Connector and butt joint tool for mineral insulated heating cable maintenance

Abstract

The invention relates to the technical field of electric heating elements, in particular to a connecting joint for mineral insulated heating cable maintenance and a butt joint tool. Comprising a first sleeve shell; the second sleeve shell is slidably connected to the inner wall of the first sleeve shell; and the sliding sleeve penetrates through the interiors of the first sleeve shell and the second sleeve shell in a sliding mode, and a closed space is defined by the outer wall of the sliding sleeve and the inner walls of the first sleeve shell and the second sleeve shell. Through cooperative use of the first sleeve shell, the second sleeve shell and the sliding sleeve, effective filling of magnesium oxide powder in the mineral insulation heating cable joint can be achieved, in the operation process, the sliding sleeve firstly keeps the magnesium oxide powder in a closed space not to fall off, and after the sliding sleeve is pulled out, the magnesium oxide powder in the closed space does not fall off. The size of the closed space can be effectively reduced by pushing the first sleeve shell and the second sleeve shell to be close to each other, so that the magnesium oxide powder can be tightly filled between magnesium oxide insulating materials between the two cable bodies and is further compacted under the action of the vibration assembly.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating elements, in particular to a connection joint and a butt joint tool for repairing a mineral insulated heating cable. Background Art

[0002] Mineral insulated heating cables have been widely used in industrial heating, building heating and other fields due to their excellent high temperature resistance, fire resistance and excellent mechanical strength. However, with the increase in service life or accidental damage, the maintenance and joint processing of mineral insulated heating cables has become an important but complex task. At present, there are two main ways to process the joints of mineral insulated heating cables, but each of them has obvious technical challenges and limitations.

[0003] The first method involves welding the heating wire at the connection part using oxygen welding technology and encapsulating the welding point in a metal sleeve. The sleeve and the cable sheath are made of stainless steel. Although this method provides a certain degree of safety and reliability, due to its structural characteristics, this joint is only suitable for environments with an operating temperature not exceeding 150°C. For applications that require working at higher temperatures, this joint solution is obviously not applicable, thus limiting its possibility of widespread application.

[0004] The second common way to handle joints is to use magnesium oxide powder filling technology, which is completed by tightening the threads at both ends and finally using argon arc welding. First, the joint must be accurately installed on the cable end, and then the magnesium oxide powder is filled inside the joint. During this process, in order to ensure that the magnesium oxide powder can tightly wrap the conductor, it is usually necessary to manually knock the joint to help the magnesium oxide powder settle and compact naturally. However, this process is not only time-consuming and labor-intensive, but also this filling method will cause the magnesium oxide powder to be filled not firmly enough, and it is easy to form gaps inside. These gaps will cause bloating due to gas expansion during the subsequent welding process. At the same time, the magnesium oxide powder that is not fully compacted may spray out during welding, causing safety hazards. Summary of the invention

[0005] In view of this, the present invention provides a connecting joint and a docking tool for repairing mineral insulated heating cables, which can overcome the disadvantages of existing magnesium oxide powder filled joints that, when in use, they need to be manually filled with magnesium oxide powder and the joints need to be knocked to allow the magnesium oxide powder to naturally settle and compact, which is not only time-consuming and labor-intensive, but also this filling method will cause the magnesium oxide powder to be filled not firmly enough, thus affecting subsequent welding work.

[0006] The technical solution is: a connection joint for repairing a mineral insulated heating cable, comprising: a first shell; a second shell, slidably connected to the inner wall of the first shell; a sliding sleeve, slidingly passing through the first shell and the second shell, and a closed space is formed between the outer wall of the sliding sleeve and the inner wall of the first shell and the second shell, and magnesium oxide powder is filled in the closed space. When the first shell and the second shell are respectively sleeved on the outside of the stainless steel sheaths of the two cable bodies, the sliding sleeve is slid out, and then the first shell and the second shell are pushed toward each other to reduce the volume in the closed space, so that the magnesium oxide powder in the closed space is filled between the magnesium oxide insulating materials of the two cable bodies, and the first shell and the second shell can compact the magnesium oxide powder; a limiting ring, connected to the end of the sliding sleeve, is used to limit the sliding sleeve.

[0007] The present invention also provides a docking tool for connecting joints for repairing mineral insulated heating cables, which also includes: a mounting plate; a guide rail connected to the top of the mounting plate; a sliding seat symmetrically slidably connected to the guide rail; a fixed shell connected to the upper end of the sliding seat; a rotating shell rotatably connected to the side of the sliding seat, and the rotating shell is in contact with the fixed shell; an arc-shaped plug plate, respectively connected to the inner walls of the fixed shell and the rotating shell; a clamping block connected to the top of the fixed shell; an elastic clamping rod connected to the top of the rotating shell, and the end of the elastic clamping rod can be clamped on the clamping block; a moving component arranged at the top of the mounting plate, used to drive the sliding seat to move; a vibration component arranged at the bottom of the mounting plate, used to drive the mounting plate to vibrate.

[0008] As an improvement of the above scheme, the moving component includes: a driving motor installed on the top of the mounting plate; a bidirectional screw rod rotatably connected to the guide rail, and the end of the bidirectional screw rod is connected to the output shaft of the driving motor, and two sliding seats are both threadedly connected to the bidirectional screw rod.

[0009] As an improvement of the above solution, the vibration component includes: a base plate, which is arranged below the mounting plate; a connecting spring, whose two ends are respectively connected to the top of the base plate and the bottom of the mounting plate; and a vibration motor, which is symmetrically installed on the top of the mounting plate.

[0010] As an improvement of the above scheme, it also includes: a sliding iron block, symmetrically slidably connected to the bottom plate; a U-shaped clamping plate, connected to the top of the sliding iron block, and the U-shaped clamping plate is used to lock the mounting plate; a first magnet, symmetrically connected to the bottom plate, and the first magnet attracts the sliding iron block through magnetic force; a second magnet, symmetrically connected to the bottom plate, and the sliding iron block is located between the first magnet and the second magnet.

[0011] As an improvement of the above scheme, it also includes: a support rod, symmetrically connected to the top of the mounting plate; a baffle, connected to the top of the support rod, and the baffle is above the bidirectional screw rod, the baffle is symmetrically opened with a slotted hole, and the sliding seat slides in the slotted hole; a T-shaped sleeve, slidably connected to the sliding seat; conical blocks, evenly spaced and connected to the bottom of the T-shaped sleeve; a baffle cloth, placed on the top of the baffle, and the baffle cloth covers the top of the slotted hole, and the bottom of the conical block is in contact with the top of the baffle cloth.

[0012] As an improvement of the above scheme, it also includes: a fixed clamp; a rotating clamp, which is rotatably connected to the fixed clamp, and the rotating clamp and the fixed clamp cooperate to clamp the heating element of the cable body, and a square hole is opened on the rotating clamp; a spring, whose two ends are respectively connected to the fixed clamp and the side of the rotating clamp; a screw, which is rotatably connected to the top of the fixed clamp, and the screw passes through the square hole; a screw sleeve, which is slidably connected in the square hole, and the screw sleeve is threadedly connected to the screw.

[0013] As an improvement of the above scheme, it also includes: a connecting ring, which is used to be sleeved on the outside of the stainless steel sheath of the cable body; a connecting rod, which is circumferentially connected to the outer wall of the connecting ring at intervals, and the end of the connecting rod is welded to the first shell or the second shell.

[0014] The present invention has the following advantages: 1. The present invention can realize effective filling of magnesium oxide powder inside the mineral insulated heating cable joint through the coordinated use of the first shell, the second shell and the sliding sleeve. During operation, the sliding sleeve first keeps the magnesium oxide powder in the closed space from falling. When the sliding sleeve is pulled out, the volume of the closed space can be effectively reduced by pushing the first shell and the second shell closer to each other, so that the magnesium oxide powder can be tightly filled between the magnesium oxide insulating materials between the two cable bodies, and further compacted with the help of the vibration component. The whole operation process is relatively simple, and can avoid the problems of uneven filling and internal gaps caused by traditional manual knocking methods.

[0015] 2. The present invention can clamp and fix the heating elements of the two cable bodies through the cooperation of the fixed clamping plate and the rotating clamping plate, thereby ensuring the precise alignment of the ends of the two heating elements. At the same time, through the cooperation of the sliding iron block, the U-shaped clamping plate, the first magnet and the second magnet, the mounting plate can be locked during the welding process of the first shell and the second shell, thereby ensuring the stability of the first shell and the second shell and ensuring the welding quality.

[0016] 3. The present invention can strengthen the connection strength between the stainless steel sheath of the cable body and the first shell or the second shell through the design of the connecting ring and the connecting rod, and prevent damage caused by mechanical stress. At the same time, the straight hole set on the baffle and the baffle cloth covering it can effectively prevent welding slag from entering key components such as the bidirectional screw during welding, protect the equipment from welding slag contamination, extend the service life of the equipment, and ensure the smooth progress of subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the first housing, the second housing, the sliding sleeve and the limiting ring of the present invention.

[0018] Figure 2 It is a cross-sectional view of the first housing, the second housing, the sliding sleeve and the limiting ring of the present invention.

[0019] Figure 3 It is a schematic diagram of the installation of the mounting plate, guide rail, sliding seat, fixed shell and rotating shell of the present invention.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure when the rotating shell of the present invention is opened.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the rotating shell of the present invention when it is closed.

[0022] Figure 6 It is a schematic diagram of the installation of the vibration component of the present invention.

[0023] Figure 7 The figure is a schematic diagram of the installation of the sliding iron block, the U-shaped clamping plate, the first magnet and the second magnet of the present invention.

[0024] Figure 8 The figure is a schematic diagram of the installation of the support rod, baffle plate, T-shaped sliding sleeve and baffle cloth of the present invention.

[0025] Fig. 9 It is a schematic diagram of the separation structure of the baffle plate, T-shaped sliding sleeve and baffle cloth of the present invention.

[0026] Fig.10 The figure is a schematic diagram of the installation of the fixed clamping plate, the rotating clamping plate, the spring piece, the screw rod and the screw sleeve of the present invention.

[0027] Fig.11 It is a schematic diagram of the separation structure of the fixed clamping plate and the rotating clamping plate of the present invention.

[0028] Fig.12 It is a schematic diagram of the installation of the connecting ring and the connecting rod of the present invention.

[0029] Names of the symbols in the figure: 1. Cable body, 101. Stainless steel sheath, 102. Magnesium oxide insulation material, 103. Heating element, 2. First shell, 3. Second shell, 4. Sliding sleeve, 5. Limiting ring, 6. Mounting plate, 7. Guide rail, 8. Sliding seat, 9. Fixed shell, 10. Rotating shell, 11. Arc plug-in plate, 12. Block, 13. Elastic clamping rod, 14. Driving motor, 15. Bidirectional screw rod, 16. Bottom plate, 17 , connecting spring, 18, vibration motor, 19, sliding iron block, 20, U-shaped clamping plate, 21, first magnet, 22, second magnet, 23, support rod, 24, baffle, 2401, slotted hole, 25, T-shaped sliding sleeve, 2501, conical block, 26, cloth stop, 27, fixed splint, 2801, square hole, 28, rotating splint, 29, spring piece, 30, screw, 31, screw sleeve, 32, connecting ring, 33, connecting rod. DETAILED DESCRIPTION

[0030] 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 technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment: A mineral insulated heating cable maintenance connection joint and docking tool, such as Figure 1 and Figure 2As shown, it includes a first shell 2, a second shell 3, a sliding sleeve 4 and a limiting ring 5. The first shell 2 is slidably connected to the second shell 3 on the right side. The left and right ends of the first shell 2 and the second shell 3 are both open-type designs. The first shell 2 and the second shell 3 are both made of stainless steel. The sliding sleeve 4 slides through the first shell 2 and the second shell 3, and the outer wall of the sliding sleeve 4 and the inner wall of the first shell 2 and the second shell 3 form a closed space. The closed space is filled with magnesium oxide powder. When the sliding sleeve 4 is sleeved on the outside of the stainless steel sheaths 101 of the two cable bodies 1, the sliding sleeve 4 can be moved to the right and pulled out, so that the first shell 2 and the second shell 3 are respectively sleeved on the two cable bodies 1 When the first shell 2 and the second shell 3 are outside the stainless steel sheath 101, the first shell 2 and the second shell 3 are pushed toward each other, which can reduce the volume in the closed space so that the magnesium oxide powder in the closed space can be automatically filled between the magnesium oxide insulating materials 102 of the two cable bodies 1, and the first shell 2 and the second shell 3 can compact the magnesium oxide powder. The right end of the sliding sleeve 4 is connected to a limiting ring 5, which is used to limit the sliding sleeve 4. Under the action of the limiting ring 5, the sliding sleeve 4 can be prevented from moving to the left and separating from the first shell 2 and the second shell 3. The first shell 2, the second shell 3, the sliding sleeve 4 and the limiting ring 5 need to be sealed and packaged to prevent the magnesium oxide powder in the closed space from getting damp.

[0032] like Figure 3-6 As shown, it also includes a mounting plate 6, a guide rail 7, a sliding seat 8, a fixed shell 9, a rotating shell 10, an arc plug plate 11, a block 12, an elastic clamping rod 13, a moving component and a vibration component. The guide rail 7 is connected to the middle of the top of the mounting plate 6, and the sliding seat 8 is symmetrically slidably connected to the guide rail 7. The tops of the two sliding seats 8 are connected to the fixed shell 9, and the front upper parts of the two sliding seats 8 are rotatably connected to the rotating shell 10. The rotating shell 10 corresponds to the fixed shell 9 one by one and contacts each other. The inner walls of the two fixed shells 9 and the two rotating shells 10 are connected to the arc plug plates 11, and the thickness of the arc plug plates 11 is adapted to the thickness of the sliding sleeve 4. The tops of the two fixed shells 9 are connected to the blocks 12, and the tops of the two rotating shells 10 are connected to the elastic clamping rods 13, and the rear ends of the elastic clamping rods 13 can be stuck on the blocks 12 to limit the rotating shell 10. The moving component is used to drive the sliding seat 8 to move, and the vibration component is used to drive the mounting plate 6 to vibrate.

[0033] like Figure 3 As shown, the moving assembly includes a driving motor 14 and a bidirectional screw rod 15. The driving motor 14 is installed on the left side of the top of the mounting plate 6. The upper part of the guide rail 7 is rotatably connected to the bidirectional screw rod 15. The left end of the bidirectional screw rod 15 is connected to the output shaft of the driving motor 14. The lower parts of the two sliding seats 8 are both threadedly connected to the bidirectional screw rod 15.

[0034] like Figure 6As shown, the vibration assembly includes a base plate 16, a connecting spring 17 and a vibration motor 18. The base plate 16 is arranged directly below the mounting plate 6. A plurality of connecting springs 17 are evenly spaced and connected between the top of the base plate 16 and the bottom of the mounting plate 6. The vibration motor 18 is symmetrically installed on the left and right sides of the rear side of the top of the mounting plate 6.

[0035] Initially, the rotating shell 10 is in an open state; when the two cable bodies 1 need to be docked, the stainless steel sheaths 101 and the magnesium oxide insulating material 102 at the ends of the two cable bodies 1 are firstly peeled off to expose the heating elements 103 at the ends of the two cable bodies 1, and then the first shell 2, the second shell 3, the sliding sleeve 4 and the limiting ring 5 are taken out from the sealed packaging bag, and the sliding sleeve 4 is sleeved on the outside of the stainless steel sheath 101 of the left cable body 1, and then the heating elements 103 at the ends of the two cable bodies 1 can be aligned and welded to connect the heating elements 103 at the ends of the two cable bodies 1, and then the first shell 2, the second shell 3, the sliding sleeve 4 and the limiting ring 5 are moved to the right to make the heating elements 103 at the ends of the two cable bodies 1 The connection point of 103 is located in the sliding sleeve 4, and then the limiting ring 5 is moved to the right, so that the sliding sleeve 4 can be pulled out from the inside of the first shell 2 and the second shell 3, so that the first shell 2 and the second shell 3 are respectively sleeved on the outside of the stainless steel sheaths 101 of the two cable bodies 1, and the magnesium oxide powder in the closed space will fall on the outside of the stainless steel sheaths 101 of the two cable bodies 1. At this time, a small gap will be left between the stainless steel sheaths 101 and the first shell 2 and the second shell 3. Then the stainless steel sheaths 101 of the two cable bodies 1 can be moved into the two fixed shells 9 respectively, and then the rotating shell 10 is rotated upward to close. The rotating shell 10 can drive the elastic clamping rod 13 to rotate upward. When the elastic clamping rod 13 contacts the block 12, the elastic clamping rod 13 automatically Under the elastic action of the cable body, the rear end of the elastic clamping rod 13 can be stuck on the clamping block 12, so that the rotating shell 10 can be limited. At this time, the rotating shell 10 and the fixed shell 9 contact each other and are sleeved on the outside of the stainless steel sheath 101 of the cable body 1, and the arc plug-in plates 11 on the rotating shell 10 and the fixed shell 9 will also contact each other, and then the driving motor 14 is started, and the bidirectional screw rod 15 is driven by the driving motor 14 to rotate. The bidirectional screw rod 15 can drive the sliding seats 8 on the left and right sides to move toward the side close to each other, and the sliding seat 8 can drive the fixed shells 9, the rotating shell 10 and the arc plug-in plates 11 on the left and right sides to move toward the side close to each other, so that the arc plug-in plates 11 are inserted in the gap between the stainless steel sheath 101 and the first shell 2 and the second shell 3, so as to prevent magnesium oxide powder from entering from the above gap. When the inner walls of the fixed shell 9 and the rotating shell 10 contact the outer walls of the first shell 2 and the second shell 3, the fixed shell 9 and the rotating shell 10 will push the first shell 2 and the second shell 3 to move closer to each other, thereby reducing the volume inside the closed space, so that the magnesium oxide powder in the closed space can be automatically filled between the magnesium oxide insulating materials 102 of the two cable bodies 1. At the same time, the vibration motor 18 can be started, and the vibration motor 18 can drive the mounting plate 6 to vibrate at high frequency. The connecting spring 17 will deform adaptively to reduce the vibration transmitted to the bottom plate 16. The mounting plate 6 can drive the first shell 2 and the second shell 3 to vibrate at high frequency, so that the magnesium oxide powder can be tightly filled between the magnesium oxide insulating materials 102 of the two cable bodies 1.The first shell 2 and the second shell 3 can compact the magnesium oxide powder inside them, then turn off the vibration motor 18 and the drive motor 14, and weld the right end of the first shell 2 to the outer wall of the second shell 3, so that the first shell 2 and the second shell 3 are connected as a whole to prevent the first shell 2 and the second shell 3 from sliding relative to each other and causing the magnesium oxide powder inside to loosen, then bend the arc plug plate 11 upward to disengage from the block 12, and then turn the rotating shell 10 downward to open it, so that the rotating shell 10 is separated from the fixed shell 9, and then the stainless steel sheaths 101 of the two cable bodies 1 can be taken out from the fixed shell 9, and the first shell 2 and the stainless steel sheath 101 on the left are welded, and then the second shell 3 and the stainless steel sheath 101 on the right are welded to fix the first shell 2 and the second shell 3 on the stainless steel sheath 101 of the two cable bodies 1. The whole operation process is relatively simple, and it can prevent the formation of gaps inside the filled magnesium oxide powder, ensuring the safety of the subsequent welding process.

[0036] like Figure 7 As shown, it also includes a sliding iron block 19, a U-shaped card plate 20, a first magnet 21 and a second magnet 22. The left and right parts of the bottom plate 16 are both symmetrically connected to the sliding iron blocks 19 in a front-to-back sliding manner. The number of the sliding iron blocks 19 is four. A U-shaped card plate 20 is connected between the tops of the two sliding iron blocks 19 on the front side, and a U-shaped card plate 20 is also connected between the tops of the two sliding iron blocks 19 on the rear side. The openings of the two U-shaped card plates 20 are both facing the mounting plate 6, and the upper and lower edges of the openings of the two U-shaped card plates 20 are both arc surfaces. The front and rear parts of the bottom plate 16 are both symmetrically connected to the first magnet 21, the first magnet 21 corresponds to the sliding iron block 19 one by one, and the first magnet 21 can absorb the corresponding sliding iron block 19 through magnetic force. Four second magnets 22 are symmetrically connected to the middle of the second magnet 22, the second magnet 22 corresponds to the sliding iron block 19 one by one, and the sliding iron block 19 is located between the first magnet 21 and the second magnet 22.

[0037] When welding the right end of the first shell 2 and the outer wall of the second shell 3, the U-shaped card plates 20 on the front and rear sides can be moved toward the side close to each other first. The U-shaped card plates 20 can drive the sliding iron blocks 19 on the front and rear sides to move toward the side close to each other, so that the sliding iron blocks 19 are separated from the first magnet 21. Then the U-shaped card plates 20 on the front and rear sides will be respectively stuck on the front and rear sides of the mounting plate 6. At the same time, the second magnet 22 can absorb the sliding iron block 19 through magnetic force, thereby fixing the positions of the sliding iron block 19 and the U-shaped card plates 20. The U-shaped card plates 20 can lock the mounting plate 6 to prevent the mounting plate 6 from shaking under the action of the connecting spring 17, thereby ensuring the stability of the first shell 2 and the second shell 3 during the welding process.

[0038] like Figure 8 and Fig. 9As shown, it also includes a support rod 23, a baffle 24, a T-shaped sleeve 25, a conical block 2501 and a blocking cloth 26. Four support rods 23 are symmetrically connected to the top of the mounting plate 6. A baffle 24 is connected between the tops of the four support rods 23, and the baffle 24 blocks the top of the bidirectional screw rod 15. The baffle 24 is symmetrically opened with a straight hole 2401, and two sliding seats 8 slide in the two straight holes 2401 respectively. The two sliding seats 8 are both slidably connected with a T-shaped sleeve 25, and the bottoms of the two T-shaped sleeves 25 are connected with multiple conical blocks 2501 from front to back. A blocking cloth 26 is placed on the top of the baffle 24, and the blocking cloth 26 covers the top of the straight hole 2401. The blocking cloth 26 is made of high temperature resistant material, and the bottom of each conical block 2501 is in contact with the top of the blocking cloth 26.

[0039] When the sliding seats 8 on the left and right sides move toward each other, the sliding seats 8 can drive the left and right ends of the blocking cloth 26 to move toward each other through the T-shaped sliding sleeve 25 and the conical block 2501, and the middle part of the blocking cloth 26 will arch upward; when welding between the right end of the first shell 2 and the outer wall of the second shell 3, the baffle 24 can prevent welding slag from falling on the bidirectional screw rod 15, and the blocking cloth 26 can prevent welding slag from falling on the bidirectional screw rod 15 through the straight hole 2401 on the baffle 24. Ensure that the sliding seat 8 can move smoothly along the bidirectional screw rod 15. When the sliding seats 8 on the left and right sides move to the side away from each other and reset, the sliding seat 8 can drive the left and right ends of the blocking cloth 26 to move to the side away from each other and reset through the T-shaped sliding sleeve 25 and the conical block 2501, so that the blocking cloth 26 returns to its original state. When the blocking cloth 26 needs to be replaced, the T-shaped sliding sleeve 25 can be moved upward to drive the conical block 2501 to move upward and separate from the blocking cloth 26, and then the blocking cloth 26 can be replaced.

[0040] like Fig.10 and Fig.11 As shown, it also includes a fixed clamping plate 27, a rotating clamping plate 28, a spring piece 29, a screw 30 and a screw sleeve 31. The front part of the fixed clamping plate 27 is rotatably connected to the rotating clamping plate 28, and the rotating clamping plate 28 cooperates with the fixed clamping plate 27 to clamp the heating element 103 of the cable body 1. A square hole 2801 is opened in the middle of the rotating clamping plate 28. A spring piece 29 is connected between the left side of the fixed clamping plate 27 and the left side of the rotating clamping plate 28. A spring piece 29 is also connected between the right side of the fixed clamping plate 27 and the right side of the rotating clamping plate 28. A screw 30 is rotatably connected to the middle of the top of the rotating clamping plate 28, and the screw 30 passes through the square hole 2801. A screw sleeve 31 is slidably connected in the square hole 2801. The shape of the screw sleeve 31 is T-shaped, and the screw sleeve 31 is threadedly connected to the screw 30.

[0041] Initially, the upper part of the screw sleeve 31 presses the top of the rotating clamping plate 28, and the spring piece 29 is in a deformed state; when it is necessary to weld the heating elements 103 at the ends of the two cable bodies 1, first rotate the screw rod 30, the screw rod 30 can drive the screw sleeve 31 to move upward, so that the screw sleeve 31 no longer presses the top of the rotating clamping plate 28, and the spring piece 29 will return to its original state, driving the rotating clamping plate 28 to rotate upward and open, and then the heating elements 103 at the ends of the two cable bodies 1 can be manually placed on the fixed clamping plate 27, and then the screw rod 30 is reversed. 0, the screw rod 30 can drive the screw sleeve 31 to move downward, the screw sleeve 31 will squeeze the rotating clamping plate 28 to rotate downward and close, the spring piece 29 will be deformed, and the fixed clamping plate 27 and the rotating clamping plate 28 can cooperate to clamp the heating elements 103 at the ends of the two cable bodies 1, ensuring that the heating elements 103 at the ends of the two cable bodies 1 are in an aligned state, and can also prevent the heating elements 103 at the ends of the cable body 1 from moving, and at the same time can ensure the coaxiality of the heating elements 103 at the ends of the two cable bodies 1, which is convenient for subsequent welding work.

[0042] like Fig.12 As shown, it also includes a connecting ring 32 and a connecting rod 33. The connecting ring 32 is used to be sleeved on the outside of the stainless steel sheath 101 of the cable body 1. The outer wall of the connecting ring 32 is circumferentially spaced to connect multiple connecting rods 33, and the ends of the connecting rods 33 can be welded to the first shell 2 or the second shell 3.

[0043] Before welding the heating elements 103 at the ends of the two cable bodies 1, the two connecting rings 32 can be respectively put on the outside of the stainless steel sheaths 101 of the two cable bodies 1; after the first shell 2 and the second shell 3 are respectively welded to the stainless steel sheaths 101 of the two cable bodies 1, the connecting rings 32 on the left and right sides can be moved toward each other, and the connecting rings 32 can drive the connecting rods 33 on the left and right sides to move toward each other, so that the connecting rods 33 on the left and right sides are respectively in contact with the outer walls of the first shell 2 and the second shell 3, and then the connecting rods 33 on the left and right sides are respectively welded to the first shell 2 and the second shell 3, so as to prevent the stainless steel sheath 101 of the cable body 1 from bending and breaking at the welding points with the first shell 2 and the second shell 3.

[0044] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mineral insulated heating cable maintenance connection joint, characterized in that it comprises: a first shell (2); a second shell (3) slidably connected to the inner wall of the first shell (2); a sliding sleeve (4) slidably penetrating the first shell (2) and the second shell (3), and a closed space is enclosed between the outer wall of the sliding sleeve (4) and the inner walls of the first shell (2) and the second shell (3), wherein magnesium oxide powder is contained in the closed space. When the first shell (2) and the second shell (3) are respectively sleeved on the two cable bodies ( 1), the sliding sleeve (4) is slid and pulled out, and then the first shell (2) and the second shell (3) are pushed toward each other to reduce the volume of the closed space, so that the magnesium oxide powder in the closed space is filled between the magnesium oxide insulating materials (102) of the two cable bodies (1), and the first shell (2) and the second shell (3) can compact the magnesium oxide powder; a limiting ring (5) is connected to the end of the sliding sleeve (4) and is used to limit the sliding sleeve (4).

2. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 1, characterized in that: The invention also comprises: a mounting plate (6); a guide rail (7) connected to the top of the mounting plate (6); a sliding seat (8) symmetrically slidably connected to the guide rail (7); a fixed shell (9) connected to the upper end of the sliding seat (8); a rotating shell (10) rotatably connected to the side of the sliding seat (8), and the rotating shell (10) is in contact with the fixed shell (9); an arc-shaped plug plate (11) respectively connected to the inner wall of the fixed shell (9) and the rotating shell (10); a clamping block (12) connected to the top of the fixed shell (9); an elastic clamping rod (13) connected to the top of the rotating shell (10), and the end of the elastic clamping rod (13) can be clamped on the clamping block (12); a moving component arranged at the top of the mounting plate (6) and used to drive the sliding seat (8) to move; and a vibration component arranged at the bottom of the mounting plate (6) and used to drive the mounting plate (6) to vibrate.

3. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 2, characterized in that: The moving assembly comprises: a driving motor (14) mounted on the top of the mounting plate (6); a bidirectional screw rod (15) rotatably connected to the guide rail (7), and the end of the bidirectional screw rod (15) is connected to the output shaft of the driving motor (14); and two sliding seats (8) are both threadedly connected to the bidirectional screw rod (15).

4. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 3, characterized in that: The vibration assembly comprises: a base plate (16) disposed below the mounting plate (6); a connecting spring (17) having two ends respectively connected to the top of the base plate (16) and the bottom of the mounting plate (6); and a vibration motor (18) symmetrically mounted on the top of the mounting plate (6).

5. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 4, characterized in that: The invention also comprises: a sliding iron block (19) symmetrically slidably connected to the bottom plate (16); a U-shaped clamping plate (20) connected to the top of the sliding iron block (19), the U-shaped clamping plate (20) being used to lock the mounting plate (6); a first magnet (21) symmetrically connected to the bottom plate (16), and the first magnet (21) adsorbs the sliding iron block (19) by magnetic force; and a second magnet (22) symmetrically connected to the bottom plate (16), the sliding iron block (19) being located between the first magnet (21) and the second magnet (22).

6. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 5, characterized in that: The invention also comprises: a support rod (23) symmetrically connected to the top of the mounting plate (6); a baffle (24) connected to the top of the support rod (23), and the baffle (24) blocks the top of the bidirectional screw rod (15), and a slotted hole (2401) is symmetrically opened on the baffle (24), and the sliding seat (8) slides in the slotted hole (2401); a T-shaped sliding sleeve (25) slidably connected to the sliding seat (8); a conical block (2501) connected to the bottom of the T-shaped sliding sleeve (25) at even intervals; and a baffle cloth (26) placed on the top of the baffle plate (24), and the baffle cloth (26) covers the top of the slotted hole (2401), and the bottom of the conical block (2501) contacts the top of the baffle cloth (26).

7. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 6, characterized in that: The cable body (1) further comprises: a fixed clamping plate (27); a rotating clamping plate (28) rotatably connected to the fixed clamping plate (27), and the rotating clamping plate (28) cooperates with the fixed clamping plate (27) to clamp the heating element (103) of the cable body (1), and a square hole (2801) is opened on the rotating clamping plate (28); a spring piece (29) with two ends respectively connected to the side of the fixed clamping plate (27) and the rotating clamping plate (28); a screw rod (30) rotatably connected to the top of the fixed clamping plate (27), and the screw rod (30) passes through the square hole (2801); and a screw sleeve (31) slidably connected in the square hole (2801), and the screw sleeve (31) is threadedly connected to the screw rod (30).

8. A butt joint tool for a mineral insulated heating cable repair connection joint according to claim 7, characterized in that: It also includes: a connecting ring (32) used to be sleeved on the outside of the stainless steel sheath (101) of the cable body (1); connecting rods (33) connected to the outer wall of the connecting ring (32) at circumferential intervals, and the ends of the connecting rods (33) are welded to the first shell (2) or the second shell (3).

Images