A high power cement resistor for frequency converters and a method of processing

Abstract

The application relates to a high-power cement resistor for a frequency converter and a processing method. When assembled, the cover body is first covered on the top of the shell body, the position of the cover body is adjusted, the flexible resistor strip is clamped between the traction column and the column array, and the traction column and the positioning hole are aligned, so that the end of the traction column away from the cover body is embedded in the positioning hole. At this time, when the traction column is subjected to a lateral force, the connection between the traction column and the cover body and the connection between the traction column and the traction seat will simultaneously generate stress, without generating a rotating torque, thereby reducing the risk of fracture of the traction column.

Description

Technical Field

[0001] This application relates to the field of vehicle-mounted soft-start resistors, and in particular to a high-power cement resistor for frequency converters and a method for its fabrication. Background Technology

[0002] A cement resistor is a type of resistor made by winding resistance wire around an alkali-free, heat-resistant ceramic core, protecting and fixing it with a heat-resistant, moisture-resistant, and corrosion-resistant material, placing the wound resistor body inside a square ceramic frame, and then filling and sealing it with special non-combustible, heat-resistant cement. Cement resistors can be used in applications with high current, such as in series with an electric motor, to limit the motor's starting current; their resistance value is generally not high.

[0003] The applicant's patent application, publication number CN113782284A, discloses a high-power cement resistor for frequency converters. During processing, this cement resistor utilizes the relative movement between a guide post and a limiting post to compress a flexible resistor strip, thus effectively utilizing the space within the accommodating square groove. However, the applicant discovered that in actual production, because one end of the guide post is fixedly connected to the cover, significant stress is generated at the connection between the guide post and the cover when the guide post pulls the flexible resistor strip. This can easily lead to the guide post breaking, rendering both the flexible resistor strip and the cover unusable. Summary of the Invention

[0004] To improve heat dissipation, this application provides a high-power cement resistor for frequency converters and a processing method thereof.

[0005] In a first aspect, this application provides a high-power cement resistor for frequency converters, employing the following technical solution:

[0006] A high-power cement resistor for a frequency converter includes a housing with a accommodating square groove at the top, a flexible resistor strip installed within the accommodating square groove, a traction cover mounted on the top of the housing, and a traction seat mounted at the bottom of the housing. The accommodating square groove contains a serpentine array of columns, each column comprising several columns and support columns connecting the ends of adjacent columns. The support columns are located at the turning points of the column array and are composed of several spaced-apart limiting columns. The flexible resistor strip abuts against one side of the column array. The traction cover includes a cover body and several traction columns located at the bottom of the cover body. The traction columns are located between adjacent limiting columns within each column array and can move between adjacent limiting columns. The traction columns abut against the flexible resistor strip and cooperate with adjacent limiting columns to bend and tension the flexible resistor strip. The accommodating square groove is filled with fireproof putty. Adjacent columns are arranged in parallel, and the limiting columns of each column array combine to form a rectangular array. The bottom of the accommodating square groove has several traction grooves corresponding to the traction columns.

[0007] The traction seat is provided with positioning holes opposite to the traction groove. Each traction post corresponds to one of the positioning holes, and the end of the traction post is embedded in the positioning hole. The length of the traction post is greater than the sum of the depth of the accommodating square groove and the depth of the traction groove, and the length of the traction post is less than the sum of the depth of the accommodating square groove, the depth of the traction groove, and the depth of the positioning hole. (Torsion cover)

[0008] By adopting the above technical solution, during assembly, the cover can be placed on top of the housing and its position adjusted so that the flexible resistor strip is clamped between the traction column and the column array. Simultaneously, the traction column and the positioning hole are aligned, ensuring that the end of the traction column furthest from the cover is embedded in the positioning hole. At this point, when the traction column is subjected to lateral force, stress will be generated simultaneously at the connection between the traction column and the cover, and at the connection between the traction column and the traction seat, without generating a rotational torque, thus reducing the risk of the traction column breaking.

[0009] Due to the connecting action of the traction column, the cover and the traction seat are relatively fixed in the opening direction of the traction groove. At the same time, the traction column pushes the cover and the traction seat, and pushes the flexible resistance strip to slide along the traction groove, so that the flexible resistance strip bends and is tensioned, thereby increasing the length of the flexible resistance strip in the accommodating square groove and ensuring that the flexible resistance strip is in full contact with the fireproof putty.

[0010] Flexible resistor strips are typically made of metal with a smooth surface. They are wound between the support column and the traction column and tensioned, thus forming an S-shape. The flexible resistor strips within the housing are individually arranged and separated from each other. Fireproof putty ensures full contact between the flexible resistor strips for heat dissipation. Furthermore, through proper arrangement, the flexible resistor strips can be nested at the bends of adjacent columns, with the protruding surface of one column embedding into the concave surface of the adjacent column. This effectively utilizes the space within the accommodating slot, increasing the length of the flexible resistor strip within the slot. This allows it to withstand stronger currents and ensure better heat dissipation when used in frequency converters.

[0011] In summary, this high-power cement resistor for frequency converters can be easily manufactured with a high yield rate, and it also has good heat dissipation and high power resistance during use.

[0012] Optionally, the bottom of the cover is provided with a row of guide posts on both sides. The two rows of guide posts are parallel to each other and each row of guide posts includes two guide posts spaced apart. The top of the shell is provided with positioning grooves on both sides of the accommodating square groove. Each guide post is embedded in a different positioning groove. The depth of the positioning groove is adapted to the guide post.

[0013] By adopting the above technical solution, when the traction column slides in the traction groove, the guide column will slide synchronously until the traction column is embedded in the adjustment groove and the guide column is also embedded in the positioning groove, so that the cover abuts against the top surface of the shell.

[0014] Optionally, the width of the positioning groove is adapted to the guide post, the guide post slides in the positioning groove and is slidably connected to the positioning groove, and a grouting hole is provided on the outer side wall of the housing, the grouting hole passes through one end of the positioning groove and is connected to the receiving square groove.

[0015] Optionally, the number of grouting holes is four and they are evenly distributed on two opposite outer walls of the shell. The two ends of the positioning groove are the entry position and the fixed position, respectively. The entry position is the starting position for the guide column to slide into the positioning groove, and the grouting holes all pass through the fixed position.

[0016] By adopting the above technical solution, when the guide column just enters the positioning groove, the guide column is in the entry position, and the grouting hole is in a connected state. The cover abuts against the top of the shell and closes the opening of the receiving square groove, allowing fireproof mortar to be injected into the receiving square groove through the grouting hole. Since two of the grouting holes are located on one side of the flexible resistor strip, and the other two are located on the other side, when fireproof mortar is injected from one grouting hole on one side of the flexible resistor strip, air can be discharged from the other grouting hole on the same side. After injection is completed, the cover continues to slide, causing the traction column to reach the fixed position. At this time, the guide column blocks the grouting hole, preventing leakage.

[0017] Optionally, the top of the housing has a first guide groove on each of the opposite sides of the accommodating square groove for the guide post to be inserted and slid. The two first guide grooves are arranged in parallel. The positioning groove is located in the first guide groove and the depth of the first guide groove is less than the depth of the positioning groove.

[0018] By adopting the above technical solution, the first guide groove enables the traction cover to slide in a determined direction on the top of the housing, thereby allowing the flexible metal strip to bend better and enabling the guide post to accurately enter the positioning groove.

[0019] Optionally, the length of the traction column is greater than or equal to the depth of the positioning groove - the depth of the first guide groove + the thickness of the housing.

[0020] Optionally, a row of sliding columns is provided on both opposite sides of the top surface of the traction seat. The two rows of sliding columns are parallel to each other, and each row of sliding columns includes two sliding columns spaced apart. A second guide groove is provided on both opposite sides of the accommodating square groove at the bottom of the housing for the sliding columns to be inserted and slid. The two second guide grooves are arranged in parallel.

[0021] By adopting the above technical solution, the second guide groove enables the traction seat to slide in a determined direction at the bottom of the housing, thereby allowing the flexible metal strip to bend better and enabling the guide post to accurately enter the positioning groove.

[0022] Optionally, the first guide groove and the second guide groove are both square grooves, the guide post and the sliding post are square posts, the positioning groove is a square groove, and the width of the positioning groove is the same as the width of the guide groove.

[0023] By adopting the above technical solution, the guide post can slide smoothly on the first guide groove or the second guide groove.

[0024] Optionally, the side of the housing is provided with an outlet notch for the flexible resistor strip to be led out, and the outlet notch is used to fix and encapsulate the flexible resistor strip with epoxy resin.

[0025] By adopting the above technical solution, epoxy resin fixes the flexible resistor strip to the housing and seals the housing.

[0026] Secondly, this application provides a method for processing high-power cement resistors for frequency converters, employing the following technical solution:

[0027] A method for processing high-power cement resistors for frequency converters includes the following steps:

[0028] S1. Pass the flexible resistor strip through the lead-out notch, wrap it around the column and tension it on one side of the column;

[0029] S2. Align the sliding post with the second guide groove and insert it, and align the traction post with the positioning hole and insert it;

[0030] S3. Fix the housing and press the cover and traction seat against each other at the same time. Push the cover and traction seat along the opening direction of the first guide groove until the guide post moves to the end of the first guide groove. The traction post will be pushed along the traction groove and bend and tighten the flexible resistance strip. Adjust the flexible resistance strip to fill the receiving square groove from the lead-out notch.

[0031] S4. Press the guide post into the entry position of the positioning groove, and the traction post enters the adjustment groove, so that the cover abuts against the top surface of the housing;

[0032] S5. Inject refractory mortar into the receiving square groove from two grouting holes on opposite sides of the shell until the refractory mortar overflows from the other two grouting holes;

[0033] S6. Continue pushing the cover and traction seat so that the guide column slides to the fixed position of the positioning groove to block the grouting hole;

[0034] S7. Inject epoxy resin into the lead-out notch and the grouting hole to encapsulate the cement resistor. Attached Figure Description

[0035] Figure 1 This is an overall schematic diagram of a high-power cement resistor used in a frequency converter according to an embodiment of this application.

[0036] Figure 2 This is a schematic diagram illustrating the internal structure of a cement resistor by separating the housing, traction cover, and traction seat in an embodiment of this application.

[0037] Figure 3 This is a schematic diagram of the housing in an embodiment of this application.

[0038] Figure 4 This is a schematic diagram illustrating the internal structure of a high-power cement resistor behind a hidden traction cover in an embodiment of this application.

[0039] Figure 5 This is a schematic diagram of the structure of the cap in the embodiments of this application.

[0040] Figure 6 This is a schematic diagram of the structure of the high-power cement resistor in this embodiment of the application, used to illustrate the insertion of the guide post into the first guide groove after the cover is hidden.

[0041] Figure 7 This is a schematic diagram of the structure of the high-power cement resistor in the embodiment of this application, used to illustrate the guide post being embedded in the positioning groove and located in the fixed position behind the hidden part of the cover.

[0042] Figure 8 This is another schematic diagram of the housing in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Shell; 11. Accommodating square groove; 12. Column array; 121. Column row; 1210. Limiting column; 122. Support column; 13. Traction groove; 131. Starting end; 132. Ending end; 14. Adjustment groove; 15. Positioning groove; 151. Entry position; 152. Fixing position; 16. Grouting hole; 17. First guide groove; 18. Second guide groove; 19. Lead-out notch;

[0045] 2. Flexible resistor strip;

[0046] 3. Towing cover; 31. Cover body; 32. Towing post; 33. Guide post;

[0047] 4. Traction seat; 41. Positioning hole; 42. Sliding column. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-8 This application will be further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0049] In the following description, numerous specific details are set forth for purposes of explanation in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the accompanying drawings of this disclosure are block diagrams illustrating structures and devices to avoid complicating the disclosed principles. For clarity, not all features of the actual embodiment need to be described. Furthermore, the language used in this disclosure has been primarily chosen for readability and instructional purposes and may not have been chosen to define or limit the subject matter of the invention, thus requiring the necessary claims to determine such inventive subject matter. References to “an embodiment” or “an embodiment” in this disclosure mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment, and multiple references to “an embodiment” or “an embodiment” should not be construed as necessarily referring to the same embodiment.

[0050] Unless explicitly defined, the terms “a,” “an,” and “the” are not intended to refer to a singular entity, but rather to include a general category whose specific examples can be used for illustration. Therefore, the use of the terms “a” or “an” can mean any number of at least one, including “a,” “one or more,” “at least one,” and “one or more.” The term “or” means any of the options and any combination of the options, including all options unless explicitly indicated that the options are mutually exclusive. The phrase “at least one of” when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all items listed unless explicitly defined as such.

[0051] This application discloses a high-power cement resistor for use in frequency converters. (Refer to...) Figure 1 and Figure 2 The cement resistor includes a housing 1 with a accommodating square groove 11 at the top, a flexible resistor strip 2 installed in the accommodating square groove 11, a traction cover 3 installed at the top of the housing 1, and a traction seat 4 installed at the bottom of the housing 1. The traction cover 3 is used to close the opening of the accommodating square groove 11 and bend the flexible resistor strip 2. The accommodating square groove 11 is filled with fireproof mud.

[0052] Reference Figure 3 and Figure 4The accommodating square groove 11 contains a column array 12 arranged in a serpentine pattern. The column array 12 includes several column columns 121 and support columns 122 connecting the ends of adjacent column columns 121. Adjacent column columns 121 can be arranged parallel or inclined. In this embodiment, adjacent column columns 121 are parallel to each other and equally spaced. Each column column 121 is composed of several spaced-apart limiting columns 1210, with adjacent limiting columns 1210 being equidistant. In this embodiment, the limiting columns 1210 and the housing 1 are integrally formed from ceramic material. The length of the limiting columns 1210 is the same as the depth of the accommodating square groove 11, and the limiting columns 1210 of each column column 121 combine to form a rectangular array. The support column 122 is located at the turning point of the column array 12, that is, between the support columns 122 at the ends of two adjacent column arrays 121. In this embodiment, the support column 122 and the support columns 122 at the ends of the two adjacent column arrays 121 form a triangle, and the support column 122 is located outside the rectangular array formed by the combination of the column arrays 121. The support column 122 and the shell 1 are integrally fired from ceramic material, and the length of the support column 122 is less than or equal to the depth of the accommodating square groove 11. In this embodiment, the length of the support column 122 is equal to the depth of the accommodating square groove 11.

[0053] Reference Figure 4 and Figure 5 The traction cover 3 includes a traction cover 3, two rows of guide posts 33 disposed on opposite sides of the bottom surface of the traction cover 3, and a traction post 32 disposed in the middle of the bottom surface of the traction cover 3. The two rows of guide posts 33 are parallel to each other. Each row of guide posts 33 includes two guide posts 33 spaced apart. In this embodiment, the two guide posts 33 in the same row are close to the opposite ends of the traction cover 3. The top of the housing 1 has a first guide groove 17 on opposite sides of the accommodating square groove 11 for the guide posts 33 to slide into. The two first guide grooves 17 are parallel to each other, and the width of the first guide groove 17 is adapted to the guide post 33. The first guide groove 17 is a square groove, and the guide post 33 is a square post. When the guide post 33 is located in the first guide groove 17, the first guide groove 17 and the guide post 33 are slidably connected.

[0054] Reference Figure 3 and Figure 4The first guide groove 17 has several positioning grooves 15, the number of which is the same as the number of guide posts 33. The depth of the first guide groove 17 is less than the depth of the positioning grooves 15, and the opening direction of the positioning grooves 15 is the same as that of the first guide groove 17. Each positioning groove 15 corresponds to a guide post 33, and each guide post 33 is embedded in a different positioning groove 15. In this embodiment, the width of the positioning groove 15 is equal to the width of the first guide groove 17, and the width of the positioning groove 15 is adapted to the guide post 33. That is, the distance from the bottom of the positioning groove 15 to the top surface of the housing 1 is equal to the length of the guide post 33. When the bottom surface of the traction cover 3 abuts against the top surface of the housing 1, the guide post 33 located in the positioning groove 15 will abut against the bottom of the positioning groove 15. In particular, the positioning groove 15 is a square groove, and the guide post 33 is a square post. When the guide post 33 is located in the positioning groove 15, it is slidably connected to the positioning groove 15. The two ends of the positioning groove 15 are the entry position 151 and the fixed position 152, respectively. The entry position 151 is the starting position where the guide post 33 slides into the positioning groove 15, and the fixed position 152 is the end of the positioning groove 15 away from the entry position 151.

[0055] The outer side wall of the housing 1 is provided with four grouting holes 16, which are evenly distributed on two opposite outer side walls of the housing 1. The grouting holes 16 pass through the fixing position 152 and are connected to the receiving square groove 11.

[0056] Reference Figure 3 and Figure 4 Column 12 is a continuous queue, in which Figure 3 The dashed lines in the diagram are used to indicate the arrangement of the column array 12, which includes two continuous sides. The flexible resistor strip 2 is wound around the column array 12 and abuts against one side of the column array 12. The side of the housing 1 is provided with a lead-out notch 19 for the flexible resistor strip 2 to be led out. The lead-out notch 19 is used to fix and encapsulate the flexible resistor strip 2 with epoxy resin.

[0057] In the accommodating square groove 11, the length of the traction column 32 is greater than the depth of the accommodating square groove 11. (Refer to...) Figure 6 and Figure 7The traction post 32 is located between adjacent limiting posts 1210 within each column 121 and can move between adjacent limiting posts 1210. A plurality of traction grooves 13 corresponding to the traction post 32 are provided through the bottom of the accommodating square groove 11. The two ends of the traction groove 13 are a starting end 131 for embedding the traction post 32 and a ending end 132 for fixing the traction post 32, respectively. The traction groove 13 passes through the column 121, and the starting end 131 and the ending end 132 are located on opposite sides of the column 121. In this embodiment, the opening direction of each traction groove 13 is parallel to each other and perpendicular to the arrangement direction of the column 121. The width of the traction groove 13 is adapted to the traction post 32. When the traction post 32 is within the traction groove 13, the traction post 32 and the traction groove 13 are slidably connected. The traction post 32 abuts against the flexible resistor strip 2 and cooperates with the adjacent limiting posts 1210 to bend and tension the flexible resistor strip 2.

[0058] Reference Figure 2 The traction seat 4 is located at the bottom of the housing 1 and is a square plate adapted to the shape of the bottom surface of the housing 1. The traction seat 4 is provided with positioning holes 41 opposite to the traction groove 13. The traction column 32 corresponds one-to-one with the positioning holes 41, and the shape of the positioning holes 41 is adapted to the shape of the end of the traction column 32. During and after assembly, the end of the traction column 32 is embedded in the positioning hole 41. It should be noted that the length of the traction column 32 is greater than the depth of the accommodating square groove 11 plus the depth of the traction groove 13, the length of the traction column 32 is less than the depth of the accommodating square groove 11 plus the depth of the traction groove 13 plus the depth of the positioning hole 41, and the length of the traction column 32 is greater than or equal to the depth of the positioning groove 15 minus the depth of the first guide groove 17 plus the thickness of the housing 1.

[0059] Reference Figure 2 A row of sliding posts 42 is provided on both opposite sides of the bottom of the cover 31, and the two rows of sliding posts 42 are parallel to each other. Each row of sliding posts 42 includes two sliding posts 42 spaced apart. In this embodiment, the two sliding posts 42 in the same row are respectively close to the opposite ends of the traction seat 4. (Refer to...) Figure 8 The bottom of the housing 1 has a second guide groove 18 on each side of the accommodating square groove 11 for the sliding post 42 to be inserted and slid. The two second guide grooves 18 are arranged in parallel, and the width of the second guide groove 18 is adapted to the sliding post 42. The second guide groove 18 is a square groove, and the sliding post 42 is a square post. When the sliding post 42 is located in the second guide groove 18, the second guide groove 18 and the sliding post 42 are slidably connected.

[0060] Reference Figure 6 and Figure 7During assembly, the traction cover 3 can be placed on top of the housing 1 and its position adjusted so that the guide post 33 is embedded in the guide groove, and the traction post 32 and the positioning hole 41 are aligned simultaneously so that the end of the traction post 32 away from the cover 31 is embedded in the positioning hole 41. At this time, the flexible resistor strip 2 is clamped between the traction post 32 and the column 121, and there is a certain gap between the cover 31 and the housing 1, through which the state of the flexible resistor strip 2 inside the housing 1 can be observed. When the traction post 32 is subjected to lateral force, stress will be generated at the connection between the traction post 32 and the cover 31, and at the connection between the traction post 32 and the traction seat 4, instead of generating a rotational torque, thereby reducing the risk of the traction post 32 breaking.

[0061] Due to the connecting effect of the traction column 32, the cover 31 and the traction seat 4 are relatively fixed in the opening direction of the traction groove 13. Simultaneously, the cover 31 and the traction seat 4 are pushed. The first guide groove 17 guides the guide column 33, and the traction groove 13 guides the traction column 32. The guide column 33 slides along the first guide groove 17, and the traction column 32 slides along the traction groove 13. The traction column 32 pushes the flexible resistor strip 2 to slide along the traction groove 13, causing the flexible resistor strip 2 to bend and be tensioned, thus increasing the length of the flexible resistor strip 2 within the accommodating square groove 11. The flexible resistor strips 2 on adjacent columns 121 have similar bending shapes and corresponding positions, allowing the flexible resistor strips 2 to better nest at the bends of adjacent columns 121, thereby improving space utilization.

[0062] When the traction column 32 slides to the end 132 of the traction groove 13, it will be further embedded into the deeper part of the positioning hole 41. At the same time, when the guide column 33 slides to the entry position 151 of the positioning groove 15, it will be embedded in the positioning groove 15. At this time, the traction column 32 abuts against the bottom of the adjustment groove 14, the guide column 33 abuts against the bottom of the positioning groove 15, the bottom surface of the traction cover 3 abuts against the top surface of the housing 1, and the opening of the receiving square groove 11 is closed. When the guide column 33 just enters the positioning groove 15, the guide column 33 is located in the entry position 151. At this time, the grouting hole 16 is in a connected state, the traction cover 3 abuts against the top of the housing 1 and closes the opening of the receiving square groove 11, and the fireproof mud can be injected into the receiving square groove 11 from the grouting hole 16. Since two of the grouting holes 16 are located on one side of the flexible resistor strip 2 and the other two are located on the other side, when the fireproof mud is injected from one grouting hole 16 on one side of the flexible resistor strip 2, air can be discharged from the other grouting hole 16 on the same side. After injection, continue sliding the traction cover 3 until the traction column 32 reaches the fixed position 152. At this point, the guide column 33 blocks the grouting hole 16, preventing leakage. Finally, epoxy resin is injected into the lead-out notch 19 and then into the grouting hole 16, thereby encapsulating the cement resistor.

[0063] This application also discloses a method for processing high-power cement resistors for frequency converters, including the following steps:

[0064] S1. Pass the flexible resistor strip 2 through the lead-out notch 19, wrap it around the column 12 and tension it on one side of the column 12;

[0065] S2. Align the sliding post 42 with the second guide groove 18 and insert it, and align the traction post 32 with the positioning hole 41 and insert it;

[0066] S3. Fix the housing 1 and press the cover 31 and the traction seat 4 against each other. Push the cover 31 and the traction seat 4 along the opening direction of the first guide groove 17 until the guide post 33 moves to the end of the first guide groove 17. The traction post 32 will push and bend along the traction groove 13 to tighten the flexible resistance strip 2, and adjust the flexible resistance strip 2 to be filled into the receiving square groove 11 from the lead-out notch 19.

[0067] S4. Press the guide post 33 into the entry position 151 of the positioning groove 15, the traction post 32 enters the adjustment groove 14, and the cover 31 abuts against the top surface of the housing 1.

[0068] S5. Inject refractory mortar into the receiving square groove 11 from the two grouting holes 16 on opposite sides of the shell 1 until the refractory mortar overflows from the other two grouting holes 16.

[0069] S6. Continue to push the cover 31 and the traction seat 4 so that the guide post 33 slides to the fixed position 152 of the positioning groove 15 to block the grouting hole 16;

[0070] S7. Inject epoxy resin into the lead-out notch 19 and the grouting hole 16 to encapsulate the cement resistor.

[0071] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high power cement resistor for a frequency converter, characterized in that The utility model relates to a flexible resistance strip tensioning device, including the casing (1) of the top opening has the accommodation square groove (11), install in the flexible resistance strip (2) of accommodation square groove (11), install the traction cover (3) of casing (1) top and install the traction seat (4) in the bottom of casing (1), the serpentine of the accommodation square groove (11) in setting up has the column team (12), the column team (12) includes a plurality of column row (121) and the support column (122) of connecting adjacent column row (121) head and tail, the support column (122) is located at the turning of column team (12), the support column (122) is by a plurality of interval arrangement's limiting column (1210) is composed, the flexible resistance strip (2) is abutted to one side of column team (12), the traction cover (3) includes cover body (31) and a plurality of setting in the traction column (32) of cover body (31) bottom, the traction column (32) is located in adjacent limiting column (1210) between each column row (121) and can move between adjacent limiting column (1210), the traction column (32) is abutted to flexible resistance strip (2) and is bent with adjacent limiting column (1210) cooperation and is tensioned flexible resistance strip (2), the accommodation square groove (11) is filled with fire clay;Adjacent the column row (121) is arranged in parallel, and the limiting column (1210) of each column row (121) is combined to form rectangular array;The bottom of the accommodation square groove (11) is through the setting and has a plurality of traction slot (13) corresponding to the traction column (32); The traction seat (4) is provided with the positioning hole (41) opposite the traction slot (13), the traction column (32) corresponds with the positioning hole (41) one to one and the end of traction column (32) is embedded in the positioning hole (41), the length of traction column (32) is greater than the sum of the depth of the accommodation square groove (11) and the depth of the traction slot (13), the length of traction column (32) is less than the sum of the depth of the accommodation square groove (11), the depth of the traction slot (13) and the depth of the positioning hole (41).

2. A high power cement resistor for frequency converters according to claim 1, characterized in that, The opposite two sides of the bottom of cover body (31) are provided with a row of guide columns (33), and the two rows of guide columns (33) are parallel to each other, and each row of guide columns (33) includes two guide columns (33) arranged at intervals, the top of the casing (1) is provided with a positioning groove (15) on the opposite two sides of the accommodation square groove (11), and each guide column (33) is embedded in a different positioning groove (15), and the depth of the positioning groove (15) is matched with the guide column (33).

3. A high power cement resistor for frequency converters according to claim 2, characterized in that, The width of the positioning groove (15) is matched with the guide column (33), the guide column (33) slides in the positioning groove (15) and is connected with the positioning groove (15), the grouting hole (16) is arranged on the outer wall of the casing (1), and the grouting hole (16) penetrates one end of the positioning groove (15) and communicates with the accommodation square groove (11).

4. A high power cement resistor for frequency converters according to claim 3, characterized in that, The number of the grouting holes (16) is four and they are evenly distributed on the two opposite outer walls of the shell (1), the two ends of the positioning groove (15) are respectively the entering position (151) and the fixing position (152), the entering position (151) is the initial position of the guide column (33) sliding into the positioning groove (15), and the grouting holes (16) all pass through the fixing position (152).

5. A high power cement resistor for frequency converters according to claim 4, characterized in that, The top of the shell (1) is provided with a first guide groove (17) on the opposite sides of the accommodating square groove (11) for embedding and sliding of the guide column (33), the two first guide grooves (17) are arranged in parallel, the positioning groove (15) is located in the first guide groove (17), and the depth of the first guide groove (17) is less than that of the positioning groove (15).

6. A high power cement resistor for frequency converters according to claim 5, characterized in that, The length of the traction column (32) is greater than or equal to the depth of the positioning groove (15) minus the depth of the first guide groove (17) plus the thickness of the shell (1).

7. A high power cement resistor for frequency converters according to claim 5, characterized in that, The top surface of the traction seat (4) is provided with a row of sliding columns (42) on the opposite sides, the two rows of sliding columns (42) are parallel to each other, and each row of sliding columns (42) includes two sliding columns (42) arranged at intervals, and the bottom of the shell (1) is provided with a second guide groove (18) on the opposite sides of the accommodating square groove (11) for embedding and sliding of the sliding column (42).

8. A high power cement resistor for frequency converters according to claim 7, characterized in that, The first guide groove (17) and the second guide groove (18) are square grooves, the guide column (33) and the sliding column (42) are square columns, the positioning groove (15) is a square groove, and the width of the positioning groove (15) is the same as that of the guide groove.

9. A high power cement resistor for frequency converters according to claim 1, characterized in that, The side surface of the shell (1) is provided with an exit notch (19) for leading out of the flexible resistance strip (2), and the exit notch (19) fixes the flexible resistance strip (2) by epoxy resin and encapsulates.

10. A method of processing a high power cement resistor for a frequency converter, characterized by The processing method for the high-power cement resistor as claimed in any one of claims 1-9 comprises the following steps: S1. The flexible resistance strip (2) is led through the exit notch (19), wound around the column team (12) and tensioned on one side of the column team (12); S2. The sliding column (42) is aligned with the second guide groove (18) and embedded, and the traction column (32) is aligned with the positioning hole (41) and embedded; S3. The shell (1) is fixed while the cover (31) and the traction seat (4) are pressed towards each other, the cover (31) and the traction seat (4) are pushed in the direction in which the first guide groove (17) is formed until the guide column (33) moves to the end of the first guide groove (17), the traction column (32) will be pushed along the traction groove (13) and flexibly tension the flexible resistance strip (2), and the flexible resistance strip (2) is adjusted to be supplemented into the accommodating square groove (11) from the exit notch (19); S4. The guide column (33) is pressed into the entering position (151) of the positioning groove (15), the traction column (32) enters the adjusting groove (14), and the cover (31) abuts against the top surface of the shell (1); S5. The refractory mortar is injected into the accommodating square groove (11) from the two grouting holes (16) on the opposite sides of the shell (1) until the refractory mortar overflows from the other two grouting holes (16). S6. Continue to push the cover (31) and the traction seat (4), so that the guide column (33) slides to the fixed position (152) of the positioning groove (15) to block the grouting hole (16); S7. Inject epoxy resin into the lead-out notch (19) and the grouting hole (16), thereby encapsulating the cement resistor.

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