A low-wear pneumatic knife

Abstract

The present invention discloses a low-wear pneumatic knife, comprising a cylinder body and a piston installed in the inner cavity of the cylinder body, the piston is fixedly connected with a blade through a knife rod, the piston divides the inner cavity of the cylinder body into a first chamber and a second chamber, the cylinder body is provided with an exhaust hole, comprising a first air inlet channel connected to the first chamber, a second air inlet channel connected to the second chamber, and an air valve core for controlling the alternating opening of the first air inlet channel and the second air inlet channel, the outer wall of the cylinder body is also provided with a lubrication component, the lubrication component comprises a storage chamber for storing grease, a first heat conduction plate group and a second heat conduction plate group for liquefying the grease, the cylinder body is provided with an air inlet hole and a spray hole connecting the inner cavity of the cylinder body with the storage chamber, a control valve group for controlling the opening or closing of the spray hole is provided inside the spray hole, and grease is sprayed into the cylinder body by the lubrication component to enhance the lubrication of the piston and the cylinder body and improve the service life of the pneumatic knife.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is a divisional application based on application number 2024101590264, filing date February 4, 2024, and invention name: A pneumatic knife. Technical Field

[0003] The invention relates to the technical field of vibrating knives, in particular to a low-wear pneumatic knife. Background Art

[0004] The vibrating knife uses the high-frequency vibration of the blade up and down, and uses CNC control to move it, with tens of thousands of vibrations per minute to achieve the cutting effect; it has a fast cutting speed and is suitable for cutting non-metallic flexible materials such as carbon fiber, fiber cotton, ceramic fiber, cloth, leather, felt, etc.

[0005] The vibrating knife introduced this time uses gas as power to achieve high-frequency up and down vibration of the blade. The existing utility model patent with authorization announcement number CN214937568U discloses a silent high-frequency pneumatic knife, which includes a knife head installed on a moving component, and uses gas as power to make the moving component move up and down reciprocatingly, including a cylinder and a piston moving at high speed in the cylinder. In the above scheme, the piston and the inner wall of the cylinder are not lubricated. After working for a long time, it is easy to cause wear of the inner wall of the cylinder and the outer wall of the piston, affecting the normal operation of the pneumatic knife.

[0006] Therefore, how to design a pneumatic knife that lubricates the piston and the cylinder has become a technical problem that needs to be solved urgently by people in this field. Summary of the invention

[0007] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a low-wear pneumatic knife to lubricate the piston and the cylinder to reduce the risk of wear on the inner wall of the piston or the cylinder.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A low-wear pneumatic knife comprises a cylinder body and a piston installed in the inner cavity of the cylinder body, the piston is fixedly connected to a blade via a knife rod, the piston divides the inner cavity of the cylinder body into a first chamber and a second chamber, an exhaust hole is provided on the cylinder body, comprising a first air inlet passage connected to the first chamber, a second air inlet passage connected to the second chamber, and an air valve core for controlling the alternating opening of the first air inlet passage and the second air inlet passage, a lubrication assembly is also provided on the outer wall of the cylinder body, the lubrication assembly comprises a storage chamber for storing grease, a first heat conducting plate group and a second heat conducting plate group for liquefying the grease, an air inlet hole and a spray hole connecting the inner cavity of the cylinder body with the storage chamber are provided on the cylinder body, a control valve group for controlling the opening or closing of the spray hole is provided inside the spray hole, the control valve group comprises a plugging head and a spring for pushing a portion of the plugging head into the inner cavity of the cylinder body, and the spray hole is opened when the plugging head abuts against the outer wall of the piston and retracts into the spray hole.

[0010] Furthermore, a second ring groove and a fourth ring groove are provided on the outer wall of the piston, and a first oil ring and a second oil ring are respectively installed in the second ring groove and the fourth ring groove, and the outer walls of the first oil ring and the second oil ring are both in contact with the inner wall of the cylinder body, and when the first oil ring is lower than the top wall of the exhaust hole, the first chamber is connected with the exhaust hole, and when the second oil ring is higher than the bottom wall of the exhaust hole, the second chamber is connected with the exhaust hole.

[0011] Furthermore, a plurality of oil supply channels are provided in the piston, and the plurality of oil supply channels are distributed along the circumference of the piston. The top end of the oil supply channel is connected to the outer wall of the piston to receive the grease sprayed from the spray hole, and the bottom end of the oil supply channel is connected to the fourth ring groove.

[0012] Furthermore, the top wall of the second oil ring is provided with a third oil guide groove for receiving grease dripping from the oil supply channel, the inner wall of the third oil guide groove is connected to the outer wall of the second oil ring and is provided with a plurality of second oil guide holes, and the plurality of second oil guide holes are evenly distributed along the circumference of the second oil ring.

[0013] Furthermore, the outer wall of the piston is provided with a first ring groove located below the second ring groove, a receiving ring is installed in the first ring groove, the first ring groove is connected to the top end of the oil supply channel, the top wall of the receiving ring is provided with a second oil guide groove inclined toward one side of the oil supply channel, and the bottom wall of the first oil ring is provided with a first push inclined surface for abutting against the sealing head. When the first push inclined surface abuts against the sealing head, the grease sprayed from the spray hole is sprayed into the second oil guide groove of the receiving ring.

[0014] Furthermore, the outer wall of the piston is provided with a third ring groove located on the upper side of the second ring groove, and a retaining ring is installed in the third ring groove. The top wall of the first oil ring is provided with a second push inclined surface for abutting against the sealing head. When the second push inclined surface abuts against the sealing head, the grease sprayed from the spray hole is sprayed to the bottom wall of the retaining ring.

[0015] Furthermore, a first oil guide groove is provided on the top wall of the first oil ring, and a plurality of first oil guide holes are provided on the inner wall of the first oil guide groove in communication with the side wall of the first oil ring. The plurality of first oil guide holes are evenly distributed along the circumference of the first oil ring.

[0016] Furthermore, the first heat conducting plate group includes a first heat conducting part and a second heat conducting part, the first heat conducting part and the second heat conducting part are bent into shape, the first heat conducting part is in contact with the outer wall of the cylinder body, the second heat conducting part is inclined, the storage chamber is located on the upper side of the second heat conducting part, and an adjusting chamber is provided on the lower side of the second heat conducting part, the bottom wall of the spray hole is provided with a reflux hole inclined downward and connected to the adjusting chamber, and a storage drawer is provided in the adjusting chamber and is located below the reflux hole for receiving grease.

[0017] Furthermore, the second heat conducting plate group includes a third heat conducting part and a fourth heat conducting part, wherein the third heat conducting part and the fourth heat conducting part are integrally formed, the third heat conducting part is in contact with the outer wall of the cylinder body, the fourth heat conducting part extends downwardly and obliquely into the storage cavity, and the grease abuts against the fourth heat conducting part.

[0018] Furthermore, the second heat conduction plate group also includes a guide part installed at the bottom end of the fourth heat conduction part. The top wall of the second heat conduction part is provided with a guide groove which is inclined and the bottom end of which points to the spray hole. The guide part is inclined, and the tangent of the bottom end of the guide part points to the guide groove. The air inlet is connected to the first chamber. The gas is blown toward the fourth heat conduction part through the air inlet and flows into the guide groove under the guidance of the guide part.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the present invention enables the piston to reciprocate in the inner cavity of the cylinder by alternately opening the first air inlet and the second air inlet, so that the blade can be driven to vibrate at high frequency through the knife rod, thereby realizing material cutting;

[0020] During the reciprocating movement of the piston, the temperature of the cylinder body liquefies the grease in the storage chamber through the first heating plate group and the second heating plate group. The abutment between the side wall of the piston and the sealing head opens the spray hole. At this time, the gas in the inner cavity of the cylinder body flows into the storage chamber through the air inlet hole, and sprays the liquid grease from the inside of the spray hole, and then sprays the liquid grease onto the side wall of the piston, which can achieve lubrication of the piston and the inner cavity of the cylinder body, reduce the risk of wear of the piston and the inner wall of the cylinder body, and increase the service life of the pneumatic knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a cross-sectional view of the present invention;

[0023] Figure 3 It is a partial cross-sectional view of the present invention;

[0024] Figure 4 It is a partial expanded view of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the housing of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the cylinder body of the present invention;

[0027] Figure 7 for Figure 6 Schematic diagram of the expansion;

[0028] Figure 8 It is the expansion schematic diagram of the cylinder body;

[0029] Fig. 9 is an expanded schematic diagram of the lubrication component;

[0030] Fig.10 is a cross-sectional view of a cylinder body of the present invention;

[0031] Fig.11 for Fig.10 Schematic diagram of the local structure;

[0032] Fig.12 for Fig.10 A is a schematic diagram of the enlarged structure of the middle part;

[0033] Fig.13 It is a schematic diagram of the local structure of the piston;

[0034] Fig.14 is a schematic diagram of the first state of the piston;

[0035] Fig.15 is a schematic diagram of the second oil ring;

[0036] Fig.16 is a structural schematic diagram of the piston in the second state;

[0037] Fig.17 This is a schematic diagram of the expansion of the control valve group.

[0038] In the figure: 1, housing; 101, adjustment hole; 102, observation window; 2, air valve group; 2011, first air inlet; 2012, second air inlet; 21, cylinder body; 201, first chamber; 202, second chamber; 2013, exhaust hole; 2014, installation notch; 20141, slot; 2015, air inlet; 2016, spray hole; 2017, return hole; 22, air valve core; 23, silencer shaft; 231, silencer plate; 232, ventilation gap; 24, silencer seat; 25, air intake shaft; 3, motion assembly; 31, knife bar; 32, nut; 33, blade; 301, knife bar sleeve; 302, guide seat; 303, bearing; 4, lubrication assembly; 401, storage chamber; 402, adjustment chamber; 403, countersunk hole; 41, back plate; 42, first heat conduction plate group; 421, first heat conduction part; 422, second heat conduction part; 4221, guide groove; 4222, Guide channel; 4223, sealing gasket; 43, second heat conduction plate group; 431, third heat conduction part; 432, fourth heat conduction part; 433, guide part; 44, baffle plate; 441, plug; 45, heat insulation plate; 46, baffle rod; 47, storage drawer; 48, push bolt; 5, piston; 501, first ring groove; 502, second ring groove; 503, third ring groove; 504, fourth ring groove; 505, oil supply channel; 51, first oil Ring; 511, first push inclined surface; 512, second push inclined surface; 513, first oil guide groove; 514, first oil guide hole; 52, retaining ring; 53, receiving ring; 531, second oil guide groove; 532, retaining edge; 54, second oil ring; 541, third oil guide groove; 542, second oil guide hole; 6, control valve group; 61, valve seat; 611, valve cavity; 612, guide sliding surface; 62, plugging head; 621, plugging cone; 63, spring. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] This embodiment provides a low-wear pneumatic knife, which lubricates the inner wall of the piston and the cylinder, reduces the risk of wear on the inner wall of the cylinder, and extends the service life of the pneumatic knife.

[0041] like Figure 2 and Figure 3As shown, the pneumatic knife includes a housing 1, an air valve group 2 installed inside the housing 1, a motion component 3 and a blade 33, wherein the air valve group 2 includes a cylinder 21 and a piston 5 slidably installed inside the cylinder 21, wherein the piston 5 separates the inner cavity of the cylinder 21 into a first chamber 201 and a second chamber 202, the air valve group 2 also includes a first air inlet 2011 communicating with the first chamber 201 and a second air inlet 2012 communicating with the second chamber 202, and also includes an air valve core 22, wherein the air valve core 22 is used to realize the alternating opening of the first air inlet 2011 and the second air inlet 2012, as shown in FIG. Figure 4 As shown, the motion component 3 includes a tool rod 31 and a nut 32, wherein the tool rod 31 passes through the end of the cylinder body 21 and extends into the piston 5, and the piston 5 and the tool rod 31 are fixedly connected by the nut 32 to achieve synchronous movement of the piston 5 and the tool rod 31, wherein the blade 33 is fixedly installed at one end of the tool rod 31 away from the nut 32.

[0042] Through the above arrangement, the external air source alternately enters the first chamber 201 and the second chamber 202 through the first air inlet 2011 and the second air inlet 2012, thereby driving the piston 5 to realize reciprocating movement in the inner cavity of the cylinder body 21, thereby driving the tool rod 31 and the blade 33 to vibrate at high frequency through the piston 5, thereby realizing material cutting.

[0043] It is worth noting here that the settings of the air valve core 22, the first air intake duct 2011 and the second air intake duct 2012 have been disclosed in the utility model patent with authorization announcement number CN214937568U, and the settings of the air valve core 22, the first air intake duct 2011 and the second air intake duct 2012 will not be repeated here.

[0044] When the knife rod 31 is in the process of reciprocating movement, in order to prevent the gas inside the second chamber 202 from leaking outward with the movement of the knife rod 31, in this embodiment, Figure 2 , Figure 3 and Figure 4 As shown, a bearing 303 is provided at one end of the cylinder body 21 close to the blade 33, wherein the outer wall of the knife rod 31 and the inner wall of the inner ring of the bearing 303 are slidably connected along the axial direction of the bearing 303. Specifically, the bearing 303 adopts an oil-free bearing to enhance the sealing performance of the knife rod 31 and the second chamber 202.

[0045] In order to improve the stability of the reciprocating movement of the knife bar 31, in this embodiment, Figure 2 and Figure 4As shown, a tool rod sleeve 301 and a guide seat 302 are installed in the inner cavity of the shell 1, wherein the end wall of the cylinder body 21 close to the blade 33 is in contact with the guide seat 302, the tool rod sleeve 301 is sleeved on the outside of the tool rod 31 and installed in the inner cavity of the guide seat 302, and the outer wall of the tool rod 31 and the inner wall of the tool rod sleeve 301 are connected to each other along the axial direction of the tool rod 31 to enhance the stability of the tool rod 31 during the reciprocating movement.

[0046] In order to facilitate the gas to enter the first air inlet 2011 or the second air inlet 2012, in this embodiment, Figure 2 , Figure 3 and Figure 4 As shown, the air valve group 2 also includes a muffler shaft 23 and an air intake shaft 25, wherein a channel connected to the first air intake duct 2011 is provided inside the muffler shaft 23, the muffler shaft 23 abuts against the end wall of the cylinder body 21 on the side away from the blade 33, and the air intake channel of the air intake shaft 25 is connected to the channel inside the muffler shaft 23 to enable the entry of an external air source.

[0047] In order to discharge the gas in the first chamber 201 and the second chamber 202 to the outside, in this embodiment, as shown in FIG. Figure 6 As shown, an exhaust hole 2013 communicating with the inner cavity of the cylinder body 21 is provided on the outer wall of the cylinder body 21 , wherein a gap for gas circulation is provided between the outer wall of the cylinder body 21 and the inner wall of the shell 1 .

[0048] Through the above arrangement, when the gas enters the first chamber 201 through the first air inlet 2011, the push piston 5 moves toward the second chamber 202. At this time, the first chamber 201 gradually becomes larger, and the second chamber 202 gradually becomes smaller. When the first chamber 201 is connected with the exhaust hole 2013, the gas in the first chamber 201 is discharged to the outside. At the same time, the air valve core 22 closes the first air inlet 2011 and opens the second air inlet 2012. At this time, the external gas enters the second chamber 202 through the second air inlet 2012. At this time, the piston 5 moves toward the side of the first chamber 201 and compresses the first chamber 201. When the second chamber 202 is connected to the exhaust hole 2013, the gas in the second chamber 202 is discharged outward through the exhaust hole 2013. At this time, the air valve core 22 reopens the first air inlet 2011 and closes the second air inlet 2012. The first air inlet 2011 and the second air inlet 2012 are alternately opened in the above manner, thereby realizing the reciprocating movement of the piston 5 and discharging the gas in the first chamber 201 and the second chamber 202.

[0049] In order to reduce the noise of the gas in the first chamber 201 and the second chamber 202 being discharged from the housing 1, in this embodiment, as shown in FIG. Figure 2 , Figure 3 and Figure 4As shown, the outer wall of the silencer shaft 23 is provided with a plurality of silencer plates 231 distributed axially along the silencer shaft 23, wherein the silencer plates 231 are provided with air-permeable notches 232, and the air-permeable notches 232 on two adjacent silencer plates 231 are staggered with each other, and the outer shell 1 is also provided with a silencer seat 24 for receiving the gas flowing through the air-permeable notches 232.

[0050] Through the above arrangement, the gas exhausted from the exhaust hole 2013 flows to the silencer plate 231, and gradually moves to the silencer seat 24 through the air-permeable notch 232. Then, after the noise reduction of the silencer seat 24, the gas is discharged outward from the silencer seat 24, thereby reducing the noise of the pneumatic vibrating knife when working.

[0051] It is worth mentioning here that the gas exhausted from the exhaust hole 2013 can push the gas valve core 22 to move to close the first air intake passage 2011 and open the second air intake passage 2012 at the same time.

[0052] In this embodiment, specifically, Figure 8 and Fig.10 As shown, the outer wall of the piston 5 is provided with a second annular groove 502 and a fourth annular groove 504, wherein the first oil ring 51 is buckled in the second annular groove 502, and the second oil ring 54 is buckled in the fourth annular groove 504, and the outer walls of the first oil ring 51 and the second oil ring 54 abut against the inner wall of the cylinder body 21. When the first oil ring 51 is lower than the top wall of the exhaust hole 2013, the first chamber 201 is connected to the exhaust hole 2013 to achieve exhaust of the first chamber 201. When the second oil ring 54 is higher than the bottom wall of the exhaust hole 2013, the second chamber 202 is connected to the exhaust hole 2013 to achieve exhaust of the second chamber 202. When the exhaust hole 2013 is located between the first oil ring 51 and the second oil ring 54, the first chamber 201 and the second chamber 202 are disconnected from the exhaust hole 2013.

[0053] In order to achieve lubrication between the piston 5 and the inner wall of the cylinder body 21, in this embodiment, as shown in FIG. Figure 3 , Figure 6 and Figure 7 As shown, the outer wall of the cylinder body 21 is provided with a mounting notch 2014 arranged along the axial direction, wherein a lubrication assembly 4 is installed at the mounting notch 2014 , and the lubrication assembly 4 is used to spray liquid grease between the piston 5 and the inner wall of the cylinder body 21 .

[0054] Through the above arrangement, after the lubrication component 4 sprays the grease onto the outer wall of the piston 5, as the piston 5 reciprocates, the first oil ring 51 and the second oil ring 54 scrape the grease and coat the grease on the inner wall of the cylinder body 21, thereby reducing the wear between the piston 5 and the inner wall of the cylinder body 21.

[0055] In order to achieve the storage of grease, in this embodiment, as Fig. 9 and Fig.11 As shown, the lubrication assembly 4 includes a back plate 41 and side plates located on both sides of the back plate 41, and a first heat conducting plate group 42 extending radially inward along the cylinder body 21 is provided in the middle position of the back plate 41, wherein the first heat conducting plate group 42 divides the chamber surrounded by the back plate 41, the side plate and the outer wall of the cylinder body 21 into two upper and lower chambers, wherein the upper chamber is a storage chamber 401, and the lower chamber is an adjusting chamber 402, wherein the interior of the storage chamber 401 is used to store solid grease.

[0056] Since the storage chamber 401 contains solid grease, when the pneumatic knife is working, in order to spray the grease onto the piston 5, in this embodiment, Fig. 9 and Fig.11 As shown, the lubrication assembly 4 also includes a second heat-conducting plate group 43 located in the storage cavity 401, wherein the second heat-conducting plate group 43 includes a third heat-conducting part 431 and a fourth heat-conducting part 432, wherein the third heat-conducting part 431 and the fourth heat-conducting part 432 are bent and formed as one body, the third heat-conducting part 431 abuts against the outer wall of the cylinder body 21, and the fourth heat-conducting part 432 extends toward the side close to the back plate 41 and is in an inclined state, and the solid grease is placed between the fourth heat-conducting part 432 and the back plate 41, and the cylinder body 21 is also provided with a spray hole 2016 that connects the inner cavity of the cylinder body 21 with the storage cavity 401, and the spray hole 2016 is also provided with a control valve group 6 for controlling the opening and closing of the spray hole 2016.

[0057] Through the above arrangement, as the piston 5 reciprocates, the first oil ring 51 and the second oil ring 54 rub against the inner wall of the cylinder body 21, thereby causing the temperature of the cylinder body 21 to rise. At this time, the high temperature of the cylinder body 21 is transmitted to the fourth heat conducting part 432 through the third heat conducting part 431, and the solid grease in contact with the fourth heat conducting part 432 gradually liquefies due to the increase in temperature and drips onto the first heat conducting plate group 42. After the control valve group 6 opens the spray hole 2016, the liquid grease flows into the inner cavity of the cylinder body 21 through the spray hole 2016, and then flows to the piston 5, thereby achieving the purpose of lubricating the piston 5 and the inner wall of the cylinder body 21.

[0058] Specifically, in this embodiment, if Fig. 9 and Fig.11 As shown, an upwardly extending baffle plate 44 is fixedly provided at the connection position between the third heat conducting part 431 and the fourth heat conducting part 432, wherein a gap is left between the baffle plate 44 and the outer wall of the cylinder body 21, and a heat insulating plate 45 is fixedly provided on the bottom wall of the baffle plate 44, wherein the heat insulating plate 45 is installed between the baffle plate 44 and the second heat conducting plate group 43. At this time, the longitudinal section of the storage cavity 401 is a right-angled trapezoid, and the fourth heat conducting part 432 is the inclined surface of the right-angled trapezoid, and only the fourth heat conducting part 432 is used to heat the solid grease to reduce the speed of liquefaction of the solid grease.

[0059] It is worth noting that the gaps between the heat insulating plate 45 and the blocking plate 44 and the outer wall of the cylinder body 21 can prevent the heat of the cylinder body 21 from being transferred to the solid grease, thereby reducing the liquefaction speed of the solid grease.

[0060] Specifically, Fig.11 As shown, a gap is left between the bottom of the fourth heat-conducting part 432 and the back plate 41 for liquid grease to drip onto the first heat-conducting plate group 42, and a plurality of blocking rods 46 are laid flat inside the gap. The blocking rods 46 can prevent the solid grease inside the storage cavity 401 from falling directly downward.

[0061] When the liquid grease drips onto the first heat conducting plate group 42, in order to prevent the liquid grease from solidifying on the first heat conducting plate group 42 and to accurately guide the liquid grease to the spray hole 2016, in this embodiment, Fig. 9 and Fig.11 As shown, the first heat-conducting plate group 42 includes a first heat-conducting portion 421 and a second heat-conducting portion 422, wherein the first heat-conducting portion 421 and the second heat-conducting portion 422 are bent and formed into one piece, the first heat-conducting portion 421 is vertically arranged and attached to the outer wall of the cylinder body 21, the first heat-conducting portion 421 is used to conduct the heat of the cylinder body 21 to the second heat-conducting portion 422, and the second heat-conducting portion 422 is used to continuously heat the liquid grease, thereby solving the problem of the liquid grease solidification; wherein the second heat-conducting portion 422 is inclined, and the lower part of the second heat-conducting portion 422 is The end is close to one side of the cylinder body 21, the second heat conducting part 422 is provided with a guide groove 4221 pointing to the spray hole 2016, and the cylinder body 21 is provided with an air inlet hole 2015 connecting the inner cavity of the cylinder body 21 with the storage cavity 401, wherein the air inlet hole 2015 and the solid grease are respectively located on both sides of the fourth heat conducting part 432 to prevent the grease from clogging the air inlet hole 2015, and the second heat conducting plate group 43 also includes a guide part 433, wherein the guide part 433 is installed at the bottom of the fourth heat conducting part 432, and the end of the guide part 433 points to the second heat conducting part 422.

[0062] Through the above arrangement, the liquefied grease at the storage chamber 401 position drips into the guide groove 4221 of the second heat conducting part 422, and flows downward along the guide groove 4221. At this time, the gas in the inner cavity of the cylinder body 21 enters the storage chamber 401 through the air inlet hole 2015 and blows to the fourth heat conducting part 432. Then, under the action of the guide part 433, the wind is reversed and blown onto the second heat conducting part 422. The wind is tangent to the surface of the second heat conducting part 422, and the liquid grease inside the guide groove 4221 is blown to the spray hole 2016. Then, the liquid grease is sprayed from the spray hole 2016 to the piston 5 to achieve the lubrication purpose.

[0063] Specifically, in order to open or close the spray hole 2016, in this embodiment, Fig.12 and Fig.17 As shown, the inner wall of the spray hole 2016 close to the inner cavity of the cylinder body 21 is conical; the control valve group 6 includes a valve seat 61, a spring 63 and a plugging head 62, wherein a gap for grease to be sprayed out is reserved between the outer wall of the valve seat 61 and the inner wall of the spray hole 2016, the valve seat 61 is fixedly mounted on the inner wall of the spray hole 2016, a valve cavity 611 is arranged inside the valve seat 61, the side wall of the plugging head 62 is slidably connected to the inner wall of the valve cavity 611, and the spring 63 is mounted in the valve cavity 611, wherein one end of the spring 63 is in contact with the valve cavity The inner wall of the valve cavity 611 is fixedly connected, and the other end of the spring 63 is fixedly connected to the end wall of the plugging head 62. One end of the plugging head 62 is located on the outside of the valve cavity 611 and extends into the inner cavity of the cylinder body 21. A plugging cone 621 is provided at the end of the plugging head 62. When the plugging cone 621 abuts against the cone surface in the spray hole 2016, the spray hole 2016 is closed. When the plugging head 62 is pushed into the inside of the spray hole 2016, the plugging cone 621 is disengaged from the cone surface of the spray hole 2016, and the spray hole 2016 is opened.

[0064] Specifically, in this embodiment, the air inlet 2015 is connected to the first chamber 201. Fig.14 As shown, when the first air inlet 2011 takes air into the first chamber 201, the piston 5 is pushed downward. At this time, the air pressure inside the first chamber 201 is greater than the air pressure inside the second chamber 202. The gas inside the first chamber 201 enters the storage chamber 401 through the air inlet hole 2015. As the piston 5 moves downward, the first oil ring 51 is driven to move downward. At this time, the first oil ring 51 pushes the sealing head 62 to move toward the inside of the spray hole 2016 and compresses the spring 63. At this time, the spray hole 2016 is opened, and the gas inside the storage chamber 401 blows the second heat conduction The liquid grease on the portion 422 is sprayed from the inside of the spray hole 2016 to the piston 5 to lubricate the piston 5. The piston 5 continues to move downward. At this time, the first oil ring 51 releases the push on the plugging head 62. The plugging head 62 closes the spray hole 2016 again under the action of the spring 63. The first oil ring 51 is lower than the top wall of the exhaust hole 2013. At this time, the first chamber 201 is connected to the exhaust hole 2013 to discharge the gas inside the first chamber 201 to the outside. At this time, the air valve core 22 closes the first air inlet 2011 and opens the second air inlet 2012. Fig.16As shown, at this time, the gas in the second intake duct 2012 enters into the second chamber 202, thereby pushing the piston 5 to move upward. At this time, when the first oil ring 51 moves upward, the gas in the first chamber 201 is compressed, and a part of the gas enters into the storage chamber 401 through the intake hole 2015. When the first oil ring 51 moves upward, the spray hole 2016 is opened and closed again to realize the spraying of one side of the grease. When the second oil ring 54 is higher than the bottom wall of the exhaust hole 2013, at this time, the gas in the second chamber 202 is discharged outward, and the above-mentioned action is repeated. While the piston 5 moves back and forth, the first oil ring 51 is used to control the position of the sealing head 62, thereby realizing the opening and closing of the spray hole 2016, thereby controlling the grease inside the storage chamber 401 to spray outward.

[0065] Among them, Fig.17 As shown, the valve seat 61 is provided with an arc-shaped guide surface 612 at one end close to the storage chamber 401, which facilitates blowing the liquid grease in the guide groove 4221 into the spray hole 2016. The guide surface 612 is used to guide the liquid grease to the inner cavity side of the cylinder body 21, thereby reducing the risk of grease adhering to the valve seat 61.

[0066] In order to achieve the installation of the first heat conducting plate group 42 and prevent the liquid grease at the second heat conducting portion 422 from flowing into the gap between the first heat conducting portion 421 and the cylinder body 21, in this embodiment, Fig. 9 and Fig.11 As shown, the back plate 41 is provided with a countersunk hole 403 recessed toward one side of the cylinder body 21, and the countersunk hole 403 is internally threadedly connected with a push bolt 48 extending toward the inside of the adjustment chamber 402, wherein the push bolt 48 is threadedly connected to the back plate 41, and the first heat conducting plate group 42 further includes a sealing gasket 4223, wherein the sealing gasket 4223 is clamped between the first heat conducting portion 421 and the outer wall of the cylinder body 21, as shown in FIG. Figure 1 and Figure 5 As shown, an adjustment hole 101 is provided on the housing 1. After the cylinder body 21 is installed in the inner cavity of the housing 1, the adjustment hole 101 is aligned with the countersunk hole 403. The position of the push bolt 48 can be adjusted without disassembling the pneumatic knife, thereby adjusting the fit between the first heat conducting part 421 and the cylinder body 21 to prevent liquid grease from flowing between the cylinder body 21 and the first heat conducting part 421.

[0067] In order to be able to observe the remaining amount of grease in the storage chamber 401, in this embodiment, Figure 3 and Figure 5 As shown, an observation window 102 is provided on the side wall of the housing 1, and the back plate 41 is made of a transparent material, so that the remaining amount of grease can be observed in real time through the observation window 102, and the grease can be replenished in time.

[0068] In order to achieve the fixation of the lubrication assembly 4 and the cylinder body 21, in this embodiment, as shown in FIG. Figure 7 and Fig. 9 As shown, the installation notch 2014 is provided with a slot 20141 arranged axially along the cylinder body 21, and a plug 441 is fixedly provided on the blocking plate 44. When the lubrication component 4 is installed, the plug 441 is aligned with the slot 20141, and then the lubrication component 4 is moved from top to bottom to insert the plug 441 into the slot 20141.

[0069] After the pneumatic knife stops working, the temperature of the cylinder 21 gradually decreases. At this time, the liquid grease is easy to accumulate inside the spray hole 2016, causing the spray hole 2016 to be blocked. Therefore, in this embodiment, Fig.11 and Fig.12 As shown, the bottom wall of the spray hole 2016 is provided with a reflux hole 2017 extending obliquely downward, wherein the lower end of the reflux hole 2017 points to the regulating chamber 402, and the first heat conducting part 421 is provided with a guide channel 4222 aligned with the reflux hole 2017, and the regulating chamber 402 is also provided with a storage drawer 47 located below the guide channel 4222 for receiving grease.

[0070] Through the above arrangement, when the pneumatic knife stops working, the piston 5 stops moving, and the cylinder body 21 still has residual temperature. The liquid grease inside the spray hole 2016 flows vertically downward along the inner wall to the reflux hole 2017, and flows along the reflux hole 2017 and the guide channel 4222 to the inside of the storage drawer 47, thereby absorbing excess grease and preventing the grease from solidifying inside the spray hole 2016 and causing the spray hole 2016 to be blocked.

[0071] Since the plugging head 62 can only move under the thrust of the first oil ring 51, the grease sprayed from the spray hole 2016 will be concentrated at the position of the first oil ring 51, which may easily lead to the wear of the cylinder body 21 due to lack of grease at the position of the second oil ring 54. Therefore, in this embodiment, Fig.11 and Fig.15 As shown, the piston 5 is provided with a plurality of oil supply channels 505 arranged along the axial direction of the piston 5, wherein the top of the oil supply channel 505 is connected to the outer wall of the piston 5, and the bottom of the oil supply channel 505 is connected to the fourth annular groove 504, wherein the plurality of oil supply channels 505 are evenly distributed along the circumference of the piston 5.

[0072] Through the above arrangement, when the liquid grease sprayed from the spray hole 2016 is sprayed onto the outer wall of the piston 5, due to the high temperature of the piston 5, the liquid grease flows into the fourth ring groove 504 through the oil supply channel 505 under the action of its own gravity, thereby infiltrating the second oil ring 54. Through the second oil ring 54, the liquid grease inside the oil supply channel 505 is coated on the inner wall of the cylinder body 21, thereby achieving lubrication of the lower part of the piston 5.

[0073] In this embodiment, if Fig.15 As shown, the second oil ring 54 is provided with a third oil guide groove 541 for receiving liquid grease in the oil supply channel 505, and the inner wall of the third oil guide groove 541 is connected to the outer wall of the second oil ring 54 and is provided with a second oil guide hole 542, wherein a plurality of second oil guide holes 542 are provided and are evenly distributed along the circumference of the piston 5, so that the liquid grease can be distributed to any position of the second oil ring 54.

[0074] Through the above arrangement, the grease falling from the oil supply channel 505 is carried into the third oil guide groove 541, and then flows to the outside of the second oil ring 54 through the second oil guide hole 542, so that the grease is evenly distributed on the outside of the second oil ring 54, thereby realizing the lubrication of the lower part of the piston 5.

[0075] Since the end of the plugging head 62 is conical and has a plugging cone 621, when the spray hole 2016 is opened, the sprayed liquid grease cannot be accurately sprayed into the oil supply channel 505. Fig.13 and Fig.14 As shown, the outer wall of the piston 5 is provided with a first annular groove 501 located below the second annular groove 502, wherein the first annular groove 501 is buckled with a receiving ring 53, wherein the top of the oil supply channel 505 is connected to the first annular groove 501, and the receiving ring 53 is provided with a second annular oil guide groove 531 to guide the received grease to the oil supply channel 505, and the first oil ring 51 is provided with a first push bevel 511 and a second push bevel 512, wherein the first push bevel 511 is located below the second push bevel 512, the first push bevel 511 is located on the bottom wall of the first oil ring 51, and the second push bevel 512 is located on the top wall of the first oil ring 51, and the outer diameter of the receiving ring 53 is smaller than the outer diameter of the first oil ring 51, and when the piston 5 moves up and down, the receiving ring 53 cannot contact the sealing head 62.

[0076] With the above settings, Fig.14 As shown, when the piston 5 moves downward, the first pushing inclined surface 511 on the first oil ring 51 abuts against the sealing cone surface 621 of the sealing head 62, thereby pushing the sealing head 62 toward the inside of the spray hole 2016 and compressing the spring 63. At this time, the spray hole 2016 is opened, and the liquid grease sprayed from the spray hole 2016 is adsorbed to the bottom wall of the first oil ring 51, and then the grease drips into the second oil guide groove 531 of the receiving ring 53 under the action of its own gravity, and then the lubricant is gathered toward the inside of the oil supply channel 505.

[0077] In order to prevent the excessive grease on the receiving ring 53 from falling to the outside of the receiving ring 53, in this embodiment, Fig.13 As shown, the top wall of the receiving ring 53 is also provided with a rib 532 extending vertically upward, and the rib 532 can prevent the grease from flowing out.

[0078] When the piston 5 moves upward, Fig.13 and Fig.16 As shown, at this time, the second pushing inclined surface 512 on the first oil ring 51 abuts against the blocking conical surface 621 of the plugging head 62, and then the plugging head 62 is pushed toward the inside of the spray hole 2016 to open the spray hole 2016. At this time, the grease inside the spray hole 2016 will be sprayed out obliquely upward. Since the frequency of the reciprocating movement of the piston 5 is relatively fast, the sprayed grease is not easy to fall onto the first oil ring 51, resulting in poor lubrication effect on the inner wall of the cylinder body 21. Therefore, a third annular groove 503 located on the upper side of the second annular groove 502 is provided on the outer wall of the piston 5, wherein a retaining ring 52 is engaged in the third annular groove 503. When the second pushing inclined surface 512 abuts against the plugging head 62 to open the spray hole 2016, the grease is sprayed onto the bottom wall of the retaining ring 52 to prevent the grease from continuously splashing upward. At this time, the grease on the retaining ring 52 drips downward onto the first oil ring 51, which is convenient for lubricating the inner wall of the cylinder body 21.

[0079] In order to improve the lubrication effect of the first oil ring 51 on the inner wall of the cylinder body 21, in this embodiment, Fig.13 As shown, the top wall of the first oil ring 51 is provided with a first oil guide groove 513 which is recessed downward, the bottom wall of the first oil guide groove 513 is inclined, and the lower side of the bottom wall of the first oil guide groove 513 is located on the outside of the first oil ring 51, and the inner wall of the first oil guide groove 513 is provided with a first oil guide hole 514 which is connected with the outer wall of the first oil ring 51, and a plurality of first oil guide holes 514 are provided and are evenly distributed along the circumference of the piston 5.

[0080] Through the above arrangement, the grease dripping from the retaining ring 52 into the first oil guide groove 513 flows toward the side close to the inner wall of the cylinder body 21, and flows from the first oil guide hole 514 to the side wall of the first oil ring 51, so that the grease is evenly applied to the inner wall of the cylinder body 21, thereby enhancing the lubrication of the piston 5 and the cylinder body 21 and reducing the wear of the piston 5 and the cylinder body 21.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A low-wear pneumatic knife, comprising a cylinder (21) and a piston (5) installed in the inner cavity of the cylinder (21), wherein the piston (5) divides the inner cavity of the cylinder (21) into a first chamber (201) and a second chamber (202), and the cylinder (21) is provided with an exhaust hole (2013), comprising a first air inlet (2011) communicating with the first chamber (201), a second air inlet (2012) communicating with the second chamber (202), and a valve core (22) for controlling the first air inlet (2011) and the second air inlet (2012) to be opened alternately, characterized in that: The outer wall of the cylinder body (21) is also provided with a lubricating assembly (4), the lubricating assembly (4) comprising a storage cavity (401) for storing lubricating grease, a first heat conducting plate group (42) and a second heat conducting plate group (43) for liquefying the lubricating grease, the first heat conducting plate group (42) comprising a first heat conducting portion (421) and a second heat conducting portion (422) formed by bending, the first heat conducting portion (421) being in contact with the outer wall of the cylinder body (21), the second heat conducting portion (422) being arranged at an angle, and the storage cavity (401) being located at the second heat conducting portion (422). The upper side of the second heat conducting part (422) is provided with an adjusting chamber (402), and the bottom wall of the spray hole (2016) is provided with a reflux hole (2017) which is inclined downward and communicated with the adjusting chamber (402); the second heat conducting plate group (43) includes an integrally formed third heat conducting part (431) and a fourth heat conducting part (432), the third heat conducting part (431) is in contact with the outer wall of the cylinder body (21), and the fourth heat conducting part (432) is inclined downward and extends toward the inside of the storage chamber (401), and the grease is in contact with the fourth heat conducting part (432); the cylinder body (21) is provided with a plurality of heat conducting parts (431, 432 ... The body (21) is provided with an air inlet (2015) and a spray hole (2016) for connecting the inner cavity of the cylinder body (21) with the storage cavity (401); a control valve group (6) for controlling the opening or closing of the spray hole (2016) is provided inside the spray hole (216); the control valve group (6) comprises a plugging head (62) and a spring (63) for pushing a portion of the plugging head (62) into the inner cavity of the cylinder body (21); when the plugging head (62) abuts against the outer wall of the piston (5) and retracts into the spray hole (2016), the spray hole (2016) is opened; and the piston (5) is provided with a control valve group (6) for controlling the opening or closing of the spray hole (2016). A second annular groove (502) and a fourth annular groove (504) are provided on the outer wall of the cylinder (5); a first oil ring (51) and a second oil ring (54) are respectively installed in the second annular groove (502) and the fourth annular groove (504) to abut against the inner wall of the cylinder body (21); when the first oil ring (51) is lower than the top wall of the exhaust hole (2013), the first chamber (201) is connected to the exhaust hole (2013); when the second oil ring (54) is higher than the bottom wall of the exhaust hole (2013), the second chamber (202) is connected to the exhaust hole (2013).

2. A low-wear pneumatic knife according to claim 1, characterized in that: A plurality of oil supply channels (505) are provided in the piston (5), and the plurality of oil supply channels (505) are distributed along the circumference of the piston (5). The top end of the oil supply channel (505) is connected to the outer wall of the piston (5) to receive the grease sprayed from the spray hole (2016), and the bottom end of the oil supply channel (505) is connected to the fourth annular groove (504).

3. A low-wear pneumatic knife according to claim 2, characterized in that: The top wall of the second oil ring (54) is provided with a third oil guide groove (541) for receiving grease dripping from the oil supply channel (505); the inner wall of the third oil guide groove (541) is connected to the outer wall of the second oil ring (54) and is provided with a plurality of second oil guide holes (542); the plurality of second oil guide holes (542) are evenly distributed along the circumference of the second oil ring (54).

4. A low-wear pneumatic knife according to claim 2, characterized in that: The outer wall of the piston (5) is provided with a first annular groove (501) located below the second annular groove (502), a receiving ring (53) is installed in the first annular groove (501), the first annular groove (501) is communicated with the top end of the oil supply channel (505), the top wall of the receiving ring (53) is provided with a second oil guide groove (531) inclined toward one side of the oil supply channel (505), and the bottom wall of the first oil ring (51) is provided with a first push inclined surface (511) for abutting against the plugging head (62). When the first push inclined surface (511) abuts against the plugging head (62), the grease sprayed from the spray hole (2016) is sprayed into the second oil guide groove (531) of the receiving ring (53).

5. A low-wear pneumatic knife according to claim 2, 3 or 4, characterized in that: The outer wall of the piston (5) is provided with a third ring groove (503) located on the upper side of the second ring groove (502), and a retaining ring (52) is installed in the third ring groove (503). The top wall of the first oil ring (51) is provided with a second push inclined surface (512) for abutting against the sealing head (62). When the second push inclined surface (512) abuts against the sealing head (62), the grease sprayed from the spray hole (2016) is sprayed onto the bottom wall of the retaining ring (52).

6. A low-wear pneumatic knife according to claim 5, characterized in that: A first oil guide groove (513) is provided on the top wall of the first oil ring (51), and a plurality of first oil guide holes (514) are provided on the inner wall of the first oil guide groove (513) in communication with the side wall of the first oil ring (51), wherein the plurality of first oil guide holes (514) are evenly distributed along the circumference of the first oil ring (51).

7. The low-wear pneumatic knife according to claim 1, characterized in that: The second heat conducting plate group (43) further comprises a flow guide portion (433) mounted at the bottom end of the fourth heat conducting portion (432); the top wall of the second heat conducting portion (422) is provided with a flow guide groove (4221) which is arranged obliquely and whose bottom end points to the spray hole (2016); the flow guide portion (433) is arranged obliquely, and a tangent line at the bottom end of the flow guide portion (433) points to the flow guide groove (4221); the air inlet hole (2015) is connected to the first chamber (201); the gas is blown toward the fourth heat conducting portion (432) through the air inlet hole (2015) and flows toward the flow guide groove (4221) under the guidance of the flow guide portion (433).

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