CN212273168U

CN212273168U - Pneumatic tool and exhaust valve

Info

Publication number: CN212273168U
Application number: CN202020831308.1U
Authority: CN
Inventors: 林学军
Original assignee: Taitian Group Co ltd
Current assignee: Taitian Group Co ltd
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-01-01
Anticipated expiration: 2030-05-18

Abstract

The utility model discloses a pneumatic tool and an exhaust valve, wherein, the exhaust valve comprises a valve body and a valve rod arranged in the valve body; the valve body is provided with a first inner cavity and a second inner cavity, and an adjusting air passage communicated with the first inner cavity and the second inner cavity is arranged between the first inner cavity and the second inner cavity; the first inner cavity is provided with an opening end used for being communicated with the pneumatic motor, and the side wall of the second inner cavity is provided with an exhaust port; the valve rod can move along the axial direction of the adjusting air passage to change the flow area of the adjusting air passage. The utility model provides a pneumatic tool can adjust the displacement and then change pneumatic motor power and rotational speed through the exhaust valve, ensures that pneumatic tool can both obtain the torsion value of high accuracy between each torsion interval.

Description

Pneumatic tool and exhaust valve

Technical Field

The utility model relates to a pneumatic tool technical field, in particular to discharge valve. The utility model discloses still relate to a pneumatic tool including this discharge valve.

Background

The oil pulse torque setting tool converts the rotation energy of the pneumatic motor into oil pulse and converts the oil pulse into fastening torque for screwing and disassembling the threaded fastener. The pulse torque is generated by the rotation of the oil cylinder of the pulse generator and is transmitted to the load end through the main shaft.

At present, most exhaust valves of oil pressure pulse torque setting tools on the market adopt a common straight-line structure, the structure does not have the function of adjusting the power of a motor, and the tool cannot be guaranteed to have a proper pulse number in each torque interval, so that when a certain torque value (particularly a low torque interval) is set, the torque precision of the tool is reduced, and the expected precision requirement cannot be met.

If a certain oil pulse torque setting tool (the torque range is 50-100Nm) is adopted, if an exhaust valve device in straight row is adopted, the pneumatic motor of the tool is always kept in the maximum power state (the highest rotating speed), and the output accuracy of the tool torque can be maintained at a high level when the tool is set to various torque values in the interval of 70-100 Nm. Because the number of pulses required to reach the target torque value from the start of screwing the tool is at a suitable value, for example, 10-20 pulses. When the number of pulses is small, the target torsion is achieved, and the torsion error is large; if the number of pulses is too large, the screwing time is too long, the efficiency is low, and the abrasion is aggravated, so that the proper number of pulses is a key index for ensuring the efficiency, the precision and the service life; however, when the torque of the tool is set to each torque value in the interval of 50-70Nm, if the tool motor still maintains the maximum rotation speed, the number of pulses required for the tool to start screwing the screw to reach the target torque value may be reduced to only 5-8, and although the speed is high, the torque accumulation accuracy may be reduced, and the target requirement may not be met.

Therefore, how to improve the torque output accuracy becomes a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an exhaust valve, this exhaust valve can adjust the air displacement and then change pneumatic motor power and rotational speed, ensures that pneumatic tool can both obtain the torsion value of high accuracy between each torsion interval. Another object of the present invention is to provide a pneumatic tool comprising the above exhaust valve.

In order to achieve the purpose, the utility model provides an exhaust valve, which comprises a valve body and a valve rod arranged in the valve body; the valve body is provided with a first inner cavity and a second inner cavity, and an adjusting air passage communicated with the first inner cavity and the second inner cavity is arranged between the first inner cavity and the second inner cavity;

the first inner cavity is provided with an opening end used for being communicated with the pneumatic motor, and the side wall of the second inner cavity is provided with an exhaust port; the valve rod can move along the axial direction of the adjusting air passage to change the flow area of the adjusting air passage.

Optionally, the cross-sectional area of the regulating air passage decreases in a direction from the second inner cavity to the first inner cavity, the valve rod is provided with a valve head matched with the regulating air passage, and the cross-sectional area of the valve head increases in a direction from the first inner cavity to the second inner cavity.

Optionally, the regulating airway is sealed when the valve head fully conforms to the regulating airway.

Optionally, the valve head is in a circular truncated cone shape, and the adjusting air passage has a tapered abutting surface matched with the valve head.

Optionally, an end cover for sealing the second inner cavity is arranged at one end, far away from the adjusting air passage, of the second inner cavity, and the valve rod is screwed with the end cover through threads.

Optionally, a threaded hole matched with the valve rod is formed in the axis of the end cover, and the valve rod and the adjusting air passage are coaxially arranged.

Optionally, the valve rod is sleeved with a pre-compression spring at its periphery, and two ends of the pre-compression spring respectively abut against the end cover and the valve head.

Optionally, the tail of the valve rod is provided with a first screwing matching part used for matching with a wrench, and/or the tail of the end cover is provided with a second screwing matching part used for matching with the wrench.

Optionally, a noise reduction filter element is arranged on the periphery of the second inner cavity, and a protective net is arranged between the noise reduction filter element and the side wall of the second inner cavity.

The utility model also provides a pneumatic tool, including above-mentioned arbitrary discharge valve.

Compared with the prior art, the utility model provides a position of discharge valve accessible adjustment valve rod for the axial displacement that the air flue was also adjusted to the axial of valve body also is followed to the valve rod, thereby makes the valve rod shelter from to the certain shutoff of air flue formation, changes the through-flow area who adjusts the air flue. When the open end of the first inner cavity of the exhaust valve is communicated with the pneumatic motor, the exhaust of the pneumatic motor enters the first inner cavity, then enters the second inner cavity through the adjusting air passage and is exhausted from the exhaust port formed in the side wall of the second inner cavity. When the flow area of the air passage is adjusted to be changed, the air displacement of the pneumatic motor is limited, the air inflow of the air inlet system entering the pneumatic motor is changed, the power and the rotating speed of the pneumatic motor are changed, the pulse number generated by the driving of the pneumatic motor is matched with the target torque when the target output torque is changed, and the pneumatic tool obtains high-precision torque values in each torque space.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a longitudinal sectional view of an exhaust valve according to an embodiment of the present invention;

fig. 2 is an exploded view of fig. 1.

Wherein:

1-sealing ring, 2-valve body, 21-annular groove, 22-first inner cavity, 23-adjusting air channel, 24-second inner cavity, 25-exhaust port, 3-valve rod, 31-valve head, 32-first screwing matching part, 4-silencing filter element, 5-protective net, 6-precompression spring, 7-end cover, 71-second screwing matching part.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 and 2, fig. 1 is a longitudinal sectional view of an exhaust valve according to an embodiment of the present invention, and fig. 2 is an exploded view of fig. 1.

The utility model provides an exhaust valve includes valve body 2 and the valve rod 3 of setting in valve body 2, and valve body 2 is equipped with first inner chamber 22 and second inner chamber 24, and first inner chamber 22 and second inner chamber 24 communicate through adjusting air flue 23. The opening end of the first inner cavity 22 is used for being connected with an air motor, the side wall of the second inner cavity 24 is provided with an exhaust port 25, the valve rod 3 is used for moving along the axial direction of the adjusting air passage 23, the valve rod 3 feeds or retreats relative to the adjusting air passage 23, the flow area and the flow rate of the adjusting air passage 23 are changed, the exhaust and air inflow of the air motor are further influenced, the power (rotating speed) of the air motor is changed, and the air motor is matched with a proper pulse number to output a target torque, so that the air tool can obtain a high-precision value of the torque force in each torque force interval.

The pneumatic tool and the exhaust valve provided by the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, in the embodiment provided by the present invention, the valve body 2 is a cylindrical shell structure having a hollow inner cavity, wherein the hollow inner cavity includes a first inner cavity 22 and a second inner cavity 24 which are communicated from top to bottom, the first inner cavity 22 and the second inner cavity 24 are generally coaxially arranged to form a cylindrical inner cavity, and the adjusting air passage 23 plays a role of communicating the first inner cavity 22 and the second inner cavity 24. The valve rod 3 is specifically arranged in the second inner cavity 24 and is arranged along the valve body 2 in the axial direction of the second inner cavity 24, so that the valve body 2 can feed or retract towards the adjusting air passage 23, a certain blocking effect is realized on the adjusting air passage 23, and the flow area and the flow rate of the adjusting air passage 23 are changed. The side wall of the second inner cavity 24 is provided with an exhaust port 25

In order to facilitate the communication between the valve body 2 and the exhaust passage of the pneumatic motor, the first inner cavity 22 is provided with an open end, the open end is inserted into the exhaust passage of the pneumatic motor, meanwhile, the peripheral part of the first inner cavity 22 is provided with a sealing ring 1, the outer wall of the first inner cavity 22 is provided with an annular groove matched with the sealing ring 1, and the depth of the groove is smaller than the thickness of the sealing ring 1.

The circumferential portion of the first inner cavity 22 is further provided with an annular groove 21 used for being matched with the positioning mechanism, the annular groove 21 is arranged below the annular groove, and the depth of the annular groove 21 is usually greater than that of the annular groove, so that the valve body 2 is ensured to be matched with the circumferential positioning mechanism (such as a positioning ring or a positioning pin) to form positioning and sealing on the valve body 2, and the shaking of the valve body 2 along the axial direction is reduced.

The adjusting air passage 23 can be set into various shapes according to the adjusting requirement, the whole section of the adjusting air passage 23 is reduced from the second inner cavity 24 to the first inner cavity 22, the valve rod 3 is provided with a valve head 31 matched with the adjusting air passage 23 in structure, and the cross section of the valve head 31 is gradually increased from the first inner cavity 22 to the second inner cavity 24. Therefore, when the valve rod 3 is fed into the adjusting air passage 23 along the axial direction of the adjusting air passage 23, the distance between the valve head 31 and the side wall of the adjusting air passage 23 is gradually reduced, the effective blocking area of the valve head 31 on the adjusting air passage 23 is gradually increased, and the flow area, namely the flow rate, of the adjusting air passage 23 is reduced.

Conversely, when the valve rod 3 retreats away from the regulating air passage 23 along the axial direction of the regulating air passage 23, the axial length of the valve head 31 extending into the regulating air passage 23 is reduced, the distance between the valve head 31 and the side wall of the regulating air passage 23 is increased, the blocking effect of the valve head 31 on the regulating air passage 23 is reduced, and the flow area and the flow rate of the regulating air passage 23 are increased. When the valve head 31 is completely withdrawn and far away from the regulating air passage 23, the flow area and the flow rate of the regulating air passage 23 are maximized, the air exhaust and air intake of the air motor can be maximized, and the power and the rotating speed of the air motor are maximized.

Preferably, through the shape of reasonable setting regulation air flue 23 and valve head 31 for valve head 31 and the lateral wall formfitting of regulation air flue 23, when valve head 31 is laminated regulation air flue 23 completely, adjust air flue 23 and can be sealed, adjust air flue 23 shutoff this moment, first inner chamber 22 and second inner chamber 24 are kept apart, and the discharge valve no longer plays the exhaust effect.

In one embodiment, the regulating air duct 23 has a side wall tapered in a cone shape, and the valve head 31 is a circular truncated cone shaped valve head 31 matched with the side wall tapered in a cone shape, as shown in fig. 1 in particular. When the valve head 31 moves towards or away from the adjusting air passage 23, the side surface of the valve head 31 is always parallel to the inner wall of the adjusting air passage 23, when the valve head 31 extends into the adjusting air passage 23, the blocking area formed on the adjusting air passage 23 is changed, and the flow area of the adjusting air passage 23 is changed accordingly. And the shape of the conical side wall and the shape of the circular truncated cone-shaped valve head 31 are regular, so that the processing and molding are convenient.

In another specific embodiment, the valve head 31 may also be configured as a multi-step boss, the sidewall of the adjusting air passage 23 has a multi-step cylindrical groove matching with the multi-step boss, the diameter of the multi-step boss increases in sequence from the first inner cavity 22 to the second inner cavity 24, the diameter of the multi-step cylindrical groove increases in sequence from the first inner cavity 22 to the second inner cavity 24, and the diameter of any cylindrical groove is greater than or equal to the diameter of the boss corresponding to the cylindrical groove.

Obviously, the fitting of the adjusting air duct 23 and the valve head 31 is not limited to the above structure, and the fitting surfaces of the two may also be irregular fitting surfaces that are tapered from the second inner cavity 24 to the first inner cavity 22, which is not limited in this application, as long as the flow area of the adjusting air duct 23 can be changed by feeding the valve rod 3, and all the fitting surfaces fall within the protection scope of this application.

In fact, even if the flow area of the adjusting air passage 23 is not changed by feeding the valve rod 3, when the axial length of the valve rod 3 extending into the adjusting air passage 23 is changed, even if the flow area of the adjusting air passage 23 is not changed, the valve rod 3 changes the flow field in the adjusting air passage 23, and also changes the flow rate, so as to change the rotation speed of the pneumatic motor, and only the adjusting effect is not as obvious as the change of the flow area.

Referring to fig. 1 and 2 in combination, in order to realize axial feeding and retraction of the valve rod 3 relative to the adjusting air passage 23, particularly, an end cover 7 is disposed on an end surface of the second inner cavity 24 away from the adjusting air passage 23, the valve rod 3 is screwed with the end cover 7, the valve head 31 is axially fed or retracted by screwing the valve rod 3 clockwise or counterclockwise, corresponding marks can be made on the thread section of the valve rod 3 in advance for different target torques corresponding to different feed amounts of the valve rod 3, and then the feed retraction amount of the valve rod 3 can be adjusted according to the target torques and the corresponding marks on the thread section of the valve rod 3.

In a preferred embodiment of the present invention, the threaded hole for cooperating with the valve rod 3 is provided at the axial center of the end cap 7, in other words, the valve rod 3 and the adjusting air passage 23 are coaxially arranged and the axial centers of the two coincide. The end cap 7 is also screwed into the open end of the second interior cavity 24. In order to facilitate screwing the valve rod 3 and the end cover 7, the tail part of the valve rod 3 is provided with a first screwing matching part 32, and the tail part of the end cover 7 is provided with a second screwing matching part 71. The first screwing fitting portion 32 may be a triangular hole, a quadrangular hole, a hexagonal hole, a bolt head, or the like, which is convenient to screw by a wrench tool; the second twist fit portion 71 may be a hexagonal groove or a plurality of symmetrically disposed sets of counter bores.

Obviously, in practical implementation, the relative offset and dislocation of the axes of the valve rod 3 and the regulating air channel 23 are allowed, but in this situation, the feed amount of the valve rod 3 and the change of the flow area of the regulating air channel 23 are no longer in a linear relationship.

Furthermore, the valve rod 3 is circumferentially sleeved with a pre-compression spring 6, and two ends of the pre-compression spring 6 respectively abut against the valve head 31 and the end cover 7. The pre-compressed spring 6 can provide a certain supporting force for the valve head 31, and the stability of the valve head 31 is improved. The second cavity is also provided with a silencing filter element 4 and a protective screen 5, and the protective screen 5 is arranged outside the silencing filter element 4, namely between the silencing filter element 4 and the inner wall of the second cavity. The silencing filter element 4 can reduce exhaust noise, and the protective net 5 is arranged to prevent the surface silencing filter element 4 from being blown out from the exhaust port 25.

The utility model also provides a pneumatic tool, including air intake system, pneumatic motor, impact mechanism and the connection pneumatic motor exhaust passage like the above-mentioned embodiment described discharge valve. The air inlet system supplies air to the pneumatic motor to push the pneumatic motor to rotate, the impact mechanism is in rotational connection with the pneumatic motor to convert continuous rotation of the pneumatic motor into pulse impact, output torque is accumulated by means of the pulse impact, the exhaust volume of the pneumatic motor is adjusted through the exhaust valve, the rotating speed of the pneumatic motor is changed, the rotating speed of the pneumatic motor, namely the pulse number generated by impact, is matched with target torque, and the pneumatic tool is guaranteed to maintain high torque accuracy in each torque interval. Other parts of the pneumatic tool can be referred to the prior art and the application is not expanded in detail.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

It is right above that the utility model provides a pneumatic tool and discharge valve have carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. An exhaust valve is characterized by comprising a valve body (2) and a valve rod (3) arranged in the valve body (2); the valve body (2) is provided with a first inner cavity (22) and a second inner cavity (24), and an adjusting air passage (23) for communicating the first inner cavity (22) with the second inner cavity (24) is arranged between the first inner cavity (22) and the second inner cavity (24);

the first inner cavity (22) is provided with an opening end used for being communicated with a pneumatic motor, and the side wall of the second inner cavity (24) is provided with an exhaust port (25); the valve rod (3) can move along the axial direction of the adjusting air passage (23) to change the flow area of the adjusting air passage (23).

2. An exhaust valve according to claim 1, characterized in that the cross-sectional area of the regulating air passage (23) decreases in the direction from the second inner chamber (24) to the first inner chamber (22), and that the valve stem (3) is provided with a valve head (31) cooperating with the regulating air passage (23), the cross-sectional area of the valve head (31) increasing in the direction from the first inner chamber (22) to the second inner chamber (24).

3. An exhaust valve according to claim 2, characterized in that the regulating airway (23) is sealed when the valve head (31) fully conforms to the regulating airway (23).

4. An air vent valve according to claim 2, wherein the valve head (31) is frustoconical and the regulating air passage (23) has a conical abutment surface for engagement with the valve head (31).

5. The venting valve according to any one of claims 2 to 4, wherein an end of the second inner cavity (24) far away from the regulating air passage (23) is provided with an end cap (7) for sealing the second inner cavity (24), and the valve rod (3) is screwed with the end cap (7).

6. An exhaust valve according to claim 5, characterized in that the axis of the end cover (7) is provided with a threaded hole matched with the valve rod (3), and the valve rod (3) and the regulating air channel (23) are coaxially arranged.

7. An exhaust valve according to claim 5, characterized in that the valve stem (3) is peripherally sheathed with a pre-compressed spring (6), the ends of the pre-compressed spring (6) abutting against the end cap (7) and the valve head (31), respectively.

8. An air vent valve according to claim 5, wherein the end of the valve stem (3) is provided with a first twist fit (32) for engagement with a wrench and/or the end of the end cap (7) is provided with a second twist fit (71) for engagement with a wrench.

9. The exhaust valve according to claim 5, characterized in that the periphery of the second inner cavity (24) is provided with a noise reduction filter element (4), and a protective net (5) is arranged between the noise reduction filter element (4) and the side wall of the second inner cavity (24).

10. A pneumatic tool, comprising an exhaust valve according to any one of claims 1 to 9.