A slow breaking and closing test device for a direct-acting circuit breaker

Abstract

The application relates to the technical field of gas-insulated metal-enclosed switchgear, in particular to a slow opening and slow closing testing device for a direct-acting circuit breaker. The testing device comprises a device frame and a force applying rod installed on the device frame, a driving mechanism for driving the force applying rod to translate is arranged on the device frame, the testing device further comprises a guide rod connecting piece for being connected with a guide rod of the circuit breaker, a tension and pressure sensor is connected between the guide rod connecting piece and the force applying rod, the guide rod of the circuit breaker is driven to move through the force applying rod, the tension and pressure sensor and the guide rod connecting piece to perform a slow opening and slow closing operation, and the tension and pressure in the slow opening and slow closing process are measured, so that the technical problem that the assembly quality of the direct-acting circuit breaker body cannot be detected and the overall assembly quality and service life of the direct-acting circuit breaker cannot be ensured due to the absence of a suitable slow opening and slow closing testing device for the direct-acting circuit breaker in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of gas-insulated metal-enclosed switchgear technology, specifically to a slow opening and closing test device for direct-acting circuit breakers. Background Technology

[0002] Existing circuit breakers include a circuit breaker body, a mechanism box, and an operating mechanism connected between the two, as follows: Figure 1 As shown, most existing circuit breakers are of the crank arm type, that is, the crank arm structure 14 is used as the operating mechanism. One end of the crank arm structure 14 is connected to the guide rod of the circuit breaker body 121, and the other end is connected to the mechanism box 13. The mechanism box 13 drives the crank arm structure 14, which in turn drives the circuit breaker body 12 to perform opening and closing operations. However, this type of crank arm circuit breaker has a relatively complex structure and high cost.

[0003] To address the aforementioned problems, existing technologies have been improved upon, and designs such as... Figure 2 The direct-acting circuit breaker shown has a direct-acting structure 15 connecting the circuit breaker body 12 and the mechanism box 13, which eliminates the need for the crank arm structure 14 of the original crank arm circuit breaker. The overall structure is simple, easy to operate, and can reduce costs.

[0004] After the circuit breaker body is assembled, its assembly quality needs to be inspected before connecting it to the operating mechanism and mechanism box. The assembly quality of the circuit breaker body is often inspected using a "slow opening and slow closing" method. This method utilizes the change in opening and closing force during the process to test the internal friction of the circuit breaker body, thus reflecting the assembly quality. Based on the opening and closing force values, a suitable mechanism box is matched to the circuit breaker body. Simultaneously, at the end of the "slow opening and slow closing" stroke, the position of the circuit breaker body guide rod during opening and closing can be determined, thus establishing the accurate relative installation position between the circuit breaker body and the mechanism box. This ensures that the mechanism box can accurately drive the circuit breaker body for opening and closing operations, avoiding excessive friction during the opening and closing process due to improper installation, which could affect the service life of the circuit breaker.

[0005] For cantilever circuit breakers, existing technologies utilize specialized testing fixtures to perform a "slow opening and closing + torque measurement" method to test the assembly quality of the circuit breaker body and determine the accurate installation position between the circuit breaker body and the mechanism box, ensuring the overall assembly quality of the circuit breaker body. However, the structure of direct-acting circuit breakers differs from that of cantilever circuit breakers, and they can only be tested using the "slow opening and closing + torque measurement" method. The specialized testing fixtures for cantilever circuit breakers cannot be directly applied to direct-acting circuit breakers. Therefore, it is necessary to design a slow opening and closing test device for direct-acting circuit breakers to detect the assembly quality of the direct-acting circuit breaker body and prevent a reduction in the service life of the direct-acting circuit breaker due to overall assembly quality issues. Summary of the Invention

[0006] The purpose of this invention is to provide a slow opening and slow closing test device for direct-acting circuit breakers, so as to solve the technical problem in the prior art that the lack of a suitable slow opening and slow closing test device for direct-acting circuit breakers makes it impossible to detect the assembly quality of the direct-acting circuit breaker body and to guarantee the overall assembly quality and service life of the direct-acting circuit breaker.

[0007] To achieve the above objectives, the technical solution of the direct-acting circuit breaker slow opening and slow closing test device of the present invention is as follows:

[0008] A slow opening and closing test device for a direct-acting circuit breaker includes a frame and a force-applying rod mounted on the frame. The frame is equipped with a drive mechanism for driving the force-applying rod to move. The test device also includes a guide rod connector for connecting to a circuit breaker guide rod. A tension and compression sensor is connected between the guide rod connector and the force-applying rod to move the circuit breaker guide rod to perform slow opening and closing operations and measure the tension and compression during the slow opening and closing process.

[0009] Beneficial Effects: This invention innovatively designs a slow-opening and slow-closing test device for direct-acting circuit breakers. This device utilizes a drive mechanism to move a force-applying rod, thereby guiding the guide rod of the direct-acting circuit breaker to complete the slow-opening and slow-closing operation of the circuit breaker body. During this process, on the one hand, tension and compression sensors can be used to test the opening and closing forces, detecting the assembly quality of the direct-acting circuit breaker body; on the other hand, the accurate opening and closing positions of the direct-acting circuit breaker body can be determined at the end of the slow-opening and slow-closing stroke, thus ensuring accurate assembly between the direct-acting circuit breaker body and the mechanism box, reducing assembly errors, improving the overall assembly quality of the direct-acting circuit breaker, and simultaneously reducing wear during use, thus extending its service life. In summary, the slow-opening and slow-closing test device for direct-acting circuit breakers of this invention solves the technical problems in the prior art where the lack of a suitable slow-opening and slow-closing test device for direct-acting circuit breakers prevents the detection of the assembly quality of the direct-acting circuit breaker body and the guarantee of the overall assembly quality and service life of the direct-acting circuit breaker.

[0010] Furthermore, a torque relief mechanism is connected between the force-applying rod and the tension / compression sensor or between the guide rod connector and the tension / compression sensor. The torque relief mechanism is used to relieve the torque generated when the force-applying rod and / or the circuit breaker guide rod rotates.

[0011] Beneficial effects: Through the above design, the torque relief structure ensures that the tension and compression sensors are subjected to force along the axial direction during the slow opening and closing process, avoiding the deformation of the tension and compression sensors caused by torque and thus preventing a decrease in measurement accuracy, thereby ensuring the accuracy of the measurement structure.

[0012] Furthermore, the torque unloading mechanism includes an unloading bearing, which includes an inner ring, an outer ring, and a roller disposed between the inner and outer rings. One of the force application rod and the tension / compression sensor is fixed relative to the outer ring of the unloading bearing, and the other is fixed relative to the inner ring of the unloading bearing. Alternatively, one of the guide rod connector and the tension / compression sensor is fixed relative to the outer ring of the unloading bearing, and the other is fixed relative to the inner ring of the unloading bearing.

[0013] Beneficial effects: Through the above design, the torque relief bearing can be used to separate the rotation between the tension / compression sensor and the force-applying rod or guide rod connector, so that the tension / compression sensor can rotate relative to the force-applying rod or guide rod connector, thereby realizing torque relief of the tension / compression sensor, ensuring that the tension / compression sensor is not affected by torque during the slow opening and closing process. At the same time, the torque relief bearing is used to realize torque relief of the tension / compression sensor, which is simple in structure and easy to operate.

[0014] Furthermore, the torque unloading mechanism is connected between the force-applying rod and the tension / compression sensor. The torque unloading mechanism also includes an unloading mechanism bearing housing and a fixed shaft connected to the end of the tension / compression sensor facing the force-applying rod. The fixed shaft has an annular protrusion on its outside. There are two unloading bearings, which are respectively mounted on both axial sides of the annular protrusion. The inner rings of the two unloading bearings are respectively interference-fitted with the fixed shaft and interference-fitted with the unloading mechanism bearing housing. The end of the force-applying rod has an outer flange that extends into the unloading mechanism bearing housing and is pressed against the outer ring of the unloading bearing by the bearing housing.

[0015] Beneficial effects: The above design incorporates two load-bearing bearings, with annular protrusions used to press and stop the inner rings of the two bearings respectively. This improves the axial force capacity of the testing device during slow opening and closing, enhancing the overall stability of the device. The end of the force-applying rod is provided with an outer flange and is pressed against the outer ring of the load-bearing bearing by the load-bearing mechanism bearing seat, which can fix the force-applying rod and the outer ring of the load-bearing bearing together, ensuring that the tension and pressure sensors and the force-applying rod can rotate relative to each other. At the same time, the overall structure is compact and easy to operate.

[0016] Furthermore, the force-applying rod is a screw, and the driving mechanism is a lead screw and nut mechanism. The driving mechanism includes a screw sleeve fixedly mounted on the device frame. The screw and the screw sleeve are threadedly connected so that the translation and rotation of the screw can be achieved by directly rotating the screw.

[0017] Beneficial effects: Through the above design, the drive mechanism is designed as a lead screw and nut mechanism, which uses the threaded engagement of the screw sleeve and the screw to realize the translation and rotation of the screw. On the one hand, the overall structure is compact and easy to implement and operate. On the other hand, it can accurately control the displacement of the screw to meet the requirements of slow opening and slow closing.

[0018] Furthermore, the testing device also includes a cassette and a connecting shaft connected to one end of the force-applying rod of the tension / compression sensor. The end of the connecting shaft is provided with a stop flange that extends into the cassette and is used to stop and cooperate with the inner wall of the cassette. The cassette has a movable space for the stop flange to move axially. The guide rod connector is installed on one side of the cassette opposite to the connecting shaft. The guide rod connector is provided with a threaded structure for threaded connection with the circuit breaker guide rod.

[0019] Beneficial effects: Through the above design, when the testing device is actually assembled with the direct-acting circuit breaker body, the tension and compression sensors do not need to be directly screwed onto the guide rod, avoiding wear on the external wiring of the tension and compression sensors due to rotation, which would reduce their service life. At the same time, it is not necessary to move the drive rod and screw the tension and compression sensors at the same time, which saves time and effort and is easy to operate.

[0020] Furthermore, the end of the guide rod connector facing the card seat is provided with a stop step that extends into the card seat and engages with the inner wall of the card seat.

[0021] Beneficial effects: The above design facilitates the installation of the guide rod connector and the card seat.

[0022] Furthermore, a lateral loading port is provided on the side wall of the card holder, and the stopping flange of the connecting shaft and the stopping step of the guide rod connector extend into the card holder from the lateral loading port to achieve stopping assembly with the card holder.

[0023] Beneficial effects: The above design facilitates the assembly of the card holder with the connecting shaft and guide rod connector by utilizing the side loading port.

[0024] Furthermore, the force-applying rod is a screw, and the driving mechanism is a lead screw and nut mechanism. The driving mechanism includes a screw sleeve rotatably mounted on the device frame and an anti-rotation structure fixedly mounted on the device frame and cooperating with the force-applying rod to prevent rotation, so as to realize the translation of the screw by rotating the screw sleeve.

[0025] Beneficial effects: Through the above design, the drive mechanism is designed as a lead screw and nut mechanism. At the same time, the anti-rotation structure can realize the translation of the screw. The overall structure is compact and easy to implement. On the other hand, the displacement of the screw can be accurately controlled to meet the requirements of slow opening and slow closing.

[0026] Furthermore, the device frame includes a support plate, a fixing plate, and at least two connecting columns connecting the support plate and the fixing plate. The support plate is provided with a fixing structure for fixing the support plate to the end face of the circuit breaker, and the support plate is provided with a clearance hole for avoiding the circuit breaker guide rod.

[0027] Beneficial effects: The above design facilitates the assembly of the testing device with the direct-acting circuit breaker body, making operation convenient. The clearance hole can avoid the guide rod and prevent interference. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the existing crank-arm circuit breaker, which connects the main body and the mechanism box via a crank-arm box.

[0029] Figure 2 This is a schematic diagram of the existing direct-acting circuit breaker connecting the main body and the mechanism box via a direct-acting structure;

[0030] Figure 3 This is a schematic diagram of the overall structure of a direct-acting circuit breaker slow opening and slow closing test device according to the present invention;

[0031] Figure 4 This is a partial cross-sectional view of a direct-acting circuit breaker slow opening and slow closing test device according to the present invention.

[0032] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 yes Figure 4 Enlarged view of point B in the middle;

[0034] Figure 7 This is a first-view schematic diagram of the assembly of a direct-acting circuit breaker slow opening and slow closing test device and the direct-acting circuit breaker body without the fixing clip installed.

[0035] Figure 8 This is a second-view schematic diagram of the assembly of a direct-acting circuit breaker slow opening and slow closing test device and the direct-acting circuit breaker body without the fixing clip installed.

[0036] Figure 9 This is a schematic diagram of the structure of the direct-acting circuit breaker slow opening and slow closing test device and the circuit breaker body after assembly according to the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Support plate; 2. Connecting column; 3. Force-applying rod; 4. Guide rod connector; 5. Card seat; 6. Fixing plate; 7. Drive mechanism; 71. Screw sleeve; 72. Fixing sleeve; 73. Locking nut; 74. Rotary handle; 75. Drive bearing; 76. Drive bearing seat; 77. Guide block; 8. Tension / compression sensor; 9. Torque unloading mechanism; 91. Unloading mechanism bearing seat; 92. Unloading bearing; 10. Fixed shaft; 11. Connecting shaft; 12. Direct-acting circuit breaker body; 121. Circuit breaker guide rod; 13. Mechanism box; 14. Crank arm structure; 15. Direct-acting structure. Detailed Implementation

[0039] The direct-acting circuit breaker slow opening and slow closing test device of the present invention uses a drive mechanism to drive the force rod to move linearly along the axial direction, thereby enabling the direct-acting circuit breaker body to complete the slow opening and slow closing operation. During the slow opening and slow closing process, on the one hand, the opening and closing force values ​​can be tested using tension and compression sensors to detect the assembly quality of the direct-acting circuit breaker body. On the other hand, the accurate opening and closing positions of the direct-acting circuit breaker body can be obtained at the end of the slow opening and slow closing stroke, thereby ensuring the accurate assembly between the direct-acting circuit breaker body and the mechanism box, reducing assembly errors, and improving the service life of the direct-acting circuit breaker.

[0040] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0041] Specific embodiment 1 of the direct-acting circuit breaker slow opening and slow closing test device provided by the present invention:

[0042] like Figure 3 , 4 As shown, the direct-acting circuit breaker slow opening and slow closing test device (hereinafter referred to as the test device) of the present invention includes a device frame, a force-applying rod 3 mounted on the device frame, and a drive mechanism 7 for driving the force-applying rod 3 to translate. The test device also includes a guide rod connector 4 for connecting to the circuit breaker guide rod 121. A tension and pressure sensor 8 is connected between the guide rod connector 4 and the force-applying rod 3, so as to drive the circuit breaker guide rod 121 to move through the force-applying rod 3, the tension and pressure sensor 8 and the guide rod connector 4 to perform slow opening and slow closing operations and measure the tension and pressure during the slow opening and slow closing process.

[0043] Among them, such as Figure 4 As shown, the device frame includes a support plate 1, a fixing plate 6, and at least two connecting posts 2 connecting the support plate 1 and the fixing plate 6. The support plate 1 is provided with a fixing structure for fixing the support plate 1 to the end face of the circuit breaker. In this embodiment, the fixing structure is a fixing hole provided on the support plate 1. The support plate is fixed to the circuit breaker body through the fixing hole and bolts. The support plate 1 is also provided with a clearance hole for avoiding the circuit breaker guide rod 121. In this embodiment, the number of connecting posts 2 is three. In other embodiments, the number of connecting posts 2 can be set according to actual needs, such as 2, 5, 6, etc. In other embodiments, the fixing structure can be a strong magnet provided on the support plate 1.

[0044] In this embodiment, the force-applying rod 3 is a screw, and the driving mechanism 7 is a lead screw and nut mechanism. The driving mechanism 7 includes a screw sleeve 71 rotatably mounted on the device frame and an anti-rotation structure fixedly mounted on the device frame and cooperating with the force-applying rod 3 to prevent rotation, so as to realize the translation of the screw by rotating the screw sleeve 71.

[0045] like Figure 4 , 5As shown, specifically, the screw sleeve 71 is located at the end of the fixed plate 6 facing away from the support plate 1. The screw sleeve 71 also has a stepped surface facing away from the fixed plate 6. A fixed sleeve 72 is threadedly connected to the screw sleeve 71, and a rotating handle 74 is fixedly installed on the fixed sleeve 72. A locking nut 73 is threadedly connected to the screw sleeve 71 at the end of the fixed sleeve 72 facing away from the stepped surface. The locking nut 73 is used to lock the fixed sleeve 72 and the screw sleeve 71 together, thereby fixing the fixed sleeve 72 and the screw sleeve 71. This design separates the screw sleeve 71, the fixed sleeve 72, and the rotating handle 74, making it easy to install, remove, and replace. At the same time, the rotating handle 74 makes it easy to rotate the screw sleeve 71.

[0046] A drive bearing housing 76 is provided on the side of the threaded sleeve 71 facing the fixed plate 6. The end of the drive bearing housing 76 facing the fixed plate 6 has an outwardly extending flange. The drive bearing housing 76 is fixedly mounted on the fixed plate 6 via the flange and bolt assemblies. A drive bearing 75 is provided between the fixed plate 6 and the threaded sleeve 71. The drive bearing 75 includes an inner ring, an outer ring, and a rotor disposed between the inner and outer rings. Specifically, an annular protrusion is provided on the side of the threaded sleeve 71 facing away from the fixed sleeve 72. There are two drive bearings 75, each disposed on the annular protrusion. On both axial sides of the annular protrusion, the inner rings of the two drive bearings 75 are interference-fitted with the threaded sleeve 71, and the opposite ends of the two inner rings are respectively abutted on the axial sides of the annular protrusion of the threaded sleeve 71. The outer rings of the two drive bearings 75 are interference-fitted with the drive bearing housing 76, and the outer rings of the drive bearings 75 facing the fixed plate 6 are abutted on the fixed plate 6, while the outer rings of the drive bearings 75 facing away from the fixed plate 6 are abutted on the end face of the drive bearing housing 76. The fixed plate 6 and the drive bearing housing 76 can axially stop the outer rings of the two drive bearings 75. In other embodiments, when the axial force is small, the number of drive bearings 75 can be one.

[0047] Furthermore, in this embodiment, an opening for avoiding the threaded sleeve 71 is provided on the end face of the drive bearing seat 76 facing away from the fixed plate 6. The stepped surface of the threaded sleeve 71 is located inside the drive bearing seat 76. This arrangement makes the overall structure of the drive mechanism 7 more compact. On the other hand, by placing the stepped surface inside the drive bearing seat 76, the drive bearing seat 76 can protect the stepped surface of the threaded sleeve 71 and the connection position between the fixed sleeve 72, thereby improving the stability of the test device.

[0048] In this embodiment, the force-applying rod 3 is threadedly engaged with the screw sleeve 71, and the force-applying rod 3 is coaxially arranged with the circuit breaker guide rod 121 of the direct-acting circuit breaker body 12. A long groove extending along the bearing is arranged on the circumferential surface of the force-applying rod 3. A guide block 77 adapted to the long groove is fixedly installed at the end of the fixing plate 6 facing away from the screw sleeve 71. The guide block 77 and the long groove constitute an anti-rotation structure to prevent the force-applying rod 3 from rotating. Thus, when the rotating handle 74 is rotated, the screw sleeve 71 can drive the force-applying rod 3 to translate axially.

[0049] like Figure 4 , 6 As shown, in this embodiment, a torque unloading mechanism 9 is connected between the force-applying rod 3 and the tension / compression sensor 8. The torque unloading mechanism 9 can unload the torque generated when the force-applying rod 3 or the circuit breaker guide rod 121 rotates, ensuring that the tension / compression sensor 8 measures accurately during the slow opening and closing process.

[0050] Specifically, such as Figure 6 As shown, the torque unloading mechanism 9 includes an unloading mechanism bearing seat 91. A fixed shaft 10 is connected to one end of the tension / compression sensor 8 facing the force application rod 3. An unloading bearing 92 is arranged between the fixed shaft 10 and the unloading mechanism bearing seat 91. Each unloading bearing 92 includes an inner ring, an outer ring, and a roller arranged between the inner ring and the outer ring. In this embodiment, the fixed shaft 10 has an annular protrusion on its exterior. There are two unloading bearings 92. The inner rings of the two unloading bearings 92 are respectively press-fitted with the fixed shaft 10, and the two inner rings are respectively abutted on the axial sides of the annular protrusion. The outer rings are press-fitted with the unloading mechanism bearing seat 91. The end of the force-applying rod 3 has an outer flange that extends into the unloading mechanism bearing seat 91 and is pressed against the outer ring of the unloading bearing 92 by the bearing seat. The outer ring of the unloading bearing 92 facing away from the force-applying rod 3 is blocked by the bearing seat. In this way, the unloading bearing seat 92 is used to block the outer rings of the two unloading bearings 92, and the annular protrusion of the fixed shaft 10 is used to block the inner rings of the two unloading bearings 92, thereby improving the axial force capacity of the anti-torsion unloading mechanism and improving the stability of the device.

[0051] Simultaneously, the above-mentioned configuration allows for the fixed installation of the force-applying rod 3 and the outer ring of the unloading bearing 92, as well as the fixed installation of the tension / compression sensor 8 and the inner ring of the unloading bearing 92. This ensures that the tension / compression sensor 8 and the force-applying rod 3 can always rotate relative to each other, preventing the force-applying rod 3 from rotating slightly during the initial operation of the test device or the switching motion due to the clearance between the long groove of the force-applying rod 3 and the guide block 77. This avoids torsional deformation of the tension / compression sensor 8, thus achieving torque relief for the tension / compression sensor 8. This ensures that the tension / compression sensor 8 is not affected by torque during slow opening and closing, preventing a decrease in measurement accuracy due to radial force on the tension / compression sensor 8 caused by torque, and ensuring the accuracy of the measurement structure. Furthermore, the torque relief of the tension / compression sensor 8 achieved by the unloading bearing 92 is simple in structure and easy to operate. On the other hand, if the circuit breaker guide rod 121 experiences slight oscillation or rotation during the measurement process, the anti-torsion relief device can also prevent torsional deformation of the tension / compression sensor 8, improving measurement accuracy.

[0052] like Figure 6 As shown, in this embodiment, the bearing housing 91 of the unloading mechanism consists of two parts, which are fixedly assembled together by bolt assembly, which facilitates assembly.

[0053] In this embodiment, both the drive bearing 75 and the unloading bearing 92 are tapered roller bearings. The two drive bearings 75 are installed face-to-face in the drive bearing housing 76 and the two unloading bearings 92 are installed face-to-face in the unloading mechanism bearing housing 91. This arrangement allows the tapered roller bearings to withstand greater axial force, ensuring the stability of the press-fitting process and improving the practicality and reliability of the measuring device. In other embodiments, the drive bearing 75 and / or the unloading bearing 92 can also be thrust bearings.

[0054] like Figure 4As shown, in this embodiment, the testing device further includes a mounting base 5 and a connecting shaft 11 connected to one end of the force-applying rod 3 of the tension / compression sensor 8. The end of the connecting shaft 11 has a stop flange extending into the mounting base 5 and used for a stop-fitting engagement with the inner wall of the mounting base 5. A guide rod connector 4 is installed on the side of the mounting base 5 facing away from the connecting shaft 11, and the end of the guide rod connector 4 facing the mounting base 5 has a stop step extending into the mounting base 5 and used for a stop-fitting engagement with the inner wall of the mounting base 5. A lateral loading port is provided on the side wall of the mounting base 5. The stop flange of the connecting shaft 11 and the stop step of the guide rod connector 4 extend into the mounting base 5 from the lateral loading port to achieve a stop-fitting assembly with the mounting base 5. Simultaneously, the mounting base 5 has a space for the stop flange and the stop step to move axially. The end of the guide rod connector 4 facing away from the mounting base 5 has a threaded structure for a threaded connection with the circuit breaker guide rod 121. In other embodiments, the guide rod connector 4 is machined with a countersunk hole for fitting the circuit breaker guide rod 121. A pin hole is provided on the side wall of the countersunk hole, and a pin is assembled in the pin hole. The circuit breaker guide rod 121 and the guide rod connector 4 are fixedly connected by the pin.

[0055] With this configuration, when the testing device is actually assembled with the direct-acting circuit breaker body 12, the tension and compression sensor 8 does not need to rotate, avoiding wear on the external wiring of the tension and compression sensor 8 caused by rotation, thus reducing its service life. At the same time, it eliminates the need to simultaneously move the drive rod and screw the guide rod connector 4, saving time and effort and making operation easier. Furthermore, the side mounting port facilitates the assembly of the mounting bracket 5 with the connecting shaft 11 and the guide rod connector 4.

[0056] The slow opening and slow closing test device for direct-acting circuit breakers of the present invention performs the following slow opening and slow closing operation process:

[0057] like Figure 7-9 As shown, both the direct-acting circuit breaker body 12 and the testing device are placed horizontally. First, the support plate 1 is fixed to the end face of the direct-acting circuit breaker body 12, and the circuit breaker guide rod 121 is passed through the corresponding through hole on the support plate 1. The guide rod connector 4 is threaded onto the guide rod 121. Then, the rotating handle 74 is rotated, and the force bar 3 moves closer to the guide rod connector 4 under the action of the screw sleeve 71 and the guide block 77. When the stop flange of the connecting shaft 11 and the stop step on the guide rod connector 4 are close enough to engage with the card holder 5, the side inlet of the card holder 5 is turned downwards, and the stop flange and the stop step are stopped inside the card holder 5. This prevents the card holder 5 from falling off. This completes the assembly of the testing device and the direct-acting circuit breaker body 12.

[0058] During the slow-opening operation, rotating the handle 74 causes the drive rod to move away from the circuit breaker body under the action of the screw sleeve 71. After the second fixed shaft 10 is stopped on the retaining seat 5, the retaining seat 5 moves the guide rod connector 4, which in turn moves the circuit breaker guide rod 121. The circuit breaker guide rod 121 then drives the direct-acting circuit breaker body 12 to open. Throughout the opening process, the tension and compression sensor 8 is used to measure the opening force value in real time to reflect the assembly quality of the direct-acting circuit breaker body 12. After the opening is completed, the opening position of the circuit breaker guide rod 121 is recorded to prepare for the accurate assembly of the subsequent direct-acting circuit breaker and the mechanism box 13.

[0059] During slow closing, the handle 74 is rotated in the reverse direction, causing the drive rod to approach the circuit breaker body under the action of the screw sleeve 71. At this time, the connecting shaft 11 moves closer to the guide rod connector 4. When the connecting shaft 11 contacts the guide rod connector 4, it pushes the circuit breaker guide rod 121 to perform the closing operation. Throughout the closing process, the tension and compression sensor 8 is used to measure the closing force value in real time, thereby reflecting the assembly quality of the direct-acting circuit breaker body 12. After closing, the closing position of the circuit breaker guide rod 121 is recorded to prepare for the accurate assembly of the subsequent direct-acting circuit breaker and the mechanism box 13.

[0060] After performing slow opening and closing operations on the direct-acting circuit breaker body 12 using a measuring device, the measurement data can reflect the assembly quality of the direct-acting circuit breaker body 12. On the other hand, based on the measured opening and closing force values, the appropriate mechanism box 13 can be accurately matched to the direct-acting circuit breaker body 12, thereby ensuring the efficient operation of the entire direct-acting circuit breaker. By using the measured opening and closing positions of the circuit breaker guide rod 121, the accurate assembly position between the direct-acting circuit breaker body 12 and the mechanism box 13 can be accurately calculated, ensuring that the mechanism box 13 can drive the direct-acting circuit breaker to perform reliable and low-wear opening and closing operations, thereby improving the service life of the entire direct-acting circuit breaker.

[0061] The above-mentioned operation process can be applied not only to existing direct-acting circuit breakers to detect the assembly quality of the existing direct-acting circuit breaker body 12 and ensure accurate assembly between the direct-acting circuit breaker and the mechanism box 13, but also to new direct-acting circuit breakers to collect the opening and closing force values ​​of the new direct-acting circuit breaker body 12 and compare them with the design data to detect the design quality, which facilitates the design of the new circuit breaker body. At the same time, by using multi-sample collection, the data can be aggregated to form a standard, laying the foundation for subsequent batch design.

[0062] In summary, the direct-acting circuit breaker slow-opening and slow-closing test device of the present invention utilizes the cooperation of the screw sleeve 71 and the guide block 77 to drive the drive rod to move linearly along the axial direction, which can realize the slow-opening and slow-closing operation of the direct-acting circuit breaker body 12. It can accurately determine the opening and closing positions of the direct-acting circuit breaker body 12, thereby ensuring accurate assembly between the direct-acting circuit breaker body 12 and the mechanism box 13, reducing assembly errors, reducing wear during use, and improving service life. The tensile and compressive sensors 8 can be used to test the opening and closing process of the direct-acting circuit breaker body 12 during the slow-opening and slow-closing process driven by the test device. The force value is used to detect the assembly quality of the direct-acting circuit breaker body 12, ensuring the factory quality. At the same time, the torque unloading mechanism 9 can avoid the torque generated by the radial force on the tension and compression sensor 8 due to the slight rotation of the drive rod or the slight rotation of the circuit breaker guide rod 121, which would affect the test results. This improves the testing accuracy of the tension and compression sensor 8 and ensures the test quality. This solves the technical problem in the prior art that the assembly quality of the direct-acting circuit breaker body 12 cannot be detected due to the lack of a suitable slow opening and slow closing test device for direct-acting circuit breakers, and the overall assembly quality and service life of the direct-acting circuit breaker cannot be guaranteed.

[0063] Embodiment 2 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different device frame. In Embodiment 1, the device frame consists of a support plate, a fixing plate and a connecting column. In this embodiment, the device frame is a box structure consisting of a base and a housing fixed on the fixing seat. An opening is provided on the side of the housing to lead out the external wiring of the tension and compression sensor and to realize the assembly of the card holder.

[0064] Embodiment 3 of the slow opening and closing test device for direct-acting circuit breakers of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different driving mechanism. In Embodiment 1, the force-applying rod is a screw, and the driving mechanism is a lead screw and nut mechanism. The driving mechanism includes a screw sleeve rotatably mounted on the device frame and an anti-rotation structure fixedly mounted on the device frame and cooperating with the force-applying rod to prevent rotation, so as to realize the translation of the screw by rotating the screw sleeve. In this embodiment, the force-applying rod is a rack structure, and the driving mechanism consists of a gear meshing with the rack and a driving gear motor. The power device drives the gear to drive the rack to translate in order to realize the slow opening and closing operation of the direct-acting circuit breaker body.

[0065] Embodiment 4 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different card holder structure. In Embodiment 1, a lateral loading port is provided on the side wall of the card holder. In this embodiment, the card holder includes a cylinder and end caps provided at both ends of the cylinder. The end caps are provided with through holes for the connecting shaft and the guide rod connector to pass through. During installation, the stop flange of the connecting shaft and the stop step of the guide rod connector are first inserted into the cylinder. Then, the end caps are fixed at both ends of the cylinder, and the end caps are used to stop the stop flange and the stop step.

[0066] Embodiment 5 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different card holder and guide rod connector. In Embodiment 1, the end of the guide rod connector facing the card holder is provided with a stop step that extends into the card holder and cooperates with the inner wall of the card holder. In this embodiment, the guide rod connector is directly fixed on the end face of the card holder facing the end of the guide rod connector.

[0067] Embodiment 6 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a test device with a different structure. In Embodiment 1, the test device also includes a card holder, a connecting shaft connected to one end of the force-applying rod of the tension / compression sensor, and a guide rod connector is installed on one side of the card holder facing away from the connecting shaft. The end of the guide rod connector facing away from the card holder is used to be screwed onto the guide rod. In this embodiment, the end of the tension / compression sensor facing away from the force-applying rod is directly connected to the guide rod connector. At this time, during installation, it is necessary to move the drive rod while screwing the guide rod connector onto the guide rod, and it is necessary to avoid wear and damage to the external wiring of the tension / compression sensor during rotation.

[0068] Embodiment 7 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different driving mechanism. In this embodiment, the force-applying rod is a screw, and the driving mechanism is a lead screw and nut mechanism. The driving mechanism includes a screw sleeve fixedly mounted on the device frame. The screw and the screw sleeve are threadedly connected so that the translation and rotation of the screw can be achieved by directly rotating the screw. At this time, the torque unloading mechanism can avoid the tension and pressure sensors from being torsional deformed during the slow opening and slow closing process.

[0069] Example 8 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this example and example 1 is that this example provides a different unloading bearing. In example 1, there are two unloading bearings. In this example, when the axial force is small and the test device is to be operated normally, only one unloading bearing can be set.

[0070] Embodiment 9 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different way of fixing the force-applying rod and the outer ring of the unloading bearing. In Embodiment 1, the end of the force-applying rod is provided with an outer flange that extends into the bearing seat of the unloading mechanism and is pressed against the outer ring of the unloading bearing by the bearing seat. In this way, the force-applying rod and the outer ring of the unloading bearing are fixed by the bearing seat of the unloading mechanism and the outer flange. In this embodiment, the end of the force-applying rod facing the tension and pressure sensor is directly fixedly installed on the bearing seat of the unloading mechanism, thereby fixing the force-applying rod and the outer ring of the unloading bearing.

[0071] Example 10 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this example and Example 1 is that this example provides a different torque unloading mechanism. In Example 1, the force-applying rod is fixed to the outer ring of the unloading bearing, and the tension / compression sensor is relatively fixed to the inner ring of the unloading bearing. In this example, the force-applying rod is assembled with the inner ring of the unloading bearing to achieve relative fixation of the inner ring of the force-applying rod. The end of the fixed shaft facing the force-applying rod is directly fixed on the bearing seat of the unloading mechanism to achieve relative fixation of the tension / compression sensor and the outer ring of the unloading bearing.

[0072] Embodiment 11 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different torque unloading mechanism. In Embodiment 1, the torque unloading mechanism includes an unloading bearing. In this embodiment, an outer conical surface facing away from the tension and pressure sensor is provided on the outer flange of the force-applying rod. A retainer is provided between the tension and pressure sensor and the drive rod. The end of the tension and pressure sensor facing the drive rod is directly fixed on the retainer. The end of the retainer that cooperates with the force-applying rod is provided with an inner conical surface for cooperating with the outer conical surface of the outer flange. The outer flange of the force-applying rod extends into the inside of the retainer and cooperates with the inner conical surface. In this way, the force-applying rod and the retainer can rotate relative to each other using the conical surface, avoiding the tension and pressure sensor from being twisted.

[0073] Embodiment 12 of the direct-acting circuit breaker slow opening and slow closing test device of the present invention: The difference between this embodiment and Embodiment 1 is that this embodiment provides a different test device. In Embodiment 1, a torque unloading mechanism is connected between the force rod and the tension / compression sensor. In this embodiment, a torque unloading mechanism is no longer connected between the force rod and the tension / compression sensor. By precision machining the long groove of the force rod and the guide block, the gap between the two is controlled within the torsional accuracy of the tension / compression sensor itself.

[0074] In the above embodiments, the torque unloading mechanism is disposed between the tension / compression sensor and the drive rod. In other embodiments, the torque unloading mechanism can also be disposed between the tension / compression sensor and the guide rod connector. The specific arrangement is the same as in the above embodiments, and will not be described again here.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A test device for slow opening and slow closing of a direct-acting circuit breaker, characterized in that, The testing device includes a frame and a force-applying rod (3) mounted on the frame. The frame is equipped with a drive mechanism (7) for driving the force-applying rod (3) to translate. The testing device also includes a guide rod connector (4) for connecting to the circuit breaker guide rod (121). A tension / compression sensor (8) is connected between the guide rod connector (4) and the force-applying rod (3) to drive the circuit breaker guide rod (121) to move through the force-applying rod (3), the tension / compression sensor (8), and the guide rod connector (4) to perform slow opening and closing operations and measure the tension and compression during the slow opening and closing process. A torque is connected between the force-applying rod (3) and the tension / compression sensor (8) or between the guide rod connector (4) and the tension / compression sensor (8). The torque unloading mechanism (9) is used to unload the torque generated when the force-applying rod (3) or / and the circuit breaker guide rod (121) rotates; the torque unloading mechanism (9) includes an unloading bearing (92), which includes an inner ring, an outer ring and a roller disposed between the inner and outer rings, one of the force-applying rod (3) and the tension / compression sensor (8) is fixed relative to the outer ring of the unloading bearing (92) and the other is fixed relative to the inner ring of the unloading bearing (92), or one of the guide rod connector (4) and the tension / compression sensor (8) is fixed relative to the outer ring of the unloading bearing (92) and the other is fixed relative to the inner ring of the unloading bearing (92).

2. The slow opening and slow closing test device for a direct-acting circuit breaker according to claim 1, characterized in that, The torque unloading mechanism (9) is connected between the force-applying rod (3) and the tension / compression sensor (8). The torque unloading mechanism (9) also includes an unloading mechanism bearing seat (91) and a fixed shaft (10) connected to the tension / compression sensor (8) at one end facing the force-applying rod (3). The fixed shaft (10) has an annular protrusion on its outside. There are two unloading bearings (92) and they are respectively mounted on the axial sides of the annular protrusion. The inner rings of the two unloading bearings (92) are respectively press-fitted with the fixed shaft (10) and the outer rings are press-fitted with the unloading mechanism bearing seat (91). The end of the force-applying rod (3) is provided with an outer flange that extends into the unloading mechanism bearing seat (91) and is pressed by the unloading mechanism bearing seat (91) onto the outer ring of the unloading bearing (92).

3. The slow opening and slow closing test device for a direct-acting circuit breaker according to any one of claims 1-2, characterized in that, The force-applying rod (3) is a screw, and the drive mechanism (7) is a lead screw and nut mechanism. The drive mechanism (7) includes a screw sleeve (71) fixedly mounted on the device frame. The screw and the screw sleeve (71) are threadedly connected so that the translation and rotation of the screw can be achieved by directly rotating the screw.

4. The slow opening and slow closing test device for a direct-acting circuit breaker according to any one of claims 1-2, characterized in that, The testing device also includes a card holder (5) and a connecting shaft (11) connected to one end of the back-applying force rod (3) of the tension and compression sensor (8). The end of the connecting shaft (11) is provided with a stop flange that extends into the card holder (5) and is used to stop and cooperate with the inner wall of the card holder (5). The card holder (5) has a movable space for the stop flange to move axially. The guide rod connector (4) is installed on one side of the card holder (5) away from the connecting shaft (11). The guide rod connector (4) is provided with a threaded structure for threaded connection with the circuit breaker guide rod (121).

5. The slow opening and slow closing test device for a direct-acting circuit breaker according to claim 4, characterized in that, The guide rod connector (4) has a stop step at one end facing the card seat (5) that extends into the card seat (5) and engages with the inner wall of the card seat (5).

6. The slow opening and slow closing test device for a direct-acting circuit breaker according to claim 5, characterized in that, The side wall of the card holder (5) is provided with a lateral loading port. The stop flange of the connecting shaft (11) and the stop step of the guide rod connector (4) extend into the card holder (5) from the lateral loading port to achieve stop assembly with the card holder (5).

7. The slow opening and slow closing test device for a direct-acting circuit breaker according to any one of claims 1-2, characterized in that, The force-applying rod (3) is a screw, and the drive mechanism (7) is a lead screw and nut mechanism. The drive mechanism (7) includes a screw sleeve (71) rotatably mounted on the device frame and an anti-rotation structure fixedly mounted on the device frame and cooperating with the force-applying rod (3) to prevent rotation, so as to realize the translation of the screw by rotating the screw sleeve (71).

8. The slow opening and slow closing test device for a direct-acting circuit breaker according to any one of claims 1-2, characterized in that, The device frame includes a support plate (1), a fixing plate (6) and at least two connecting columns (2) connecting the support plate (1) and the fixing plate (6). The support plate (1) is provided with a fixing structure for fixing the support plate (1) to the end face of the circuit breaker, and the support plate (1) is provided with a clearance hole for avoiding the circuit breaker guide rod (121).

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