CN108679263B

CN108679263B - Reversing valve and chain tightening device

Info

Publication number: CN108679263B
Application number: CN201810584084.6A
Authority: CN
Inventors: 王跃平
Original assignee: CHANGZHI YUANLU MINING EQUIPMENT CO LTD
Current assignee: CHANGZHI YUANLU MINING EQUIPMENT Co.,Ltd.
Priority date: 2018-06-08
Filing date: 2018-06-08
Publication date: 2021-10-19
Anticipated expiration: 2038-06-08
Also published as: CN108679263A

Abstract

The invention discloses a reversing valve and a chain tightening device, wherein the reversing valve comprises: the valve body is provided with air vents communicated with the inside and the outside, and the air vents comprise a first air vent, a second air vent, a third air vent and a fourth air vent; the valve core is assembled in the valve body, a first air outlet hole and a second air outlet hole which are communicated with the inside and the outside are formed in the wall of the valve core, a first groove and a second groove are formed in the outer wall surface of the valve core, and an air inlet is formed in the valve core; the reversing mechanism is used for driving the valve plug to move relative to the valve body; when the valve core moves to a first position relative to the valve body, the first air outlet hole is opposite to the first air vent, and the second groove is communicated with the third air vent and the fourth air vent; when the valve core moves to a second position relative to the valve body, the second air outlet hole is opposite to the third air outlet, and the first groove is communicated with the first air vent and the second air vent. The invention can simplify the reversing operation of the pneumatic motor.

Description

Reversing valve and chain tightening device

Technical Field

The invention relates to the technical field of tightening equipment, in particular to a reversing valve and a chain tightening device.

Background

The description of the background of the invention pertaining to the related art to which this invention pertains is given for the purpose of illustration and understanding only of the summary of the invention and is not to be construed as an admission that the applicant is explicitly or implicitly admitted to be prior art to the date of filing this application as first filed with this invention.

Chain tighteners are used in a variety of industries, such as in scraper conveyors associated with coal mining machines. The chain that connects between each scraper blade in the colliery scraper conveyor in the pit, the scraper chain is too lax, can cause the chain to block up in the derailleur, leads to scraper chain jump chain, falls the chain, falls accidents such as saying. And the chain tightening device can tighten the chain to a proper degree.

The chain tightening device can adopt manual drive or motor drive and the like. The chain tightening device driven by the motor is mostly used for large-scale equipment. Since the chain tensioner needs to be loosened and tightened, the driving mechanism for driving the chain tensioner needs to be operated forward and backward. The cost is higher when the motor is adopted for driving. The pneumatic motor is driven by compressed air, and has small volume and low cost. However, when the output direction of the pneumatic motor needs to be changed, the air inlet and the air outlet need to be changed, and the operation is very inconvenient.

Disclosure of Invention

In view of the above, the present invention provides a reversing valve and a chain tightening device, and mainly aims to simplify the reversing operation of a pneumatic motor.

In order to achieve the purpose, the invention mainly provides the following technical scheme:

in a first aspect, an embodiment of the present invention provides a reversing valve, including:

the valve body is provided with air vents communicated with the inside and the outside, and the air vents comprise a first air vent, a second air vent, a third air vent and a fourth air vent;

the valve core is assembled in the valve body, a first air outlet hole and a second air outlet hole which are communicated with the inside and the outside are formed in the wall of the valve core, a first groove and a second groove are formed in the outer wall surface of the valve core, and an air inlet is formed in the valve core;

the reversing mechanism is used for driving the valve core to move relative to the valve body; wherein

When the valve core moves to a first position relative to the valve body, the first air outlet hole is opposite to the first air vent, and the second groove is communicated with the third air vent and the fourth air vent;

when the valve core moves to a second position relative to the valve body, the second air outlet hole is opposite to the third air outlet hole, and the first groove is communicated with the first air outlet hole and the second air outlet hole.

Preferably, in the above embodiment, at least the outer wall surface of the valve body having the first groove and the second groove and the first vent hole and the second vent hole is in sealing engagement with the inner wall surface of the valve body having the vent hole.

Preferably, as the above embodiment, a positioning structure is provided between the valve element and the valve body.

As a preferable mode of the above embodiment, the valve body is located at the first position or the second position by relative rotation with the valve body; or the valve core is located at the first position or the second position through relative sliding with the valve body.

Preferably, in the above embodiment, the valve body has a cylindrical shape, and the valve body has a cylindrical shape.

Preferably, in the above embodiment, the first vent hole, the second vent hole, the third vent hole and the fourth vent hole are formed in a circumferential surface of the valve body, the first vent hole, the second vent hole, the first groove and the second groove are formed in a circumferential surface of the valve element, and the gas inlet is formed in an end surface of the valve element.

As a preference of the above embodiment, the first vent and the second vent are located on the same circumference of the valve body, and the third vent and the fourth vent are located on the same circumference of the valve body; the first air outlet hole and the first groove are located on the same circumference of the valve core, and the second air outlet hole and the second groove are located on the same circumference of the valve core.

Preferably, the reversing mechanism is a handle, and the handle is detachably connected with the valve core.

Preferably, the valve body comprises a cylinder and an end cover, the cylinder is provided with a connecting flange plate, and the end cover is connected with the flange plate through a bolt.

In a second aspect, an embodiment of the invention provides a chain tightening device, which includes a driving mechanism, a rack sleeve, a rack and a first hook, wherein the rack sleeve is fixedly connected to the driving mechanism, the rack is assembled in the rack sleeve, the rack is in transmission connection with the driving mechanism, the driving mechanism drives the rack to slide along the rack sleeve, the rack is connected to the first hook, a fixing member is connected to the rack sleeve, the driving mechanism includes a speed reducer and a pneumatic motor, the pneumatic motor is in transmission connection with the speed reducer, the speed reducer is in transmission connection with the rack, a first air hole of the pneumatic motor is connected to a reversing valve through a first air pipe, a second air hole of the pneumatic motor is connected to the reversing valve through a second air pipe, and the reversing valve is connected to a compressed air source.

As a preferable example of the above embodiment, the direction changing valve is the direction changing valve described in any one of the above embodiments, the first air vent is connected to the first air hole through a first air duct, and the third air vent is connected to the second air hole through a second air duct.

Preferably, in the above embodiment, the first hook is rotatably connected to the rack by a rotary connection mechanism.

As a preference of the above embodiment, a rotation axis of the first hook body rotating with respect to the rack is parallel to the rack.

Preferably, in the above embodiment, the rotary connection mechanism is a universal connector.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

the reversing valve provided by the embodiment of the invention can easily realize output reversing of the pneumatic motor and simplify the operation. According to the embodiment of the invention, the first vent and the third vent of the reversing valve are respectively connected with two air holes of the pneumatic motor, compressed air is controlled by the reversing valve to be conveyed to the pneumatic motor from the first vent, and then the compressed air returns to the reversing valve from the third vent and is discharged from the fourth vent; or the compressed air is conveyed to the pneumatic motor through the third air port, then returns to the reversing valve through the first air port and is exhausted through the second air port. The output reversing of the pneumatic motor can be realized without plugging an air pipe between two air holes of the pneumatic motor.

Drawings

FIG. 1 shows an exploded schematic view of a first embodiment of the reversing valve of the present invention;

FIG. 2 shows a schematic view of the assembled body of the first embodiment of the reversing valve of the present invention;

FIG. 3a is a schematic view of a second embodiment of the reversing valve of the present invention with the valve spool in a first position relative to the valve body;

FIG. 3b is a schematic view of the valve spool in a second position relative to the valve body in a second embodiment of the reversing valve of the present invention;

FIG. 4a is a schematic view showing the development of the circumferential surface of a valve body in a third embodiment of the direction valve of the present invention;

FIG. 4b is a schematic view showing the development of the peripheral surface of the valve element in the third embodiment of the direction valve according to the present invention;

FIG. 5 shows an exploded view of a fourth embodiment of the reversing valve of the present invention;

FIG. 6 shows an exploded view of a fifth embodiment of the reversing valve of the present invention;

FIG. 7 is a schematic structural view showing an embodiment of the chain tensioner of the present invention;

fig. 8 shows a schematic view of the connection of the first hook body to an embodiment of the swivel connection in an embodiment of the invention.

The notation in the figure is: a valve body 1; a first vent 11; a second vent 12; a third vent port 13; a fourth air vent 14; a flange 15; an end cap 16; a valve core 2; a first air outlet hole 21; a second outlet aperture 22; a first groove 23; a second groove 24; an air inlet 25; a reversing mechanism 3; a seal ring 4; a first limit plate 7; a second limiting plate 8; a positioning groove 51; positioning pins 52; a fixing member 400; a drive mechanism 600; a rack housing 700; a rack 800; a first hook body 900; a decelerator 610; a pneumatic motor 620; a first air hole 621; a second air hole 622; a first air duct 5; a second air duct 6.

Detailed Description

The present invention will be described in further detail with reference to the following examples, which are not intended to limit the invention thereto. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

An embodiment of the present invention provides a reversing valve, and fig. 1 shows an exploded schematic view of a first embodiment of the reversing valve of the present invention; FIG. 2 shows a schematic view of the assembled body of the first embodiment of the reversing valve of the present invention; FIG. 3a is a schematic view of a second embodiment of the reversing valve of the present invention with the valve spool in a first position relative to the valve body; FIG. 3b is a schematic view of the valve spool in a second position relative to the valve body in a second embodiment of the reversing valve of the present invention; FIG. 4a is a schematic view showing the development of the circumferential surface of a valve body in a third embodiment of the direction valve of the present invention; FIG. 4b is a schematic view showing the development of the peripheral surface of the valve element in the third embodiment of the direction valve according to the present invention; FIG. 5 shows an exploded view of a fourth embodiment of the reversing valve of the present invention; figure 6 shows an exploded view of a fifth embodiment of the reversing valve of the present invention. Referring to fig. 1 to 6, a direction valve of an embodiment of the present invention includes:

the valve comprises a valve body 1, wherein the valve body 1 is provided with air vents communicated with the inside and the outside, and the air vents comprise a first air vent 11, a second air vent 12, a third air vent 13 and a fourth air vent 14;

the valve core 2 is assembled in the valve body 1, a first air outlet hole 21 and a second air outlet hole 22 which are communicated with the inside and the outside are formed in the wall of the valve core 2, a first groove 23 and a second groove 24 are formed in the outer wall surface of the valve core 2, and an air inlet 25 is formed in the valve core 2;

the reversing mechanism 3 is used for driving the valve core 2 to move relative to the valve body 1; wherein

When the valve core 2 moves to a first position relative to the valve body 1, the first air outlet hole 21 is opposite to the first air vent 11, and the second groove 24 is communicated with the third air vent 13 and the fourth air vent 14;

when the valve core 2 moves to the second position relative to the valve body 1, the second vent hole 22 is opposite to the third vent hole 13, and the first groove 23 is communicated with the first vent hole 11 and the second vent hole 12.

The reversing valve provided by the embodiment of the invention can easily realize the output reversing of the pneumatic motor 620 and simplify the operation. The first vent 11 and the third vent 13 of the reversing valve of the embodiment of the invention are respectively connected with two air holes of the pneumatic motor 620, compressed air is controlled by the reversing valve to be conveyed to the pneumatic motor 620 from the first vent 11, and then the compressed air returns to the reversing valve from the third vent 13 and is discharged from the fourth vent 14; alternatively, the compressed air is delivered to the pneumatic motor 620 through the third vent 13, then returned to the reversing valve through the first vent 11 and discharged through the second vent 12. By adopting the reversing valve provided by the embodiment of the invention, the output reversing of the pneumatic motor 620 can be realized without plugging an air pipe between two air holes of the pneumatic motor 620.

As a preference of the above embodiment, at least the outer wall surfaces of the spool 2 having the first and

second recesses

23, 24 and the first and second outlet holes 21, 22 are sealingly fitted with the inner wall surface of the valve body 1 having the vent holes. In this embodiment, the valve core 2 and the corresponding wall surface of the valve body 1 are in sealing fit, so that air leakage when the reversing valve conveys high-pressure air to the pneumatic motor 620 can be avoided, and sufficient pressure is ensured to drive the pneumatic motor 620 to work. Of course, the wall surface of the valve body 1 into which the valve body 2 is sealingly engaged is not limited to the wall surface defined in the above preferred embodiment. All wall surfaces at the joint of the valve body 1 and the valve body 2 may be used. For example, when the valve element 2 and the valve body 1 are cylindrical, if the first recess 23 and the second recess 24 and the first vent hole 21 and the second vent hole 22 are provided on the circumferential surface of the valve element 2 and the vent holes are provided on the circumferential surface of the valve body 1, only the outer circumferential surface of the valve element 2 may be in sealing engagement with the inner circumferential surface of the valve body 1.

Of course, other means may be employed to avoid blow-by of the diverter valve. For example, the outer wall surface of the valve body 2 and/or the inner wall surface of the valve body 1 is provided with a seal ring 4. The problem of air leakage can also be avoided by providing the sealing ring 4. The number of the sealing rings 4 and the specific positions of the sealing rings are not particularly limited, as long as the air leakage in the working process of the reversing valve can be reduced. For example, the sealing rings 4 may be respectively arranged around the first groove 23, the second groove 24, the first air outlet hole 21 and the second air outlet hole 22 of the valve core 2 as shown in the figure. Therefore, when the valve core 2 moves to the first position relative to the valve body 1, the first air outlet hole 21 and the periphery of the first air vent 11 are sealed and cannot leak, and when the gas returned by the third air vent 13 is discharged by the fourth air vent 14 through the second groove 24, the sealing ring 4 around the second groove 24 cannot leak; when the valve core 2 moves to the second position relative to the valve body 1, the second vent hole 22 and the periphery of the third vent hole 13 are sealed and cannot leak, and when the gas returned from the first vent hole 11 is discharged from the second vent hole 12 through the first groove 23 by the sealing ring 4 around the first groove 23, the gas cannot leak.

Further, grease may be applied to the surfaces of the valve element 2 and the valve body 1 that face each other. Sealing between two faces can be realized, friction resistance can be reduced, and switching operation is utilized. Of course, the surface seal, the seal ring 4 seal, the grease coating, and the like in the above embodiments may be used alone or in combination.

In order to facilitate the switching operation of the directional control valve, the valve body 1 is moved accurately to the first position or the second position with respect to the valve body 2. In a preferred embodiment of the invention, a positioning structure is arranged between the valve core 2 and the valve body 1. The positioning structure is used for positioning the spool 2 in a first position or a second position with respect to the valve body 1. The specific form of the positioning structure is not limited as long as the valve element 2 is prevented from moving further relative to the valve body 1 when the valve element 2 moves to the first position relative to the valve body 1, or the valve element 2 is prevented from moving further relative to the valve body 1 when the valve element 2 moves to the second position relative to the valve body 1.

For example, the positioning structure may be a stopper that is matched between the valve element 2 and the valve body 1, specifically, the valve body 1 may have a first stopper corresponding to a first position and a second stopper corresponding to a second position, when the valve element 2 moves to the first position relative to the valve body 1, a certain part of the valve element 2 (including a part connected to the valve element 2) acts on the first stopper to prevent the valve element 2 from moving continuously; when the valve core 2 moves to the second position relative to the valve body 1, a certain part (including a part connected with the valve core 2) of the valve core 2 acts with a second stopper to prevent the valve core 2 from moving continuously.

For another example, the positioning structure may be embodied as follows: the valve core 2 has a positioning groove 51 on the outer wall, and the valve body 1 has a positioning pin 52 matching with the positioning groove 51. The positioning pin 52 is located at one end of the positioning groove 51 when the valve element 2 is located at the first position with respect to the valve body 1, and the positioning pin 52 is located at the other end of the positioning groove 51 when the valve element 2 is located at the second position with respect to the valve body 1. The positioning pin 52 may be a bolt, and is screwed into the valve body 1 through one end of a screw hole on the valve body 1 to be matched with the positioning groove 51.

In the embodiment of the present invention, the movement of the valve element 2 with respect to the valve body 1 is not limited, and may be, for example, a rotational movement or a sliding movement. The valve core 2 is positioned at the first position or the second position through relative rotation with the valve body 1, and the embodiment is easy to realize, and the valve body 1 can realize rotation as long as the valve body is cylindrical and has an equiaxial symmetrical shape like a truncated cone. Or the valve core 2 is located at the first position or the second position by sliding relative to the valve body 1. The shape of the valve body 1 and the valve body 2 is not limited to the cylindrical shape, the truncated cone shape, the drum shape, and the like, and the valve body 1 and the valve body 2 may be formed in any shape as long as the valve body 2 can slide in a certain direction. For example, the inner cavity of the valve body 1 is semi-cylindrical, and the valve core 2 is semi-cylindrical matched with the valve body.

As described in the above embodiments, the shape of the valve body 1 and the valve body 2 is not particularly limited in the direction valve according to the embodiment of the present invention. As one preferred embodiment, the valve body 1 is cylindrical and the valve core 2 is cylindrical. This embodiment can realize rotation of the valve element 2 relative to the valve body 1 and also sliding (e.g., in the axial direction) of the valve element 2 relative to the valve body 1. Specifically, the valve body 1 may be a cylinder with one open end or a cylinder with two open ends, and the valve core 2 should be a closed cylinder, and the valve core 2 has an air inlet 25 for inputting compressed air and a first air outlet 21 and a second air outlet 22 for outputting compressed air. After being input into the valve core 2 through the air inlet 25, the compressed air is output through the first air outlet hole 21 or the second air outlet hole 22, and is delivered to the pneumatic motor 620 through the air ports (for example, the first air port 11 opposite to the first air outlet hole 21 and the third air port 13 opposite to the second air outlet hole 22) corresponding to the first air outlet hole 21 or the second air outlet hole 22 on the valve body 1. The compressed air passing through the pneumatic motor 620 is returned to the directional control valve, returned through the third vent 13 and discharged through the fourth vent 14 (when being delivered to the pneumatic motor 620 through the first vent 11), or returned through the first vent 11 and discharged through the second vent 12 (when being delivered to the pneumatic motor 620 through the third vent 13).

In the embodiment of the present invention, the specific positions and arrangement of the vent holes, the air outlet holes, the grooves, and the like are not particularly limited as long as the first position and the second position are in correspondence with each other. For example, as a preferable example of the above embodiment, the first vent hole 11, the second vent hole 12, the third vent hole 13, and the fourth vent hole 14 are provided on the circumferential surface of the valve body 1, the first vent hole 21, the second vent hole 22, the first recess 23, and the second recess 24 are provided on the circumferential surface of the valve body 2, and the intake port 25 is provided on the end surface of the valve body 2. In this embodiment, both the one end opening and the both ends opening can be realized when the valve body 1 is a cylinder.

As another preferred embodiment, fig. 3a is a schematic view of the valve spool 2 in a first position relative to the valve body 1; fig. 3b is a schematic view of the valve spool 2 in a second position relative to the valve body 1. As shown in fig. 3a and 3b, when the valve body 1 and the valve core 2 are both cylindrical (or any shape such as a truncated cone that can rotate relatively, which is described by taking a cylinder as an example), the vent hole may be provided on an end surface of the valve body 1 (in this embodiment, the cylinder has an end surface), the vent hole, and the groove may be provided on an end surface of the valve core 2. The first vent hole 11, the second vent hole 12, the third vent hole 13 and the fourth vent hole 14 are arranged on a concentric circle of one end surface of the valve body 1, the first air outlet hole 21, the second air outlet hole 22, the first groove 23 and the second groove 24 are arranged on a concentric circle of one corresponding end surface of the valve core 2, and the two concentric circles are overlapped. The first outlet aperture 21 in FIG. 3a is opposite the first air port 11 (overlapping in FIG. 3 a), and the second groove 24 communicates the third and

fourth air ports

13 and 14. The valve body 1 is rotated clockwise from the first position of fig. 3a to the second position shown in fig. 3b, the second outlet hole 22 is opposite to the third outlet 13 (overlapping in fig. 3 b), and the first groove 23 connects the first vent 11 and the second vent 12. I.e. the through valve element 2 is arranged on the end surface of the valve element 2 opposite to the air inlet 25.

Referring to fig. 4a and 4b, in another embodiment of the present invention, the first vent 11 and the second vent 12 are located on the same circumference of the valve body 1, and the third vent 13 and the fourth vent 14 are located on the same circumference of the valve body 1; the first outlet hole 21 and the first groove 23 are located on the same circumference of the spool 2, and the second outlet hole 22 and the second groove 24 are located on the same circumference of the spool 2. When the valve core 2 is located at the first position relative to the valve body 1 by rotating the valve core 2 relative to the valve body 1 (shown in the expanded view of fig. 4a and 4b, the valve core 2 is shown to move up and down relatively), the first air outlet hole 21 is opposite to the first air vent 11, and the second groove 24 is communicated with the third air vent 13 and the fourth air vent 14; when the valve core 2 is located at the second position relative to the valve body 1, the second vent hole 22 is opposite to the third vent hole 13, and the first groove 23 is communicated with the first vent hole 11 and the second vent hole 12.

Referring to fig. 5, in another embodiment of the present invention, the valve body 1 is a cylinder with a rectangular cross section, and the main body of the valve core 2 is also rectangular in cross section so as to be adapted to the valve body 1. Of course, the first and

second recesses

23 and 24 and the first and second outlet holes 21 and 22 are provided as long as the spool 2 has a surface that mates with the valve body 1, but not limited thereto. For example, the cross section of the valve core 2 may be a funnel shape formed by splicing two trapezoids, or any other shape. In the present embodiment, the valve body 1 slides on the valve body 2 to be located at the first position or the second position. The first vent 11, the second vent 12, the third vent 13, and the fourth vent 14 are divided into two rows, the first outlet hole 21 and the first groove 23 form one row opposite to the first vent 11 and the second vent 12, and the second outlet hole 22 and the second groove 24 form one row opposite to the third vent 13 and the fourth vent 14. In this embodiment, after the valve core 2 is assembled in the valve body 1, the valve core 2 and the valve body 1 can be assembled and limited while the first position and the second position are positioned by matching the positioning pin 52 with the positioning groove 51. Of course, other structures can be further added to realize the assembly limit of the valve core 2 and the valve body 1. The reversing mechanism 3 for driving the valve element 2 to move relative to the valve element 1 may be a handle fixed to the valve element 2, or may be a gear mechanism provided between the valve element 2 and the valve element 1.

Similarly, in the embodiment in which the valve body 1 slides relative to the valve body 2, the first vent hole 11, the second vent hole 12, the third vent hole 13, and the fourth vent hole 14 may be arranged in a row, and the first vent hole 21, the second vent hole 22, the first groove 23, and the second groove 24 may be arranged in a row, respectively. The specific distribution can be seen in fig. 4a and 4 b.

In the embodiment shown in FIG. 1, the first vents 11, the second vents 12, the third vents 13 and the fourth vents 14 are arranged in two rows, and the first vents 11 and the third vents 13 are arranged diagonally. Referring to fig. 6, on the basis of the embodiment shown in fig. 1, the positions of the first air outlet 21, the second air outlet 22, the first groove 23 and the second groove 24 on the valve core 2 are adjusted, so that the first air vent 11 and the third air vent 13 are in the same row.

In the embodiment of the present invention, the specific configuration of the reversing mechanism 3 is not limited. For example, the reversing mechanism 3 may be a handle, a handgrip (see fig. 1), a gear structure, or the like. A handle is typically attached to the valve element 2, and by holding the handle and applying a force to the valve element 2 in the direction of movement of the valve element 2, the valve element 2 can be driven to slide relative to the valve body 1. Or the handle is connected with the valve core 2, and the valve core 2 is driven to rotate relative to the valve body 1 by the handle. The handle and handle or the like are preferably detachably connected to the cartridge 2. As for the gear structure or other specific form of the reversing mechanism 3 for driving the valve element 2 to rotate or slide relative to the valve element 1, it is easy for those skilled in the art to obtain the mechanism based on the embodiment of the present invention, and will not be described herein again.

In the embodiment of the present invention, the assembly structure of the valve element 2 and the valve body 1 is not particularly limited. For example, as shown in fig. 1 and 2, the valve body 1 includes a cylinder body having a flange 15 and an end cap 16, and the end cap 16 is bolted to the flange 15. After the valve core 2 is assembled in the valve body 1, the end cover 16 is connected with the cylinder body, and the assembly limit of the valve core 2 and the valve body 1 can be realized. For another example, the valve body 1 may also be formed by fastening two symmetrical parts, and the assembly limit of the valve element 2 and the valve body 1 may also be realized. Or, when the valve body 1 is a cylinder with openings at two ends, the assembly limit of the valve core 2 and the valve body 1 can be realized by respectively arranging limiting mechanisms (such as flange plates 15) at two ends of the valve core 2 extending out of the valve body 1. Alternatively, referring to fig. 6, the limiting mechanism is a first limiting plate 7 and a second limiting plate 8, the first limiting plate 7 and the second limiting plate 8 are respectively fixedly connected to two ends of the valve element 2 (for example, fixed by bolts), and the first limiting plate 7 and the second limiting plate 8 interact with two ends of the valve body 1, so as to limit the valve element 2 from moving relative to the valve body 1 in the axial direction. The handle as the reversing mechanism 3 can be fixedly connected with the first limiting plate 7. The second restriction plate 8 may have an intake hole corresponding to the intake port 25 of the spool 2. Other specific forms are not described in detail herein.

As for the material of the valve core 2 and the valve body 1, it may be metal, nonmetal, or a combination of metal and nonmetal.

In addition, a bracket can be further included, and the bracket is connected with the valve body 1. The support can support or fix the valve body 1, and the support can enhance the stability of the valve body 1 and facilitate reversing operation. The specific form of the bracket is not limited, and the bracket can be a fixed bracket, a movable bracket or a foldable bracket. The support and the valve body 1 can be fixedly connected, detachably connected or rotatably connected. And will not be described in detail herein.

In a second aspect, an embodiment of the present invention provides a chain tensioner. FIG. 7 is a schematic structural diagram of an embodiment of the chain tensioner of the present invention; fig. 8 shows a schematic view of the connection of the first hook body to an embodiment of the swivel connection in an embodiment of the invention. Referring to fig. 1 to 8, the chain tightening device includes a driving mechanism 600, a rack sleeve 700, a rack 800 and a first hook 900, the rack sleeve 700 is fixedly connected to the driving mechanism 600, the rack 800 is assembled in the rack sleeve 700, the rack 800 is in transmission connection with the driving mechanism 600, the driving mechanism 600 drives the rack 800 to slide along the rack sleeve 700, the rack 800 is connected to the first hook 900, the rack sleeve 700 is connected to a fixing member 400, the driving mechanism 600 includes a speed reducer 610 and a pneumatic motor 620, the pneumatic motor 620 is in transmission connection with the speed reducer 610, the speed reducer 610 is in transmission connection with the rack 800, a first air hole 621 of the pneumatic motor 620 is connected to a reversing valve through a first air pipe 5, a second air hole 622 of the pneumatic motor 620 is connected to the reversing valve through a second air pipe 6, and the reversing valve is connected to a compressed air source.

In the prior art, compressed air needs to be inserted into the first air hole 621 through an air pipe for positive output, and enters from the first air hole 621 and is discharged from the second air hole 622; when the direction needs to be changed, the air pipe needs to be pulled out from the first air hole 621 and then inserted into the second air hole 622, and compressed air enters from the second air hole 622, is discharged from the first air hole 621 and is reversely output. Not only is complicated, but also is inconvenient to operate, even cannot be operated under certain conditions, or has danger. In the chain tightening device provided by the embodiment of the invention, the pneumatic motor 620 is connected with the reversing valve, so that positive and negative output can be realized without inserting and pulling an air pipe between the first air hole 621 and the second air hole 622 of the pneumatic motor 620, and the switching of tightening operation is realized.

In the embodiment of the present invention, the reversing valve may adopt any one of the reversing valves described above, and as shown in fig. 7, the first air vent 11 is connected to the first air hole 621 through the first air duct 5 (only the connection relationship is schematically expressed), and the third air vent 13 is connected to the second air hole 622 through the second air duct 6 (only the connection relationship is schematically expressed).

In another embodiment of the present invention, the first hook 900 is rotatably coupled to the rack 800 by a rotary coupling mechanism. In this embodiment, the first hook 900 can rotate relative to the rack 800, and when the object connected to the first hook is inclined, the chain tensioner is prevented from receiving a twisting force.

In the embodiment of the present invention, the first hook 900 and the rack 800 may rotate relatively in a certain direction, or may rotate relatively in multiple directions. For example, fig. 8 is a schematic view of the connection between the first hook 900 and an embodiment of the rotating connection mechanism according to the present invention. Referring to fig. 8, the rotation axis of the first hook 900 with respect to the rack 800 is parallel to the rack 800. The rack 800 is a long strip-shaped object, and thus parallel to the rack 800 means parallel to a straight line extending along the length direction of the rack 800. This embodiment makes it possible to avoid the chain tensioner from being twisted due to the inclination of the object (e.g., the blade) connected to the chain tensioner.

The specific structure of the rotating connection mechanism in the embodiment of the present invention is not limited, and for example, as shown in fig. 8, the first hook 900 may be rotated along a fixed axis with respect to the rack 800, or the rotating connection mechanism may be a universal connector. The first hook 900 may be rotated in a plurality of directions with respect to the rack 800.

The prior art can be adopted for the parts which are not described in the embodiment of the invention. For example, the fixing member 400 of the rack housing 700 may be a second hook, and the first hook 900 and the second hook as the fixing member 400 are used as a connecting mechanism on both sides of the chain fastening device. The reducer may be single shaft output or, as shown, dual shaft output. The chain tightening device of the embodiment of the invention can adopt an air compressor as a compressed air source.

In the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or order; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A diverter valve, comprising:

the valve body is cylindrical, and is provided with air vents communicated with the inside and the outside, wherein the air vents comprise a first air vent, a second air vent, a third air vent and a fourth air vent;

the valve core is cylindrical and is assembled in the valve body, a first air outlet hole and a second air outlet hole which are communicated with the inside and the outside are formed in the wall of the valve core, a first groove and a second groove are formed in the outer wall surface of the valve core, and an air inlet is formed in the valve core and is formed in the end surface of the valve core and communicated with the first air outlet hole and the second air outlet hole in the wall of the valve core and the outside;

when the valve core moves to a second position relative to the valve body, the second air outlet hole is opposite to the third air outlet hole, and the first groove is communicated with the first air outlet hole and the second air outlet hole;

at least the outer wall surface of the valve core, which is provided with a first groove and a second groove and a first air outlet hole and a second air outlet hole, is in sealing fit with the inner wall surface of the valve body, which is provided with an air vent;

the valve element is provided with a first vent hole, a second vent hole, a third vent hole, a fourth vent hole, a seal ring, a fourth vent hole, a seal ring, a fourth vent hole, a seal ring, a fourth vent hole, a seal ring, a fourth vent hole, a seal ring, a fourth vent hole, a seal ring, a fourth vent hole.

2. The reversing valve of claim 1, wherein a locating structure is provided between the valve spool and the valve body.

3. The reversing valve of claim 1, wherein the reversing mechanism is a handle that is removably coupled to the valve cartridge.

4. The reversing valve of claim 1, wherein the valve body comprises a cylinder body and an end cover, the cylinder body is provided with a connecting flange plate, and the end cover is connected with the flange plate through bolts.

5. The chain tightening device comprises a driving mechanism, a rack sleeve, a rack and a first hook body, wherein the rack sleeve is fixedly connected with the driving mechanism, the rack is assembled in the rack sleeve and is in transmission connection with the driving mechanism, the driving mechanism drives the rack to slide along the rack sleeve, the rack is connected with the first hook body, a fixing part is connected on the rack sleeve, the driving mechanism comprises a speed reducer and a pneumatic motor, the pneumatic motor is in transmission connection with the speed reducer, the speed reducer is in driving connection with the rack, a first air hole of the pneumatic motor is connected with a reversing valve through a first air pipe, a second air hole of the pneumatic motor is connected with the reversing valve through a second air pipe, and the reversing valve is connected with a compressed air source,

the reversing valve is as claimed in any one of claims 1 to 4, wherein the first vent is connected to the first air hole through a first air pipe, and the third vent is connected to the second air hole through a second air pipe.

6. The chain tensioner as claimed in claim 5, wherein the first hook is rotatably coupled to the rack by a rotating coupling mechanism.

7. The chain tensioner as claimed in claim 5, wherein the rotation axis of the first hook body relative to the rack is parallel to the rack.

8. The chain tensioner as in claim 6, wherein the rotating link is a universal joint.