CN201241610Y - Speed limiting mechanism of pneumatic drilling machine - Google Patents
Speed limiting mechanism of pneumatic drilling machine Download PDFInfo
- Publication number
- CN201241610Y CN201241610Y CNU2008200783533U CN200820078353U CN201241610Y CN 201241610 Y CN201241610 Y CN 201241610Y CN U2008200783533 U CNU2008200783533 U CN U2008200783533U CN 200820078353 U CN200820078353 U CN 200820078353U CN 201241610 Y CN201241610 Y CN 201241610Y
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- ball
- drilling machine
- collecting rack
- pneumatic drilling
- main shaft
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Abstract
The utility model discloses a speed limiting mechanism of a pneumatic drilling machine, which comprises a main shaft of the pneumatic drilling machine, wherein a ball bracket is fixed on the main shaft in an air passage of the pneumatic drilling machine, a movable ball mount is arranged on the ball bracket, the opposite sides of the ball bracket and the ball mount are respectively equipped with a groove with taper-faced edges, the two grooves form cavities, two steel balls are symmetrically disposed in the cavities, further, a fixing sleeve is arranged at the upper portion of the ball mount, the lower portion of the inner hole of the fixing sleeve is engaged with the upper portion of the ball mount, the ball mount is sleeved on the main shaft of the pneumatic drilling machine, a spring for prestressing is arranged on the main shaft of the pneumatic drilling machine and above the ball mount, and additionally, an outer air passage of the pneumatic drilling machine is communicated to the upper portion of the fixing sleeve, and is communicated to an inner air passage of the pneumatic drilling machine through a gap between the fixing sleeve and the ball mount. The speed limiting mechanism can limit air intake in conditions of idling and light loading, limit rotary speed of the drilling machine, prolong the service life of the drilling machine, simultaneously, reduce air consumption and save the limited air source under coal mines.
Description
Technical field
The utility model relates to a kind of frame for movement of volitional check pneumatic drilling machine rotating speed.
Background technology
Existing colliery is a lot of with the model of pneumatic drilling machine, and utilization is very extensive.Thereby its principle is directly to blow the main shaft rotation that motor gear drives pneumatic drilling machine when utilizing compressed air by air flue, realizes being installed in the rotation of the drill bit on the main shaft.The structure of present pneumatic drilling machine is the main shaft that is provided with the air motor gear in the cavity of pneumatic drilling machine, end at the cavity of pneumatic drilling machine is provided with end cap, end cap is provided with the air vent that connects pressure-air, this air vent is communicated with the air duct of setting in the pneumatic drilling machine, the air duct that is provided with in the pneumatic drilling machine is aimed at the air motor gear, having air communication fashionable, the air motor gear can be blown, and realizes that main shaft drives the drill bit rotation.But because pneumatic drilling machine is in little load or when non-loaded, pressure-air can feed at a high speed, and air motor gear driven main shaft and drill bit are rotated at a high speed, causes the loss of the bearing of rig inside and motor gear serious, shortened the application life of rig, and serious waste compressed air.
The utility model content
The utility model technical issues that need to address provide a kind of speed limiting mechanism of pneumatic drilling machine; this mechanism can be when limiting that rig rotates at a high speed under zero load, the underloading situation air inflow; thereby reach restriction rig rotating speed; protection internal bearings and motor gear; the purpose that prolongs the application life of rig; simultaneously can also reduce air consumption, save limited gas resource under the coal mine.
For solving the problems of the technologies described above, technical solution adopted in the utility model is:
A kind of pneumatic drilling machine speed limiting mechanism, it is located in the pneumatic drilling machine main body air flue, be connected the end of the main shaft of pneumatic drilling machine, and between the end ring and main-axis end of the main shaft of pneumatic drilling machine, it mainly comprises ball carriage, steel ball, ball-collecting rack, spring, fixed cover.
On the bearing of the main shaft of pneumatic drilling machine, be provided with ring-type ball carriage, on the fixedly connected main shaft of ball carriage, and fix by Sealing shield ring.The ball-collecting rack of one activity is set on the ball carriage, is respectively arranged with the groove that the edge is a taper surface on the corresponding surface of ball carriage and ball-collecting rack, the cross section at two groove composition edges is the cavity of V-type groove, is provided with steel ball in the cavity between ball carriage and the ball-collecting rack.Ball carriage inner edge place has the annular projection of downward extension, is embedded under the annular projection between end ring and the main shaft, withstands on the inner ring of bearing; Outer rim is provided with flange upwards above the ball carriage, and flange inside is outward extending tapered slope; Carriage is provided with steel ball, and steel ball has two or more and is periphery equably in same horizontal plane.
Being located at above the steel ball of ball-collecting rack activity is shaped as the ring-type around main shaft, and the inner edge place has the annular projection of downward extension; The bottom surface of ball-collecting rack is and the corresponding downward outward extending annular slope of the tapered slope of ball carriage, its outward flange extend downward the ball carriage bottom surface, form the edge of working in coordination with the outer rim of ball carriage, the external diameter of the internal diameter of edge and ball carriage is complementary; Distance between the bottom surface of the bottom surface of ball-collecting rack groove and ball carriage groove is corresponding with steel ball size.
The inside of the annular projection that extend downwards ball-collecting rack inner edge bottom is provided with shoulder hole, and shoulder hole is up big and down small axial step cylindrical hole; Be provided with spring base in the shoulder hole, spring base is between main shaft and ball-collecting rack inwall, and the shape of its underpart, size and shoulder hole are suitable, its top is that internal diameter and main shaft diameter are complementary, external diameter is less than the hollow cylindrical of the big bore dia of shoulder hole, and the joint, upper and lower part of spring base is radially a boss; Be set with spring on the top of the radially boss of spring base and main shaft, the spring bottom is positioned on radially the boss, and the length of spring exceeds the top of spring base, and the tip position of spring base is lower than or the position at spring top when being positioned at spring and being in limit compression.Be rotary with nut between main shaft upper spring top and axle head.
On ball-collecting rack, be provided with fixed cover, the shape of the shape of the inner surface of the lower end of fixed cover and the outer surface of upper of ball-collecting rack is complementary, can be the taper surface of working in coordination, be gas passage between the cone-shaped inner surface of ball-collecting rack conical outer surface and fixed cover, air flue on gas passage and the end cap and the air flue in the pneumatic drilling machine body communicate up and down.Forming gas cavity between fixed cover and the end cap, is the part of gas passage.
Ball-collecting rack is provided with the pore that is communicated with gas passage and steel ball space of living in; The back-up ring that the ball carriage is fixed on the main shaft is a Sealing shield ring, and the end ring between ball carriage and bearing also is a Sealing shield ring, and they seal to the gas that enters in the cavity between ball carriage and the ball-collecting rack.Between fixed cover upper surface and end cap soffit, be provided with sealing ring.
Be provided with the clamp of restriction steel ball horizontal circular motion in the cavity between ball-collecting rack and the ball carriage, clamp be provided with radially extend, along the equally distributed draw-in groove of circumference, steel ball places in this draw-in groove.Clamp can be arranged between ball-collecting rack inner edge place's annular projection and edge.
The annular slope of the steel ball outside and ball carriage, the annular slope of ball-collecting rack are tangent.
Owing to adopted technique scheme, the obtained technological progress of the utility model is:
The pneumatic drilling machine speed limiting mechanism of the said structure that the utility model provides when being used on the existing pneumatic drilling machine, can be installed in the existing pneumatic drilling machine main body.The nut that connects with main shaft is given the certain pretightning force of spring, and ball-collecting rack and steel ball are pressed on the ball carriage, and the ball carriage links to each other with main shaft, and main shaft links to each other with motor gear.Impel motor gear and main shaft to rotate together when wind enters air flue, main shaft passes to the ball carriage with rotation; When rotating speed within the specific limits the time, the pretightning force of spring can be fixed on steel ball a certain position, and after rotating speed exceeded preset range, steel ball was under action of centrifugal force, outwards move, give thrust that makes progress of ball-collecting rack, when this thrust is enough to overcome the pretightning force of spring, ball-collecting rack is moved up, thereby reduce the air flue gap between ball-collecting rack and the fixed cover, thereby reduced throughput, and then reduced the rotating speed of motor gear, reached the speed limit purpose.Size by adjusting nut is given initial tension of spring realizes the adjusting to the motor gear rotating speed.
The tapered inclined-plane of ball-collecting rack upper design can make the gap between itself and fixed cover be convenient to regulate, and when ball-collecting rack moved up, the gap between them can dwindle uniformly.
The connection air flue of establishing on the ball-collecting rack and the pore in steel ball space of living in, can make the ball carriage of rotation at a high speed and the cavity between the ball-collecting rack be unlikely to form negative pressure, the setting of the back-up ring above the ball carriage and the setting of end ring, can seal up from air duct and lead to air between ball-collecting rack and the ball carriage, make it be unlikely to a large amount of gap locations and lead to the air motor gear from axle and bearing.The setting of sealing ring can be avoided gas leakage between fixed cover and end cap.
It is tangent to have the design of clamp of draw-in groove and steel ball and V-type inclined-plane, can be spacing more accurately to steel ball, and make its outside moving can react the super predetermined of rotating speed more accurately.
To sum up; the utility model and this mechanism of pneumatic drilling machine of the prior art can be by the air inflows under restriction zero load, the underloading situation; limit the rig rotating speed; protection internal bearings and motor gear; prolong rig application life; simultaneously can also reduce air consumption, save limited gas resource under the coal mine.
Description of drawings
Fig. 1 provides the structural representation of pneumatic drilling machine speed limiting mechanism for the utility model embodiment.
Wherein: arrow is represented the flow direction of pressure-air among the figure; 1, end cap, 2, nut, 3, spring, 4, sealing ring, 5, fixed cover, 6, ball-collecting rack, 7, steel ball, 8, the ball carriage, 9, end ring, 10, bearing, 11, motor gear, 12, main shaft, 13, back-up ring, 14, clamp, 15, pore, 16, air flue.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Figure 1 shows that a kind of pneumatic drilling machine speed limiting mechanism, be located in the air flue of pneumatic drilling machine, in air flue, be provided with the main shaft 12 of the pneumatic drilling machine that links to each other with motor gear 11, be connected with bearing 10 on the main shaft 12, be provided with end ring 9 above the bearing 10.The pneumatic drilling machine speed limiting mechanism is between the end and end cap 1 of main shaft 12, and it comprises ball carriage 8, steel ball 7, ball-collecting rack 6, spring base, spring 3, nut 2 and fixed cover 5.
The ball carriage 8 of ring-type is fixedly mounted on the main shaft 12, and is stuck on the main shaft 12 with back-up ring 13, below the back-up ring 13 and be provided with O-ring seal between the ball carriage 8.The inner edge place of ball carriage 8 has the annular projection of downward extension, is provided with the end ring 9 that can seal between ball carriage 8 and bearing 10, and the annular projection at ball carriage 8 inner edge places withstands on end ring 9 on the inner ring of bearing 10.
Ball-collecting rack 6 is located at steel ball 7 tops, is that the inverted ring cup-shaped that flexibly connects around main shaft 12, the outer rim of ball-collecting rack 6 be the external diameter corresponding annular inclined-plane of annular slope extension downwards, its internal diameter and ball carriage 8; The bottom surface outward flange that the outward flange of ball-collecting rack 6 extends downward ball carriage 8 forms edge, and the external diameter of the internal diameter of edge and ball carriage 8 is complementary.On the corresponding surface of ball carriage 8 and ball-collecting rack 6, the edge is that the groove of taper surface is formed the cavity that the edge is the V-type groove in correspondence with each other, places the V-type face of steel ball in the cavity and cavity edge tangent.
The inner edge place of ball-collecting rack 6 has the annular projection of downward extension, be provided with clamp 14 between the edge of this annular projection and outer rim, clamp 14 is positioned on the horizontal central plane of steel ball 7, clamp 14 be provided with radially extend, provide spacing draw-in groove for steel ball, draw-in groove is equally distributed along circumference, the width of draw-in groove is that the diameter of the width of breach and steel ball 7 is suitable, and steel ball places in this draw-in groove; Ball-collecting rack 6 go to the bottom and ball carriage 8 on the top between distance suitable with steel ball 7 diameters.
The endoporus of ball-collecting rack 6 is up big and down small axial step cylindrical hole, be provided with spring base in the stepped cylindrical hole, spring base is suitable between main shaft 12 and ball-collecting rack 6 inwalls and the space between the shape of its underpart, size and the shoulder hole, main shaft 12, its top is that internal diameter and main shaft 12 diameters are complementary, external diameter is less than the hollow cylindrical of the big bore dia of ladder cylindrical hole, and joint, spring base upper and lower part is a boss radially.Be provided with the spring 3 around main shaft 12 between spring base top and ball-collecting rack 6 inwalls, spring 3 bottoms fall within radially on the boss, are positioned on the main shaft 12 between spring 3 tops and axle head to be rotary with nut 2.
Be provided with fixed cover 5 above the ball-collecting rack 6, the upper surface of fixed cover 5 is concordant with end cap 1 soffit, is provided with sealing ring 4 between them.The outer wall on ball-collecting rack 6 tops is the gradually narrow conical surface that makes progress, the conical surface that the top conical surface of the lower shape of the endoporus of fixed cover 5 and ball-collecting rack 6 is complementary, two conical surfaces form the air flue 16 of adjustable joint throughput, this air flue 16 is communicated with external air source by cavity between fixed cover 5 and the end cap 1 and the air flue on the end cap 1, and this air flue 16 also is communicated with air flue in the pneumatic drilling machine body.
On ball-collecting rack 6, be provided with the pore 15 in axial connection air flue and steel ball 7 spaces of living in; The gap in 13 pairs of main shafts of end ring 9 and back-up ring and bearing and motor gear space of living in seals.
Claims (8)
1, a kind of pneumatic drilling machine speed limiting mechanism, the main shaft that comprises pneumatic drilling machine, it is characterized in that: be fixed with ball carriage (8) on the main shaft in the pneumatic drilling machine air flue (12), ball carriage (8) upper surface is provided with the groove of edge for outside tapered slope of upwards stretching out, be provided with movable ball-collecting rack (6) above the ball carriage (8), the soffit of ball-collecting rack (6) is provided with the top groove corresponding grooves with ball carriage (8), is provided with the steel ball (7) of symmetrical distribution in the cavity that two grooves of ball-collecting rack (6) and ball carriage (8) form; Also be provided with fixed cover (5) on the top of ball-collecting rack (6), the bottom of the endoporus of fixed cover (5) cooperates with ball-collecting rack (6) top; Ball-collecting rack (6) is sleeved on the main shaft (12) of pneumatic drilling machine, and the main shaft top, pneumatic drilling machine of ball-collecting rack (6) is provided with the spring (3) that pretension is used; The outside air flue of pneumatic drilling machine is communicated to the top of fixed cover (5), also is communicated on the air flue of pneumatic drilling machine inside through gap between fixed cover (5) and the ball-collecting rack (6).
2, pneumatic drilling machine speed limiting mechanism according to claim 1 is characterized in that the top outer rim of described ball-collecting rack (6) is provided with upwards gradually narrow taper surface, and the bottom of the endoporus of fixed cover (5) also is provided with the corresponding taper surface of taper surface with ball-collecting rack (6).
3, pneumatic drilling machine speed limiting mechanism according to claim 1, it is characterized in that being provided with in the cavity between described ball-collecting rack (6) and the ball carriage (8) clamp (14) of restriction steel ball (7) relative position, clamp (14) be provided with radially extend, along the equally distributed draw-in groove of circumference, steel ball (7) places in this draw-in groove.
4, pneumatic drilling machine speed limiting mechanism according to claim 1, the outward flange that it is characterized in that described ball-collecting rack (6) has the edge of the bottom surface that extends downward ball carriage (8), and the outward flange of ball carriage (8) cooperates with the internal diameter of ball-collecting rack (6) edge.
5,, it is characterized in that described ball-collecting rack (6) inner edge place has the annular projection of downward extension according to claim 1 or 4 described pneumatic drilling machine speed limiting mechanisms; The clamp (14) that is provided with in ball-collecting rack (6) and ball carriage (8) cavity is arranged on the annular projection at inner edge place of ball-collecting rack (6).
6, pneumatic drilling machine speed limiting mechanism according to claim 5 is characterized in that the inside of the annular projection that extend described ball-collecting rack (6) inner edge bottom is provided with shoulder hole downwards, and shoulder hole is up big and down small axial step cylindrical hole; Be provided with spring base in the shoulder hole, spring base is positioned between main shaft (12) and ball-collecting rack (6) inwall, the shape of its underpart, size and shoulder hole are suitable, and the external diameter on its top is less than the big bore dia of the shoulder hole of ball-collecting rack (6), and the middle part of spring base is provided with a boss radially; Spring (3) is sleeved on spring base and the main shaft, spring bottom places radially on the boss, the length of spring exceeds the top of spring base, the tip position of spring base is lower than or is positioned at the position that spring is in limit when compression spring top, and the main shaft of the top pneumatic drilling machine of spring (3) is provided with the nut (2) of holddown spring (3) usefulness.
7, pneumatic drilling machine speed limiting mechanism according to claim 1, it is characterized in that described fixed cover (5) is arranged between the soffit of ball-collecting rack (6) and end cap (1), end cap (1) is provided with the air inlet that is communicated with fixed cover (5) upper cavity, gap between ball-collecting rack (6) and the fixed cover (5) and pneumatic drilling machine gas inside channel connection.
8, according to claim 1 or 7 described pneumatic drilling machine speed limiting mechanisms, it is characterized in that described ball-collecting rack (6) is provided with the pore (15) that is communicated with air flue and steel ball (7) space of living in, between the bearing (10) of ball carriage (8) and main shaft (12), be provided with the end ring (9) that sealing gas is used, be provided with the back-up ring (13) that sealing gas is used above the ball carriage (8); Also be provided with sealing ring between the upper surface of fixed cover (5) and end cap (1) soffit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200783533U CN201241610Y (en) | 2008-08-20 | 2008-08-20 | Speed limiting mechanism of pneumatic drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200783533U CN201241610Y (en) | 2008-08-20 | 2008-08-20 | Speed limiting mechanism of pneumatic drilling machine |
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| Publication Number | Publication Date |
|---|---|
| CN201241610Y true CN201241610Y (en) | 2009-05-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200783533U Expired - Fee Related CN201241610Y (en) | 2008-08-20 | 2008-08-20 | Speed limiting mechanism of pneumatic drilling machine |
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| Country | Link |
|---|---|
| CN (1) | CN201241610Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818663A (en) * | 2010-04-09 | 2010-09-01 | 大连造船厂工具实业公司 | Speed-limiting device for air inlet and outlet pipeline |
| CN102220836A (en) * | 2011-06-10 | 2011-10-19 | 湖南文理学院 | Rotating power head of coaxial space movable tooth transmission drill |
-
2008
- 2008-08-20 CN CNU2008200783533U patent/CN201241610Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818663A (en) * | 2010-04-09 | 2010-09-01 | 大连造船厂工具实业公司 | Speed-limiting device for air inlet and outlet pipeline |
| CN101818663B (en) * | 2010-04-09 | 2014-06-04 | 大连造船厂工具实业公司 | Speed-limiting device for air inlet and outlet pipeline |
| CN102220836A (en) * | 2011-06-10 | 2011-10-19 | 湖南文理学院 | Rotating power head of coaxial space movable tooth transmission drill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Speed limiting mechanism of pneumatic drilling machine Effective date of registration: 20101126 Granted publication date: 20090520 Pledgee: Chinese bank Limited by Share Ltd Shijiazhuang Yudong branch Pledgor: Shijiazhuang Coal Equipment Manufacturing Co., Ltd.|Hebei Ji Kai Industrial Group Co., Ltd. Registration number: 2010990000979 |
|
| C56 | Change in the name or address of the patentee |
Owner name: SHIJIAZHUANG ZHONGMEI COAL MINE EQUIPMENT MANUFACT Free format text: FORMER NAME: SHIJIAZHUANG CHINA COAL EQUIPMENT MANUFACTURING CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 050035 No. 89 the Yellow River Avenue, Shijiazhuang hi tech Development Zone, Hebei Patentee after: Shijiazhuang Zhongmei Coal Mine Equipment Manufacture Co., Ltd. Address before: 050035 No. 89, the Yellow River Avenue, hi tech Zone, Hebei, Shijiazhuang Patentee before: Shijiazhuang China Coal Equipment Manufacturing Co., Ltd. |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20110615 Granted publication date: 20090520 Pledgee: Chinese bank Limited by Share Ltd Shijiazhuang Yudong branch Pledgor: Shijiazhuang Coal Equipment Manufacturing Co., Ltd.|Hebei Ji Kai Industrial Group Co., Ltd. Registration number: 2010990000979 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090520 Termination date: 20140820 |
|
| EXPY | Termination of patent right or utility model |