A fully automatic conveyor line polishing machine for LNG cylinders

Abstract

The present invention relates to a fully automatic conveyor line polishing machine for LNG gas cylinders, comprising an outer ring weld grinder, a tank body polisher and a head polisher which are arranged in sequence, a transition frame connected to a transmission roller is provided between the outer ring weld grinder and the tank body polisher and between the tank body polisher and the head polisher, the outer ring weld grinder comprises a positioning plate, a first cylinder located on a frame is installed at one end of the positioning plate, and first grinding heads connected to a driving device are installed on both sides of the top of the frame, and a ring seam groove connected to a workpiece is provided near the first grinding head at one end of the positioning plate. Beneficial effect: The present invention designs a fully automatic grinding machine for gas cylinders according to the production process of gas cylinders, and adds this automatic grinding production line without changing the original process. This line can process the cylinder body, front and rear heads and front and rear ring welds of the gas cylinder at one time. The operation is simple, and automatic loading and unloading does not require manual loading and unloading and repeated operations, and the output is high.

Description

Technical Field

[0001] The invention relates to the technical field of polishing and grinding devices, and in particular to a fully automatic conveying line polishing machine for LNG gas cylinders. Background Art

[0002] Polishing machines are also called grinders and are often used for mechanical grinding, polishing and waxing. The working principle is: the motor drives the sponge or wool polishing disc installed on the polishing machine to rotate at high speed. Due to the combined effect of the polishing disc and the polishing agent and the friction with the surface to be polished, the paint surface pollution, oxide layer and shallow marks can be removed. The speed of the polishing disc is generally 1500-3000 r / min, most of which are stepless speed change, and can be adjusted at any time according to the needs during construction.

[0003] Liquefied natural gas is liquefied natural gas (LNG). It is natural gas that has undergone a series of processes such as low-temperature condensation, so that it can be liquefied at ultra-low temperature (-162°C) and normal pressure to become liquefied natural gas. (Natural gas cannot be liquefied by pressurization at room temperature. The temperature must be lowered to about -80°C or below to be liquefied under a certain pressure.)

[0004] Polishing refers to a processing method that uses mechanical, chemical or electrochemical effects to reduce the surface roughness of the workpiece to obtain a bright and flat surface. At present, there is a great demand for LNG cylinders in the market, but the treatment process of the outer surface of the cylinder is still in the semi-automatic stage, that is, the current grinding process is basically to grind each process separately, relying on manual workpiece placement at different process treatments, and then manually operate the machine to process the various stages of the outer surface of the LNG cylinder. The outer surface treatment of the cylinder is divided into three parts: outer ring weld treatment, cylinder outer surface polishing, and cylinder end head polishing. At present, this type of process has low output and a large number of manual workers. Summary of the invention

[0005] The purpose of the present invention is to provide a fully automatic conveyor line polishing machine for LNG gas cylinders which can process the cylinder body, front and rear heads and front and rear ring welds at one time, is simple to operate, automatically loads and unloads materials without manual loading and unloading and repeated operation, and has high output, and is achieved through the following scheme.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: an automatic conveyor line polishing machine for LNG cylinders, comprising an outer ring weld grinder, a tank body polisher and a head polisher arranged in sequence, and a transition frame connected to a transmission roller is provided between the outer ring weld grinder and the tank body polisher and between the tank body polisher and the head polisher;

[0007] The outer ring weld grinder comprises a positioning plate, a first cylinder located on a frame is installed at one end of the positioning plate, and first grinding heads connected to a driving device are installed on both sides of the top of the frame, and an annular groove connected to a workpiece is opened near the first grinding head at one end of the positioning plate;

[0008] The tank polishing machine comprises a transmission shaft connected to the first motor, a transmission connection is achieved between the transmission shaft and the roller via a transmission chain, the center of the roller is fixed on the electric hydraulic push rod, and both ends of the outer wall of the electric hydraulic push rod are integrally formed with protrusions, wherein the protrusion is connected to the recessed part on the second grinding head by a clamping fixation, and one end of the second grinding head is connected to the frame via a rolling bearing away from the side of the electric hydraulic push rod, wherein one end of the driving wheel on the tank polishing machine is fixedly connected to the driver, and one end of the driven wheel is installed on a supporting beam connected to the driving wheel via a swing rod, and the swing rod and the supporting beam are rotatably connected via a movable shaft, and a second cylinder is fixedly installed on one side of the swing rod, and a rolling groove connected to the driving wheel is provided on the outer wall of the supporting beam;

[0009] The head polishing machine includes symmetrically arranged columns, guide plates are fixedly connected between the columns, a horizontal slider is movably connected to the guide plate, and a vertical slider is movably connected to the center of the outer wall of the horizontal slider, the horizontal slider and the vertical slider are respectively connected to a horizontal motor and a vertical motor compatible with them, one side of the outer wall of the vertical slider is connected to a rotating motor through a strip block close to the frame, the output shaft on the rotating motor is fixedly connected to the third grinding head, and one end of the rotating motor is movably connected to the vertical slider through a hinge, and the rotating motor and the vertical slider are connected through a third cylinder.

[0010] Furthermore, the outer ring weld grinder and the tank body polisher are both placed in the cover, and one end of the outer ring weld grinder and the head polisher is respectively connected to a loading port and a unloading port, and one side of the outer wall of the cover is movably connected to a door frame.

[0011] Furthermore, the roller and the electric hydraulic push rod are fixed to each other via a coupling, and the vertical center lines of the roller and the electric hydraulic push rod are maintained on the same axis.

[0012] Furthermore, one end of the horizontal motor and the vertical motor are respectively connected to a walking shaft and a lifting shaft, the rotating wheel on the walking shaft is connected to a guide groove matching it along the length direction of the guide plate, one end of the lifting shaft is fixed on the rotating tooth, one end of the rotating tooth is engaged with a gear plate located on the inner wall of the bar block, and both ends of the inner wall of the bar block are connected to sliding grooves along the height direction of the vertical slider.

[0013] Furthermore, the rotating motor and the third grinding head are connected via a rotating shaft transmission, and a head bogie connected to the workpiece is provided at the bottom end of the head polishing machine.

[0014] The technical effects of the present invention are:

[0015] This gas cylinder production line is mainly composed of three machines and several sets of racks, mainly including outer ring weld grinder, tank body polisher, head polisher. Each set of polishing machines is equipped with a transition rack in the middle for connecting the three machines and for feeding.

[0016] The girth weld polishing machine is mainly used to process the girth welds at the welding position of the gas level cylinder body and the head. The machine is equipped with two sets of grinding heads. The workpiece is transported to the girth weld polishing machine by the original conveyor rack. There is a mechanical loading and positioning at the rear end. The workpiece automatically stops at this position. The two sets of grinding heads automatically move to the girth weld and start grinding. After grinding, the workpiece is automatically unloaded to the conveyor rack.

[0017] The tank polishing machine is equipped with eight sets of grinding heads, which can be started simultaneously or individually. The workpiece is automatically transported from the front conveyor rack to the tank polishing machine and is placed at an angle offset by the driven wheel, so that the workpiece can rotate and move forward at a uniform speed slowly through the eight sets of grinding heads. The polished workpiece passes through two sets of conveyor racks in turn.

[0018] The end cap polishing machine is equipped with two sets of grinding heads, each set of grinding heads has three axes and is controlled by a CNC system. The workpiece passes through the conveyor rack to the positioning position of the end cap polishing machine, the workpiece rotates, and the two sets of grinding heads start grinding at the same time according to the pre-set grinding path. Each set of grinding heads has three axes, namely the lifting axis, the walking axis, and the rotating axis. The three axes can well solve the variability of the contact point between the elliptical arc surface of the end cap and the contact wheel during grinding, which causes the floating failure problem of the grinding head. The contact wheel can also fit the workpiece surface better through the rotation of the grinding head, so that the grinding effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0020] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0021] Figure 3 It is a front view of the present invention;

[0022] Figure 4 For the present invention Figure 1 A magnified image of point A;

[0023] Figure 5 It is a schematic diagram of the connection between the electric hydraulic push rod and the second grinding head of the present invention;

[0024] Figure 6 It is a schematic diagram of the connection between the driving wheel and the driven wheel of the present invention;

[0025] Figure 7 For the present invention Figure 1 A magnified view of point B;

[0026] Figure 8 For the present invention Figure 1 Enlarged view of point C;

[0027] Fig. 9 For the present invention Figure 2 Enlarged view of point D.

[0028] Figure markings: 1-outer ring weld grinder; 2-tank body polisher; 3-head polisher; 4-transition frame; 5-positioning plate; 6-first cylinder; 7-first grinding head; 8-first motor; 9-transmission shaft; 10-roller; 11-electric hydraulic push rod; 12-protrusion; 13-second grinding head; 14-recess; 15-driving wheel; 16-driven wheel; 17-swing rod; 18-support beam; 19-movable shaft; 20-second cylinder; 21-column; 22-guide plate; 23-horizontal slider; 24-vertical slider; 25-horizontal motor; 26-vertical motor; 27-bar block; 28-rotating motor; 29-third grinding head; 30-third cylinder; 31-travel shaft; 32-lifting shaft; 33-rotating shaft. DETAILED DESCRIPTION

[0029] See attached Figure 1-9 A fully automatic conveyor line polishing machine for LNG cylinders, characterized in that it comprises an outer ring weld grinder 1, a tank body polisher 2 and a head polisher 3 which are arranged in sequence, and a transition frame 4 connected to a transmission roller is provided between the outer ring weld grinder 1 and the tank body polisher 2 and between the tank body polisher 2 and the head polisher 3;

[0030] The outer ring weld grinder 1 comprises a positioning plate 5, a first cylinder 6 located on a frame is installed at one end of the positioning plate 5, and first grinding heads 7 connected to a driving device are installed on both sides of the top of the frame, and an annular groove connected to a workpiece is opened at one end of the positioning plate 5 near the first grinding head 7;

[0031] The tank polishing machine 2 includes a transmission shaft 9 connected to the first motor 8, and the transmission shaft 9 and the roller 10 are connected by a transmission chain. The center of the roller 10 is fixed on the electric hydraulic push rod 11, and the two ends of the outer wall of the electric hydraulic push rod 11 are integrally formed with protrusions 12, wherein the protrusion 12 is connected to the recessed portion 14 on the second grinding head 13 by a clamping fixation method, and one end of the second grinding head 13 is connected to the frame through a rolling bearing away from the side of the electric hydraulic push rod 11, wherein one end of the driving wheel 15 on the tank polishing machine 2 is fixedly connected to the driver, and one end of the driven wheel 16 is installed on a supporting beam 18 connected to the driving wheel 15 through a swing rod 17, and the swing rod 17 and the supporting beam 18 are rotatably connected through a movable shaft 19, and a second cylinder 20 is fixedly installed on one side of the swing rod 17, and a rolling groove connected to the driving wheel 15 is opened on the outer wall of the supporting beam 18;

[0032] The end polishing machine 3 includes symmetrically arranged columns 21, guide plates 22 are fixedly connected between the columns 21, a transverse slider 23 is movably connected to the guide plate 22, and a vertical slider 24 is movably connected to the center of the outer wall of the transverse slider 23, and the transverse slider 23 and the vertical slider 24 are respectively connected to a transverse motor 25 and a vertical motor 26 adapted thereto, and a rotating motor 28 is connected to one side of the outer wall of the vertical slider 24 near the frame through a strip block 27, the output shaft of the rotating motor 28 is fixedly connected to the third grinding head 29, and one end of the rotating motor 28 is movably connected to the vertical slider 24 through a hinge, and the rotating motor 28 and the vertical slider 24 are connected through a third cylinder 30.

[0033] A specific embodiment of the present scheme is that the outer ring weld grinder 1 and the tank body polisher 2 are both placed in a cover body, and one end of the outer ring weld grinder 1 and the head polisher 3 are respectively connected with a loading port and a unloading port, and a door frame is movably connected to one side of the outer wall of the cover body. The setting of the cover body plays a role of limiting protection for the periphery of the conveyor line, and the door frame can be opened to carry out corresponding maintenance work.

[0034] A specific embodiment of the present scheme is that the workpiece on the outer ring weld grinder 1 is transported to the ring weld polisher by the original conveyor frame, and there is a mechanical loading and positioning at the rear end. The workpiece automatically stops at this position, and the two groups of grinding heads automatically move to the ring weld to start grinding. A first cylinder 6 located on the frame is installed at one end of the positioning plate 5. The first cylinder 6 drives the positioning plate 5 to rise and fall, so as to limit the position of the transferred workpiece. The annular groove on the positioning plate 5 is conducive to the alignment of the workpiece placement and parking position, which is convenient for grinding.

[0035] A specific embodiment of the present scheme is that the roller 10 and the electric hydraulic push rod 11 are fixed to each other through a coupling, and the vertical center lines of the roller 10 and the electric hydraulic push rod 11 are maintained on the same axis. The transmission shaft 9 connected to the first motor 8, the transmission shaft 9 and the roller 10 are connected through a transmission chain to achieve transmission connection, the center of the roller 10 is fixed on the electric hydraulic push rod 11, the grinding heads can be started simultaneously or individually, firstly, the first motor 8 drives the roller 10 to rotate through the transmission shaft 9, so that the roller 10 can rotate through the second grinding head 13 connected to the transmission member, but when the grinding head rotates alone, it can be directly rotated through the roller 10, and when the roller 10 is started at the same time, the protrusion 12 on the piston rod driven by the electric hydraulic push rod 11 can be clamped and fixed with the recessed portion 14 on the grinding head at the other end, and so on, so that multiple grinding heads can be connected to rotate simultaneously.

[0036] A specific embodiment of the present scheme is that one end of the driven wheel 16 is mounted on a supporting beam 18 connected to the driving wheel 15 through a swing rod 17, and the swing rod 17 and the supporting beam 18 are rotationally connected through a movable shaft 19, and a second cylinder 20 is fixedly mounted on one side of the swing rod 17. It can be seen from the above that the second cylinder 20 drives the swing rod 17 to rotate on the movable shaft 19, so that the angle of the driven wheel 16 is offset, so that the workpiece rotates and moves forward at a uniform speed slowly through eight groups of grinding heads under the rotation of the driving wheel 15 and the rotation and swing of the driven wheel 16, and the polished workpiece passes through two groups of conveying racks in turn.

[0037] A specific embodiment of the present scheme is that one end of the horizontal motor 25 and the vertical motor 26 are respectively connected to a walking shaft 31 and a lifting shaft 32, and the rotating wheel on the walking shaft 31 is connected with a guide groove matched with it along the length direction of the guide plate 22, and one end of the lifting shaft 32 is fixed on the rotating tooth, and one end of the rotating tooth is meshed with a gear plate located on the inner wall of the bar block 27, and both ends of the inner wall of the bar block 27 are connected with sliding grooves along the height direction of the vertical slider 24.

[0038] A specific embodiment of the present scheme is that the horizontal slider 23 and the vertical slider 24 are respectively connected with a horizontal motor 25 and a vertical motor 26 adapted thereto. The horizontal motor 25 realizes the translational movement of the device on the guide plate 22 through the rotation of the rotating wheel, and the vertical motor 26 is meshed and transmitted on the gear plate through the rotating teeth connected to the lifting shaft 32, thereby driving the device to be lifted and lowered.

[0039] In addition, one end of the rotating motor 28 is movably connected to the vertical slider 24 through a hinge, and the rotating motor 28 and the vertical slider 24 are connected through a third cylinder 30. Both ends of the third cylinder 30 are respectively set to be rotatably connected with the rotating motor 28 and the strip block 27, so that under the push of the third cylinder 30, the third grinding head 29 can perform rotational grinding. Each group of grinding heads has three axes, namely, a lifting axis, a walking axis, and a rotating axis. The three axes can well solve the variability of the contact point between the elliptical arc surface of the head and the contact wheel during grinding.

[0040] In a specific embodiment of this solution, the rotating motor 28 and the third grinding head 29 are connected via a rotating shaft 33 .

[0041] The specific implementation of this solution is to design a fully automatic grinding machine for gas cylinders according to the production process of gas cylinders. This line is in line with the existing production line of the manufacturer. Without changing the original process, this automatic grinding production line is added. This line can process the cylinder body, front and rear heads, and front and rear girth welds of gas cylinders at one time. The operation is simple, and the automatic loading and unloading does not require manual loading and unloading and repeated operations, and the output is high.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A fully automatic conveyor line polishing machine for LNG cylinders, characterized in that: It comprises an outer ring weld grinder (1), a tank body polisher (2) and a head polisher (3) which are arranged in sequence, wherein a transition frame (4) connected to a transmission roller is provided between the outer ring weld grinder (1) and the tank body polisher (2) and between the tank body polisher (2) and the head polisher (3); The outer ring weld grinding machine (1) comprises a positioning plate (5), a first cylinder (6) located on a frame is mounted on one end of the positioning plate (5), and first grinding heads (7) connected to a driving device are mounted on both sides of the top of the frame, and a ring seam groove connected to a workpiece is formed at one end of the positioning plate (5) near the first grinding head (7); The tank polishing machine (2) comprises a transmission shaft (9) connected to a first motor (8), wherein the transmission shaft (9) and a roller (10) are connected in transmission via a transmission chain, wherein the center of the roller (10) is fixed to an electric hydraulic push rod (11), and both ends of the outer wall of the electric hydraulic push rod (11) are integrally formed with protrusions (12), wherein the protrusions (12) are connected to a recessed portion (14) on a second grinding head (13) by means of a clamping fixation, and one end of the second grinding head (13) is away from the electric hydraulic push rod (11). One side is connected to the frame via a rolling bearing, wherein one end of a driving wheel (15) on the tank polishing machine (2) is fixedly connected to the driver, one end of a driven wheel (16) is mounted on a supporting beam (18) connected to the driving wheel (15) via a swing rod (17), and the swing rod (17) and the supporting beam (18) are rotatably connected via a movable shaft (19), and a second cylinder (20) is fixedly mounted on one side of the swing rod (17), and a rolling groove connected to the driving wheel (15) is provided on the outer wall of the supporting beam (18); The end polishing machine (3) comprises symmetrically arranged columns (21), wherein a guide plate (22) is fixedly connected between the columns (21), a transverse slider (23) is movably connected to the guide plate (22), and a vertical slider (24) is movably connected to the center of the outer wall of the transverse slider (23), and a transverse motor (25) and a vertical motor (26) adapted thereto are connected to the transverse slider (23) and the vertical slider (24), respectively, and a rotating motor (28) is connected to one side of the outer wall of the vertical slider (24) near the frame through a strip block (27), an output shaft of the rotating motor (28) is fixedly connected to a third grinding head (29), and one end of the rotating motor (28) is movably connected to the vertical slider (24) through a hinge, and the rotating motor (28) and the vertical slider (24) are connected through a third cylinder (30); The outer ring weld grinder (1) and the tank body polisher (2) are both placed outside the housing, and one end of the outer ring weld grinder (1) and the end cap polisher (3) are respectively connected to a loading port and a unloading port, and one side of the outer wall of the housing is movably connected to a door frame; The roller (10) and the electric hydraulic push rod (11) are fixed to each other via a coupling, and the vertical center lines of the roller (10) and the electric hydraulic push rod (11) are maintained on the same axis.

2. The LNG cylinder fully automatic conveyor line polishing machine according to claim 1 is characterized in that: One end of the horizontal motor (25) and the vertical motor (26) are respectively connected to a walking shaft (31) and a lifting shaft (32); a rotating wheel on the walking shaft (31) is connected to a guide groove matching the guide plate (22) along the length direction; one end of the lifting shaft (32) is fixed to a rotating tooth; one end of the rotating tooth is meshed with a gear plate located on the inner wall of the strip block (27); and both ends of the inner wall of the strip block (27) are connected to sliding grooves along the height direction of the vertical slider (24).

3. The LNG cylinder fully automatic conveyor line polishing machine according to claim 1 is characterized in that: The rotating motor (28) and the third grinding head (29) are connected in transmission via a rotating shaft (33), and a head bogie connected to a workpiece is provided at the bottom end of the head polishing machine (3).

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