the driving link 10 in the forward and backward direction more stably and prevent the driving link 10 from rotating with the working head 30 along with the driving link 10.

Referring to fig. 2 and 3, in order to make the forward and backward movement of the driving link 10 in the guide sleeve 20 more stable, a first stopping shoulder 22 is further provided on the inner wall of the guide sleeve 20, and a first elastic member 80 is provided between the end wall of the guide cylinder 12 of the driving link 10 and the first stopping shoulder 22, in this embodiment, the first elastic member 80 is a spring. Referring to fig. 7, in order to conveniently assemble the guide ring 70 on the guide sleeve 20, the front port of the guide sleeve 20 has a seating hole 23 for seating the guide ring 70, the seating hole 23 is located outside and coaxially with the inner hole of the guide sleeve 20, the seating hole 23 has a diameter larger than that of the inner hole of the guide sleeve 20 to form a second seating shoulder 24, a wave spring 81 is disposed between the guide ring 70 and the seating shoulder, and a snap spring 82 for restraining the guide ring 70 in the seating hole 23 is further disposed at the front port of the guide sleeve 20, wherein the snap spring 82 is snapped on the inner wall of the front port of the guide sleeve 20. In this embodiment, the wave spring 81 is arranged to form a buffering effect between the guide ring 70 and the guide sleeve 20, so as to prevent the guide ring 70 from driving the guide ring 70 to directly impact the guide sleeve 20 when the working head 30 is returned backward, reduce the vibration of the electric tool, and prevent the two components from being worn or damaged due to direct collision.

Claims

1. The intermittent rotation mechanism for the electric tool comprises a driving link rod (10), a guide sleeve (20) and a working head (30) which can be rotatably arranged in the front end opening of the guide sleeve (20) around the axis of the driving link rod (10), wherein the driving link rod (10) penetrates through the guide sleeve (20) to be in driving connection with the working head (30) so that the working head (30) can reciprocate back and forth relative to the guide sleeve (20), and the intermittent rotation mechanism is characterized in that: the outer circumference of an inserting section (31) of the working head (30) positioned in the front port of the guide sleeve (20) is sequentially provided with a plurality of deflection guide grooves (40) at intervals along the circumferential direction, each deflection guide groove (40) comprises a straight section (41) which is consistent with the axial direction of the working head (30) and a deflection section (42) which deflects to one side from the straight section (41), and the deflection directions of the deflection sections (42) of the deflection guide grooves (40) are consistent;

the outer circumference of the inserting section (31) is also provided with a plurality of axial guide grooves (50) which are in one-to-one correspondence with the deflection guide grooves (40), each axial guide groove (50) is communicated with the straight section (41) of the corresponding deflection guide groove (40) and is positioned on the same straight line, and the bottom surface of each axial guide groove (50) is higher than the bottom surface of the straight section (41) of the corresponding deflection guide groove (40) so as to form a first step part (43);

the deflection section (42) of the deflection guide groove (40) is communicated to the axial guide groove (50) corresponding to the adjacent deflection guide groove (40), and the bottom surface of the deflection section (42) of the deflection guide groove (40) is higher than that of the axial guide groove (50) so as to form a second step part (51);

the inner wall of the guide sleeve (20) is further provided with a limiting column (60) of which the end part can movably expose out of the inner wall surface of the guide sleeve (20) and is clamped in the axial guide groove (50) and the deflection guide groove (40), and in the process that the working head (30) reciprocates back and forth relative to the guide sleeve (20), the limiting column (60) can sequentially slide into the straight section (41) of the corresponding deflection guide groove (40) from the axial guide groove (50) and slide into the next adjacent axial guide groove (50) from the straight section (41) along the deflection section (42).

2. The intermittent rotation mechanism for a power tool according to claim 1, characterized in that: the middle part of the inserting section (31) of the working head (30) is provided with a mounting hole (310) along the axial direction for inserting the front end of the driving link rod (10);

the outer peripheral wall of the front end of the driving link rod (10) is provided with an annular groove (11), and the working head (30) is provided with a limiting pin shaft (32) which can be clamped into the annular groove (11) in a penetrating manner.

3. The intermittent rotation mechanism for a power tool according to claim 2, characterized in that: the working head (30) is provided with a first assembling hole (33) for the limiting pin shaft (32) to be inserted from the outside, when the limiting pin shaft (32) is assembled on the working head (30), two end parts of the limiting pin shaft (32) are limited in the first assembling hole (33) of the working head (30), and the middle part of the limiting pin shaft (32) is clamped in the annular groove (11).

4. The intermittent rotation mechanism for a power tool according to claim 2 or 3, characterized in that: the front end of the guide sleeve (20) is provided with a guide ring (70) which is sleeved on the working head (30), and the rear end of the driving link rod (10) is provided with a guide cylinder (12) matched with the inner hole of the guide sleeve (20).

5. The intermittent rotation mechanism for a power tool according to claim 4, characterized in that: the rear end of uide bushing (20) still has two extension arms (21) that extend backward and the symmetry sets up along the axial, all sets up one on two extension arms (21) with the bar hole groove (210) that the axial of uide bushing (20) is unanimous, have two fixed support arm (13) that extend backward along the axial on the end wall of direction cylinder (12) of drive link rod (10), these two fixed support arm (13) correspond with above-mentioned two extension arms (21) inside and outside both sides respectively, wear to be equipped with a drive shaft (14) between two fixed support arm (13), and the both ends of this drive shaft (14) all pass fixed support arm (13) are injectd in bar hole groove (210) of corresponding extension arm (21).

6. The intermittent rotation mechanism for a power tool according to claim 4, characterized in that: the inner wall of the guide sleeve (20) is also provided with a first stop shoulder part (22), and a first elastic part (80) is arranged between the end wall of the guide cylinder (12) of the driving link rod (10) and the first stop shoulder part (22).

7. The intermittent rotation mechanism for a power tool according to claim 4, characterized in that: the front port of uide bushing (20) has and is used for placing place hole (23) of uide ring (70), this place hole (23) are located the outside of the hole of uide bushing (20) and with the coaxial setting of hole of this uide bushing (20), the diameter of place hole (23) is greater than thereby the diameter of the hole of uide bushing (20) forms a second fender shoulder (24), uide ring (70) with keep off and be equipped with wave spring (81) between the shoulder, the front port department of uide bushing (20) still is equipped with and is used for injecing uide ring (70) jump ring (82) in place hole (23).

8. An intermittent rotation mechanism for a power tool according to any one of claims 1 to 3, characterized in that: and a second assembly hole (25) for assembling the limiting column (60) is formed in the inner wall of the guide sleeve (20), and a second elastic piece (83) which is supported against the inner end of the limiting column (60) is arranged in the second assembly hole (25).