A plasma welding device for raising the furnace cover of a single crystal furnace and a method for using the same

Abstract

The present invention relates to the field of single crystal furnace welding. The present invention discloses a plasma welding device for a heightened section of a single crystal furnace cover and a method for using the same. The problem to be solved by the present invention is that the existing device requires two clamps to fix the single crystal furnace cover and the heightened pipe respectively, which is relatively troublesome to operate. The present invention is composed of a furnace cover inner support fixing mechanism, a spring telescopic structure and a welding mechanism. The plasma welding device for a heightened section of a single crystal furnace cover and a method for using the same extend the cylinder to drive the deflection plate on the slider to deflect, and cooperate with the first deflection push plate to push the L-shaped inner support plate to move parallel to the side away from the outer pipe, so that the four L-shaped inner support plates are supported inside the cover of the single crystal furnace cover; and when the cylinder extends, the four L-shaped clamps are driven to expand and support in parallel inside the heightened pipe at the same time, so that the central axis of the heightened pipe is coaxial with the central axis of the single crystal furnace cover, and the single crystal furnace cover and the heightened pipe are fixed, which is convenient for subsequent welding of the two.

Description

Technical Field

[0001] The invention relates to the field of single crystal furnace welding, and in particular to a single crystal furnace cover heightening section plasma welding device and a use method thereof. Background Art

[0002] A single crystal furnace is a device that uses a graphite heater to melt polycrystalline materials such as polysilicon in an inert gas environment, and then uses the Czochralski method to grow single crystals without dislocation. It usually includes a furnace body, an electrical control cabinet, a heating transformer, a power filter cabinet, a main vacuum pump, a sub-chamber vacuum pump, vacuum pipelines, a hydraulic system, an argon system, and a cooling water system.

[0003] During the processing of some existing single crystal furnace covers, it is necessary to heighten their ends. When welding the single crystal furnace cover and the increased pipe, the existing welding device needs to use two clamps to fix the single crystal furnace cover and the increased pipe respectively, and then connect the two to ensure that the central axes of the two are coaxial, and then weld the two, which is more troublesome. Summary of the invention

[0004] The purpose of the present invention is to provide a plasma welding device for a heightened section of a single crystal furnace cover and a method for using the same, so as to solve the problem in the above background technology that the existing device requires two clamps to fix the single crystal furnace cover and the heightened pipe respectively, and then weld the two, which is a relatively troublesome operation. In order to achieve the above purpose, the present invention provides the following technical solutions: a plasma welding device for a heightened section of a single crystal furnace cover, comprising a base, a placement frame is fixedly connected to the middle of the top surface of the base, a fixing frame is fixedly connected to the top surface of the base, and the fixing frame is on the upper side of the placement frame, a cylinder is fixedly connected to the fixing frame, and a furnace cover inner support fixing mechanism is fixedly connected to the lower end of the cylinder;

[0005] A welding mechanism is installed on the furnace cover inner support fixing mechanism, through which the single crystal furnace cover and the increased pipe are internally supported and fixed, and the welding mechanism is used to weld the connection between the single crystal furnace cover and the increased pipe.

[0006] Preferably, the furnace cover inner support fixing mechanism comprises a first spring telescopic rod fixed to the lower end of the cylinder, an outer tube is movably sleeved on the lower end of the inner rod of the first spring telescopic rod, four through slots are opened on the outer side of the outer tube, a slider is slidably connected in the through slot, the slider is fixed to the inner rod of the first spring telescopic rod, and a deflection plate is hinged on the side of the slider away from the inner rod of the first spring telescopic rod;

[0007] Two first deflection push plates are hinged on the outer wall of the outer tube, and the two first deflection push plates are arranged parallel to each other, the upper first deflection push plate is hinged to one end of the deflection plate away from the inner rod of the first spring telescopic rod, and one end of the two first deflection push plates away from the outer tube is hinged to an L-shaped inner support plate;

[0008] Two parallel second deflection push plates are hinged on the outer wall of the outer tube, an L-shaped clamping plate is hinged on one end of the two second deflection push plates away from the outer tube, and a spring telescopic structure is hinged on the upper second deflection push plate.

[0009] Preferably, the spring telescopic structure comprises a sliding rod hinged on the second deflection push plate on the upper side, two limiting tooth plates are installed on the side of the sliding rod, and the two limiting tooth plates are arranged back to back, an outer sleeve is sleeved on one end of the sliding rod, and a second spring telescopic rod is fixedly connected between the inner wall of the outer sleeve and the sliding rod;

[0010] One end of the sliding rod is fixedly connected with a hook rod, and the hook rod is on the upper side of the outer sleeve, and a locking piece is arranged on the outer sleeve.

[0011] Preferably, the locking member includes an inverted U-shaped rod sliding on the outside of the outer sleeve, both ends of the inverted U-shaped rod are inclined surfaces, both ends of the inverted U-shaped rod are overlapped with L-shaped clamping rods, the L-shaped clamping rod and the outer sleeve are parallel to each other, and the L-shaped clamping rod is hinged on the outer sleeve, one end of the L-shaped clamping rod abuts against two limiting tooth plates, and a return spring is fixedly connected between the other end of the L-shaped clamping rod and the outer sleeve.

[0012] Preferably, the welding mechanism comprises a motor fixed on the outer sleeve of the first spring telescopic rod, the motor is connected to a one-way bearing through a belt drive, and the one-way bearing is rotatably sleeved on the outer sleeve of the first spring telescopic rod, a transverse hydraulic cylinder is fixedly connected to the outer wall of the outer ring of the one-way bearing, the lower end of the transverse hydraulic cylinder is fixedly connected to a longitudinal hydraulic cylinder, and the lower end of the longitudinal hydraulic cylinder is rotatably connected to a plasma welding machine;

[0013] Two L-shaped connecting rods are fixedly connected to the bottom surface of the inner ring of the one-way bearing. The L-shaped connecting rods are parallel to the first spring telescopic rod, and one end of the two L-shaped connecting rods away from the one-way bearing is fixedly connected to an arc rod. The two ends of the arc rod are conical, and an extrusion rod is fixedly connected to the arc rod, and the extrusion rod is in the shape of a "J". The extrusion rod is on the inner side of the hook rod.

[0014] Preferably, a locking mechanism is fixedly connected to the first spring telescopic rod, and the locking mechanism comprises a C-shaped hook plate on the outer sleeve of the first spring telescopic rod, the inner side of the C-shaped hook plate abuts against a C-shaped clamping plate, and the top surface of the C-shaped clamping plate is fixedly connected to a first right-angled triangle block, and the inside of the C-shaped clamping plate is fixedly connected to a second right-angled triangle block, and the inclined surface of the second right-angled triangle block faces in the opposite direction to that of the first right-angled triangle block;

[0015] The left and right sides of the C-shaped clamping plate are both fixedly connected with a return spring telescopic rod, and one end of the return spring telescopic rod away from the C-shaped clamping plate is fixed on the outer wall of the outer tube.

[0016] Preferably, four vertical rods are fixedly connected to the lower end surface of the outer sleeve of the first spring telescopic rod, and the vertical rods slide in vertical grooves opened on the outer wall of the outer tube. Two inclined extrusion blocks are fixedly connected to the vertical rods, and the inclined extrusion blocks are in contact with a fan-shaped tooth plate, which is hinged to the outer wall of the outer tube. The fan-shaped tooth plate also contacts with a limiting tooth block, and the limiting tooth block is fixed on the first deflection push plate.

[0017] Preferably, the method for using the plasma welding device for raising the furnace cover of a single crystal furnace comprises the following steps:

[0018] S1: First, place the single crystal furnace cover on the placement rack, then place the expansion tube on the port of the single crystal furnace cover, and then drive the outer tube to be inserted into the interior of the single crystal furnace cover by extending the cylinder, and then as the cylinder continues to extend, the outer tube hits the placement rack, and at this time, the inner rod of the first spring telescopic rod slides down in the outer tube, driving the deflection plate on the slider to deflect, and cooperates with the first deflection push plate to push the L-shaped inner support plate to move parallel to the side away from the outer tube, so that the four L-shaped inner support plates are supported inside the cover of the single crystal furnace cover;

[0019] When the cylinder is extended, the outer sleeve of the first spring telescopic rod moves downward to drive the outer sleeve to deflect, and cooperates with the sliding rod to squeeze the second deflection push plate to deflect, so that the four L-shaped clamping plates are simultaneously expanded and supported in parallel inside the increased tube, so that the central axis of the increased tube is coaxial with the central axis of the single crystal furnace cover, and the single crystal furnace cover and the increased tube are fixed, which is convenient for subsequent welding of the two;

[0020] S2: As the first spring telescopic rod continues to move downward, the C-shaped hook plate is driven to move downward to squeeze the first right-angle triangle block, so that the first right-angle triangle block drives the C-shaped clamping plate to move counterclockwise and then reset, thereby restricting the C-shaped hook plate after moving downward;

[0021] Then, the length of the horizontal hydraulic cylinder and the longitudinal hydraulic cylinder is adjusted so that the plasma welding machine on the longitudinal hydraulic cylinder is aligned with the welding seam between the single crystal furnace cover and the outer side of the increased pipe, and the motor is started to drive the one-way bearing to rotate clockwise, and the welding seam between the single crystal furnace cover and the outer side of the increased pipe is welded by the plasma welding machine;

[0022] S3: When it is necessary to weld the welding seam between the single crystal furnace cover and the inner side of the increased tube, the plasma welding machine is aligned with the welding seam between the single crystal furnace cover and the inner side of the increased tube by adjusting the extension length of the horizontal hydraulic cylinder and the longitudinal hydraulic cylinder, and then the one-way bearing is driven by the motor to rotate counterclockwise, so that the L-shaped connecting rod on the lower end surface of the one-way bearing drives the arc rod and the extrusion rod to rotate counterclockwise at the same time, at this time, one end of the arc rod squeezes the first inverted U-shaped rod in the counterclockwise direction, so that the inverted U-shaped rod moves down to squeeze the L-shaped clamping rod deflection, and releases the locking state of the L-shaped clamping rod on the sliding rod and the outer sleeve, and then as the extrusion rod rotates counterclockwise, the extrusion hook rod moves up, driving the sliding rod to slide in the outer sleeve, so that the L-shaped clamping plate at the end of the second deflection push plate is separated from the inner wall of the increased tube, ensuring that the distance between the L-shaped clamping plate and the inner wall of the increased tube is sufficient for the longitudinal hydraulic cylinder to pass through;

[0023] After the longitudinal hydraulic cylinder passes through the first L-shaped clamping plate and the increased tube in the counterclockwise direction, the arc rod continues to squeeze the hook rod in the counterclockwise direction in sequence to ensure that the plasma welding machine at the lower end of the longitudinal hydraulic cylinder can fit the welding seam between the single crystal furnace cover and the inner side of the increased tube and rotate for one circle for welding.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the present invention, the cylinder is extended so that the outer tube hits the placement rack. At this time, the inner rod of the first spring telescopic rod slides downward in the outer tube, driving the deflection plate on the slider to deflect, and cooperates with the first deflection push plate to push the L-shaped inner support plate to move parallel to the side away from the outer tube, so that the four L-shaped inner support plates are supported inside the cover of the single crystal furnace cover; and when the cylinder is extended, the outer sleeve of the first spring telescopic rod moves downward to drive the outer sleeve to deflect, and cooperates with the sliding rod to squeeze the second deflection push plate to deflect, so that the four L-shaped clamping plates are simultaneously expanded and supported in parallel inside the increased tube, so that the central axis of the increased tube is coaxial with the central axis of the single crystal furnace cover, and the single crystal furnace cover and the increased tube are fixed, which is convenient for subsequent welding of the two.

[0026] In the present invention, as the first spring telescopic rod continues to move downward, it drives the C-shaped hook plate to move downward and squeeze the first right-angled triangle block, so that the first right-angled triangle block drives the C-shaped clamping plate to move counterclockwise and then reset, restricting the C-shaped hook plate after moving downward, further ensuring the stability of the device for the single crystal furnace cover and the increased tube inner support; then, the extension length of the horizontal hydraulic cylinder and the longitudinal hydraulic cylinder is adjusted, so that the plasma welding machine on the longitudinal hydraulic cylinder is aligned with the welding seam on the outer side of the single crystal furnace cover and the increased tube, and the motor is started to drive the one-way bearing to rotate clockwise, and the welding seam on the single crystal furnace cover and the outer side of the increased tube is welded by the plasma welding machine.

[0027] In the present invention, by adjusting the extension length of the horizontal hydraulic cylinder and the longitudinal hydraulic cylinder, the plasma welding machine is aligned with the welding seam on the inner side of the single crystal furnace cover and the increased tube, and then the one-way bearing is driven by the motor to rotate counterclockwise, so that the L-shaped connecting rod on the lower end surface of the one-way bearing drives the arc rod and the extrusion rod to rotate counterclockwise at the same time. At this time, one end of the arc rod squeezes the first inverted U-shaped rod in the counterclockwise direction, so that the inverted U-shaped rod moves downward to squeeze the L-shaped clamping rod deflection, and the locking state of the L-shaped clamping rod on the sliding rod and the outer sleeve is released. Then, as the extrusion rod rotates counterclockwise, the extrusion hook rod moves upward, driving the sliding rod to slide in the outer sleeve, so that the L-shaped clamping plate at the end of the second deflection push plate is separated from the inner wall of the increased tube, ensuring that the distance between the L-shaped clamping plate and the inner wall of the increased tube is sufficient for the longitudinal hydraulic cylinder to pass through, thereby ensuring the stability of the device in welding the weld seam between the single crystal furnace cover and the increased tube inner support. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the second deflection push plate and the L-shaped clamping plate of the present invention;

[0031] Figure 4 It is a schematic diagram of the three-dimensional structure of the slider and the deflection plate of the present invention;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the first deflection push plate and the L-shaped inner support plate of the present invention;

[0033] Figure 6 It is a schematic diagram of the three-dimensional structure of the arc rod and the extrusion rod of the present invention;

[0034] Figure 7 It is a three-dimensional structural schematic diagram of the sliding rod and the limiting tooth plate of the present invention;

[0035] Figure 8 It is a three-dimensional structural schematic diagram of the L-shaped clamping rod and the return spring of the present invention.

[0036] In the figure: 1, base; 2, placement rack; 3, fixing rack; 4, cylinder; 5, furnace cover inner support fixing mechanism; 51, first spring telescopic rod; 52, outer tube; 53, through groove; 54, slider; 55, deflection plate; 56, first deflection push plate; 57, L-shaped inner support plate; 58, second deflection push plate; 59, L-shaped card plate; 6, spring telescopic structure; 61, sliding rod; 62, limit tooth plate; 63, outer sleeve; 64, second spring telescopic rod; 65, hook rod; 7, locking member; 71, inverted U-shaped rod; 7 2. L-shaped clamping rod; 73. reset spring; 8. welding mechanism; 81. motor; 82. one-way bearing; 83. horizontal hydraulic cylinder; 84. longitudinal hydraulic cylinder; 85. plasma welding machine; 86. L-shaped connecting rod; 87. arc rod; 88. extrusion rod; 9. locking mechanism; 91. C-shaped hook plate; 92. C-shaped clamping plate; 93. first right-angle triangle block; 94. second right-angle triangle block; 95. reset spring telescopic rod; 10. vertical rod; 11. inclined extrusion block; 12. fan-shaped tooth plate; 13. limit tooth block. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 technical personnel in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 8 The present invention provides a technical solution: a plasma welding device for a single crystal furnace cover heightening section, comprising a base 1, a placing frame 2 is fixedly connected to the middle of the top surface of the base 1, a fixing frame 3 is fixedly connected to the top surface of the base 1, and the fixing frame 3 is on the upper side of the placing frame 2, a cylinder 4 is fixedly connected to the fixing frame 3, and a furnace cover inner support fixing mechanism 5 is fixedly connected to the lower end of the cylinder 4;

[0039] A welding mechanism 8 is installed on the furnace cover inner support fixing mechanism 5, through which the single crystal furnace cover and the increased pipe are internally supported and fixed, and the welding mechanism 8 cooperates to weld the connection between the single crystal furnace cover and the increased pipe.

[0040] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the furnace cover inner support fixing mechanism 5 includes a first spring telescopic rod 51 fixed to the lower end of the cylinder 4, an outer tube 52 is movably sleeved on the lower end of the inner rod of the first spring telescopic rod 51, four through slots 53 are opened on the outer side of the outer tube 52, a slider 54 is slidably connected in the through slots 53, the slider 54 is fixed to the inner rod of the first spring telescopic rod 51, and a deflection plate 55 is hinged on the side of the slider 54 away from the inner rod of the first spring telescopic rod 51;

[0041] Two first deflection push plates 56 are hinged on the outer wall of the outer tube 52, and the two first deflection push plates 56 are arranged parallel to each other. The upper first deflection push plate 56 is hinged to one end of the deflection plate 55 away from the inner rod of the first spring telescopic rod 51, and one end of the two first deflection push plates 56 away from the outer tube 52 is hinged to an L-shaped inner support plate 57;

[0042] Two parallel second deflection push plates 58 are hinged on the outer wall of the outer tube 52 , an L-shaped clamping plate 59 is hinged on one end of the two second deflection push plates 58 away from the outer tube 52 , and a spring telescopic structure 6 is hinged on the upper second deflection push plate 58 .

[0043] In this embodiment, Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 As shown, the spring telescopic structure 6 includes a sliding rod 61 hinged on the upper second deflection push plate 58, two limiting tooth plates 62 are installed on the side of the sliding rod 61, and the two limiting tooth plates 62 are arranged back to back, an outer sleeve 63 is sleeved on one end of the sliding rod 61, and a second spring telescopic rod 64 is fixedly connected between the inner wall of the outer sleeve 63 and the sliding rod 61;

[0044] One end of the sliding rod 61 is fixedly connected to a hook rod 65 , and the hook rod 65 is on the upper side of the outer sleeve 63 , and a locking member 7 is provided on the outer sleeve 63 .

[0045] In this embodiment, Figure 6 , Figure 7 , Figure 8 As shown, the locking member 7 includes an inverted U-shaped rod 71 sliding on the outside of the outer sleeve 63, both ends of the inverted U-shaped rod 71 are inclined surfaces, both ends of the inverted U-shaped rod 71 are overlapped with L-shaped clamping rods 72, the L-shaped clamping rod 72 and the outer sleeve 63 are parallel to each other, and the L-shaped clamping rod 72 is hinged on the outer sleeve 63, one end of the L-shaped clamping rod 72 abuts against two limit tooth plates 62, and a return spring 73 is fixedly connected between the other end of the L-shaped clamping rod 72 and the outer sleeve 63, which abuts against the limit tooth plate 62 through the limit tooth plate 62, thereby limiting the limit tooth plate 62 from moving to the side away from the outer sleeve 63.

[0046] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the welding mechanism 8 includes a motor 81 fixed on the outer sleeve of the first spring telescopic rod 51, the motor 81 is connected to a one-way bearing 82 through a belt drive, and the one-way bearing 82 is rotatably sleeved on the outer sleeve of the first spring telescopic rod 51, a transverse hydraulic cylinder 83 is fixedly connected to the outer wall of the outer ring of the one-way bearing 82, the lower end of the transverse hydraulic cylinder 83 is fixedly connected to a longitudinal hydraulic cylinder 84, and the lower end of the longitudinal hydraulic cylinder 84 is rotatably connected to a plasma welding machine 85;

[0047] Two L-shaped connecting rods 86 are fixedly connected to the bottom surface of the inner ring of the one-way bearing 82. The L-shaped connecting rods 86 are parallel to the first spring telescopic rod 51, and the ends of the two L-shaped connecting rods 86 away from the one-way bearing 82 are fixedly connected to an arc rod 87. The two ends of the arc rod 87 are tapered, and an extrusion rod 88 is fixedly connected to the arc rod 87. The extrusion rod 88 is in the shape of a "J". The extrusion rod 88 is on the inner side of the hook rod 65.

[0048] In this embodiment, Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, a locking mechanism 9 is fixedly connected to the first spring telescopic rod 51, and the locking mechanism 9 includes a C-shaped hook plate 91 on the outer sleeve of the first spring telescopic rod 51, the inner side of the C-shaped hook plate 91 abuts against a C-shaped clamping plate 92, and the top surface of the C-shaped clamping plate 92 is fixedly connected to a first right-angled triangle block 93, and the inside of the C-shaped clamping plate 92 is fixedly connected to a second right-angled triangle block 94, and the inclined surface of the second right-angled triangle block 94 is opposite to that of the first right-angled triangle block 93; the first spring telescopic rod 51 moves downward, driving the C-shaped hook plate 91 moves downward to squeeze the first right-angled triangle block 93, so that the first right-angled triangle block 93 drives the C-shaped clamping plate 92 to move counterclockwise and then reset, restricting the C-shaped hook plate 91 after moving downward, ensuring the stability of the device for the single crystal furnace cover and the increased pipe inner support; the first spring telescopic rod 51 is driven downward by the cylinder again, so that the C-shaped hook plate 91 squeezes the second right-angled triangle block 94, so that the second right-angled triangle block 94 drives the C-shaped clamping plate 92 to move clockwise, releasing the restriction of the C-shaped clamping plate 92 on the C-shaped hook plate 91.

[0049] The left and right sides of the C-shaped clamping plate 92 are both fixedly connected with a return spring telescopic rod 95 , and one end of the return spring telescopic rod 95 away from the C-shaped clamping plate 92 is fixed on the outer wall of the outer tube 52 .

[0050] In this embodiment, Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, four vertical rods 10 are fixedly connected to the lower end surface of the outer sleeve of the first spring telescopic rod 51, and the vertical rods 10 slide in the vertical grooves provided in the outer wall of the outer tube 52. Two inclined surface extrusion blocks 11 are fixedly connected to the vertical rods 10, and the inclined surface extrusion blocks 11 abut against the fan-shaped toothed plates 12, which are hinged on the outer wall of the outer tube 52, and the fan-shaped toothed plates 12 also abut against the limited toothed blocks 13, and the limited toothed blocks 13 are fixed on the first deflection push plate 56. The vertical rod 10 moves downward, so that the inclined surface extrusion blocks 11 on the vertical rod 10 squeeze the fan-shaped toothed plates 12 and get stuck on the limited toothed blocks 13, thereby locking the deflected first deflection push plate 56, preventing the L-shaped inner support plate 57 abutting against the inner wall of the single crystal furnace cover from deflecting, and ensuring the stability of the L-shaped inner support plate 57 supporting the inner wall of the single crystal furnace cover.

[0051] The use method and advantages of the present invention: The use method of the plasma welding device for the heightening section of the single crystal furnace cover is as follows:

[0052] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown:

[0053] S1: First, place the single crystal furnace cover on the placement rack 2, and then place the expansion tube on the port of the single crystal furnace cover, and then drive the outer tube 52 to be inserted into the interior of the single crystal furnace cover by extending the cylinder 4, and then as the cylinder 4 continues to extend, the outer tube 52 hits the placement rack 2, and at this time, the inner rod of the first spring telescopic rod 51 slides down in the outer tube 52, driving the deflection plate 55 on the slider 54 to deflect, and cooperates with the first deflection push plate 56 to push the L-shaped inner support plate 57 to move parallel to the side away from the outer tube 52, so that the four L-shaped inner support plates 57 are supported inside the cover of the single crystal furnace cover;

[0054] When the cylinder 4 is extended, the outer sleeve of the first spring telescopic rod 51 moves downward to drive the outer sleeve 63 to deflect, and cooperates with the sliding rod 61 to squeeze the second deflection push plate 58 to deflect, so that the four L-shaped clamping plates 59 are simultaneously expanded and supported in parallel inside the increased tube, so that the central axis of the increased tube is coaxial with the central axis of the single crystal furnace cover, and the single crystal furnace cover and the increased tube are fixed, which is convenient for subsequent welding of the two;

[0055] S2: As the first spring telescopic rod 51 continues to move downward, the C-shaped hook plate 91 is driven to move downward to squeeze the first right-angled triangle block 93, so that the first right-angled triangle block 93 drives the C-shaped clamping plate 92 to move counterclockwise and then reset, restricting the C-shaped hook plate 91 after it moves downward. After the C-shaped clamping plate 92 restricts the C-shaped hook plate 91 in the longitudinal direction, the outer sleeve of the first spring telescopic rod 51 moves downward to further increase the stability of the single crystal furnace cover and the increased pipe after docking;

[0056] Then, the length of the horizontal hydraulic cylinder 83 and the longitudinal hydraulic cylinder 84 is adjusted so that the plasma welding machine 85 on the longitudinal hydraulic cylinder 84 is aligned with the welding seam between the single crystal furnace cover and the outer side of the increased pipe, and the motor 81 is started to drive the one-way bearing 82 to rotate clockwise, and the welding seam between the single crystal furnace cover and the outer side of the increased pipe is welded by the plasma welding machine 85;

[0057] S3: When it is necessary to weld the welding seam between the single crystal furnace cover and the inner side of the increased pipe, the plasma welding machine 85 is aligned with the welding seam between the single crystal furnace cover and the inner side of the increased pipe by adjusting the extension length of the horizontal hydraulic cylinder 83 and the longitudinal hydraulic cylinder 84, and then the one-way bearing 82 is driven by the motor 81 to rotate counterclockwise, so that the L-shaped connecting rod 86 on the lower end surface of the one-way bearing 82 drives the arc rod 87 and the extrusion rod 88 to rotate counterclockwise at the same time. At this time, one end of the arc rod 87 squeezes the first inverted U-shaped rod 71 in the counterclockwise direction, so that the inverted U-shaped rod 71 moves downward to squeeze the L-shaped clamping rod 72 to deflect, thereby releasing the L-shaped clamping rod 72 from the sliding rod 61 is locked with the outer sleeve 63, and then as the extrusion rod 88 rotates counterclockwise, the extrusion hook rod 65 moves upward, driving the sliding rod 61 to slide in the outer sleeve 63, so that the L-shaped card plate 59 at the end of the second deflection push plate 58 is separated from the inner wall of the increased tube, ensuring that the distance between the L-shaped card plate 59 and the inner wall of the increased tube is sufficient for the longitudinal hydraulic cylinder 84 to pass through; when the extrusion rod 88 is separated from the hook rod 65, the second spring telescopic rod 64 drives the sliding rod 61 to deflect and reset, so that the second deflection push plate 58 and the L-shaped card plate 59 on the sliding rod 61 are reset, and again abut against the inner wall of the increased tube, thereby abutting and fixing the inner wall of the increased tube.

[0058] After the longitudinal hydraulic cylinder 84 passes through the first L-shaped clamping plate 59 and the increased tube in the counterclockwise direction, the arc rod 87 continues to squeeze the hook rod 65 in the counterclockwise direction in sequence to ensure that the plasma welding machine 85 at the lower end of the longitudinal hydraulic cylinder 84 can fit the welding seam between the single crystal furnace cover and the inner side of the increased tube, and the welding seam is rotated one circle for welding.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A plasma welding device for a single crystal furnace roof heightening section, comprising a base (1), characterized in that: A placement rack (2) is fixedly connected to the middle of the top surface of the base (1), a fixing rack (3) is fixedly connected to the top surface of the base (1), and the fixing rack (3) is on the upper side of the placement rack (2), a cylinder (4) is fixedly connected to the fixing rack (3), and a furnace cover inner support fixing mechanism (5) is fixedly connected to the lower end of the cylinder (4); The furnace cover inner support fixing mechanism (5) is provided with a welding mechanism (8), and the furnace cover and the increased tube are fixed by the furnace cover inner support fixing mechanism (5), and the connection between the furnace cover and the increased tube is welded in cooperation with the welding mechanism (8); The furnace cover inner support fixing mechanism (5) comprises a first spring telescopic rod (51) fixed on the lower end of the cylinder (4); an outer tube (52) is movably sleeved on the lower end of the inner rod of the first spring telescopic rod (51); four through grooves (53) are provided on the outer side of the outer tube (52); a slider (54) is slidably connected in the through groove (53); the slider (54) is fixed on the inner rod of the first spring telescopic rod (51); a deflection plate (55) is hinged on the side of the slider (54) away from the inner rod of the first spring telescopic rod (51); Two first deflection push plates (56) are hinged on the outer wall of the outer tube (52), and the two first deflection push plates (56) are arranged parallel to each other, the upper first deflection push plate (56) is hinged to one end of the deflection plate (55) away from the inner rod of the first spring telescopic rod (51), and the ends of the two first deflection push plates (56) away from the outer tube (52) are hinged to an L-shaped inner support plate (57); Two parallel second deflection push plates (58) are hingedly connected to the outer wall of the outer tube (52); an L-shaped clamping plate (59) is hingedly connected to one end of the two second deflection push plates (58) away from the outer tube (52); and a spring telescopic structure (6) is hingedly connected to the upper second deflection push plates (58); The spring telescopic structure (6) comprises a sliding rod (61) hinged on the second deflection push plate (58) on the upper side, two limiting tooth plates (62) are installed on the side of the sliding rod (61), and the two limiting tooth plates (62) are arranged back to back, an outer sleeve (63) is sleeved on one end of the sliding rod (61), and a second spring telescopic rod (64) is fixedly connected between the inner wall of the outer sleeve (63) and the sliding rod (61); One end of the sliding rod (61) is fixedly connected to a hook rod (65), and the hook rod (65) is on the upper side of the outer sleeve (63), and a locking member (7) is provided on the outer sleeve (63); The welding mechanism (8) comprises a motor (81) fixed on the outer sleeve of the first spring telescopic rod (51), the motor (81) is connected to a one-way bearing (82) through a belt drive, and the one-way bearing (82) is rotatably sleeved on the outer sleeve of the first spring telescopic rod (51), a transverse hydraulic cylinder (83) is fixedly connected to the outer wall of the outer ring of the one-way bearing (82), the lower end of the transverse hydraulic cylinder (83) is fixedly connected to a longitudinal hydraulic cylinder (84), and the lower end of the longitudinal hydraulic cylinder (84) is rotatably connected to a plasma welding machine (85); Two L-shaped connecting rods (86) are fixedly connected to the bottom surface of the inner ring of the one-way bearing (82), the L-shaped connecting rods (86) are parallel to the first spring telescopic rod (51), and one end of the two L-shaped connecting rods (86) away from the one-way bearing (82) is fixedly connected to an arc-shaped rod (87), both ends of the arc-shaped rod (87) are conical, and an extrusion rod (88) is fixedly connected to the arc-shaped rod (87), and the extrusion rod (88) is in a "J" shape, and the extrusion rod (88) is on the inner side of the hook rod (65).

2. The plasma welding device for raising the furnace cover of a single crystal furnace according to claim 1 is characterized in that: The locking member (7) comprises an inverted U-shaped rod (71) sliding on the outside of the outer sleeve (63), both ends of the inverted U-shaped rod (71) are inclined surfaces, both ends of the inverted U-shaped rod (71) are overlapped with an L-shaped clamping rod (72), the L-shaped clamping rod (72) and the outer sleeve (63) are parallel to each other, and the L-shaped clamping rod (72) is hinged on the outer sleeve (63), one end of the L-shaped clamping rod (72) abuts against two limit tooth plates (62), and a return spring (73) is fixedly connected between the other end of the L-shaped clamping rod (72) and the outer sleeve (63).

3. The plasma welding device for raising the furnace cover of a single crystal furnace according to claim 2 is characterized in that: The first spring telescopic rod (51) is fixedly connected with a locking mechanism (9), the locking mechanism (9) comprising a C-shaped hook plate (91) on the outer sleeve of the first spring telescopic rod (51), the inner side of the C-shaped hook plate (91) abuts against a C-shaped clamping plate (92), and the top surface of the C-shaped clamping plate (92) is fixedly connected with a first right-angled triangle block (93), the interior of the C-shaped clamping plate (92) is fixedly connected with a second right-angled triangle block (94), and the inclined surfaces of the second right-angled triangle block (94) and the first right-angled triangle block (93) face in opposite directions; The left and right sides of the C-shaped clamping plate (92) are both fixedly connected with a return spring telescopic rod (95), and one end of the return spring telescopic rod (95) away from the C-shaped clamping plate (92) is fixed on the outer wall of the outer tube (52).

4. The plasma welding device for raising the furnace cover of a single crystal furnace according to claim 3 is characterized in that: Four vertical rods (10) are fixedly connected to the lower end surface of the outer sleeve of the first spring telescopic rod (51), and the vertical rods (10) slide in vertical grooves provided on the outer wall of the outer tube (52). Two inclined surface extrusion blocks (11) are fixedly connected to the vertical rods (10), and the inclined surface extrusion blocks (11) abut against a fan-shaped tooth plate (12). The fan-shaped tooth plate (12) is hinged on the outer wall of the outer tube (52), and the fan-shaped tooth plate (12) also abuts against a limit tooth block (13), and the limit tooth block (13) is fixed on the first deflection push plate (56).

5. The method for using the plasma welding device for raising the furnace cover of a single crystal furnace according to claim 4 is characterized in that: The steps include: S1: firstly place the single crystal furnace cover on the placement rack (2), then place the expansion tube on the port of the single crystal furnace cover, and then drive the outer tube (52) to be inserted into the interior of the single crystal furnace cover by extending the cylinder (4), and then as the cylinder (4) continues to extend, the outer tube (52) contacts the placement rack (2), and at this time, the inner rod of the first spring telescopic rod (51) slides downward in the outer tube (52), driving the deflection plate (55) on the slider (54) to deflect, and cooperates with the first deflection push plate (56) to push the L-shaped inner support plate (57) to move parallel to the side away from the outer tube (52), so that the four L-shaped inner support plates (57) are supported inside the cover of the single crystal furnace cover; When the cylinder (4) is extended, the outer sleeve of the first spring telescopic rod (51) moves downward to drive the outer sleeve (63) to deflect, and cooperates with the sliding rod (61) to squeeze the second deflection push plate (58) to deflect, so that the four L-shaped clamping plates (59) are simultaneously expanded and supported in parallel inside the increased tube, so that the central axis of the increased tube is coaxial with the central axis of the single crystal furnace cover, and the single crystal furnace cover and the increased tube are fixed, so that the two can be welded later; S2: As the first spring telescopic rod (51) continues to move downward, the C-shaped hook plate (91) is driven to move downward to squeeze the first right-angle triangle block (93), so that the first right-angle triangle block (93) drives the C-shaped clamping plate (92) to move counterclockwise and then reset, thereby restricting the C-shaped hook plate (91) after the downward movement; Then, the lengths of the horizontal hydraulic cylinder (83) and the longitudinal hydraulic cylinder (84) are adjusted so that the plasma welding machine (85) on the longitudinal hydraulic cylinder (84) is aligned with the welding seam between the single crystal furnace cover and the outer side of the increased tube, and then the motor (81) is started to drive the one-way bearing (82) to rotate clockwise, and the plasma welding machine (85) is used to weld the welding seam between the single crystal furnace cover and the outer side of the increased tube; S3: When it is necessary to weld the welding seam between the single crystal furnace cover and the inner side of the increased tube, the plasma welding machine (85) is aligned with the welding seam between the single crystal furnace cover and the inner side of the increased tube by adjusting the extension length of the horizontal hydraulic cylinder (83) and the longitudinal hydraulic cylinder (84), and then the one-way bearing (82) is driven by the motor (81) to rotate counterclockwise, so that the L-shaped connecting rod (86) on the lower end surface of the one-way bearing (82) drives the arc rod (87) and the extrusion rod (88) to rotate counterclockwise at the same time, and at this time, one end of the arc rod (87) extrudes the first end of the arc rod (87) in the counterclockwise direction. An inverted U-shaped rod (71) is formed, so that the inverted U-shaped rod (71) moves downward to squeeze the L-shaped clamping rod (72) to deflect, thereby releasing the locking state of the L-shaped clamping rod (72) on the sliding rod (61) and the outer sleeve (63). Then, as the squeezing rod (88) rotates counterclockwise, the squeezing hook rod (65) moves upward, driving the sliding rod (61) to slide in the outer sleeve (63), so that the L-shaped clamping plate (59) at the end of the second deflection push plate (58) is separated from the inner wall of the increased tube, ensuring that the distance between the L-shaped clamping plate (59) and the inner wall of the increased tube is sufficient for the longitudinal hydraulic cylinder (84) to pass through; After the longitudinal hydraulic cylinder (84) passes through the first L-shaped clamping plate (59) and the increased tube in the counterclockwise direction, the arc rod (87) continues to squeeze the hook rod (65) in the counterclockwise direction in sequence, ensuring that the plasma welding machine (85) at the lower end of the longitudinal hydraulic cylinder (84) can fit the welding seam between the single crystal furnace cover and the inner side of the increased tube and rotate for one circle for welding.

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