A cutting device for the production of pressure vessels

Abstract

The present invention relates to the field of circular sawing equipment, in particular to a cutting equipment for the production of pressure vessels, including a conveying support, a numerical control circular saw and a workpiece, and further comprising: a frame body, which is composed of a pair of rectangular side frames and four cross bars connecting the side frames, and each side frame is composed of an upper channel steel, a lower channel steel and two vertical channel steels; a clamping mechanism, which includes two vertically arranged guide rods, the top and bottom of the guide rods are both horizontally provided with guide rails, and the two ends of the guide rods are slidably connected between the adjacent guide rails, and two slide tables are slidably connected to the two guide rods. On the basis of retaining the advantage of small space occupation of the circular saw cutting equipment, the device can also automatically judge the diameter of the workpiece, and select the best position to clamp and drive the workpiece to rotate, so as to realize the cutting of workpieces with different pipe diameters.

Description

Technical Field

[0001] The present invention relates to the field of circular saw cutting equipment, and in particular to a cutting equipment for the production of pressure vessels. Background Art

[0002] For the production of the bottle bodies of small high-pressure pressure vessels, such as fire extinguisher cylinders, compressed gas cylinders, etc., the production is generally carried out by heating and rolling the ends of steel pipes while heating, closing the two ends of the steel pipes and then processing interfaces to assemble fittings such as valve bodies. The production of seamless steel pipes is achieved by extruding steel bars. The length of seamless steel pipes depends on their production equipment and cannot be flexibly adjusted. Therefore, before the hot pressing process of the pressure vessel bottle body, the seamless steel pipes need to be cut into sections first.

[0003] The shape of the steel pipe circular saw cutting equipment is close to a straight line, while the shape of the steel pipe band saw cutting equipment is close to a cross. Therefore, the floor area of the band saw cutting equipment is relatively larger than that of the circular saw cutting equipment. However, the applicable range of the band saw cutting for different pipe diameters is very wide, while the cutting range of the circular saw cutting equipment is limited by the radius of the saw blade and can often only be used for the cutting and processing of small-diameter pipes. Under ideal conditions, it is necessary to reduce the volume of the steel pipe cutting equipment to reduce the occupation of the site by the cutting equipment, and at the same time, the cutting equipment should be able to be compatible with a larger cutting and processing range. Therefore, a cutting equipment for the production of pressure vessels that can perform rotary cutting on steel pipes is proposed. Summary of the Invention

[0004] In view of the problems of the cutting and processing equipment for the pressure vessel bottle body in the above or existing technologies, that is, the floor area of the band saw cutting equipment is large while the processing range of the circular saw cutting equipment is narrow, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a cutting equipment for the production of pressure vessels.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A cutting device for the production of pressure vessels, including a conveying support, a numerical control circular saw and a workpiece, further comprising: a frame body, which is composed of a pair of rectangular side frames and four cross bars connecting the side frames, and each side frame is composed of an upper channel steel, a lower channel steel and two vertical channel steels; a clamping mechanism, which includes two vertically arranged guide rods, guide rails are horizontally arranged at the top and bottom of each guide rod, and the two ends of the guide rod are slidably connected to the adjacent guide rails. Two sliding tables are slidably connected to the two guide rods, and a pair of rollers are rotatably connected to the side of the two sliding tables close to each other. Hydraulic cylinders I are fixedly connected to the sides of the two guide rods far from each other, and the piston rods of the two hydraulic cylinders I are vertically upward and fixedly connected to the adjacent sliding tables. A cylinder and a bidirectional lead screw are arranged between the bottoms of the two guide rods, and the cylinder block of the cylinder is fixedly connected to the adjacent lower channel steel, the piston rod of the cylinder is perpendicularly and fixedly connected to the guide rod, and the bidirectional lead screw is threadedly connected to the guide rod. A set of clamping mechanisms are assembled in each side frame. In one side frame, the two guide rails are respectively fixedly connected to the upper channel steel and the lower channel steel, and the two ends of the bidirectional lead screw are respectively rotatably connected to the two vertical channel steels; a measuring mechanism, which includes an angle steel fixedly connected to the top of the frame body, and a slide rail is fixedly connected to the angle steel. A hydraulic cylinder II is slidably connected to the slide rail on the angle steel, the piston rod of the hydraulic cylinder II is vertically downward, and a connecting rod is hinged between the bottom end of the piston rod of the hydraulic cylinder II and one end of the angle steel.

[0007] As a preferred scheme of the cutting device for the production of pressure vessels of the present invention, wherein: the numerical control circular saw is sleeved in the frame body, and the shell of the numerical control circular saw is fixedly connected to the frame body. The workpiece passes through the two side frames of the frame body parallel to the cross bar, and the conveying support slidably supports the part of the workpiece outside the frame body. The numerical control circular saw is located at the bottom of the workpiece, and the axis of the workpiece is parallel to the axis of the cutting blade of the numerical control circular saw.

[0008] As a preferred scheme of the cutting device for the production of pressure vessels of the present invention, wherein: the conveying support is arranged in a concave shape, and bull's-eye rollers are arranged on both sides of the conveying support. The shell of the bull's-eye roller is fixedly connected to the conveying support, and the bull's-eye roller is in rolling contact with the outer wall of the workpiece.

[0009] As a preferred scheme of the cutting device for the production of pressure vessels of the present invention, wherein: springs are sleeved on the tops of the two guide rods where the sliding tables are located.

[0010] As a preferred scheme of the cutting device for the production of pressure vessels of the present invention, wherein: the cylinder, the lower channel steel and the bidirectional lead screw are parallel to each other, and the two sections of threads of the bidirectional lead screw from the middle to both ends are symmetric to each other.

[0011] As a preferred embodiment of the cutting equipment for the production of pressure vessels according to the present invention, the angle steel is fixedly connected to the bottom edge of the upper channel steel of the two groups of frames, and the angle steel is connected to the middle of the upper channel steel. The angle steel extends outside the frame at the end where the equipment feeds, and the connecting rod is hinged to the bottom edge of the extended end of the angle steel.

[0012] As a preferred embodiment of the cutting equipment for the production of pressure vessels according to the present invention, at the bottom of the end of the connecting rod far from the hinge axis with the angle steel, a ball is connected with a ball, and the ball is in rolling contact with the outer wall of the workpiece.

[0013] As a preferred embodiment of the cutting equipment for the production of pressure vessels according to the present invention, in one set of clamping mechanisms, the axes of the four rollers are parallel to the axis of the workpiece, and the rollers are in rolling press contact with the outer wall of the workpiece. And one of the sliding tables is fixedly connected with a motor. One end of the rotating shaft of the roller and the output shaft of the motor are both connected with belt pulleys, and a synchronous belt is wound around the three belt pulleys.

[0014] As a preferred embodiment of the cutting equipment for the production of pressure vessels according to the present invention, the rotation direction of the output shaft of the motor is opposite to the rotation direction of the circular saw blade of the numerical control circular saw.

[0015] As a preferred embodiment of the cutting equipment for the production of pressure vessels according to the present invention, the top end of the cylinder body of the second hydraulic cylinder is communicated with the bottom end of the cylinder body of the first hydraulic cylinder through an oil pipe, and the effective acting area ratio of the piston rods of the first hydraulic cylinder and the second hydraulic cylinder is 1:2.

[0016] The beneficial effects of the cutting equipment for the production of pressure vessels according to the present invention: On the basis of retaining the advantage of small space occupation of the circular saw cutting equipment, the device can also automatically judge the diameter of the workpiece through the measuring mechanism, and through the second hydraulic cylinder of the measuring mechanism, the first hydraulic cylinder of the clamping mechanism is linked to drive the sliding table to rise to the best position to clamp the workpiece and drive the workpiece to rotate, realizing the efficient cutting of workpieces with different pipe diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the overall structure of the cutting equipment for the production of pressure vessels.

[0019] Figure 2 For the cutting equipment for the production of pressure vessels Figure 1 The structural schematic diagram at A therein.

[0020] Figure 3 for Figure 1 Schematic diagram of the structure from another perspective.

[0021] Figure 4 Exploded view of the connecting frame between the two clamping mechanisms of a cutting device used in pressure vessel production.

[0022] Figure 5 This is a cross-sectional view of the clamping mechanism and frame assembly structure of the cutting equipment used in pressure vessel production.

[0023] Figure 6 Schematic diagram of the measuring mechanism and frame assembly structure of the cutting equipment used in pressure vessel production (oblique upward perspective).

[0024] Figure 7 This is a schematic diagram of the interaction structure between the measuring mechanism and steel pipe of the cutting equipment used in pressure vessel production.

[0025] In the figure: 100, conveying bracket; 101, CNC circular saw; 100a, bull's eye roller; 200, frame; 201, frame; 202, cross bar; 201a, upper channel steel; 201b, lower channel steel; 201c, vertical channel steel; 300, clamping mechanism; 301, guide rod; 302, guide rail; 303, slide; 304, roller; 305, hydraulic cylinder 1; 306, bidirectional screw rod; 307, cylinder; 308, spring; 309, motor; 310, pulley; 311, synchronous belt; 400, measuring mechanism; 401, angle steel; 402, hydraulic cylinder 2; 403, connecting rod; 404, ball bearing; 500, workpiece. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example, see Figures 1 - 7 , which is the first embodiment of the present invention, provides a cutting device for pressure vessel production, which can cut steel pipes of different diameters in a large range, and the device has a compact structure and occupies a small area. Figure 1 As shown, it includes a conveying bracket 100, a CNC circular saw 101 and a workpiece 500, and also includes a frame 200, a clamping mechanism 300 and a measuring mechanism 400, as shown in FIG. Figure 4 As shown, the frame 200 is composed of a pair of rectangular frames 201 and four cross bars 202 connecting the frames 201. Each frame 201 is composed of an upper channel steel 201a, a lower channel steel 201b and two vertical channel steels 201c. Figure 5As shown, the clamping mechanism 300 includes two vertically arranged guide rods 301. At the top and bottom of the guide rods 301, guide rails 302 are horizontally arranged, and both ends of the guide rods 301 are slidably connected to the adjacent guide rails 302. A slide table 303 is slidably connected to both guide rods 301, and a pair of rollers 304 are rotatably connected to one side of the two slide tables 303 that are close to each other. On the side where the two guide rods 301 are away from each other, a first hydraulic cylinder 305 is fixedly connected, and the piston rods of the two first hydraulic cylinders 305 are vertically upward and fixedly connected to the adjacent slide table 303. Between the bottoms of the two guide rods 301, a cylinder 307 and a double - lead screw 306 are arranged. The cylinder body of the cylinder 307 is fixedly connected to the adjacent lower channel steel 201b, the piston rod of the cylinder 307 is perpendicularly and fixedly connected to the guide rod 301, and the double - lead screw 306 is threadedly connected to the guide rod 301; As Figure 4 As shown, a set of clamping mechanisms 300 are assembled in each frame 201. In one frame 201, the two guide rails 302 are respectively fixedly connected to the upper channel steel 201a and the lower channel steel 201b, and the two ends of the double - lead screw 306 are respectively rotatably connected to the two vertical channel steels 201c; As Figure 6 and Figure 7 As shown, the measuring mechanism 400 includes an angle steel 401 fixedly connected to the top of the frame body 200, and the angle steel 401 is fixedly connected with a slide rail. A second hydraulic cylinder 402 is slidably connected to the slide rail on the angle steel 401. The piston rod of the second hydraulic cylinder 402 is vertically downward, and a connecting rod 403 is hinged between the bottom end of the piston rod of the second hydraulic cylinder 402 and one end of the angle steel 401.

[0028] Specifically, as Figure 1 and Figure 3 As shown, the numerical control circular saw 101 is sleeved in the frame body 200, and the housing of the numerical control circular saw 101 is fixedly connected to the frame body 200. The workpiece 500 passes through the two frames 201 of the frame body 200 parallel to the cross - bar 202, and the conveying bracket 100 slidably supports the part of the workpiece 500 outside the frame body 200. The numerical control circular saw 101 is located at the bottom of the workpiece 500, and the axis of the workpiece 500 is parallel to the axis of the cutting blade of the numerical control circular saw 101. The conveying bracket 100 is arranged in a concave shape, and bull - eye rollers 100a are arranged on both sides of the conveying bracket 100. The housing of the bull - eye roller 100a is fixedly connected to the conveying bracket 100, and the bull - eye roller 100a is in rolling contact with the outer wall of the workpiece 500; As Figure 4 As shown, springs 308 are sleeved on the top ends of the slide tables 303 of both guide rods 301; The cylinder 307, the lower channel steel 201b, and the double - lead screw 306 are parallel to each other, and the two sections of threads of the double - lead screw 306 from the middle to both ends are symmetric to each other; As Figure 6As shown in the figure, the angle steel 401 is fixedly connected to the bottom of the upper channel steel 201a of the two groups of frames 201, and the angle steel 401 is connected to the middle of the upper channel steel 201a. The angle steel 401 extends outside the frame 200 at the end where the equipment feeds, and the connecting rod 403 is hinged to the bottom of the extended end of the angle steel 401. As Figure 7 shown, at the bottom of the end of the connecting rod 403 far from the hinge axis with the angle steel 401, a ball 404 is ball-jointed, and the ball 404 is in rolling contact with the outer wall of the workpiece 500; as Figure 2 shown, in a set of clamping mechanisms 300, the axes of the four rollers 304 are parallel to the axis of the workpiece 500, and the rollers 304 are in rolling press contact with the outer wall of the workpiece 500. One of the sliding tables 303 is fixedly connected with a motor 309. One end of the rotating shaft of the roller 304 and the output shaft of the motor 309 are both connected with belt pulleys 310, and a synchronous belt 311 is wound around the three belt pulleys 310. The rotation direction of the output shaft of the motor 309 is opposite to the rotation direction of the saw blade of the numerical control circular saw 101.

[0029] The present invention mainly provides a circular saw cutting device that can quickly adapt to different diameters of the workpiece 500 by itself, and identifies the diameter of the workpiece 500 in a purely mechanical way. The sliding table 303 in the clamping mechanism 300 is vertically lifted to the height of the central axis of the workpiece 500, so that the clamping mechanism 300 clamps at symmetric positions on both sides of the workpiece 500 and drives the workpiece 500 to rotate. During the process, the numerical control circular saw 101 cuts from the bottom of the workpiece 500.

[0030] In the prior art, the saw blade of the numerical control circular saw 101 can be controlled to rise and fall, and the present invention operates on this basis.

[0031] To achieve the above functions, the present invention also involves the following technical details:

[0032] First, the present invention is provided with a measuring mechanism 400. Taking Figure 1 the perspective as an example, when a workpiece 500 feeds from the left to the right through the measuring mechanism 400, the end of the workpiece 500 will push the connecting rod 403, causing the end of the connecting rod 403 hinged to the second hydraulic cylinder 402 to deflect upward. The hinge axis of the connecting rod 403 and the hydraulic cylinder moves along an arc motion path, which can be decomposed into two directions of motion. One is a horizontal linear displacement along the guide rail 302 on the angle steel 401, and the other is a vertical displacement. The displacement in the horizontal direction is adapted by the sliding of the second hydraulic cylinder 402 along the guide rail 302, and the displacement in the vertical direction is used to measure the diameter of the workpiece 500. Initially, the ball 404 at the bottom of the connecting rod 403 is at the (approximate) lowest point of the workpiece 500 on the conveying support 100. When the workpiece 500 passes through the measuring mechanism 400, as Figure 3As shown, the ball 404 will slide along with the movement to the top of the workpiece 500. During this process, the ball 404 is displaced vertically by a height equal to the diameter of the workpiece 500 (allowing for a small amount of error).

[0033] The top of the cylinder block of the second hydraulic cylinder 402 is connected to the bottom of the cylinder block of the first hydraulic cylinder 305 through an oil pipe. The effective acting areas of the piston rods of the first hydraulic cylinder 305 and the second hydraulic cylinder 402 are in a ratio of 1:2. After this condition is established, according to Pascal's law, the total piston area of the four first hydraulic cylinders 305 is twice the piston area of the second hydraulic cylinder 402. Assuming that the pistons of the four first hydraulic cylinders 305 move synchronously, the stroke of the piston rod of the second hydraulic cylinder 402 moving with the ball 404 is twice the stroke of the first hydraulic cylinder 305. Therefore, when the ball 404 moves a distance equal to the diameter of the workpiece 500, the first hydraulic cylinder 305 will push the sliding table 303 to rise vertically along the guide rail 302 by a height equal to the radius of the workpiece 500. If the starting point of the sliding table 303 is set to be the same as that of the ball 404, then the sliding table 303 will be lifted to the position on the central axis on both sides of the workpiece 500.

[0034] Second, the clamping mechanism 300 of the present invention, as Figure 5 shown, the two ends of the bidirectional lead screw 306 are rotatably connected to the frame 201. Therefore, the bidirectional lead screw 306 cannot be displaced except for rotation. The bidirectional lead screw 306 is used to make the two guide rods 301 connected to it move synchronously towards or away from each other relative to the frame 201. Through the transmission of the lead screw, the air cylinder 307 only needs to push or pull one of the guide rods 301 to achieve the movement control of the two guide rods 301. When the sliding table 303 reaches the target height, the air cylinder 307 can be used to drive the two guide rods 301 to move towards each other, so that the rollers 304 on the sliding table 303 clamp the outer wall of the workpiece 500. Then, the motor 309, belt pulley 310 and synchronous belt 311 are used to drive the rollers 304 to rotate. The rollers 304 drive the workpiece 500 to rotate through friction. At this time, it only needs to ensure that the cutting depth of the saw blade of the numerical control circular saw 101 is greater than the wall thickness of the pipe fitting. In order to smoothly achieve the above operations, ball screws and ball nuts should be used.

[0035] Thirdly, to achieve the functional objectives in "one" and "two", the piston rods of four hydraulic cylinders 305 need to move synchronously. However, due to the slight differences in the movement resistance of each piston rod, when the total oil intake remains unchanged, the movement speeds of the piston rods of each hydraulic cylinder 305 are not necessarily the same. Therefore, in the clamping mechanism 300, springs 308 of the same specification are configured for each hydraulic cylinder 305. The elastic force generated by the compression of the springs 308 during the movement of the sliding table 303 is much higher than the difference in the movement resistance between the piston rods. Therefore, if the movement resistance of one of the piston rods is small and the speed is fast, it means that this piston rod will compress the spring 308 faster, which means that a higher oil inlet pressure than that of other hydraulic cylinders 305 is required. And the hydraulic cylinders 305 are connected and share the same oil inlet, and the oil inlet pressures of each hydraulic cylinder 305 are also the same. Therefore, under the same oil inlet pressure, there is no pressure for a certain hydraulic cylinder 305 to obtain a greater compression stroke of the spring 308. Therefore, there will be no significant difference in the compression stroke of each spring 308, and the stronger the elasticity of the spring 308, the smaller this compression stroke difference will be and can be ignored. Therefore, through the covering effect of the elastic force of the spring 308 on the difference in the movement resistance of the piston rods, the piston rods of each hydraulic cylinder 305 are kept (allowing slight differences) moving synchronously.

[0036] In summary, on the basis of retaining the advantage of small space occupation of the circular saw cutting equipment, this device can also automatically judge the diameter of the workpiece 500, select the best position for clamping, drive the workpiece 500 to rotate, and realize the cutting of workpieces 500 with different pipe diameters.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A cutting device for the production of pressure vessels, comprising a conveying support (100), a numerical control circular saw (101) and a workpiece (500), characterized in that: It further includes a frame body (200) composed of a pair of rectangular side frames (201) and four cross bars (202) connecting the side frames (201), and each side frame (201) is composed of an upper channel steel (201a), a lower channel steel (201b) and two vertical channel steels (201c); a clamping mechanism (300) including two vertically arranged guide rods (301), with guide rails (302) horizontally arranged at both the top and bottom ends of the guide rods (301), and the two ends of the guide rods (301) are slidably connected to the adjacent guide rails (302). Two slide tables (303) are slidably connected to the two guide rods (301), and a pair of rollers (304) are rotatably connected to the sides of the two slide tables (303) close to each other. Hydraulic cylinders I (305) are fixedly connected to the sides of the two guide rods (301) far from each other, and the piston rods of the two hydraulic cylinders I (305) are vertically upward and fixedly connected to the adjacent slide tables (303). A cylinder (307) and a bidirectional lead screw (306) are arranged between the bottom ends of the two guide rods (301), and the cylinder body of the cylinder (307) is fixedly connected to the adjacent lower channel steel (201b), the piston rod of the cylinder (307) is perpendicularly and fixedly connected to the guide rod (301), and the bidirectional lead screw (306) is threadedly connected to the guide rod (301). A set of clamping mechanisms (300) are assembled in each side frame (201). In one side frame (201), the two guide rails (302) are respectively fixedly connected to the upper channel steel (201a) and the lower channel steel (201b), and the two ends of the bidirectional lead screw (306) are respectively rotatably connected to the two vertical channel steels (201c); a measuring mechanism (400) including an angle steel (401) fixedly connected to the top of the frame body (200), and a slide rail is fixedly connected to the angle steel (401). A hydraulic cylinder II (402) is slidably connected to the slide rail on the angle steel (401), the piston rod of the hydraulic cylinder II (402) is vertically downward, and a connecting rod (403) is hinged between the bottom end of the piston rod of the hydraulic cylinder II (402) and one end of the angle steel (401).

2. The cutting device for the production of pressure vessels according to claim 1, characterized in that: The numerical control circular saw (101) is sleeved inside the frame body (200), and the housing of the numerical control circular saw (101) is fixedly connected to the frame body (200). The workpiece (500) passes through the two side frames (201) of the frame body (200) parallel to the cross bar (202), and the conveying bracket (100) slidably supports the part of the workpiece (500) outside the frame body (200). The numerical control circular saw (101) is located at the bottom of the workpiece (500), and the axis of the workpiece (500) is parallel to the axis of the cutting disc of the numerical control circular saw (101).

3. The cutting equipment for the production of pressure vessels according to claim 2, characterized in that: The conveying bracket (100) is arranged in a concave shape, and bull's-eye rollers (100a) are arranged on both sides of the conveying bracket (100). The housing of the bull's-eye rollers (100a) is fixedly connected to the conveying bracket (100), and the bull's-eye rollers (100a) are in rolling contact with the outer wall of the workpiece (500).

4. The cutting device for the production of pressure vessels according to claim 3, characterized in that: A spring (308) is sleeved on the top of each of the two guide rods (301) on the sliding table (303).

5. The cutting device for the production of pressure vessels according to claim 1, characterized in that: The cylinder (307), the lower channel steel (201b), and the bidirectional lead screw (306) are parallel to each other, and the two sections of threads of the bidirectional lead screw (306) from the middle to both ends are symmetrical to each other.

6. The cutting equipment for the production of pressure vessels according to claim 5, wherein: The angle steel (401) is fixedly connected to the bottom edge of the upper channel steel (201a) of the two groups of frames (201), and the angle steel (401) is connected to the middle of the upper channel steel (201a). The angle steel (401) extends outside the frame body (200) at the end where the equipment feeds, and the connecting rod (403) is hinged to the bottom edge of the extended end of the angle steel (401).

7. The cutting equipment for the production of pressure vessels according to claim 1, characterized in that: A ball (404) is ball-jointed to the bottom of the end of the connecting rod (403) far from the hinge axis with the angle steel (401), and the ball (404) is in rolling contact with the outer wall of the workpiece (500).

8. The cutting device for the production of pressure vessels according to claim 7, characterized in that: In a set of clamping mechanisms (300), the axes of the four rollers (304) are parallel to the axis of the workpiece (500), and the rollers (304) are in rolling press contact with the outer wall of the workpiece (500). One of the sliding tables (303) is fixedly connected with a motor (309). One end of the rotating shaft of the roller (304) and the output shaft of the motor (309) are both connected with belt pulleys (310), and a synchronous belt (311) is wound around the three belt pulleys (310).

9. The cutting device for the production of pressure vessels according to claim 8, characterized in that: The rotation direction of the output shaft of the motor (309) is opposite to the rotation direction of the saw blade of the numerical control circular saw (101).

10. The cutting device for the production of pressure vessels according to claim 1, characterized in that: The top end of the cylinder body of the second hydraulic cylinder (402) is communicated with the bottom end of the cylinder body of the first hydraulic cylinder (305) through an oil pipe, and the effective acting area ratio of the piston rods of the first hydraulic cylinder (305) and the second hydraulic cylinder (402) is 1:2.

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