Laser cutting machine for dining chair pipe machining

Abstract

The laser cutting machine for dining chair pipe machining comprises a base and an oil storage tank fixedly arranged at the top of the base, a positioning mechanism used for fixing a raw material pipe is arranged on one side of the oil storage tank, and a mounting plate is fixedly arranged on the portion, on the rear side of the oil storage tank, of the base; a polishing mechanism used for removing burrs at the ends of the raw material pipes is arranged on the front face of the mounting plate. In the extending process of the extending end of the second air cylinder, the polishing tool polishes the cut positions of the cut pipe and the raw material pipe at the same time so as to remove an oxide layer, when the extending end of the second air cylinder extends to the longest, the polishing tool completes polishing, a piston blocks the input end of a first oil spraying pipe, the extending end of the first air cylinder is controlled to extend to the longest, and the polishing tool completes polishing; and the rubber block drives the cut pipe to get close to the raw material pipe, so that grinding oil sprayed out of the second oil spraying pipe is conveniently, comprehensively and efficiently smeared to the cutting position of the cut pipe and the raw material pipe, and subsequent normal welding of the two ends of the dining chair pipe is prevented from being affected.

Description

Technical Field

[0001] The invention relates to the technical field of tube processing, in particular to a laser cutting machine for processing dining chair tubes. Background Art

[0002] Dining chair tubes are one of the key materials for making dining chairs. Their quality and characteristics directly affect the comfort, durability and safety of dining chairs. Most of the dining chair tubes are square tubes. During the processing, the raw tubes need to be cut into the required lengths by a laser cutting machine.

[0003] In the process of cutting raw pipes with existing laser cutting machines, the influence of blowing nitrogen not only reduces the oxygen content around the laser cutting machine, but also causes the generated sparks to spread, which is easy to affect the surrounding users and equipment; at the same time, since both ends of the dining chair pipe need to be welded, after the cutting operation is completed, only the cut part of the cut pipe is polished to remove the oxide layer, while the cut part of the raw pipe is not polished, affecting the subsequent normal welding of the two ends of the dining chair pipe. Summary of the invention

[0004] The technical problems solved by this solution are:

[0005] (1) How to solve the problem that both ends of the dining chair tube need to be welded, but after the cutting operation is completed, only the cut part of the cut tube is polished, and the cut part of the raw tube is not polished, which affects the subsequent normal welding of the two ends of the dining chair tube;

[0006] (2) How to solve the problem that the blowing of nitrogen not only reduces the oxygen content around the laser cutting machine, but also causes the generated sparks to spread, which is likely to affect the surrounding users and equipment.

[0007] The object of the present invention can be achieved by the following technical scheme: A laser cutting machine for processing dining chair pipes, comprising a base and an oil storage tank fixedly arranged on the top thereof, a positioning mechanism for fixing the raw material pipe is arranged on one side of the oil storage tank, and a mounting plate is fixedly arranged on the base at the rear side of the oil storage tank, and a grinding mechanism for removing burrs at the end of the raw material pipe is arranged on the front side of the mounting plate;

[0008] The positioning mechanism includes a support platform fixedly connected to the base, a guide groove for placing raw material pipes is provided on the top of the support platform, a plurality of transmission rollers for moving the raw material pipes are rotatably arranged at the bottom of the inner wall of the guide groove, and an auxiliary pressing unit for preventing the raw material pipes from shaking is also arranged inside the guide groove.

[0009] A further technical improvement of the present invention is that a first cylinder arranged laterally is fixedly installed on the mounting plate, a lever is fixedly installed on the protruding end of the first cylinder, and an L-shaped flip plate is rotatably arranged on the mounting plate on one side of the first cylinder through a pin shaft, and one end of the L-shaped flip plate is movably connected to the lever.

[0010] A further technical improvement of the present invention is that a rubber block for positioning the raw material pipe is fixedly installed on the other end of the L-shaped flip plate, and the rubber block is located inside the guide groove.

[0011] A further technical improvement of the present invention is that the auxiliary pressing unit includes a first guide plate fixedly connected to the top of the support platform, a lifting rod is movably inserted in the middle of the first guide plate, a baffle is fixedly installed in the middle and upper part of the lifting rod, and a thrust spring is elastically arranged between the baffle and the first guide plate.

[0012] A further technical improvement of the present invention is that a roller is rotatably provided on the top of the lifting rod, the position of the roller corresponds to the position of the L-shaped flip plate, and a rubber plate is fixedly installed on the bottom end of the lifting rod, the position of the rubber plate corresponds to the position of the raw material pipe.

[0013] A further technical improvement of the present invention is that a second guide plate is fixedly installed on the inner wall of the guide groove below the first guide plate, and the middle part of the lifting rod movably passes through the second guide plate; by controlling the extension of the protruding end of the second cylinder, the grinding tool simultaneously grinds the cut pipe and the cut part of the raw pipe to remove the oxide layer. When the protruding end of the second cylinder is extended to the longest, the grinding tool completes the grinding, and the piston blocks the input end of the first fuel injection pipe. At this time, the protruding end of the first cylinder is controlled to extend to the longest, so that the rubber block drives the cut pipe close to the raw pipe, so that the grinding oil sprayed from the second fuel injection pipe is comprehensively and efficiently applied to the cut pipe and the cut part of the raw pipe to protect them and prevent oxidation from occurring again, so as to avoid affecting the subsequent normal welding of the two ends of the processed dining chair pipe.

[0014] A further technical improvement of the present invention is that the grinding mechanism includes a turning frame rotatably connected to the top of the oil storage tank through a rotating seat, a grinding tool is fixedly arranged on the top of the turning frame, the grinding tool is a prior art, and the output end position of the grinding tool corresponds to the cutting position of the raw material pipe, a second cylinder arranged longitudinally is fixedly installed on the mounting plate, a fixing pin is fixedly connected to the protruding end of the second cylinder, and one end of the fixing pin is movably connected to the side of the turning frame.

[0015] A further technical improvement of the present invention is that an oil injection cylinder is fixedly installed on the inner wall of the oil storage tank, the bottom of the side of the oil injection cylinder is connected to a first oil injection pipe, the output end of the first oil injection pipe is arranged toward the rear side of the inner wall of the oil storage tank, and the top of the side of the oil injection cylinder is connected to a second oil injection pipe, the output end of the second oil injection pipe is toward the cutting point of the raw material pipe.

[0016] A further technical improvement of the present invention is that: the extended end of the second cylinder is also fixedly connected with a connecting rod, the bottom end of the connecting rod movably penetrates the oil injection cylinder and is fixedly connected with a piston, an oil pump is fixedly arranged on the base, the input end of the oil pump is connected with the bottom of the oil storage tank through an oil inlet pipe, and the output end of the oil pump is connected with an oil outlet pipe, and the oil outlet pipe is connected with the middle part of the oil injection cylinder; in the process of cutting the raw material pipe by the laser cutting tool, the air supply tool is turned on, and the blown nitrogen is used to reduce the oxygen content around the raw material pipe, and the generated diffused sparks are shielded and collected by the grinding oil in the oil storage tank to prevent the surrounding users and equipment from being affected; before the extended end of the second cylinder is extended, the oil pump is turned on to make the grinding oil in the oil storage tank enter the oil injection cylinder, at this time, the extended end of the second cylinder is in the shortest state, the piston blocks the input end of the second oil injection pipe, so that the grinding oil in the oil injection cylinder is sprayed to the rear side of the inner wall of the oil storage tank through the first oil injection pipe, and the formed grinding oil layer will prevent the sparks generated during the grinding process from adhering to the rear side of the inner wall of the oil storage tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] When the present invention is in use, by controlling the extension of the protruding end of the second cylinder, the grinding tool simultaneously grinds the cut pipe and the cut portion of the raw pipe to remove the oxide layer. When the protruding end of the second cylinder is extended to the longest, the grinding tool completes the grinding, and the piston blocks the input end of the first fuel injection pipe. At this time, the protruding end of the first cylinder is controlled to extend to the longest, so that the rubber block drives the cut pipe to approach the raw pipe, so that the grinding oil sprayed from the second fuel injection pipe can be fully and efficiently applied to the cut pipe and the cut portion of the raw pipe to protect them and prevent oxidation from occurring again, so as to avoid affecting the subsequent normal welding of the two ends of the processed dining chair pipe.

[0019] When the present invention is in use, during the process of cutting the raw material pipe by the laser cutting tool, the air supply tool is turned on, and the nitrogen blown out is used to reduce the oxygen content around the raw material pipe, and the generated diffused sparks are shielded and collected by the grinding oil in the oil storage tank to prevent them from affecting the surrounding users and equipment; before the protruding end of the second cylinder is extended, the oil pump is turned on to allow the grinding oil in the oil storage tank to enter the oil filling cylinder. At this time, the protruding end of the second cylinder is in the shortest state, and the piston blocks the input end of the second oil injection pipe, so that the grinding oil in the oil injection cylinder is sprayed to the rear side of the inner wall of the oil storage tank through the first oil injection pipe. The formed grinding oil layer will prevent the sparks generated during the grinding process from adhering to the rear side of the inner wall of the oil storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a front cross-sectional view of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the positioning mechanism structure of the present invention;

[0023] Figure 3 It is a three-dimensional schematic diagram of the positioning mechanism structure of the present invention;

[0024] Figure 4 It is a three-dimensional schematic diagram of the local structure of the positioning mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the grinding mechanism structure of the present invention;

[0026] Figure 6 It is a three-dimensional schematic diagram of the local structure of the grinding mechanism of the present invention.

[0027] In the figure: 1. laser cutting tool; 2. grinding mechanism; 3. oil pump; 4. conveying tool; 5. base; 6. oil storage tank; 7. positioning mechanism; 8. mounting plate; 9. air supply tool; 201. second cylinder; 202. connecting rod; 203. piston; 204. oil outlet pipe; 205. oil inlet pipe; 206. oil injection cylinder; 207. first oil injection pipe; 208. turning frame; 209. second oil injection pipe; 210. fixing pin; 211. grinding tool; 701. baffle; 702. lifting rod; 703. guide groove; 704. transmission roller; 705. support table; 706. rubber block; 707. L-shaped turning plate; 708. lever; 709. roller; 710. second guide plate; 711. rubber plate; 712. first cylinder; 713. pin shaft. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. 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.

[0029] See also Figure 1-Figure 6 As shown, a laser cutting machine for processing dining chair tubes includes a base 5 and an oil storage tank 6 fixedly arranged on the top thereof, a positioning mechanism 7 for fixing the raw tube is arranged on one side of the oil storage tank 6, and a mounting plate 8 is fixedly arranged on the base 5 at the rear side of the oil storage tank 6, and a grinding mechanism 2 for removing burrs on the end of the raw tube is arranged on the front side of the mounting plate 8.

[0030] See also Figure 2 and Figure 3 As shown, the positioning mechanism 7 includes a support platform 705 fixedly connected to the base 5, a guide groove 703 for placing the raw material pipe is provided on the top of the support platform 705, a plurality of transmission rollers 704 for moving the raw material pipe are rotatably provided at the bottom of the inner wall of the guide groove 703, and an auxiliary pressing unit for preventing the raw material pipe from shaking is also provided inside the guide groove 703.

[0031] See also Figure 3 and Figure 4 As shown, a first cylinder 712 arranged transversely is fixedly mounted on the above-mentioned mounting plate 8, a lever 708 is fixedly mounted on the protruding end of the first cylinder 712, and an L-shaped flip plate 707 is rotatably arranged on the mounting plate 8 on one side of the first cylinder 712 via a pin shaft 713, and one end of the L-shaped flip plate 707 is movably connected to the lever 708.

[0032] See also Figure 2 and Figure 3 As shown, a rubber block 706 for positioning the raw material pipe is fixedly installed on the other end of the L-shaped flip plate 707 , and the rubber block 706 is located inside the guide groove 703 .

[0033] See also Figure 2 and Figure 3 As shown, the auxiliary pressing unit includes a first guide plate fixedly connected to the top of the support platform 705, a lifting rod 702 is movably inserted in the middle of the first guide plate, a baffle 701 is fixedly installed in the middle and upper part of the lifting rod 702, and a thrust spring is elastically arranged between the baffle 701 and the first guide plate.

[0034] See also Figure 3 and Figure 4As shown, a roller 709 is rotatably provided at the top of the lifting rod 702, and the position of the roller 709 corresponds to the position of the L-shaped flip plate 707. A rubber plate 711 is fixedly installed at the bottom end of the lifting rod 702, and the position of the rubber plate 711 corresponds to the position of the raw material pipe.

[0035] See also Figure 3 As shown, a second guide plate 710 is fixedly installed on the inner wall of the guide groove 703 below the above-mentioned first guide plate, and the middle part of the lifting rod 702 moves through the second guide plate 710; by controlling the extension of the protruding end of the second cylinder 201, the grinding tool 211 simultaneously grinds the cut pipe and the cut part of the raw pipe to remove the oxide layer. When the protruding end of the second cylinder 201 is extended to the longest, the grinding tool 211 completes the grinding, and the piston 203 blocks the input end of the first oil injection pipe 207. At this time, the protruding end of the first cylinder 712 is controlled to extend to the longest, so that the rubber block 706 drives the cut pipe close to the raw pipe, so that the grinding oil sprayed from the second oil injection pipe 209 is fully and efficiently applied to the cut pipe and the cut part of the raw pipe to protect them and prevent oxidation from occurring again, so as to avoid affecting the subsequent normal welding of the two ends of the processed dining chair pipe.

[0036] See also Figure 1 , Figure 5 and Figure 6 As shown, the above-mentioned grinding mechanism 2 includes a flip frame 208 which is rotatably connected to the top of the oil storage tank 6 through a rotating seat, and a grinding tool 211 is fixedly arranged on the top of the flip frame 208. The grinding tool 211 is a prior art, and the output end position of the grinding tool 211 corresponds to the cutting position of the raw material pipe. A longitudinally arranged second cylinder 201 is fixedly installed on the mounting plate 8, and a fixing pin 210 is fixedly connected to the protruding end of the second cylinder 201, and one end of the fixing pin 210 is movably connected to the side of the flip frame 208.

[0037] See also Figure 5 As shown, an oil injection cylinder 206 is fixedly installed on the inner wall of the above-mentioned oil storage tank 6, and the bottom of the side of the oil injection cylinder 206 is connected to a first oil injection pipe 207, and the output end of the first oil injection pipe 207 is arranged toward the rear side of the inner wall of the oil storage tank 6, and the top of the side of the oil injection cylinder 206 is connected to a second oil injection pipe 209, and the output end of the second oil injection pipe 209 is toward the cutting point of the raw material pipe.

[0038] See also Figure 5As shown, the extended end of the second cylinder 201 is also fixedly connected with a connecting rod 202, the bottom end of the connecting rod 202 movably penetrates the oil filling cylinder 206 and is fixedly connected with a piston 203, an oil pump 3 is fixedly arranged on the base 5, the input end of the oil pump 3 is connected with the bottom of the oil storage tank 6 through an oil inlet pipe 205, and the output end of the oil pump 3 is connected with an oil outlet pipe 204, and the oil outlet pipe 204 is connected with the middle part of the oil filling cylinder 206; in the process of cutting the raw material pipe by the laser cutting tool 1, the air supply tool 9 is turned on, and the nitrogen blown out is used to reduce the oxygen content around the raw material pipe, and the nitrogen gas in the oil storage tank 6 is blown out. The grinding oil can block and collect the generated diffused sparks to prevent them from affecting the surrounding users and equipment; before the protruding end of the second cylinder 201 is extended, the oil pump 3 is turned on to allow the grinding oil in the oil storage tank 6 to enter the oil filling cylinder 206. At this time, the protruding end of the second cylinder 201 is in the shortest state, and the piston 203 blocks the input end of the second oil injection pipe 209, so that the grinding oil in the oil injection cylinder 206 is sprayed to the rear side of the inner wall of the oil storage tank 6 through the first oil injection pipe 207. The formed grinding oil layer will prevent the sparks generated during the grinding process from adhering to the rear side of the inner wall of the oil storage tank 6.

[0039] See also Figure 1 As shown, a laser cutting tool 1 for cutting raw pipes is fixedly arranged on the front of the above-mentioned mounting plate 8. The laser cutting tool 1 is a prior art, and a gas supply tool 9 for blowing out nitrogen is arranged on one side of the laser cutting tool 1. The gas supply tool 9 is a prior art, and the output end of the gas supply tool 9 is arranged toward the cutting position of the raw pipe.

[0040] See also Figure 1 and Figure 2 As shown, two conveying fixtures 4 for conveying raw material pipes are fixedly installed on one side of the oil storage tank 6 away from the support platform 705, and the conveying fixtures 4 are prior art.

[0041] Working principle: When the present invention is used, first, Figure 1 and Figure 2 As shown, one end of the raw material pipe is conveyed to a plurality of driving rollers 704 by two conveying fixtures 4, and the extended end of the first cylinder 712 is controlled to shrink from the longest to half the length, so that the lever 708 drives the L-shaped flip plate 707 to flip, and the rubber block 706 is closely attached to one end of the raw material pipe to provide a limit for one end of the raw material pipe, so as to prevent the laser cutting fixture 1 from deviating when cutting the raw material pipe; Figure 1 and Figure 3 As shown, during the process of cutting the raw material pipe by the laser cutting tool 1, the gas supply tool 9 is turned on, and the nitrogen gas blown out is used to reduce the oxygen content around the raw material pipe, reduce the cut pipe and the oxide layer formed at the cutting position of the raw material pipe, and the grinding oil in the oil storage tank 6 is used to block and collect the generated and diffused sparks to prevent the surrounding users and equipment from being affected; Figure 2 and Figure 4 As shown, after the cutting is completed, the extended end of the first cylinder 712 is controlled to be retracted to the shortest, so that the rubber block 706 drives the cut pipe to move. At the same time, the L-shaped flip plate 707 provides pressure on the roller 709, so that the lifting rod 702 and the rubber plate 711 move downward, and the cut pipe is positioned by the rubber plate 711 and the rubber block 706 to prevent the grinding tool 211 from shaking when grinding the cut pipe; Figure 1 and Figure 5 As shown, the grinding tool 211 is turned on. In the process of controlling the extension of the extended end of the second cylinder 201, the turning frame 208 is rotated. The grinding tool 211 grinds the cut pipe and the cut portion of the raw pipe at the same time to remove the oxide layer. Before the extended end of the second cylinder 201 is extended, the oil pump 3 is turned on to allow the grinding oil in the oil storage tank 6 to enter the oil injection cylinder 206 through the oil inlet pipe 205 and the oil outlet pipe 204. At this time, the extended end of the second cylinder 201 is in the shortest state, and the piston 203 blocks the input end of the second oil injection pipe 209, so that the grinding oil in the oil injection cylinder 206 is sprayed to the rear side of the inner wall of the oil storage tank 6 through the first oil injection pipe 207. The formed grinding oil layer will prevent the sparks generated during the grinding process from adhering to the rear side of the inner wall of the oil storage tank 6; Figure 2 and Figure 5 As shown, when the protruding end of the second cylinder 201 is extended to its longest length, the grinding tool 211 completes the simultaneous grinding of the cut pipe and the cut portion of the raw pipe, and the piston 203 blocks the input end of the first oil spray pipe 207. At this time, the protruding end of the first cylinder 712 is controlled to be extended to its longest length, so that the rubber block 706 drives the cut pipe close to the raw pipe, so that the grinding oil sprayed from the second oil spray pipe 209 can be fully and efficiently applied to the cut pipe and the cut portion of the raw pipe to protect them and prevent oxidation from occurring again, thereby avoiding affecting the subsequent normal welding at both ends of the processed dining chair pipe.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A laser cutting machine for processing dining chair tubes, comprising a base (5) and an oil storage tank (6) fixedly arranged on the top thereof, characterized in that: A positioning mechanism (7) for fixing the raw material pipe is arranged on one side of the oil storage tank (6), and a mounting plate (8) is fixedly arranged on the base (5) at the rear side of the oil storage tank (6), and a grinding mechanism (2) for removing burrs from the end of the raw material pipe is arranged on the front side of the mounting plate (8); The positioning mechanism (7) comprises a support platform (705) fixedly connected to the base (5), a guide groove (703) is provided on the top of the support platform (705), a plurality of transmission rollers (704) for moving the raw material pipe are rotatably arranged at the bottom of the inner wall of the guide groove (703), and an auxiliary pressing unit for preventing the raw material pipe from shaking is also arranged inside the guide groove (703).

2. The laser cutting machine for processing dining chair tubes according to claim 1 is characterized in that: A first cylinder (712) is fixedly mounted on the mounting plate (8), a lever (708) is fixedly mounted on the protruding end of the first cylinder (712), and an L-shaped flip plate (707) is rotatably arranged on the mounting plate (8) on one side of the first cylinder (712), one end of the L-shaped flip plate (707) is movably connected to the lever (708).

3. The laser cutting machine for processing dining chair tubes according to claim 2 is characterized in that: A rubber block (706) for positioning the raw material pipe is fixedly mounted on the other end of the L-shaped flip plate (707), and the rubber block (706) is located inside the guide groove (703).

4. The laser cutting machine for processing dining chair tubes according to claim 1 is characterized in that: The auxiliary pressing unit comprises a first guide plate fixedly connected to the top of the support platform (705), a lifting rod (702) is movably inserted in the middle of the first guide plate, a baffle (701) is fixedly installed in the middle and upper part of the lifting rod (702), and a thrust spring is elastically arranged between the baffle (701) and the first guide plate.

5. The laser cutting machine for processing dining chair tubes according to claim 4 is characterized in that: A roller (709) is rotatably provided at the top of the lifting rod (702), and the position of the roller (709) corresponds to the position of the L-shaped flip plate (707). A rubber plate (711) is fixedly installed at the bottom end of the lifting rod (702), and the position of the rubber plate (711) corresponds to the position of the raw material pipe.

6. The laser cutting machine for processing dining chair tubes according to claim 4, characterized in that: A second guide plate (710) is fixedly mounted on the inner wall of the guide groove (703) below the first guide plate, and the middle portion of the lifting rod (702) movably passes through the second guide plate (710).

7. The laser cutting machine for processing dining chair tubes according to claim 1 is characterized in that: The grinding mechanism (2) comprises a turning frame (208) rotatably connected to the top of the oil storage tank (6); a grinding tool (211) is fixedly arranged on the top of the turning frame (208); the output end position of the grinding tool (211) corresponds to the cutting position of the raw material pipe; a second cylinder (201) is fixedly installed on the mounting plate (8); a fixing pin (210) is fixedly connected to the protruding end of the second cylinder (201); one end of the fixing pin (210) is movably connected to the side of the turning frame (208).

8. The laser cutting machine for processing dining chair tubes according to claim 7, characterized in that: An oil injection cylinder (206) is fixedly mounted on the inner wall of the oil storage tank (6); the bottom of the side of the oil injection cylinder (206) is connected to a first oil injection pipe (207); the output end of the first oil injection pipe (207) faces the rear side of the inner wall of the oil storage tank (6); the top of the side of the oil injection cylinder (206) is connected to a second oil injection pipe (209); the output end of the second oil injection pipe (209) faces the cutting position of the raw material pipe.

9. The laser cutting machine for processing dining chair tubes according to claim 7, characterized in that: The extended end of the second cylinder (201) is also fixedly connected to a connecting rod (202), the bottom end of the connecting rod (202) movably passes through the oil injection cylinder (206) and is fixedly connected to a piston (203), an oil pump (3) is fixedly arranged on the base (5), the input end of the oil pump (3) is connected to the bottom of the oil storage tank (6) through an oil inlet pipe (205), and the output end of the oil pump (3) is connected to an oil outlet pipe (204), and the oil outlet pipe (204) is connected to the middle part of the oil injection cylinder (206).

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